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  • 201.
    Olsson, Par A. T.
    et al.
    Malmo Univ, SWE.
    Hyldgaard, Per
    Chalmers Univ Technol, SWE.
    Schroder, Elsebeth
    Chalmers Univ Technol, SWE.
    Jutemar, Elin Persson
    Tetra Pak, SWE.
    Andreasson, Eskil
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för maskinteknik.
    Kroon, Martin
    Linnaeus Univ, SWE.
    Ab initio investigation of monoclinic phase stability and martensitic transformation in crystalline polyethylene2018Inngår i: PHYSICAL REVIEW MATERIALS, ISSN 2475-9953, Vol. 2, nr 7, artikkel-id 075602Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    We study the phase stability and martensitic transformation of orthorhombic and monoclimic polyethylene by means of density functional theory using the nonempirical consistent-exchange vdW-DF-cx functional [Phys. Rev. B 89, 035412 (2014)]. The results show that the orthorhombic phase is the most stable of the two. Owing to the occurrence of soft librational phonon modes, the monoclimic phase is predicted not to be stable at zero pressure and temperature, but becomes stable when subjected to compressive transverse deformations that pin the chains and prevent them from wiggling freely. This theoretical characterization, or prediction, is consistent with the fact that the monoclimic phase is only observed experimentally when the material is subjected to mechanical loading. Also, the estimated threshold energy for the combination of lattice deformation associated with the T1 and T2 transformation paths (between the orthorhombic and monoclimic phases) and chain shuffling is found to be sufficiently low for thermally activated back transformations to occur. Thus, our prediction is that the crystalline part can transform back from the monoclimc to the orthorhombic phase upon unloading and/or annealing, which is consistent with experimental observations. Finally, we observe how a combination of such phase transformations can lead to a fold-plane reorientation from {110} to {100} type in a single orthorhombic crystal.

  • 202.
    Olsson, Pär A.T.
    et al.
    Malmö högskola, SWE.
    Schröder, Elsebeth
    Chalmers University of Technology, SWE.
    Hyldgaard, Per
    Malmö högskola, SWE.
    Kroon, Martin
    Linnaeus University, SWE.
    Andreasson, Eskil
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för maskinteknik.
    Bergvall, Erik
    Tetra Pak AB, SWE.
    Ab initio and classical atomistic modelling of structure and defects in crystalline orthorhombic polyethylene: Twin boundaries, slip interfaces, and nature of barriers2017Inngår i: Polymer, ISSN 0032-3861, E-ISSN 1873-2291, Vol. 121, s. 234-246Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    We study the stability of twin boundaries and slip in crystalline orthorhombic polyethylene by means of density functional theory (DFT), using a nonempirical, truly nonlocal density function, and by means of classical molecular dynamics (MD). The results show that, in accordance with experimental observations, there is a clear preference to chain slip over transverse slip for all considered slip planes. The activation energy for pure chain slip lies in the range 10–20 mJ/m2 while that for transverse slip corresponds to 40–280 mJ/m2. For the (11¯0)-slip plane the energy landscape is non-convex with multiple potential energy minima, indicating the presence of stable stacking faults. This suggests that dissociation of perfect dislocations into partials may occur. For the two low-energy twin boundaries considered in this work, {110} and {310}, we find that the former is more stable than the latter, with ground state energies corresponding to 8.9 and 28 mJ/m2, respectively. We have also evaluated how well the empirical MD simulations with the all-atom optimized potential for liquid MD simulations (OPLS-AA) and the coarse-grained united atom (UA) potential concur with the DFT results. It is found that an all-atom potential is necessary to partially capture the γ-surface energy landscapes obtained from the DFT calculations. The OPLS-AA predicts chain slip activation energies comparable with DFT data, while the transverse slip energy thresholds are low in comparison, which is attributed to weak close ranged monomer repulsion. Finally, we find that the H-H interaction dominates the slip activation. While not explicitly represented in the UA potential, its key role is revealed by correlating the DFT energy landscape with changes in the electron distributions and by MD simulations in which components of the OPLS-AA intermolecular potential are selectively silenced. © 2017 Elsevier Ltd

  • 203.
    Olsson, Pär
    et al.
    Malmö högskola, SWE.
    in ’t Veld, Pieter J.
    BASF SE, Polymer Physics, DEU.
    Andreasson, Eskil
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för maskinteknik.
    Bergvall, Erik
    Tetra Pak AB, SWE.
    Persson Jutemar, Elin
    Tetra Pak AB, SWE.
    Petersson, Viktor
    Tetra Pak AB, SWE.
    Rutledge, Gregory Charles
    Massachusetts Institute of Technology, USA.
    Kroon, Martin
    Linnéuniversitetet, SWE.
    All-atomic and coarse-grained molecular dynamics investigation of deformation in semi-crystalline lamellar polyethylene2018Inngår i: Polymer, ISSN 0032-3861, E-ISSN 1873-2291, Vol. 153, s. 305-316Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    In the present work we have performed classical molecular dynamics modelling to investigate the effects of different types of force-fields on the stress-strain and yielding behaviours in semi-crystalline lamellar stacked linear polyethylene. To this end, specifically the all-atomic optimized potential for liquid simulations (OPLS-AA) and the coarse-grained united-atom (UA) force-fields are used to simulate the yielding and tensile behaviour for the lamellar separation mode. Despite that the considered samples and their topologies are identical for both approaches, the results show that they predict widely different stress-strain and yielding behaviours. For all UA simulations we obtain oscillating stress-strain curves accompanied by repetitive chain transport to the amorphous region, along with substantial chain slip and crystal reorientation. For the OPLS-AA modelling primarily cavitation formation is observed, with small amounts of chain slip to reorient the crystal such that the chains align in the tensile direction. This force-field dependence is rooted in the lack of explicit H-H and C-H repulsion in the UA approach, which gives rise to underestimated ideal critical resolved shear stress. The computed critical resolved shear stress for the OPLS-AA approach is in good agreement with density functional theory calculations and the yielding mechanisms resemble those of the lamellar separation mode. The disparate energy and shear stress barriers for chain slip of the different models can be interpreted as differently predicted intrinsic activation rates for the mechanism, which ultimately are responsible for the observed diverse responses of the two modelling approaches. © 2018 Elsevier Ltd

  • 204.
    Pan, Nan
    et al.
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för maskinteknik.
    Kan, L.
    Kunming University of Science and Technology, CHI.
    Liu, Y.
    Kunming SNLab Tech Co., CHI.
    Fu, W.
    Xiangyang Public Security Department Wuhan Railway Public Security Bureau, CHI.
    Hou, Z.
    Criminal Investigation Department of Railway Public Security Bureau, CHI.
    Li, G.
    Shijiazhuang Public Security Bureau, CHI.
    Qian, J.
    Kunming University of Science and Technology, CHI.
    Fu, X.
    Kunming University of Science and Technology, CHI.
    Nonlinear tool traces fast tracing algorithm based on single point laser detection2019Inngår i: Journal of Intelligent & Fuzzy Systems, ISSN 1064-1246, E-ISSN 1875-8967, Vol. 36, nr 2, s. 1109-1120Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    There are lots of line traces on the surface of the broken ends which left in the cable cutting case crime scene along the high-speed railway in China. The line traces usually present nonlinear morphological features and has strong randomness. It is not very effective when using existing image-processing and three-dimensional scanning methods to do the trace comparison, therefore, a fast algorithm based on wavelet domain feature aiming at the nonlinear line traces is put forward to make fast trace analysis and infer the criminal tools. The proposed algorithm first applies wavelet decomposition to the 1-D signals which picked up by single point laser displacement sensor to partially reduce noises. After that, the dynamic time warping is employed to do trace feature similarity matching. Finally, using linear regression machine learning algorithm based on gradient descent method to do constant iteration. The experiment results of cutting line traces sample data comparison demonstrate the accuracy and reliability of the proposed algorithm. © 2019 - IOS Press and the authors. All rights reserved

  • 205.
    Panarotto, Massimo
    et al.
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för maskinteknik.
    Bertoni, Marco
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för maskinteknik.
    Bertoni, Alessandro
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för maskinteknik.
    Experimenting the use of value models as boundary objects in conceptual PSS design2016Inngår i: PRODUCT-SERVICE SYSTEMS ACROSS LIFE CYCLE / [ed] Cavalieri, S; Ceretti, E; Tolio, T; Pezzotta, G, Elsevier, 2016, Vol. 47, s. 370-375Konferansepaper (Fagfellevurdert)
    Abstract [en]

    The paper presents the results of experimental activities aiming at investigating the role of ‘value models’ as ‘boundary objects’ that facilitate cross-functional discussions in the PSS conceptual design phase. The experiment featured 6 separate sessions involving a total of 22 students in the final year of three different Master Programmes. In the sessions participants were asked to redesign an asphalt compactor and to use different types of design decision support for this task, namely value models vs. requirements checklists. The recordings from the experiment were analysed using protocol analysis to compare the behaviour of teams. The results confirm the hypothesis that, compared to traditional requirement checklists, value models emphasizes activities related to the clarification (1) of the problem domain and needs and (2) of the lifecycle aspects of a solution concept. Both results suggest that value models have the ability to facilitate cross-boundary discussion in the early phases of the PSS design process, and to act as boundary objects that provide a common platform for knowledge sharing within the cross-functional team.

  • 206.
    Panarotto, Massimo
    et al.
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för maskinteknik.
    Wall, Johan
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för maskinteknik.
    Bertoni, Marco
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för maskinteknik.
    Larsson, Tobias
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för maskinteknik.
    Jonsson, Pontus
    Dynapac Compaction Equipment AB, SWE.
    Value-driven simulation: thinking together through simulation in early engineering design2017Inngår i: DS87-4 PROCEEDINGS OF THE 21ST INTERNATIONAL CONFERENCE ON ENGINEERING DESIGN (ICED 17), VOL 4: DESIGN METHODS AND TOOLS / [ed] Kim H.,Fadel G.,Skec S.,Van der Loos M.,Salustri F.,Oehmen J.,Maier A.M.,Kokkolaras M., The Design Society, 2017, Vol. 4, s. 513-522, artikkel-id DS87-4Konferansepaper (Fagfellevurdert)
    Abstract [en]

    The topic of ‘design for value’ has lately attracted a great deal of attention within the engineering design community. ‘Predicting’ the value of a future solution is however difficult, especially in early design phases. Modelling and simulation is believed to be able to support this challenging task.

    A simulation process for value-driven engineering design is presented. The performances of a design concept along the lifecycle are aggregated to a monetary system value function. The results of this multi-model simulation environment for value are displayed through a colour-coded CAD model for easier interaction.

    Verification activities indicate that enabling effective design space exploration and visualization of cause-effect relationships become important elements in order to ‘think together’ using a simulation driven design approach. Furthermore, the proposed multidisciplinary ‘value model’ fosters cross-functional knowledge sharing and collective deliberation about the value, forcing stakeholders to synthetize their perceptions about the value of a design and to discuss where conclusions differ.

  • 207. Parida, Vinit
    et al.
    Johansson, Christian
    Luleå University of Technology.
    Larsson, Tobias
    Luleå University of Technology.
    Implementation of open innovation practices in Swedish manufacturing industry2009Konferansepaper (Fagfellevurdert)
    Abstract [en]

    The notion of open innovation has quickly gained interest of both practitioners and researches. However, there is a lack on studies on this research topic. Thus, the main purpose of the study is to get a deeper understanding of how can large firms can implement open innovation practices. This purpose will be achieved by first, understanding the current innovation process and second, focus on critical aspects such as, partners, capabilities, and role of SMEs which can be important for implementing open innovation practices. The study is based on qualitative data from two companies from Swedish manufacturing industry. The results show that both companies don’t fully practice open innovation approach. Moreover, partnering with customers and universities are highly preferred compared to having suppliers involved in the development process. The ability to absorb external knowledge and gain from inter-firm relationships were vital for effective open innovation practices. Finally, role of SMEs in the open innovation practices large firms was not clearly visible.

  • 208. Parida, Vinit
    et al.
    Larsson, Tobias
    Luleå University of Technology.
    Isaksson, Ola
    Oghazi, Pejvak
    Towards open innovation practices in aerospace industry2011Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Across industrial settings and environmental conditions, innovation is viewed as a source of advancing firms’ competitive position. Recently, a shift has been witnessed from the traditional innovation model, which mainly focused on internal research and development (R&D) towards open innovation. In this study, we have attempted to study if this approach is suitable for the regular, more mature industry by focusing the context of aerospace industry. The study involves a single case company that is a developer and manufacturer of components for both civil and military aero engines as well as for rocket engines. In addition to previous findings we would like to propose three key areas, which need special attention by any company aiming to successfully realize open innovation. These areas are people, process and technology, put into a framework. The PPT framework was found to be particularly helpful regarding the organizational changes needed for open innovation.

  • 209.
    Parimi, Venkata Naga Sai Krishna Janardhan
    et al.
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för maskinteknik.
    Eluri, Vamsi
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för maskinteknik.
    Stress Analysis of Different Shaped Holes on a Packaging Material2016Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    In packaging industries, the demand for usage of Low Density Poly Ethylene foil is of profound interest. In the past, research was carried out on finite and infinite plates with varying crack lengths but having constant crack width. In this thesis, a detailed analysis on crack initiation is carried out on finite plates by varying width of the hole. The hole shapes for stress analysis include circle, ellipse and rectangular notch. Initially, maximum stress is found out using Linear Elastic Fracture Mechanics (LEFM) theory and compared with Finite element method (FEM) results. Secondly using Elastic Plastic Fracture Mechanics theory (EPFM), critical stress and geometric function are evaluated theoretically by Modified Strip Yield Model (MSYM) and numerically by ABAQUS. Finally, a tensile test is conducted to validate the theoretical and numerical results.  By varying the width of the hole, a study on the parameters like critical stress, geometric function is presented. A conclusion is drawn that the effect of hole width should be considered when calculating fracture parameters. 

  • 210.
    Pedrera Busselo, Asier
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för maskinteknik.
    Bike rider heating. Market research and two new concepts.2016Independent thesis Basic level (degree of Bachelor), 10 poäng / 15 hpOppgave
  • 211.
    Persson, Andreas
    et al.
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för maskinteknik.
    Holmberg, Daniel
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för maskinteknik.
    How to create affordable and sustainable facilitites for companies2016Independent thesis Advanced level (degree of Master (Two Years)), 300 hpOppgave
    Abstract [en]

    Summary

    Kruthusen Företagsfastigheter AB is a company that rent industrial facilities, mainly to smaller companies and startup companies. Most of their facilities today are already rented which creates the opportunity to expand and build new facilities. The problem is that the building methods and materials commonly used today will require a rent that is unaffordable for these companies. Therefore a new way of creating these facilities is needed to be able to reduce costs, to allow a lower rent. 

    In the current facilities big costs are connected with companies’ changing facilities which often require reconstruction or similar. Some needs extra bathrooms, other need a kitchen and a few do not need any of it. Therefore, to save a lot of money on reconstruction a common area will be built where there will be a dressing room with showers, WC and a kitchen.

    There are many different ways to save energy which also reduces costs. Research has been made to see if there are other alternatives to heat the building. District heating is available in the area where the new facility will be built. District heating is considered a sustainable choice and therefore was selected. Heat losses for the new building were calculated to estimate if it is enough to target operational costs to be able to secure a low rent. The result was that a high amount of the heat losses can be reduced but it is not enough to allow affordable rents. The total cost of the building could not be estimated by us. This is the reason why other measures like common areas cannot be proven to lower the rent to the targeted value. If the concept is affordable will be known when the concept is sent to a construction company for cost estimation.

    The final building will include a common area in the middle connected with the entrance and 10 industrial facilities for renting that will be 8x13 square meters. To make it easier for the customers a parking lot will be built in front of the building. On the back side every company will have an area for their work-related vehicles. Also a spot for containers will be included for extra storage for each renting company.

  • 212.
    Persson, David
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för industriell ekonomi.
    Låssystem: En analys av marknaden och dess aktörer i Karlskrona kommun2014Oppgave
    Abstract [sv]

    iLOQ är ett företag som håller på att revolutionera låsbranschen genom att erbjuda marknaden ett digitalt låssystem som inte behöver batterier eller kablar. Deras vision är att bli marknadsledande inom den självverkande digitala låsbranschen, där de ska åstadkomma revolutionerande kundnyttor. iLOQs framgång bygger på tre punkter: alla nycklar är mekaniskt identiska, både cylindern och nyckeln ska vara elektroniska samt att cylindern ska alstra sin egen energi. För att fortsätta expandera behöver de identifiera och penetrera nya marknader. Genom intervjuer och datasökning har både en marknads- och en konkurrentanalys gjorts. Marknadsanalysen har bland annat besvarat hur stor låsmarknaden i Karlskrona kommun är samt hur ansvaret gällande lås och nycklar ser ut inom kommunen. I konkurrentanalysen har iLOQs konkurrenter identifierats samt konkurrentens responsprofil tagits fram. Resultatet från marknadsanalys visar bland annat att marknaden för lås i Karlskrona kommun, år 2013 uppgick till över 1,3 miljoner SEK. 270.000 SEK av dessa kostnader hade kunnat undvikas om kommunen istället använt sig av iLOQs låssystem. Detta då iLOQs system inte kräver batterier, kablar, nyckelskåp eller omläggning. Konkurrentanalysen visar att den största konkurrenten och aktören i Karlskrona kommun är ASSA som har en svaghet i att de är så pass stora som de är, vilket gör de oflexibla när det kommer till kampanjer. Slutsatsen är att det för iLOQ finns potential att i framtiden lyckas penetrera marknaden i Karlskrona kommun då resultaten pekar på att det finns besparingar att göra samt att iLOQs låssystem är den produkt som uppfyller kommunens kriterium bäst. Innan dess måste iLOQ bli godkända av SIS samt se till att Creab AB blir en av deras partners. Nyckelord: iLOQ, Lås, Nycklar, ASSA, Elektromekaniska lås, Karlskrona kommun.

  • 213.
    Petersson, Andreas
    Blekinge Tekniska Högskola, Sektionen för ingenjörsvetenskap.
    Förbättring av innovationsarbetet hos Vida Packaging2013Oppgave
    Abstract [sv]

    Vida Packaging is one of Sweden’s biggest packaging companies, the main products are pallets, pallet collars and cable drums. At the five modern factories and because of the company size big volumes and short lead times are possible, but even customized products are available maid from the requests from the customers. Thanks to these products it’s possible to transport large quantities in a fast and smooth way with all of the usual transportations. The packaging industry is a mature industry, not much development has been done in the different product segments. This is because of a lot of aggravating factors in the industry like standardization of the products which aggravate the innovation process. However Vida Packaging has noticed big advantages with innovation when they have developed a new product which has been well received from the market. The purpose with this report is there by to investigate the possibility of innovation in this kind of business and investigate the possibilities of improvement on the innovation process at Vida Packaging. By mapping out how the innovation process is done today, you got a starting point which you move on the look at different methods which have proven successful for other companies and methods that have proven successful from different research. These then have to be evaluated from the perspective of the company the get methods that works even for this kind of company to get a plan which is customized for Vida Packaging.

  • 214.
    Pettersson, Viktor
    et al.
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för maskinteknik.
    Jangenäs, Alexander
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för maskinteknik.
    FRAMTIDENS FREKVENSOMRIKTARE: PRODUKTJÄMFÖRELSE OCH KONCEPTUTVECKLING2017Independent thesis Advanced level (degree of Master (Two Years)), 300 hpOppgave
  • 215.
    Pilthammar, Johan
    et al.
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för maskinteknik.
    Sigvant, Mats
    Volvo Cars, SWE.
    Kao-Walter, Sharon
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för maskinteknik.
    Including die and press deformations in sheet metal forming simulations2016Inngår i: NUMISHEET 2016: 10TH INTERNATIONAL CONFERENCE AND WORKSHOP ON NUMERICAL SIMULATION OF 3D SHEET METAL FORMING PROCESSES, PTS A AND B / [ed] Cardoso, RPR Yoon, JW Dick, RE Neto, ES DeSa, JMAC Adetoro, OB, IOP PUBLISHING LTD , 2016, artikkel-id UNSP 032036Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Structural analysis, in Abaqus, of a stamping die and subsequent morphing of the tool surfaces in AutoForm were performed to improve a sheet metal forming simulation. First, the tool surfaces of the XC90 rear door inner were scanned. They were not matching when the die was unloaded and could therefore not give any satisfying results in sheet metal forming simulations. Scanned surface geometries were then added to a structural FE-model of the complete stamping die and some influential parts of the production press. The structural FE-model was analysed with Abaqus to obtain the structural deformations of the die. The calculated surface shapes were then transferred to AutoForm where a forming simulation was performed. Results from the different sheet metal forming simulations were compared to measured draw in curves and showed a substantial increase in accuracy and ability to analyse dies in running production when the morphed surfaces were used.

  • 216.
    Podowski, Camilla
    et al.
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för industriell ekonomi.
    Sundin, Malin
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för industriell ekonomi.
    Navigating the labyrinth: The path to progression for senior female managers working in a foreign country2014Independent thesis Advanced level (degree of Master (One Year))Oppgave
    Abstract [en]

    Many articles have been written about women and what kind of barriers they face – whether it being a glass ceiling or a labyrinth - as they are progressing in their careers; gender stereotyping, double-binds, lack of role models, “old boys club”, different leadership styles, and so forth. And many others have talked about how to navigate or mitigate any obstacles that might face women due to their gender. Purpose of Research: This report aims to give insight into another aspect of this topic, namely through the lens of a cultural standpoint: do women that live and work abroad face yet another obstacle by being foreigners in addition to the gender specific ones that previously have been thoroughly identified in academic research. Research Question: How do successful female managers overcome attitudinal and cultural barriers in a foreign country? What strategies have they used? Method: The main research data was collected through in-depth, semi-structured, qualitative Skype interviews with women who have chosen to work and live abroad on a local level (i.e. not expats on time limited assignments). The collected empirical data was subsequently analysed using a matrix containing key words obtained from an in-depth, two-level academic literature search. The key words supported the discussion of the empirical findings and the analysis where the barriers were identified together with the subsequent strategies these women have used in order to progress their careers. Conclusions: As the study shows, a majority of the interviewed women have experienced positive response due to them being from a foreign culture, allowing them additional lee-way in making decisions that is considered to be non-stereotypical or norm “because-she-is-not-from-around-here” or using – very consciously – the excuse “this-is-the-way-we-do-it-in-my-home-country” to overcome attitudinal [gender] barriers. Most interviewed women also acknowledge that being a woman – in a male dominated environment such as a higher management position – differentiates them from the “crowd”, and it can be utilized as an advantage – providing that you want to stand in the spotlight. A common thread among the interviewed women was that women themselves are their own worst enemies – they often create their own internal barriers that prevent them from advancing their careers. However, the higher the women climb on the corporate ladder, the less advantage they have from being a foreigner and a woman, and the more they have to conform to the “norm” that in many places still is an “old boys club”.

  • 217.
    Pulicherla, Yashpal Surendhar Goud
    et al.
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för maskinteknik.
    Kesana, Ramkiran
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för maskinteknik.
    Experimental and Numerical Study of Orthotropic Materials2017Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    In current enterprises, simulations are being utilized to lessen the cost of product advancement.  Along this line, there is an awesome enthusiasm for enhancing precision and accuracy of simulations. For an accurate and reliable simulation, it is essential to use an accurate material model and provide it with accurate material information. In exhibit industries, orthotropic materials are being simulated utilizing isotropic material model, as orthotropic material model requires more material data which is not promptly accessible. This proposal intends to test and identify orthotropic materials and simulate them using orthotropic material model in ABAQUS. Materials utilized as a part of this proposal are Aluminium, LDPE, PET. Required material data was gotten by performing Uni-directional tensile tests, DIC, and an algorithm we developed in light of Inverses method. To get highly accurate material data from DIC, a few kinds of patterns were examined, and a superior pattern was resolved for camera configuration being utilized.

  • 218.
    R Lacno, Jeronimo
    Blekinge Tekniska Högskola. Höganäs AB.
    Förbättrad korrosionmetod för Höganäs AB lödningslegeringar2017Independent thesis Basic level (degree of Bachelor), 12 poäng / 18 hpOppgave
    Abstract [sv]

    Denna rapport sammanfattar och jämför två olika korrosionmetoder, Höganäs interna korrosionstest och korrosions test enligt VDA 230-214. Målet har varit att med dessa två tester som bakgrund, ta fram en ny metod som löser Höganäs problem med upprepbarhet. Genom att med noggrant utförande gått igenom processen för hårdlödning, beredning av syror, korrosionsprovning under 4 veckor och processen för undersökning av mikrostrukturen på lödningsfogen, så har man lyckats få ut ett kvantitativt resultat.

    Förbättringen av den interna korrosionsmetoden valdes att basera sig enbart på svavelsyran och samtidigt istället att bereda syralösningar genom att styra pH värdet mellan ett aggresivt och ett mindre aggresivt värde. Man valde också att jämföra två produkter som ska hålla samma korrosionsegenskaper, Brazelet F300 och Brazelet Ni613. Produkten F300 är utvecklade av Höganäs AB och skillnaden gentemot den licensierade produkten Ni613 är att F300 innehåller järn och mindre nickel. Tidigare utredningar har gjorts för att jämföra dessa produkterna men har visat olika resultat.

    Denna utredning har lett till en metod för att kvantifiera korrosionsmotståndet hos de olika loden istället för att bara visuellt bedöma om korrosionsmotståndet är bra eller dåligt. Denna metoden har även lett till framtida arbeten för utvärdering av andra syror.

  • 219.
    Ramström, Victor
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för industriell ekonomi.
    Förstudie och design av simuleringssystem för automatisk kreditgivningsprocess2014Oppgave
    Abstract [sv]

    Arbetet har genomförts i samarbete med Amfa Bank vars primära produkt är fakturaköp utan regress. Sedan 2006 har banken ett automatiskt attesteringssystem med möjlighet att, delvis eller helt, godkänna krediter i samband med fakturaköp utan ingripande från kredithandläggare. På grund av ett strikt uppsatt internt regelverk som attesteringssystemet följer kan endast en del av de fakturor som ankommer till banken attesteras automatiskt. Det finns en hög tilltro hos bankens ledning till attesteringssystemets förmåga att fatta säkra kreditbeslut men få förändringar har genomförts i systemet sedan implementationen på grund av osäkerhet kring vilket utfall förändringar kan väntas få. Detta examensarbete syftar till att genomföra en förstudie där möjligheten till simulering av attesteringssystemet undersöks samt skapa ett implementationsförslag för ett sådant system. Metoden som använts i denna studie har varit av explorativ karaktär. Detta inbegriper processbeskrivningar över företagets verksamhet relaterat till fakturaflödet, en omfattande dokumentation av processerna och funktionerna i det automatiska attesteringssystemet samt utformandet av ett implementationsförslag för ett simuleringssystem. Undersökningen visade att den automatiska attesteringsprocessen kan simuleras med rimliga utvecklingsinsatser genom tillämpa logiska delar från det befintliga attesteringssystemet. Undersökningen visade också att stora mängder komplett faktura-, kredit- och reskontradata finns tillgängligt vilket ger gediget simuleringsunderlag och hög reliabilitet i simuleringsresultatet. Rapporten och dess bilagor kan av banken användas som underlag för att implementera ett simuleringssystem. Resultatet från framtida simuleringar kommer ge ett omfattande men tydligt beslutsunderlag som kan användas för att optimera företagets automatiska attesteringssystem med förkortade ledtider och kostnadsbesparingar som följd.

  • 220.
    Reheman, Wureguli
    et al.
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för maskinteknik.
    Ståhle, Per
    Lund university, SWE.
    On the role of anisotropic expansion and yield stress on crack tip precipitates2019Inngår i: Theoretical and applied fracture mechanics (Print), ISSN 0167-8442, E-ISSN 1872-7638, Vol. 103, artikkel-id 102290Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    This pilot study uses a Landau-Lifshitz phase field model to study the growth of a precipitate originating from a crack tip. A boundary layer giving a remote square root singular elastic stress field is applied. The materials are assumed to be elastic-plastic with linear strain hardening. The precipitate is assumed to expand in a simplified anisotropic manner, meaning that the hydride is assumed to grow with an orientation giving maximum expansion perpendicular to the crack plane. The results show that the anisotropic expansion has a strong effect on the shape of the hydride. For anisotropic materials the hydride becomes wedge like. The resulting shapes for the anisotropic cases are in line with observations of internal crack tip hydrides in zirconium. The shapes resemble earlier results for Einstein-Smoluchowski stress driven diffusion using discrete models and simplified modelling of the growth process. The crack tip shielding caused by both precipitation and plastic yielding is examined using the J integral. It shows that the near tip value is a around a quarter of its remote value for elastic isotropic materials and around a half for anisotropic materials. © 2019 Elsevier Ltd

  • 221.
    Reheman, Wureguli
    et al.
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för maskinteknik.
    Ståhle, Per
    Lunds universitet, SWE.
    Self-inflicted fracture of expanding surface precipitates2018Inngår i: Fatigue & Fracture of Engineering Materials & Structures, ISSN 8756-758X, E-ISSN 1460-2695, Vol. 41, nr 12, s. 2614-2628Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    This work concerns spontaneous fracture of growing brittle precipitates in an elastic plastic matrix. The mass of the precipitate is increasing as more transformed matrix material is added to it. Under stress-free conditions, the new phase occupies a larger volume than the original matrix material. Just outside the expanding precipitate, the matrix undergoes stretching beyond the elastic limit. The influence of the elastic plastic material behaviour is studied. A phase field model that keeps track of the phase composition is used. Both cases with a crack and without a crack are included. The growth histories from microscopic to macroscopic precipitate sizes are followed. Growth of the precipitate is very slow and quasi-static mechanical equilibrium is assumed at all time. The result is compared with observations of hydride blisters that are formed on surfaces of zirconium alloys. The numerical model is qualified against a derived exact solution for a cylindrical precipitate without a crack. The numerical result predicts a position of the growing crack that is confirmed by the observations. Also, the predicted length of the crack is in fair agreement with the experimental observations. The depth of the blister is slightly larger than what is found at the experiments. Also, it is found that the incorporated transformed phase rejects the compression, which creates an increasing tensile stress in the inner part of the precipitate. © 2018 Wiley Publishing Ltd.

  • 222.
    Reheman, Wureguli
    et al.
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för maskinteknik.
    Ståhle, Per
    Lunds universitet, SWE.
    Andreasson, Eskil
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för maskinteknik.
    Kao-Walter, Sharon
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för maskinteknik.
    NUMERICAL ANALYSIS OF ANISOTROPIC STIFFNESS OF THIN AL FOIL IN MULTIPLE MATERIAL DIRECTIONS BASED ON EXPERIMENTS2017Inngår i: NSCM30 - the 30th Nordic Seminar on Computational Mechanics: Proceedings / [ed] Jan Høgsberg and Niels L. Pedersen, 2017, s. 175-178Konferansepaper (Fagfellevurdert)
  • 223.
    Reheman, Wureguli
    et al.
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för maskinteknik.
    Ståhle, Per
    Lund Univ, SWE.
    Singh, Ram N.
    Bhabha Atom Res Ctr, IND.
    Fisk, Martin
    Malmo Univ, SWE.
    Stable and unstable growth of crack tip precipitates2018Inngår i: ECF22 - LOADING AND ENVIRONMENTAL EFFECTS ON STRUCTURAL INTEGRITY / [ed] Sedmak, A Radakovic, Z Rakin, M, ELSEVIER SCIENCE BV , 2018, s. 1792-1797Konferansepaper (Fagfellevurdert)
    Abstract [en]

    A model is established that describes stress driven diffusion, resulting in formation and growth of an expanded precipitate at the tip of a crack. The new phase is transversely isotropic. A finite element method is used and the results are compared with a simplified analytical theory. A stress criterium for formation of the precipitate is derived by direct integration of the Einstein-Smoluchowski law for stress driven diffusion. Thus, the conventional critical concentration criterium for precipitate growth can be replaced with a critical hydrostatic stress. The problem has only one length scale and as a consequence the precipitate grows under self-similar conditions. The length scale is given by the stress intensity factor, the diffusion coefficient and critical stress versus remote ambient concentrations. The free parameters involved are the expansion strain, the degree of anisotropy and Poisson's ratio. Solutions are obtained for a variation of the first two. The key result is that there is a critical phase expansion strain below which the growth of the new phase is stable and controlled by the stress intensity factor. For supercritical expansion strains, the precipitate grows even without remote load. The anisotropy of the expansion strongly affects the shape of the precipitate, but does not have a large effect on the crack tip shielding. (C) 2018 The Authors. Published by Elsevier B.V.

  • 224. Ritzén, Sofia
    et al.
    Larsson, Tobias
    Luleå Tekniska Universitet.
    Nilsson, Fredrik
    Regnell, Björn
    MINT – Mätinspiration i innovativa team2010Inngår i: Management of Technology, Vol. 17, nr 3, s. 7-9Artikkel i tidsskrift (Annet (populærvitenskap, debatt, mm))
  • 225.
    Rondini, Alice
    et al.
    University of Bergamo, ITA.
    Bertoni, Marco
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för maskinteknik.
    Pezzotta, Giuditta
    University of Bergamo, ITA.
    An IPA based method for PSS design concept assessment2017Inngår i: Procedia CIRP / [ed] McAloone, TC; Pigosso, DCA; Mortensen, NH; Shimomura, Y, Elsevier, 2017, Vol. 64, s. 277-282Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Literature and field study research highlight that transiting toward PSS means for many companies to either miss interesting business opportunities or to bet on the wrong solution concept. Early stage assessment activities play a crucial role in this respect, guiding the selection of a value-adding PSS while preventing commitment of resources on poor design alternatives. Emerging from empirical studies in the manufacturing industry, the paper highlights the need for systematic procedures, tools and metrics able to encompass customer satisfaction together with the producer’s value perspective in such assessment. The paper proposes a 2 step assessment method based on the Importance Performance Analysis (IPA) matrix enabling the integration of customer and provider value and supporting early stage PSS design decision making. Verification activities highlight the positive implications of balancing the trade-off between customer and provider value during the PSS assessment phase.

  • 226.
    Rondini, Alice
    et al.
    Universita degli Studi di Bergamo, ITA.
    Bertoni, Marco
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för maskinteknik.
    Pezzotta, Giuditta
    Universita degli Studi di Bergamo, ITA.
    At the origins of Product Service Systems: Supporting the concept assessment with the Engineering Value Assessment method2018Inngår i: CIRP - Journal of Manufacturing Science and Technology, ISSN 1755-5817, E-ISSN 1878-0016Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    In recent years, the economic circumstances spur many companies in changing their traditional product-oriented value proposition toward a more customised and sustainable offer referred as Product-Service Systems (PSS). The main advantages of the new solutions are related to their customisation which can grant an improved customer experience. However, while pursuing greater differentiation from competitors and ‘locking-in’ customers and ‘locking-out’ competitors, many of the above-cited companies either miss interesting business opportunities or bet on the wrong solution concept. Early stage engineering phase plays a crucial role concerning the subsequent lifecycle phases, guiding the identification and the selection of valuable solutions while preventing commitment of resources on poor design alternatives. In the light of the criticality of this phase, this paper builds on empirical studies in the manufacturing industry and highlights the need for systematic procedures, methods and metrics able to encompass customer satisfaction together with the producer's value perspective during the early design assessment. The outcome of the paper is the Engineering Value Assessment (EVA) method. It is a 2 step procedure composed of multi-criteria decision-making methods with specific criteria for a comprehensive value assessment of PSS from both the customers’ and the provider's perspectives. The EVA also guides the identification of trade-off between the two through the Importance-Performance Analysis. Verification activities in the power and automation industry highlight the main benefits and the implications of the EVA method in guiding the decision making in the early stages of design and in balancing the trade-off between customer and provider value during the PSS assessment phase. Further developments and improvements are also discussed. © 2018 CIRP

  • 227.
    Rondini, Alice
    et al.
    University of Bergamo, ITA.
    Matschewsky, Johannes
    Linköping University, SWE.
    Pezzotta, Giuditta
    University of Bergamo, ITA.
    Bertoni, Marco
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för maskinteknik.
    A simplified approach towards customer and provider value in PSS for small and medium-sized enterprises2018Inngår i: 10th CIRP Conference on Industrial Product-Service Systems, IPS2 2018, 29-31 May 2018, Linköping, Sweden / [ed] Tomohiko Sakao, Mattias Lindahl, Yang Liu, Carl Dalhammar, Elsevier, 2018, Vol. 73, s. 61-66Konferansepaper (Fagfellevurdert)
    Abstract [en]

    While the provision of PSS is becoming more and more common, the transition toward a servitized business model is still critical. This is particularly true for small and medium-sized enterprises (SMEs) due to their limited internal resources and ability to define a servitization strategy. A crucial aspect during this transition is the identification of the right solutions to be implemented into the business that must render high value capture for providers and create value for customers. While a literature review showed that a large number of evaluation methods are available, these are often complex and require substantial amounts of resources in order to be carried out. This paper aims at supporting companies in taking decisions during early design phases by proposing a method that combines two existing approaches: The EVA method and the ProVa method. The combined method simplifies the existing ones while aiming at an easy implementation and application in SMEs. It is composed of two steps, the first pursuing the identification of valuable concepts from both the customer and the provider perspective; the second pursuing an individual analysis of the components available for use in the concepts selected. The application of the simplified method in a student-case of a startup company seeking to enter the distributed mobility market highlights the ease of use of the method in rendering valuable PSS concepts and in evaluating its specific components. 

  • 228.
    Rudenko, Oleg
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för maskinteknik.
    «exotic» models of high-intensity wave physics: Linearizing equations, exactly solvable problems and non-analytic nonlinearities2018Inngår i: Izvestiya Vysshikh Uchebnykh Zavedeniy. Prikladnaya Nelineynaya Dinamika, ISSN 0869-6632, Vol. 26, nr 3, s. 7-34Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Topic and aim. A brief review of publications and discussion of some mathematical models are presented, which, in the author's opinion, are well-known only to a few specialists. These models are not well studied, despite their universality and practical significance. Since the results were published at different times and in different journals, it is useful to summarize them in one article. The goal is to form a general idea of the subject for the readers and to interest them with mathematical, physical or applied details described in the cited references. Investigated models. Higher-order dissipative models are discussed. Precisely linearizable equations containing nonanalytic nonlinearities -quadratically-cubic (QC) and modular (M) -are considered. Equations like Burgers, KdV, KZ, Ostrovsky-Vakhnenko, inhomogeneous and nonlinear integro-differential equations are analyzed. Results. The appearance of dissipative oscillations near the shock front is explained. The formation in the QC-medium of compression and rarefaction shocks, which are stable only for certain parameters of the «jump», as well as the formation of periodic trapezoidal sawtooth waves and self-similar N-pulse signals are described. Collisions of single pulses in the M-medium are discussed, revealing new corpuscular properties (mutual absorption and annihilation). Collisions are similar to inter-actions of clusters of chemically reacting substances, for example, fuel and oxidizer. The features of the behavior of «modular» solitons are described. The phenomenon of nonlinear wave resonance in media with QC-, Q-and M-nonlinearities is studied. Precisely linearizable inhomogeneous equations with external sources are used. The shift of maximum of resonance curves relative to the linear position, which is determined by the equality of velocities of freely propagating and forced waves, is indicated. Simplified models for diffracting beams obtained by projecting 3D equations onto the beam axis are analyzed. Strongly nonlinear waves in systems with holonomic constraints are discussed. Integro-differential equations with relaxation type kernel, and the possibility of reducing them to differential and differential-difference equations are considered. Discussion. The material is outlined on a popular level. Apparently, these studies can be continued if the readers find them interesting enough. © 2018 Saratov State University. All rights reserved.

  • 229.
    Rudenko, Oleg
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för maskinteknik.
    Inhomogeneous Burgers Equation with Modular Nonlinearity: Excitation and Evolution of High-Intensity Waves2017Inngår i: Doklady. Mathematics, ISSN 1064-5624, E-ISSN 1531-8362, Vol. 95, nr 3, s. 291-294Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Solutions to an inhomogeneous partial differential equation of the second-order like Burgers equation are derived. Instead of the common quadratically nonlinear term, this equation contains the term with modular nonlinearity. This model describes the excitation of elastic waves in dissipative media differently reacting to tensile and compressive stresses. The equation is linear for the functions, preserving the sign. Nonlinear effects are manifested only to alternating functions. The solution for the periodic signal is found. The processes of generation of fundamental and higher harmonics are studied. The stationary wave profile is constructed. For one special kind of right-hand-side of the "modular" equation the solution in the form of S-wave is pointed out which is a bipolar single pulse.

  • 230.
    Rudenko, Oleg
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för maskinteknik. Moscow MV Lomonosov State Univ, Phys Fac, Moscow 119991, Russia.;Russian Acad Sci, Prokhorov Gen Phys Inst, Moscow, Russia.;Russian Acad Sci, Schmidt Inst Phys Earth, Moscow, Russia.;Blekinge Inst Technol, Karlskrona, Sweden..
    Wave Excitation in a Dissipative Medium with a Double Quadratically-Modular Nonlinearity: a Generalization of the Inhomogeneous Burgers Equation2018Inngår i: Doklady. Mathematics, ISSN 1064-5624, E-ISSN 1531-8362, Vol. 97, nr 3, s. 279-282Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Solutions of a forced (inhomogeneous) partial differential equation of the second order with two types of nonlinearity: power (quadratic) and nonanalytic (modular) are found. Equations containing each of these nonlinearities separately were studied earlier. A natural continuation of these studies is the development of the theory of wave phenomena in a medium with a double nonlinearity, which have recently been observed in experiments. Here solutions describing the profiles of intense waves are derived. Shapes of freely propagating stationary perturbations in the form of shock waves with a finite front width are found. The profiles of forced waves excited by external sources are calculated.

  • 231.
    Rudenko, Oleg
    et al.
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för maskinteknik. Moscow MV Lomonosov State Univ, Phys Fac, Moscow 119991, Russia.;Nizhnii Novgorod State Univ, Radiophys Fac, Nizhn Novgorod, Russia.;Russian Acad Sci, Prokhorov Gen Phys Inst, Moscow, Russia.;Russian Acad Sci, Schmidt Inst Phys Earth, Moscow, Russia.;Blekinge Inst Technol, Karlskrona, Sweden..
    Gurbatov, S. N.
    Nizhnii Novgorod State Univ, RUS.
    Statistical Problems for the Generalized Burgers Equation: High-Intensity Noise in Waveguide Systems2018Inngår i: Doklady. Mathematics, ISSN 1064-5624, E-ISSN 1531-8362, Vol. 97, nr 1, s. 95-98Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    A one-dimensional equation is presented that generalizes the Burgers equation known in the theory of waves and in turbulence models. It describes the nonlinear evolution of waves in pipes of variable cross section filled with a dissipative medium, as well as in ray tubes, if the approximation of geometric acoustics of an inhomogeneous medium is used. The generalized equation is reduced to the common Burgers equation with a dissipative parameter-the "Reynolds-Goldberg number," depending on the coordinate. The method for solving statistical problems corresponding to specified characteristics of a noise signal at the input of the system is described. Integral expressions for exact solutions are given for the correlation function and the noise intensity spectrum experiencing nonlinear distortions during propagation in a waveguide. For waves in a dissipative medium, an approximate method of calculating statistical characteristics is given, consisting in finding an auxiliary correlation function and the subsequent nonlinear functional transformation. Solutions have a complicated form, so physical analysis of phenomena requires the numerical methods. For some correlation functions of stationary noise with initial Gaussian statistics and some waveguide systems, it is possible to obtain simple results.

  • 232.
    Rudenko, Oleg
    et al.
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för maskinteknik.
    Hedberg, Claes
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för maskinteknik. Blekinge Inst Technol, S-37179 Karlskrona, Sweden..
    SINGLE SHOCK AND PERIODIC SAWTOOTH-SHAPED WAVES IN MEDIA WITH NON-ANALYTIC NONLINEARITIES2018Inngår i: Mathematical Modelling of Natural Phenomena, ISSN 0973-5348, E-ISSN 1760-6101, Vol. 13, nr 2, artikkel-id UNSP 18Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The review of new mathematical models containing non-analytic nonlinearities is given. These equations have been proposed recently, over the past few years. The models describe strongly nonlinear waves of the first type, according to the classification introduced earlier by the authors. These models are interesting because of two reasons: (i) equations admit exact analytic solutions, and (ii) solutions describe the real physical phenomena. Among these models are modular and quadratically cubic equations of Hopf, Burgers, Korteveg-de Vries, Khokhlov-Zabolotskaya and Ostrovsky-Vakhnenko type. Media with non-analytic nonlinearities exist among composites, meta-materials, inhomogeneous and multiphase systems. Some physical phenomena manifested in the propagation of waves in such media are described on the qualitative level of severity.

  • 233.
    Rudenko, Oleg
    et al.
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för maskinteknik.
    Hedberg, Claes
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för maskinteknik.
    Strong nonlinearity, anisotropy, and solitons in a lattice with holonomic constraints2019Inngår i: Wave motion, ISSN 0165-2125, E-ISSN 1878-433X, Vol. 89, s. 104-115Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The nonlinear dynamics of a crystal lattice where the atoms are positioned along parallel rods is studied. They may move only in one direction and this constraint leads to the appearance of nonlinearity even the forces between the atoms obey the linear Hooke's law. This nonlinearity turns out to be strong. The equations of motion of the individual lattice atoms are written, and. in the continuum limit when the lattice period is small in comparison with the wavelength, a new strongly nonlinear partial differential equation is derived. The waves traveling in the direction orthogonal to the rods are purely transverse slow waves, governed by an equation of the Heisenberg type. In the direction along the rods, a fast purely longitudinal wave can propagate. In general, when the wave travels at an arbitrary angle, it is neither purely longitudinal nor transverse and the periodic structure exhibits anisotropic properties. Their velocity depends strongly on the direction of propagation and the structure exhibits properties similar to a skeletal muscle with stretched fibers. Special attention is paid to the soliton solutions of this equation and their behavior is studied. For non-stationary quasi-longitudinal waves, a new evolution equation, rich in symmetries, is derived. One of the solutions with a fixed transverse structure is described by elliptic integrals and evolves in accordance with a cubic nonlinear equation of the Klein–Gordon type. © 2019 Elsevier B.V.

  • 234.
    Ruvald, Ryan
    et al.
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för maskinteknik.
    Frank, Martin
    Volvo Construction Equipment, SWE.
    Johansson, Christian
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för maskinteknik.
    Larsson, Tobias
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för maskinteknik.
    Data Mining through Early Experience Prototyping: A step towards Data Driven Product Service System Design2018Inngår i: IFAC PAPERSONLINE, Elsevier, 2018, Vol. 51, nr 11, s. 1095-1100, artikkel-id 11Konferansepaper (Fagfellevurdert)
    Abstract [en]

    The construction industry is ripe for disruption through innovative solutions that provide added productivity. Equipment manufacturers are attempting to disrupt their industry with investments in autonomy, electrification and product-service system business models. Designing solutions that will operate in completely new systems or modify an existing complex system require new approaches to address the uncertainty of system impacts. An iterative approach can help tackle ambiguity through cyclical validation of design decisions. Data mining in each cycle adds a quantitative dimension to the rationale of decision making, but data is sparse and difficult to collect in parallel with design of theoretical product-service systems operating in future scenarios. This can be combated using experiential prototyping techniques to design flexible infrastructure that supports contextualized data gathering in a variety of focused design sprints using Design, Build and Test approach. The intricacy of designing innovative solutions to increase productivity in the construction industry can be untangled by framing aspects of the problem in small sprints and testing them in a contextualized setting built to generate functional data to drive design.

  • 235.
    Sajjan, Dev
    et al.
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för industriell ekonomi.
    Petersson, Henrik
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för industriell ekonomi.
    Success Factors for Quality in Product Development2014Independent thesis Advanced level (degree of Master (One Year))Oppgave
    Abstract [en]

    Background: Today’s fast-paced product development cycles and increasing complexity of automotive products require new processes, methods and tools to manage product development organizations. Besides that, reduced cost and higher product quality calls for increased product development effectiveness and efficiency since product development stands for significant part of the quality costs. This implies a need for holistic approach by sharing and creating new knowledge and faster problem solving in projects. Purpose: The aim of this thesis is to examine the factors that affect product quality, development cost and development time in automotive product development organizations. This thesis reviews existing literature in fields of quality management, lean product development and knowledge management with special focus on the factors that affect product quality, cost and development times. Three factors that affect product quality, cost and time are identified as:  Cross functional teams  Knowledge Integration  Knowledge Flexibility Method: A qualitative research case study is performed at a major automotive manufacturer in Sweden. Semi structured interviews are used to collect as much information as possible from respondents at two automotive product development companies. Collected data is analyzed using pattern matching techniques where the theoretical model is tested against the observed or actual model. Member checking and peer reviews are used to further enhance the credibility of this study. Main findings: The outcome of this study is that product quality can be improved by using the cross-functional teams, work force with knowledge in multiple fields and by integrating previous product knowledge during the product development. Knowledge creation and sharing are fundamental in innovative product development. As such organizations need to develop processes to facilitate knowledge sharing and knowledge creation. Information integration may not be effective during innovative product development due to the lack of previous product knowledge. Both cross functional teams and knowledge integration appears to have strong influence on product quality and development cost. However, knowledge flexibility is not fully supported for development of innovative products. It appears that both generalists and specialists are needed to not end up in quality issues or loss of innovations. Project leaders with skills in more than one field will improve correct and timely decision making as well as integrating different views in cross functional teams which will lead to improved product quality and lower development cost and time.

  • 236.
    Sammak, Majed
    et al.
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för industriell ekonomi.
    Khader, Eyad
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för industriell ekonomi.
    Situation leadership in small growing technical consultations companies in Sweden and Jordan2014Independent thesis Advanced level (degree of Master (One Year)), 10 poäng / 15 hpOppgave
    Abstract [en]

    Background Small and medium businesses (SME) are important elements in the strategies of economic growth and improvement. The SME have played a great role in regional and global economic recovery during many years and thus they are very desirable. Small business leaders have to fulfil a wide range of roles and responsibilities however, the most important role being the leader role. Valdiserri (Valdiserri and Wilson, 2010) stated that poor leadership is one of the main failure reasons for small businesses. Furthermore, different countries may have different leadership styles and culture. Aim The purpose of this thesis is to identify the differences between the leadership styles in small technical companies in Sweden, an industrialized country, and Jordan, a developing country Method We adopted the study case method to study the leadership style in small companies. Through pre-defined questionnaire surveys, the leaders of eight small businesses (four companies in Sweden and four in Jordan) were asked to answer multifactor questions. We then studied the answers based on three situational leadership models. The situational methods used in our study were the Fiedler model, the normative model and the SLII model. The answers were then analysed in order to determine the current as well as the appropriate leadership style based on the models. Results In brief, our study identified several examples of different leadership styles in various situations in small companies and presented the most suitable leadership in those situations. The thesis also shed light on differences in small technical company leadership in Sweden and Jordan. The analysis of the case studies of the studied companies showed that the situational leadership methods could be used in small companies. The study concluded that in order to identify the leadership style, more than one model had to be used. In general, the leadership style in the Swedish companies matched the recommended leadership style. The Jordanian companies’ leadership style however did not match the recommended leadership style. The models in our framework also revealed the reasons behind and also proved to be valuable tools in recommending the suitable leadership style for all companies. The used models in our thesis however lacked the appropriate tools to explain the differences between the Swedish and Jordanian companies. The differences are thought to be due to cultural aspects, however, these models does not take in account the cultural aspect nor the size of the companies, an issue pointed out by Gary (Yukl, 2002). Conclusion The situational leadership style model was shown to be fully applicable in our case study as in previous literature. The conducted study suggested that more than one model had to be used in order to identify the suitable leadership style. Interestingly, the models used were clearly applicable in Middle East companies. This was, to our knowledge, the first time these models were used in Middle East countries when studying leadership style. Furthermore, the studied situational leadership style showed a clear difference in leadership between Sweden and Jordan. The models recommended a participative style in the small technical companies both in Sweden and Jordan. However, the current practiced leadership style in the Jordan companies were not exhibiting the recommended leadership style. Interviewing the leaders in the Jordanian companies gave us a hint that this difference could be due to cultural differences. The cultural differences must thus be born in mind when interpreting the data and trying to understand the reasons behind the results when studying these models. The Jordanian companies used more power leadership (telling leadership) than their Swedish counterparts who exhibited a participating leadership. According to (Hofstede, 1991) leadership in Arab culture show higher power distance than in Nordic companies. Our results thus coincide with previous studies. However more studies need to be made in order to draw conclusions on whether this is a common phenomenon in all Jordanian or Middle East companies and our thesis present an interesting pilot study in this regard.

  • 237. Sandberg, Marcus
    et al.
    Boart, Patrik
    Larsson, Tobias
    Polhem Laboratory, Luleå University of Technology.
    Functional product life-cycle simulation model for cost estimation in conceptual design of jet engine components2005Inngår i: Concurrent Engineering - Research and Applications, ISSN 1063-293X, E-ISSN 1531-2003, ISSN 1531-2003, Vol. 13, nr 4, s. 331-342Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    As functional (total care) products emerge in the jet engine industry, the need for product life-cycle models capable of definition and evaluation of life cycle properties increases, since functional products (FP) includes both hardware and service. Recent life-cycle models are intended for hardware products and mostly handle design and manufacturing knowledge. The aim of this article is to present a design approach that extends the evaluation capabilities beyond classical hardware design and manufacturing evaluation. The focus has been to introduce evaluation of manufacturing and post-manufacturing activities in evaluation of conceptual designs. For this purpose, a model has been proposed to handle the information flow between teams when developing structural jet engine components. A case study, in which the proposed model was used in cooperation with a jet engine component manufacturer, is presented. Aspects concerning design, manufacturing, performance, and maintenance of jet engine flanges were included in the example by means of a knowledge based engineering (KBE)-system coupled to databases and spreadsheets. The model is more suitable than recent work for the development of hardware parts of functional products (HFP), since knowledge from more product development disciplines is included. As the engineer changes the design and directly assesses the life-cycle cost (LCC) and how the changes impact the interface to other jet engine components, more knowledge on the impact of design decisions is available at hand for the engineering designer than without the model

  • 238. Sandberg, Marcus
    et al.
    Larsson, Tobias
    Luleå University of Technology.
    Automating redesign of sheet-metal parts in automotive industry using KBE and CBR2006Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Automating redesign is an approach for engineering designers to prevent design related manufacturability problems in early product development and thus reduce costly design iterations. A vast amount of work exists, with most research findings seemingly staying within the research community rather than finding its way into use in industrial settings where research issues have often evolved from the concerned applied research. The aim of this paper is to present an approach with industrial implementation potential regarding automating redesign of sheet-metal components in early product development to avoid manufacturing problems due to design flaws and non-optimal designs. Geometry, generated by a knowledge-based engineering (KBE) system, gives input to the case-based reasoning (CBR) governed manufacturing planning. If geometry is found non-manufacturable or enhancement of already manufacturable geometry is possible, the CBR system will suggest redesign actions to resolve the problem. CBR extends the capabilities of the rule-based KBE-system by enabling plan-based evaluation. The approach has the potential for industrial implementation, since KBE is often closely coupled to an industrial CAD-system, hence enabling technology is at the industry. Also, combining KBE and CBR reduces the coding effort compared to coding the whole design support with CBR, as feature recognition is simplified by means of KBE. A case study of development of sheet-metal manufactured parts at a Swedish automotive industry partner presents the method in use. As it is shown that redesign can be automated for sheet-metal parts there is a potential for reducing costly design and manufacturing iterations.

  • 239. Sandberg, Stefan
    et al.
    Kalhori, Vahid
    Larsson, Tobias
    Luleå University of Technology.
    FEM simulation supported knowledge enabled engineering in high strength steel car body design2004Konferansepaper (Fagfellevurdert)
    Abstract [en]

    With an increasing number of and also more complex demands on today’s automobiles the need for fast and accurate simulations to support the Engineering Design (ED) process is getting more important. The demands that are put on the automotive designs are often contradictory i.e. weight against stiffness, and no one optimal set of solutions can be found, rather a trade-off situation. At Volvo Cars Corporation, known all over the world for their safety policy, the advancement to more high strength materials is causing new problems for the engineers. As widely known, a steel material that has been exposed to plastic deformation will suffer hardening in those areas. The work in this paper, exemplified in a deployed demonstrator, show that it is possible to combine forming and crashworthiness simulations in an automated way to make advanced simulation accessible to more people in the product development process. The Knowledge Enabled Engineering (KEE) demonstrator combines forming and crashworthiness simulations for dealing with the constant trade-off in ED.

  • 240. Sansberg, Marcus
    et al.
    Larsson, Tobias
    Luleå University of Technology.
    Åström, Peter
    Näsström, Mats
    A design tool integrating CAD and virtual manufacturing for distortion assessment2005Inngår i: Proceedings of the 15th International Conference on Engineering Design, ICED'05, Melbourne, Australia, 2005Konferansepaper (Fagfellevurdert)
    Abstract [en]

    In the aero space industry, design for manufacturing promotes machining predictions using finite element analysis during design. Today design and computational engineers often are far from integrated. The design tool in this paper couples the simulation of distortion effects due to machining with CAD, where knowledge of how to perform a machining simulation is captured within the tool. The tool system is governed by a UNIX shell script and uses Python scripts for pre- and post-processing purposes coupled to the finite element software MSC.MarcTM. The tool allows an engineer to estimate the distortion effects due to machining and is believed to help bridge the gap between design and computational engineers in the manufacturing planning stages of engineering design. By using tools like the one presented here, both component quality and accuracy of machining operation cost estimation can be expected to increase, since distortion problems can be solved or prevented already in the manufacturing planning stages of engineering design. Thus design for manufacturing is enhanced since redesign due to inferior manufacturing can be reduced.

  • 241.
    Shahdaei, Koorosh
    Blekinge Tekniska Högskola, Sektionen för management.
    Driving Strategic Transformation: Case of Service Delivery in Telecom Industry2012Independent thesis Advanced level (degree of Master (One Year))Oppgave
    Abstract [en]

    The aim of this paper is to sketch out a proposal for master thesis in the area management control. This thesis focuses on how managers should use the management control systems to enforce strategic transformation. These ideas are currently subject of academic and industrial research. As theoretical and practical foundation, this thesis will be inspiring for project oriented corporate specializing in service delivery especially in the field of Telecom sector. Considering today’s global rivalry, with continuous emerging complex projects, relating matrix organizations and customers, alongside with human factors drawn in; makes Service Delivery companies particularly unstable. In the era of information technology the service delivery companies are subject to continuous strategic transformation to be able to create sustainable competitive advantages and stay in the business. [1] framework is used as starting point of this paper. This framework proposes two excessive points of reference to categorize management control systems i.e. interactive versus analytical systems and level of management control. This thesis intends developing two novel ideas; firstly, that the framework of interpretation could be dragged out to cover parameters such as control system, and incentive system, management tool, and organizational structure; secondly, it investigates how these parameters would link up rationally in a combined manner. The organizational factor arises from the literature on project management that bringing together the issues for driving new product lines and related service deliveries. Management literature on control systems has inspired the idea of the tool for supporting a smooth strategic transformation. Among other things, it stresses the importance of matrix coordination for the service delivery organizations. Furthermore incentive factor could take part in enforcing transformation on strategic level even healthier. As a foundation for empirical study, a case study has been performed to explore the significance of above mentioned management control method. The studies represent several years of research with focus of strategic transformations. The studies suggested how these transformations were setup and interpreted in a framework of above mentioned parameters. A more efficient arrangement would contribute to a better interactive and analytical features. This approach, which is characterized for service delivery organizations, tenders an gripping idea to be explored in future researches.

  • 242.
    shareef, Haidar
    et al.
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för industriell ekonomi.
    Villatoro, Jose Carlos
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för industriell ekonomi.
    Identification of performance gaps in service interactions that influence customer satisfaction2014Independent thesis Advanced level (degree of Master (One Year))Oppgave
    Abstract [en]

    This thesis project is aimed to investigate how gaps in the form of mistakes and flaws can be identified and minimized during customer service interactions. The Service Concept model by Goldstein et al. (2002) is used to create strategic alignment and to minimize the gap between customers’ needs and the company’s intentions of the delivered service. Also, Watkinson’s (2013) principles on how to create satisfied customers and enhancing the customer experience is used as well as Chien et al. (2002) framework for customer satisfaction. The GAPS Model by Parasuraman et. al. (2004) is also used to identify service quality gaps. The study is designed following the case study methodology. Data was collected through a qualitative means, interviewing a mix of employees at three levels (back-office, front-end and managers) at the service department at company Services1. Major findings were that customer expectations, quality and objectives, alignment of service strategy and execution, communication, relationships, customer satisfaction knowledge, motivation and engagement, and sharing customer feedback of the customer service were not unified and clear for all the levels. There are mismatches in the previous topics at Services1 that influence performance in customer satisfaction.

  • 243.
    Sigvant, Mats
    et al.
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för maskinteknik.
    Falk, Johannes
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för maskinteknik.
    Pilthammar, Johan
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för maskinteknik.
    Experiments and FE-simulations of stretch flanging of DP-steels with different shear cut edge quality2017Inngår i: Journal of Physics: Conference Series / [ed] Volk W., Institute of Physics Publishing , 2017, Vol. 896, nr 1, artikkel-id 012101Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Dual-Phase (DP) steels are today used in the automotive industry due to its large strength to weight ratio. However, the high strength of DP-steel does have a negative impact on the general formability in sheet metal forming. Unfavourable process conditions in the press shop will, on top of this, reduce the formability of DP-steels even more. This paper addresses the problem of edge fracture in stretch flanges in sheet metal parts made of DP-steel. The experimental part involves tests of ten different DP590 and DP780 steel grades with three different shear cut qualities. The influence on the fracture strain of the sample orientation of the shear cut are also studied by facing the burr away or towards the punch and testing samples with the cut edge parallel with the rolling direction and the transverse direction. The strains are measured with an ARAMIS system in each test, together with punch displacement and punch force. All tests are then simulated with AutoFormplus R7 and the results from these simulations are compared with the experimental results in order to find the appropriate failure strain for each combination of supplier, coating, thickness and shear cut quality. © Published under licence by IOP Publishing Ltd.

  • 244.
    Sigvant, Mats
    et al.
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för maskinteknik.
    Pilthammar, Johan
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för maskinteknik.
    Hol, J.
    TriboForm Engineering, NLD.
    Wiebenga, J. H.
    TriboForm Engineering, NLD.
    Chezan, Toni
    Tata Steel, NLD.
    Carleer, Bart
    AutoForm Engineering Deutschland GmbH, DEU.
    Van Den Boogaard, A. H.
    University of Twente, NLD.
    Friction in Sheet Metal Forming: Forming Simulations of Dies in Try-Out2018Inngår i: Journal of Physics: Conference Series, Institute of Physics Publishing , 2018, nr 1Konferansepaper (Fagfellevurdert)
    Abstract [en]

    The quality of sheet metal formed parts is strongly dependent on the tribology and friction conditions that are acting in the actual forming process. This paper focuses on the tribology conditions during early try-out of dies for new car models. The motivation for the study is that the majority of the forming simulations at Volvo Cars are performed to secure the die try-out, i.e. solve as many problems as possible in forming simulations before the final design of the die and milling of the casting. In the current study, three closure parts for the new Volvo V60 model have been analysed with both Coulomb and TriboForm friction models. The simulation results from the different friction models are compared using thickness measurements of real parts, and 3D geometry scanning data of the parts. Results show the improved prediction capability of forming simulations when using the TriboForm friction model, demonstrating the ability to accurately describe try-out conditions in sheet metal forming simulations. © 2018 Institute of Physics Publishing. All rights reserved.

  • 245.
    Siiskonen, Maria
    et al.
    Chalmers University of Technology, Division of Product Development, Department of Industrial and Materials Science.
    Watz, Matilda
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för strategisk hållbar utveckling.
    Malmqvist, Johan
    Chalmers, SWE.
    Folestad, Staffan
    Astra Zeneca, SWE.
    Decision Support for Re-Designed Medicinal Products: Assessing Consequences of a Customizable Product Design on the Value Chain from a Sustainability Perspective2019Inngår i: Proceedings of the Design Society: International Conference on Engineering Design, Cambridge University Press, 2019Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Despite advances in pharmacological research providing means for individually customized patient attribute treatments, the 'one-size-fits-all' paradigm remains. Customization is associated with cost increases and the value assessment of customized medicinal products shows upon a narrow economic focus. Inspired by value models, emerging in manufacturing industry research, this study suggests a novel methodology encompassing a full sustainability perspective, including the social, economic and ecological dimension, for design decision support for medicinal products. A concept screening matrix is adapted, using sustainability criteria as value indicators. The focus is to create value for the whole pharmaceutical value chain whilst keeping the core purpose of medicinal products, i.e. to bring societal benefits. An illustrative case study presents an application of the methodology on a commercial product for curing hypertension. The traditional product design for hypertension treatment is compared to a customized product design. Results indicate that a customized product design is preferable if value is to be created from a social or/and an ecological sustainability perspective.

  • 246.
    Sjöholm, Daniel
    et al.
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för maskinteknik.
    Swärdh, Ida
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för maskinteknik.
    Processoptimering för tester av isolering i högspänningskablar2018Independent thesis Basic level (university diploma), 12 poäng / 18 hpOppgave
  • 247.
    Smailagic, Andrej
    et al.
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för industriell ekonomi.
    Smailagic, Sandro
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för industriell ekonomi.
    Designing and Implementing Process Management in R&D; A Practical Application in the Flooring Industry2014Oppgave
    Abstract [en]

    Due to increasing global competition and narrowing customer requirements companies are moving towards quality focused improvements. It is becoming equally important how you perform as what you perform. Companies are thriving to identify, measure and control their processes in order to as efficiently as possible satisfy their customers regarding quality, price and delivery time. The process orientation is changing the way companies develop routines, tools and communications systems. Management roles and responsibilities are changing and in order to manage future success companies focus on process management to assure quality. Corporate quality assurance systems and international standardization organizations are creating a system for managing quality assurance with high level strategies and metrics. The difficulty for companies is to implement quality assurance and systems to really fit their business and specific operational routines. Concepts like Toyota Way, BPR, and TQM are originating from production units. Implementing them within the intangible, value adding and complex activities in R&D requires a systematic and holistic approach to identify and visualize the flow of information rather than material. Input to the R&D process is information on needs, requirements or possibilities and output is new and improved products through a wide range of exploring and developing phases consisting of both artistic and technical challenges. In order to standardize the development process and at the same time maintain creativity front-loading proactive process management may accomplish issues and planning for potential modifications. The result of the thesis project is an interactive cross-functional computer based process management system. In order to implement the scientifically approved process tools into specific processes a strong learning culture among the whole company is required. In order to stimulate the use and training of quality tools and systems the authors have discovered that visualization and interaction is a core success factor. Corporate management needs to interact with employees in order to translate tacit knowledge into corporate best practice. The developed collaborative platform is a tool to enhance communication, enforce quality methods and improve knowledge management to assure the final delivery of total quality to customers.

  • 248.
    Sota, Emmanuel Perez
    et al.
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för industriell ekonomi.
    Qollakaj, Kushtrim
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för industriell ekonomi.
    Förutsägelse av produktionskostnaden för svetsade konstruktioner2015Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    Volvo Construction Equipment with headquarters in Eskilstuna is the world's oldest and one of the leading companies in the construction industry with products such articulated haulers, wheel loaders, excavators and skid steer loaders. The main purpose of this study is to create a tool for predicting the production cost of welded structures for the company's articulated haulers, which today is world leading on the market. To succeed, the study has been broken down in three problem areas in which the first one is to completely map out today's manufacturing process of the six basic components of the articulated hauler model A40 (A-Stay front, A-Stay rear, short and long rods and front and rear frame) for both manual and robotic welding. Account is taken to each weld in the manufacturing process and all costs incurred. Various types of welding measurements such as thread consumption for both manual and robotic welding, weld length for both manual and robotic welding is taken account to. The weld metal weight, arc time, robot degree length, deposition rate, price per meter, price per kilo and the total cost for each component has been measured and calculated. Next problem area starts from the identification of the manufacturing process and the purpose is to identify the largest cost culprits to lower manufacturing process costs and making the manufacturing process more efficient. As regards the third and final problem area on basis of the results from the two past problem areas regression is used to generate a mathematical formula that is used to predict the production of welded components for the company's articulated haulers. The final tool that is sought was created in form of a software by embedding the mathematical formula obtained from the regression. Now one can easily predict the production cost of welded structures by using the following tool. The only thing you need to do to predict any production cost of a welded structure is to enter the drawing welding weight, item weight, average welding length, proportion of butt weld percentage and the butt weld length for manual and robot welding.

  • 249.
    Stavileci, Shkrep
    et al.
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för maskinteknik.
    Andersson, David
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för maskinteknik.
    An assessment of how Circular Economy can be implemented in the Aerospace Industry2015Independent thesis Advanced level (degree of Master (Two Years)), 20 poäng / 30 hpOppgave
    Abstract [en]

    Circular Economy can provide support and is significance to society for the direction towards a more sustainable economical and ecological environment. In contradiction to use a product and then discarding it is reuse, remanufacturing and recycling important pieces in recourse optimized process where materials are not systematically leaving the loop. But what should these actions and business models be for a company in the manufacturing industry that focuses on Circular Economy.This master thesis will present a case study for the manufacturing industry, GKN Aerospace Sweden. The study argues for a combination of multiple business models, evaluating and finding critical metal alloys and investigates manufacturing technologies for Circular Economy. The data was collected from conducted interviews with managers at different departments ranging from treasury, product development, production, after market, quality and material-handling.Rare and expensive metal alloys, long lead times for productions and long lifecycles for the produces components are the purpose for the implementation of solutions for how to reach a Circular Economy within the aerospace industry. These challenges are not only a financial risk but also make a company vulnerable for external threats. There is a need for more knowledge about sustainable development and material handling for product development to avoid dependence on rare, expensive core materials.We found, during the benchmarking of GKN Aerospace Sweden current business models, that the solution to reach Circular Economy must include a combination of sustainable awareness, technical innovation platform and a value proposition to customers, which consist more than physical products. Our suggestions to the company for them to implement Circular Economy are the following; i) actively try to get an overview and own a larger part of the products lifecycle, from development, production and maintenance; ii) continue the development of additive manufacturing because of its cost efficient potential and its efficient use of metal powders; iii) use recycled metal chips from manufacturing as input material to new production and maintenance. These changes together are a solution for GKN Aerospace Sweden to contribute to a financial as well as ecological sustainable development.

  • 250.
    Stenberg, Sandra
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för maskinteknik.
    Förstudie med förändringsförslag för omorganisation av mindre företag2014Oppgave
    Abstract [sv]

    BAGA Water Technology är ett svenskt företag som är verksamt inom vattenhantering med fokus på konstruktion och tillverkning av reningsverk särskilt anpassade för att klara de nordiska förhållandena. De är en av marknadens ledande aktörer inom området vilket gör att en ständig utveckling krävs för att konkurrenskraften ska bibehållas. Företagets huvudkontor är beläget i Karlskrona medan produktion och lagerhållning till största delen är outsourcat till en underleverantör i Norge och en i Blekinge (UL.B). Outsourcingen till UL.B har visat sig inge problem då kvalitén av produkter inte är tillfredsställande samtidigt som den spridda lagerhållningen och produktionen gör logistiksystemet komplext och svårhanterligt. Arbetets syfte är således att göra en förstudie där BAGA erhåller data som kan användas för att ta beslut om en omorganisation av företagets outsourcade lager och produktion är en rimlig lösning på problemen samtidigt som implementerbara förändringsförslag tillhandahålls. Genom användning av Lean Six Sigmas modell för förbättringsarbete, DMAIC, samt förespråkade verktyg har först en nulägesanalys av processer och flöden kopplade till UL.B genomförts. Intervjuer och observationer både på BAGA och hos UL.B har verkat som grundläggande data. Utifrån den samlade informationen har en orsak-verkan analys gjorts med fokus på de båda problemområdena, där orsakerna sedan har prioriterats i en FMEA. Framtagning av tre förbättringsförslag har därefter gjorts, där det förslag som ansågs mest fördelaktigt är att BAGA bör investera i en utökad egen verksamhet genom tillbyggnad av en lagerbyggnad intill kontoret i Karlskrona. Detta möjliggör en förflyttning av lager och produktion från UL.B till BAGA. Beskrivningen av förändringsförslaget presenterar bland annat förändringar i processer och flöden men även förslag på en fysisk utformning där ett effektivitetstänk enligt Lean Six Sigma ständig genomsyrar arbetet. Slutligen presenteras en kostnadskalkyl som jämför nuläget med det föreslagna scenariot där det visar sig att förslaget ger en ekonomisk vinning. Utifrån de många positiva argument som har framkommit, bland annat att förslaget bidrar med minskade transporter och ett ökat inflytande över produktionen, anses det som ett strategiskt riktigt beslut att implementera förbättringsförslaget.

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