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  • Andersson, Martin
    et al.
    Blekinge Institute of Technology, Faculty of Engineering, Department of Industrial Economics.
    Kim, Hong-sok
    Seoul National University, PRK.
    Kohlhase, Janet
    University of Houston, USA.
    Editorial Annals of Regional Science2020In: The annals of regional science, ISSN 0570-1864, E-ISSN 1432-0592Article in journal (Refereed)
  • Dahl, Mattias
    et al.
    Blekinge Institute of Technology, Faculty of Engineering, Department of Mathematics and Natural Sciences.
    Javadi, Mohammad Saleh
    Blekinge Institute of Technology, Faculty of Engineering, Department of Mathematics and Natural Sciences.
    Analytical modeling for a video-based vehicle speed measurement framework2020In: Sensors, ISSN 1424-8220, E-ISSN 1424-8220, Vol. 20, no 1, article id 160Article in journal (Refereed)
    Abstract [en]

    Traffic analyses, particularly speed measurements, are highly valuable in terms of road safety and traffic management. In this paper, an analytical model is presented to measure the speed of a moving vehicle using an off-the-shelf video camera. The method utilizes the temporal sampling rate of the camera and several intrusion lines in order to estimate the probability density function (PDF) of a vehicle’s speed. The proposed model provides not only an accurate estimate of the speed, but also the possibility of being able to study the performance boundaries with respect to the camera frame rate as well as the placement and number of intrusion lines in advance. This analytical model is verified by comparing its PDF outputs with the results obtained via a simulation of the corresponding movements. In addition, as a proof-of-concept, the proposed model is implemented for a video-based vehicle speed measurement system. The experimental results demonstrate the model’s capability in terms of taking accurate measurements of the speed via a consideration of the temporal sampling rate and lowering the deviation by utilizing more intrusion lines. The analytical model is highly versatile and can be used as the core of various video-based speed measurement systems in transportation and surveillance applications. © 2019 by the authors. Licensee MDPI, Basel, Switzerland.

  • Hansson, Christina
    Blekinge Institute of Technology, Education Development Unit.
    Lärarlärdom: högskolepedagogisk konferens 20192019Collection (editor) (Refereed)
    Abstract [sv]

    Högskolepedagogisk utveckling har under senare år fått en tydligare och mer framträdande roll vid universitet och högskolor. Under senare år har också ett allt större fokus riktats mot utbildningars resultat. Frågor som rör kvaliteten i undervisningen blir därmed centrala. Att utveckla och stödja lärares pedagogiska skicklighet samt belysa villkoren för den undervisning som bedrivs inom högre utbildning är angeläget. Behovet är stort av en gemensam samlingspunkt för pedagogiska och didaktiska diskussioner där lärare och andra yrkeskategorier som är intresserade av av ämnet kan träffas och föra dessa diskussioner tillsammans och över ämnesgränser. Blekinge Tekniska Högskola, Högskolan i Kristianstad och Malmö universitet samarrangerar därför den årliga högskolepedagogiska konferensen Läralärdom.

    Lärarlärdom 2019 gick av stapeln på Blekinge Tekniska Högskola i Karlskrona den 15 augusti och samlade ett sjuttiotal deltagare. Ett urval av konferensens presentationer finns på https://play.bth.se

  • Anwar, Mahwish
    Blekinge Institute of Technology, Faculty of Computing, Department of Computer Science.
    Connect2SmallPorts: An EU Project on Digitalizing Small Ports of the South Baltic Region. Poster ID: P20-206202020Other (Other (popular science, discussion, etc.))
    Abstract [en]

    Ports play pivotal role in the global supply chain network. To strengthen the ports’ business and to keep up with the overall economic development of the country, the port stakeholders have started to invest in the digital technologies. The ports as well as the individual municipalities in Europe are in contest with other ports within the region. One of the competing factors is that of the port’s technological development. Unlike large ports, the small ports within Europe, for example Port of Karlskrona, Port of Wismar or Port of Klaipeda, which also serve as crucial nodes within the trade flow for Sweden, Germany and Lithuania respectively, lack the knowledge and tools to leverage the potential of digital technologies. The digital disruption at ports is inevitable!

    With that being established the scope of the project - South Baltic Small Ports as Gateways towards Integrated Sustainable European Transport System and Blue Growth by Smart Connectivity Solutions – or Connect2SmallPorts project is to understand how to facilitate small and medium ports of the South Baltic region with the digital technologies - Blockchain and Internet of Things. During the project lifetime (2018 to 2021) the main goals are to perform the digital audit of small ports of the South Baltic region; to prepare an implementation strategy for Blockchain and Internet of Things specifically for the small ports in the South Baltic region and to conduct an evaluation of the proposed strategies. The project correspondingly aims to disseminate the knowledge and experiences through research publications, industrial conferences and international tradeshows.

  • Jagtap, Santosh
    et al.
    Blekinge Institute of Technology, Faculty of Engineering, Department of Mechanical Engineering.
    Larsson, Tobias
    Blekinge Institute of Technology, Faculty of Engineering, Department of Mechanical Engineering.
    Resource-Limited Societies, Integrated Design Solutions, and Stakeholder Input2019In: She Ji: The Journal of Design, Economics, and Innovation, ISSN 2405-8726, Vol. 5, no 4, p. 285-303Article in journal (Refereed)
    Abstract [en]

    Poverty is a multidimensional issue, characterized by deprivations and constraints at the individual, institutional, economic, and technological level. To satisfy the unmet or underserved needs of people living in poverty, the relevant constraints in the target context must be addressed via integrated design solutions. Although previous studies in this field show that designing integrated solutions requires input from multiple stakeholders, there is a lack of relevant research examining the nature of this input. To address this, using a case study methodology, we analyzed three design projects that have successfully responded to the pertinent constraints within each context by supporting social and human development among its marginalized populations. Based on our findings, we designed a stakeholder input framework categorizing a diverse range of stakeholder perspectives—both inside and outside the context of poverty—that can contribute towards integrated solutions design. The findings and resulting stakeholder input framework can help designers gain a deeper appreciation of the constraints faced by marginalized societies, and how design input from various stakeholders can be mobilized to overcome these constraints and create value for resource-poor people.

  • Glantz, Andreas
    et al.
    Region Skåne, SWE.
    Örmon, Karin
    Malmö Högskola, SWE.
    Sandström, Boel
    Blekinge Institute of Technology, Faculty of Engineering, Department of Health.
    "how do we use the time?": An observational study measuring the task time distribution of nurses in psychiatric care2019In: BMC Nursing, ISSN 1472-6955, E-ISSN 1472-6955, Vol. 18, no 1, article id 67Article in journal (Refereed)
    Abstract [en]

    Background: The nurse's primary task in psychiatric care should be to plan for the patient's care in cooperation with the patient and spend the time needed to build a relationship. Psychiatric care nurses however claim that they lack the necessary time to communicate with patients. To investigate the validity of such claims, this time-motion study aimed at identifying how nurses working at inpatient psychiatric wards distribute their time between a variety of tasks during a working day. Methods: During the period of December 2015 and February 2016, a total of 129 h and 23 min of structured observations of 12 nurses were carried out at six inpatient wards at one psychiatric clinic in southern Sweden. Time, frequency of tasks and number of interruptions were recorded and analysed using descriptive statistics. Results: Administering drugs or medications accounted for the largest part of the measured time (17.5%) followed by indirect care (16%). Relatively little time was spent on direct care, the third largest category in the study (15.3%), while an unexpectedly high proportion of time (11.3%) was spent on ward related tasks. Nurses were also interrupted in 75% of all medication administering tasks. Conclusions: Nurses working in inpatient psychiatric care spend little time in direct contact with the patients and medication administration is interrupted very often. As a result, it is difficult to establish therapeutic relationships with patients. This is an area of concern for both patient safety and nurses' job satisfaction. © 2019 The Author(s).

  • Moraes, Ana Luiza Dallora
    et al.
    Blekinge Institute of Technology, Faculty of Engineering, Department of Health.
    Sanmartin Berglund, Johan
    Blekinge Institute of Technology, Faculty of Engineering, Department of Health.
    Brogren, Martin
    Optriva AB, SWE.
    Kvist, Ola
    Karolinska, SWE.
    Ruiz, Sandra Diaz
    Karolinska, SWE.
    Dübbel, André
    Optriva AB, SWE.
    Anderberg, Peter
    Blekinge Institute of Technology, Faculty of Engineering, Department of Health.
    Age assessment of youth and young adults using magnetic resonance imaging of the knee: A deep learning approach2019In: Journal of Medical Internet Research, ISSN 1438-8871, E-ISSN 1438-8871, Vol. 21, no 12, article id e16291Article in journal (Refereed)
    Abstract [en]

    Background: Bone age assessment (BAA) is an important tool for diagnosis and in determining the time of treatment in a number of pediatric clinical scenarios, as well as in legal settings where it is used to estimate the chronological age of an individual where valid documents are lacking. Traditional methods for BAA suffer from drawbacks, such as exposing juveniles to radiation, intra- and interrater variability, and the time spent on the assessment. The employment of automated methods such as deep learning and the use of magnetic resonance imaging (MRI) can address these drawbacks and improve the assessment of age. Objective: The aim of this paper is to propose an automated approach for age assessment of youth and young adults in the age range when the length growth ceases and growth zones are closed (14-21 years of age) by employing deep learning using MRI of the knee. Methods: This study carried out MRI examinations of the knee of 402 volunteer subjects-221 males (55.0%) and 181 (45.0%) females-aged 14-21 years. The method comprised two convolutional neural network (CNN) models: the first one selected the most informative images of an MRI sequence, concerning age-assessment purposes; these were then used in the second module, which was responsible for the age estimation. Different CNN architectures were tested, both training from scratch and employing transfer learning. Results: The CNN architecture that provided the best results was GoogLeNet pretrained on the ImageNet database. The proposed method was able to assess the age of male subjects in the range of 14-20.5 years, with a mean absolute error (MAE) of 0.793 years, and of female subjects in the range of 14-19.5 years, with an MAE of 0.988 years. Regarding the classification of minors-with the threshold of 18 years of age-an accuracy of 98.1% for male subjects and 95.0% for female subjects was achieved. Conclusions: The proposed method was able to assess the age of youth and young adults from 14 to 20.5 years of age for male subjects and 14 to 19.5 years of age for female subjects in a fully automated manner, without the use of ionizing radiation, addressing the drawbacks of traditional methods. © 2019 Journal of Medical Internet Research. All rights reserved.

  • Peng, Cong
    et al.
    Blekinge Institute of Technology, Faculty of Computing, Department of Computer Science.
    Goswami, Prashant
    Blekinge Institute of Technology.
    Bai, Guohua
    Blekinge Institute of Technology, Faculty of Computing, Department of Computer Science.
    A literature review of current technologies on health data integration for patient-centered health management2019In: Health Informatics Journal, ISSN 1460-4582, E-ISSN 1741-2811Article, review/survey (Refereed)
    Abstract [en]

    Health data integration enables a collaborative utilization of data across different systems. It not only provides a comprehensive view of a patient’s health but can also potentially cope with challenges faced by the current healthcare system. In this literature review, we investigated the existing work on heterogeneous health data integration as well as the methods of utilizing the integrated health data. Our search was narrowed down to 32 articles for analysis. The integration approaches in the reviewed articles were classified into three classifications, and the utilization approaches were classified into five classifications. The topic of health data integration is still under debate and problems are far from being resolved. This review suggests the need for a more efficient way to invoke the various services for aggregating health data, as well as a more effective way to integrate the aggregated health data for supporting collaborative utilization. We have found that the combination of Web Application Programming Interface and Semantic Web technologies has the potential to cope with the challenges based on our analysis of the review result.

  • Andersson, Martin
    et al.
    Blekinge Institute of Technology, Faculty of Engineering, Department of Industrial Economics.
    Larsson, Johan
    University of Cambridge, GBR.
    Wernberg, Joakim
    Entreprenörskapsforum, SWE.
    Stora kunskapsintensiva investeringar: orsaker, verkan och den offentliga sektorns roll2019Report (Other academic)
    Abstract [en]

    This report presents a definition of large knowledge-intensive investments (LKI). It then surveys research on the drivers as well as effects of LKI, and provides conclusions with regards to the conditions for, and role of, public policy in promoting such investments. The purpose is to provide the Swedish government with evidence and knowledge to support and develop the government’s work on supporting innovation and structural change of businesses in Sweden.

  • Bertoni, Marco
    et al.
    Blekinge Institute of Technology, Faculty of Engineering, Department of Mechanical Engineering.
    Bertoni, Alessandro
    Blekinge Institute of Technology, Faculty of Engineering, Department of Mechanical Engineering.
    Measuring Experiential Learning: An Approach Based on Lessons Learned Mapping2020In: Education Sciences, E-ISSN 2227-7102, Vol. 10, no 1, article id 11Article in journal (Refereed)
    Abstract [en]

    Fostering ‘experiential learning’ in real-life situations is a critical task for engineering educators when creating constructively aligned learning activities. The paper proposes an approach to measure the students’ perception of learning in Conceive-Design-Implement-Operate activities conducted outside the classroom. The approach is based on the opportunity of gathering and analyzing lessons learned from the student reflection reports at the end of a team-based innovation project performed in collaboration with company partners. The approach is intended to provide a basis for the future development of innovation projects with engineering students, supporting the definition of learning outcomes that are relevant for the CDIO Syllabus 2.0, and of constructively aligned learning experiences. The paper exemplifies the approach with regards to a master course named Value Innovation and presents the findings obtained at the third and second level of the CDIO Syllabus 2.0. The results of the course implementation show how short team-based innovation projects largely contributed in developing social and communication-related skills in engineering students, going beyond the mere application of their technical skills.

  • Sigvant, Mats
    et al.
    Blekinge Institute of Technology, Faculty of Engineering, Department of Mechanical Engineering.
    Pilthammar, Johan
    Blekinge Institute of Technology, Faculty of Engineering, Department of Mechanical Engineering.
    Hol, Johan
    TriboForm Engineering, NLD.
    Wiebenga, J. H.
    TriboForm Engineering, NLD.
    Chezan, Toni
    Tata Steel Europe Limited, GBR.
    Carleer, Bart
    AutoForm Engineering, DEU.
    van den Boogaard, Ton
    University of Twente, NLD.
    Friction in sheet metal forming: Influence of surface roughness and strain rate on sheet metal forming simulation results2019In: Procedia Manufacturing, Elsevier B.V. , 2019, p. 512-519Conference paper (Refereed)
    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. These friction conditions are then dependent on the tribology system, i.e. the applied sheet material, coating and tooling material, the lubrication and process conditions. Although friction is of key importance, it is currently not considered in detail in sheet metal forming simulations. The current industrial standard is to use a constant (Coulomb) coefficient of friction, which limits the overall simulation accuracy. Since a few years, back there is an ongoing collaboration on friction modelling between Volvo Cars, Tata Steel, TriboForm Engineering, AutoForm Engineering and the University of Twente. In previous papers by the authors, results from lab scale studies and studies of body parts at Volvo Cars, both parts in early tryout for new car models as well as parts in production have been presented. However, the introduction of a new friction model in the sheet metal forming simulations forces the user to gain knowledge about accurate values for new input parameters and question current modeling assumptions. This paper presents results from studies on the influence on the sheet metal forming simulation results from stamping die surface roughness and introduction of strain rate sensitivity in the sheet material model. The study will use a FE-model of a part presented in previous papers. © 2019 The Authors. Published by Elsevier B.V.

  • Silvander, Johan
    et al.
    Blekinge Institute of Technology, Faculty of Computing, Department of Software Engineering.
    Angelin, Lars
    Ericsson AB, SWE.
    Introducing intents to the OODA-loop2019In: Procedia Computer Science, Elsevier B.V. , 2019, p. 878-883Conference paper (Refereed)
    Abstract [en]

    Together with Ericsson AB, we are using the design science framework when investigating how to create an intent-driven system for their business support system and its business studio. The aim is to present our initial results on how an extended OODA-loop can be used to realize a robust, but still flexible, software architecture for an intent-driven system. We explain how an extended OODA-loop is constructed and provide suggestions of how different part of it can be implemented. The initial results are promising but further research is needed to use the extended OODA-loop as reusable components in intent-driven systems. Our next step is to extend the generic methods with knowledge representation and reasoning capabilities. © 2019 The Author(s). Published by Elsevier B.V.

  • Islam, Md Shafiqul
    et al.
    Blekinge Institute of Technology, Faculty of Engineering, Department of Mechanical Engineering. Blekinge Institute of Technology.
    Alfredsson, Svante
    Univ Skovde, SWE.
    Peeling of metal foil from a compliant substrate2019In: The journal of adhesion, ISSN 0021-8464, E-ISSN 1563-518XArticle in journal (Refereed)
    Abstract [en]

    Large displacement peel was studied for cases where a compliant substrate leads to a large value of the root rotation. An existing simplified beam model to calculate the peel fracture energy was modified to allow for a kinematic hardening beam model of the foil. The steady-state peel force and the root rotation were used as input data to the resulting analytical beam model. Test results from the literature were analysed. A more elaborate finite element model was also studied, using cohesive elements for the interface layer between the foil and the substrate. The cohesive zone parameters used were the fracture energy, the cohesive strength and a shape parameter. An optimization scheme for the cohesive zone parameters was developed and optimized against experimental steady-state peel force and root rotation. The optimization scheme was effective to characterize the cohesive parameters. The method yields similar values of fracture energy for the two peel angles, with the one for 180degree being slightly higher than for 90degree. The difference in fracture energies for different peel angles suggests that the fracture energy can be mode dependent.

  • Public defence: 2020-02-14 09:30
    Villamil Velasquez, Denny Carolina
    Blekinge Institute of Technology, Faculty of Engineering, Department of Strategic Sustainable Development.
    Integration of Sustainability Aspects in Product Portfolio2020Licentiate thesis, comprehensive summary (Other academic)
    Abstract [en]

    Several environmental issues are incrementing systematically, and many of them are linked to manufacturing activities. To mitigate these issues, it is necessary to develop sustainability solutions in the early stages of the innovation process, where there is room for creativity and innovation. The integration of sustainability at the strategic level of the company, where the essential decisions, the strategic plan, and the portfolio are developed, might ensure the implementation of sustainability aspects in products and services. Many companies develop product portfolios to organize and offer services, products, technologies and operations following the company strategy and targets. The portfolio components are assessed and selected using evaluation criteria. The most common criteria include: cost, quality, risk, revenue, time and market position. Usually sustainability is not included in the portfolio evaluation criteria.

    The aim of this research is to obtain a better understanding of how sustainability can be integrated in the product portfolio development of manufacturing companies. The main research targets are to: 1) define sustainability product portfolio based on a comprehension of the academic and industry perspectives, 2) identify how companies currently implement sustainability in their portfolio, 3) determine which evaluation criteria and tools are used for portfolio development and 4) how the product portfolio is developed, implemented and managed.

    A systematic literature review was performed to understand the state of the art about sustainability product portfolio. The literature review results supported the development of semi-structure interviews with companies and field experts. The interviews outcome provided a better understanding of the industry perspective. Afterwards, a workshop helped to understand what aspects are more significant for the portfolio evaluation criteria. Finally, a strategic sustainability assessment tool SLCA 2.0 was used to assess a technology product portfolio of a specific industry case.

    The results from the studies created a foundation to: a) determine the state of art of the sustainability product portfolio field and its relevance for integration and implementation of sustainability in the early stages of the product innovation process, b) define the concept of sustainability product portfolio, c) have a better understanding of the setting and the application of the portfolio evaluation criteria and how to include sustainability in the evaluation, d) identify key factors to integrate and implement sustainability in the product portfolio, e) apply and test a tool for assessing a technology portfolio from a sustainability perspective and f) create a prototype of a model to develop  the product portfolio with a strategic sustainability perspective.

    This research provides a knowledge foundation of how sustainability can be integrated in product portfolio. In future research a model will be developed to support companies of how to include a strategic sustainability perspective into their product portfolio to enhance development of more sustainable solutions.

     

  • Wagner, Stefan
    Blekinge Institute of Technology, Faculty of Engineering, Department of Mathematics and Natural Sciences. Blekinge Tekniska Hgsk, Karlskrona, Sweden..
    SECONDARY CHARACTERISTIC CLASSES OF LIE ALGEBRA EXTENSIONS2019In: Bulletin de la Société Mathématique de France, ISSN 0037-9484, E-ISSN 2102-622X, Vol. 147, no 3, p. 443-453Article in journal (Refereed)
    Abstract [en]

    We introduce the notion of secondary characteristic classes of Lie algebra extensions. As an application of our construction we obtain a new proof of Lecomte's generalization of the Chern-Weil homomorphism.

  • Tatipala, Sravan
    et al.
    Blekinge Institute of Technology, Faculty of Engineering, Department of Mechanical Engineering.
    Wall, Johan
    Blekinge Institute of Technology, Faculty of Engineering, Department of Mechanical Engineering.
    Johansson, Christian
    Blekinge Institute of Technology, Faculty of Engineering, Department of Mechanical Engineering.
    Larsson, Tobias
    Blekinge Institute of Technology, Faculty of Engineering, Department of Mechanical Engineering.
    A hybrid data- and model-based approach to process monitoring and control in sheet metal forming2020In: Processes, ISSN 2227-9717, Vol. 8, no 1, article id 89Article in journal (Other academic)
    Abstract [en]

    The ability to predict and control the outcome of the sheet metal forming process demands holistic knowledge of the product/process parameter influences and their contribution in shaping the output product quality. Recent improvements in the ability to harvest in-line production data and the increased capability to understand complex process behaviour through computer simulations open up the possibility for new approaches to monitor and control production process performance and output product quality. This research presents an overview of the common process monitoring and control approaches while highlighting their limitations in handling the dynamics of the sheet metal forming process. The current paper envisions the need for a collaborative monitoring and control system for enhancing production process performance. Such a system must incorporate comprehensive knowledge regarding process behaviour and parameter influences in addition to the current-system-state derived using in-line production data to function effectively. Accordingly, a framework for monitoring and control within automotive sheet metal forming is proposed. The framework addresses the current limitations through the use of real-time production data and reduced process models. Lastly, the significance of the presented framework in transitioning to the digital manufacturing paradigm is reflected upon.

  • Briggs, Sarah Jayne
    et al.
    Keele Univ, GBR.
    Robinson, Zoe P.
    Keele Univ, GBR.
    Hadley, Rachel Louise
    Keele Students Union, GBR.
    Laycock Pedersen, Rebecca
    Blekinge Institute of Technology, Faculty of Engineering, Department of Strategic Sustainable Development.
    The importance of university, students and students' union partnerships in student-led projects: A case study2019In: International Journal of Sustainability in Higher Education, ISSN 1467-6370, E-ISSN 1758-6739, Vol. 20, no 8, p. 1409-1427Article in journal (Refereed)
    Abstract [en]

    Purpose This paper aims to explore a single-institution case study of partnership working between students, the University and Students' Union, through four student-led sustainability projects. The paper analyses the role and value of these partnerships and provides advice for other institutions on effective partnership working between these stakeholders. Design/methodology/approach A single case study of partnership working with multiple embedded units of analysis (four projects) is presented based on reflections of practitioners involved in the projects who have different roles within the University and Students' Union. Findings The longevity and effectiveness of student-led projects, and disciplinary-breadth of students engaged, can be enhanced by greater collaboration with, and integration into, University and Students' Union systems. Partnership working between different stakeholders is key to overcoming challenges and the success of student-led projects, helped by key staff "enablers". These projects provide myriad learning opportunities for developing change agency skills, even where projects are relatively short-lived and could be seen as failures in terms of longevity. Originality/value This paper draws together the experiences and reflections of four practitioners with different roles within the University and Students' Union across four different projects and provides advice to generate student-led sustainability projects which have longevity and impact for wider student populations and future generations of cohorts.

  • Kang, Yuchi
    et al.
    Kunming Univ Sci & Technol, CHN.
    Liu, Meihong
    Kunming Univ Sci & Technol, CHN.
    Hu, Xiangping
    Norwegian Univ Sci & Technol, NOR.
    Kao-Walter, Sharon
    Blekinge Institute of Technology, Faculty of Engineering, Department of Mechanical Engineering.
    Zhang, Baodi
    Kunming Univ Sci & Technol, CHN.
    Theoretical and numerical investigation into brush seal hysteresis without pressure differential2019In: Advanced Composites Letters, ISSN 0963-6935, Vol. 28, article id UNSP 0963693519885386Article in journal (Refereed)
    Abstract [en]

    Brush seal is a novel type contact seal, and it is well-known due to its excellent performance. However, there are many intrinsic drawbacks, such as hysteresis, which need to be solved. This article focused on modeling hysteresis in both numerical way and analytic way without pressure differential. The numerical simulation was solved by the finite element method. General contact method was used to model the inter-bristle contact, bristle-rotor contact, and bristle-backplate contact. Bristle deformation caused by both vertical and axial tip force was used to validate the numerical model together with reaction force. An analytic model in respect of the strain energy was created. The influence of structure parameters on the hysteresis ratio, with the emphasis on the derivation of hysteresis ratio formula for brush seals, was also presented. Both numerical model and analytic model presented that cant angle is the most influential factor. The aim of the article is to provide a useful theoretical and numerical method to analyze and predict the hysteresis. This work contributes the basis for future hysteresis investigation with pressure differential.

  • Ongong'a, Elvice
    et al.
    Mälardalens högskola, SWE.
    Richter, Johan
    Blekinge Institute of Technology, Faculty of Engineering, Department of Mathematics and Natural Sciences.
    Silvestrov, Sergei
    Mälardalens högskola, SWE.
    Hom-Lie structures on 3-dimensional skew symmetric algebras2019In: Journal of Physics: Conference Series, Institute of Physics Publishing (IOPP), 2019, Vol. 1416, p. 012025-Conference paper (Refereed)
    Abstract [en]

    We describe the dimension of the space of possible linear endomorphisms that turn skew-symmetric three-dimensional algebras into Hom-Lie algebras. We find a correspondence between the rank of a matrix containing the structure constants of the bilinear product and the dimension of the space of Hom-Lie structures. Examples from classical complex Lie algebras are given to demonstrate this correspondence.

  • Linde, Peter
    Blekinge Institute of Technology, The Library.
    BTH Newsletter on Science Publishing and Open Access Issues: December 20192019Other (Other (popular science, discussion, etc.))