Change search
Link to record
Permanent link

Direct link
BETA
Wall, Johan
Publications (10 of 17) Show all publications
Wall, J., Bertoni, M. & Larsson, T. (2018). A model-driven decision arena: Augmenting decision making in early design. In: Norddesign conference proceedings: . Paper presented at NordDesign, Linköping. The Design Society
Open this publication in new window or tab >>A model-driven decision arena: Augmenting decision making in early design
2018 (English)In: Norddesign conference proceedings, The Design Society, 2018Conference paper, Published paper (Refereed)
Abstract [en]

A wide variety of expert competencies, transcending traditional disciplines, are needed to foresee and evaluate the impact of decisions in the conceptual phase of engineering design. Where this previously was a trade-off regarding design and development of the pure physical artefact it is now a complex ambiguity game involving all disciplines touching a solution during its lifecycle, due to the movement towards integrated product-service solutions. Gathering the involved, normally diverse, group of stakeholders in a collaborative setting for design exploration exercises, sharing knowledge and values, is believed to augment decision making ability in early design. A model-driven environment for collaborative decision making is proposed as a solution that potentially may help harvesting these benefits. In this environment stakeholders interact with each other using digital models, model generated information, simulation data and product data collected in the field in order to evaluate design proposals by playing out potential usage scenarios and investigating cause and effect relationships. Initial work on conceptualizing, developing, and testing such an environment is done through a pilot study based on two industrial use cases. The development process iteratively unveils demands and constraints related to the environment. These discoveries go hand in hand with developing an infrastructure regarding both hardware and software as well as required human resources in a functional environment. Fully realizing the envisioned model-driven environment for collaborative decision making entails new ways of working requiring new knowledge as well as technological innovation. In that aspect, environment infrastructure and usage are elaborated on and direction for further research and development is indicated.

Place, publisher, year, edition, pages
The Design Society, 2018
Keywords
Model-driven design, Conceptual design, Design exploration, Visualization, Multi-stakeholder, Decision making, Digitalisation
National Category
Other Mechanical Engineering
Identifiers
urn:nbn:se:bth-16163 (URN)
Conference
NordDesign, Linköping
Funder
Knowledge Foundation
Available from: 2018-05-09 Created: 2018-05-09 Last updated: 2018-06-27Bibliographically approved
Tatipala, S., Pilthammar, J., Sigvant, M., Wall, J. & Johansson, C. (2018). Introductory study of sheet metal forming simulations to evaluate process robustness. In: Journal of Physics: Conference Series (JPCS), Institute of Physics Publishing (IOPP), 2018.: . Paper presented at 37th IDDRG Conference - Forming of High Performance Sheet Materials and Components, Waterloo, Canada..
Open this publication in new window or tab >>Introductory study of sheet metal forming simulations to evaluate process robustness
Show others...
2018 (English)In: Journal of Physics: Conference Series (JPCS), Institute of Physics Publishing (IOPP), 2018., 2018Conference paper, Published paper (Refereed)
Abstract [en]

The ability to control quality of a part is gaining increased importance with desires to achieve zero-defect manufacturing. Two significant factors affecting process robustness in production of deep drawn automotive parts are variations in material properties of the blanks and the tribology conditions of the process. It is imperative to understand how these factors influence the forming process in order to control the quality of a formed part. This paper presents a preliminary investigation on the front door inner of a Volvo XC90 using a simulation-based approach. The simulations investigate how variation of material and lubrication properties affect the numerical predictions of part quality. To create a realistic lubrication profile in simulations, data of pre-lube lubrication amount, which is measured from the blanking line, is used. Friction models with localized friction conditions are created using TriboForm and is incorporated into the simulations. Finally, the Autoform-Sigmaplus software module is used to create and vary parameters related to material and lubrication properties within a user defined range. On comparing and analysing the numerical investigation results, it is observed that a correlation between the lubrication profile and the predicted part quality exists. However, variation in material properties seems to have a low influence on the predicted part quality. The paper concludes by discussing the relevance of such investigations for improved part quality and proposing suggestions for future work.

Keywords
Sheet Metal Forming, Friction Modelling, Process Robustness, Zero Defect Manufacturing, Industry 4.0, Digitization, Production Engineering.
National Category
Mechanical Engineering
Identifiers
urn:nbn:se:bth-16613 (URN)
Conference
37th IDDRG Conference - Forming of High Performance Sheet Materials and Components, Waterloo, Canada.
Projects
Model Driven Development and Decision Support
Funder
Knowledge Foundation
Available from: 2018-06-23 Created: 2018-06-23 Last updated: 2018-06-27Bibliographically approved
Bertoni, M., Wall, J. & Bertoni, A. (2018). Model Driven Decision Arena: an aerospace study. In: D. Marjanović, M. Štorga, S. Škec, N. Bojčetić, N. Pavković (eds.) (Ed.), Proceedings of the International Design Conference: . Paper presented at International Design Conference (DESIGN 2018), Dubrovnik (pp. 171-182). The Design Society
Open this publication in new window or tab >>Model Driven Decision Arena: an aerospace study
2018 (English)In: Proceedings of the International Design Conference / [ed] D. Marjanović, M. Štorga, S. Škec, N. Bojčetić, N. Pavković (eds.), The Design Society, 2018, p. 171-182Conference paper, Published paper (Refereed)
Abstract [en]

The concept of Decision Theatre (DT) is of great interest to leverage knowledge sharing in early stage design decision events. Yet, few contributions show how to configure a DT to support design space exploration and concept selection in cross-functional teams. This paper describes the development of a model-driven decision arena (MDDA) for aero-engine sub-system design. After presenting the descriptive study findings, it illustrates the overall logic of the MDDA environment and exemplifies its use in a case study related to the design of a turbine real structure (TRS) for commercial use.

Place, publisher, year, edition, pages
The Design Society, 2018
Keywords
decision theatre, visualisation, case study, value driven design, collaborative design
National Category
Other Mechanical Engineering
Identifiers
urn:nbn:se:bth-16215 (URN)10.21278/idc.2018.0326 (DOI)
Conference
International Design Conference (DESIGN 2018), Dubrovnik
Projects
MODEL DRIVEN DEVELOPMENT AND DECISION SUPPORT (MD3S)
Funder
Knowledge Foundation
Available from: 2018-05-23 Created: 2018-05-23 Last updated: 2018-05-24Bibliographically approved
Jaghbeer, Y., Hallstedt, S., Larsson, T. & Wall, J. (2017). Exploration of Simulation-Driven Support Tools for Sustainable Product Development. In: Tim C. McAloone, Daniela C.A. Pigosso, Niels Henrik Mortensen and Yoshiki Shimomura (Ed.), Procedia CIRP: . Paper presented at 9th CIRP Conference on Industrial Product/Service-Systems (IPSS), Copenhagen (pp. 271-276). Elsevier, 64
Open this publication in new window or tab >>Exploration of Simulation-Driven Support Tools for Sustainable Product Development
2017 (English)In: Procedia CIRP / [ed] Tim C. McAloone, Daniela C.A. Pigosso, Niels Henrik Mortensen and Yoshiki Shimomura, Elsevier, 2017, Vol. 64, p. 271-276Conference paper, Published paper (Refereed)
Abstract [en]

Global society is encountering many challenges such as climate change, resource depletion, etc., which comes with a set of challenges and opportunities for businesses. Applied research in operational tools and methods that support sustainable product- and service systems innovation, aims to strengthen businesses to overcome these challenges. In recent years, several tools and methods have been developed in the sustainable product development field with focus on modelling and digitalization. This paper explores how sustainability has been integrated in modelling and simulation, and presents results from a literature review with the purpose of highlighting opportunities and challenges in the field. Furthermore, an initial model-based engineering support toolbox (MBE) is presented, with focus on support tools for socio-ecological sustainability integration in the early product development stages.

Place, publisher, year, edition, pages
Elsevier, 2017
Series
Procedia CIRP, ISSN 2212-8271
Keywords
Sustainable product development; simulation-driven models; support tools; sustainable PSS
National Category
Other Mechanical Engineering
Identifiers
urn:nbn:se:bth-14451 (URN)10.1016/j.procir.2017.03.069 (DOI)000414528200046 ()
Conference
9th CIRP Conference on Industrial Product/Service-Systems (IPSS), Copenhagen
Projects
Model Driven Development and Decision Support - MD3S
Funder
Knowledge Foundation
Available from: 2017-06-09 Created: 2017-06-09 Last updated: 2018-01-16Bibliographically approved
Pilthammar, J., Wall, J. & Sigvant, M. (2017). Framework for Simulation-Driven Design of Stamping Dies Considering Elastic Die and Press Deformations. In: Brabazon D.,Ul Ahad I.,Naher S. (Ed.), PROCEEDINGS OF THE 20TH INTERNATIONAL ESAFORM CONFERENCE ON MATERIAL FORMING (ESAFORM 2017): . Paper presented at 20th International ESAFORM Conference on Material Forming, Dublin. American Institute of Physics (AIP), 1896, Article ID 010001.
Open this publication in new window or tab >>Framework for Simulation-Driven Design of Stamping Dies Considering Elastic Die and Press Deformations
2017 (English)In: PROCEEDINGS OF THE 20TH INTERNATIONAL ESAFORM CONFERENCE ON MATERIAL FORMING (ESAFORM 2017) / [ed] Brabazon D.,Ul Ahad I.,Naher S., American Institute of Physics (AIP), 2017, Vol. 1896, article id 010001Conference paper, Published paper (Refereed)
Abstract [en]

Sheet metal forming (SMF) simulations are used extensively throughout the development phase of industrialstamping dies. In these SMF simulations, the die and press are normally considered as rigid. Previous research has howevershown that elastic deformation in these parts has a significant negative impact on process performance. This paperdemonstrates methods for counteracting these negative effects, with a high potential for improved production support anda reduced lead time through a shorter try-out process. A structural finite element model (FE-model) of a simplified die isstudied. To account for elastic deformation, the blankholder surfaces are first virtually reworked by adjusting the nodalpositions on the die surfaces attaining a pressure distribution in accordance to the design phase SMF simulations with rigidsurfaces. The elastic FE-model with reworked surfaces then represents a stamping die in running production. The die isnow assumed to be exposed to changed process conditions giving an undesired blankholder pressure distribution. Thechanged process conditions could for example be due to a change of press line. An optimization routine is applied tocompensate the negative effects of the new process conditions. The optimization routine uses the contact forces acting onthe shims of the spacer blocks and cushion pins as optimization variables. A flexible simulation environment usingMATLAB and ABAQUS is used. ABAQUS is executed from MATLAB and the results are automatically read back intoMATLAB. The suggested optimization procedure reaches a pressure distribution very similar to the initial distributionassumed to be the optimum, and thereby verifying the method. Further research is needed for a method to transform thecalculated forces in the optimization routine back to shims thicknesses. Furthermore, the optimization time is relativelylong and needs to be reduced in the future for the method to reach its full potential.

Place, publisher, year, edition, pages
American Institute of Physics (AIP), 2017
Series
AIP Conference Proceedings, ISSN 0094-243X
National Category
Applied Mechanics
Identifiers
urn:nbn:se:bth-15392 (URN)10.1063/1.5008124 (DOI)000419825000167 ()9780735415805 (ISBN)
Conference
20th International ESAFORM Conference on Material Forming, Dublin
Funder
VINNOVA, 2016-03324
Available from: 2017-10-30 Created: 2017-10-30 Last updated: 2018-01-25Bibliographically approved
Massimo, P., Wall, J. & Larsson, T. (2017). Simulation-driven design for assessing strategic decisions in the conceptual design of circular PSS business models. In: Procedia CIRP: The 9th CIRP IPSS Conference: Circular Perspectives on Product/Service-Systems. Paper presented at 9th CIRP Conference on Industrial Product/Service-Systems (IPSS), Copenhagen (pp. 25-30). Elsevier, 64
Open this publication in new window or tab >>Simulation-driven design for assessing strategic decisions in the conceptual design of circular PSS business models
2017 (English)In: Procedia CIRP: The 9th CIRP IPSS Conference: Circular Perspectives on Product/Service-Systems, Elsevier, 2017, Vol. 64, p. 25-30Conference paper, Published paper (Refereed)
Abstract [en]

Due to ever increasing challenges faced by our global society, circular design and the idea of product-service systems (PSS) isgaining traction within businesses. However, ‘predicting’ the value of a future PSS solution in the early design phases is difficult,since it requires the ability to balance long term potential with short term decisions. Modelling and simulation is believed to beable to support this challenging task. A simulation framework for circular design of PSS is presented. The simulation processenables the comparison between functional and non-functional performances and their life cycle contributions depending on adefined PSS-like business model strategy. Such integrated simulation framework is intended to exploit engineering modelsoutside their specific discipline, enabling cross-functional collaboration and help decision makers understand how a design cancontribute in satisfying customer and stakeholders needs during the lifecycle of a PSS.

Place, publisher, year, edition, pages
Elsevier, 2017
Series
Procedia CIRP, ISSN 2212-8271
Keywords
Simulation-driven design, circular economy, product-service systems, multidiscplinary decision-making
National Category
Mechanical Engineering
Identifiers
urn:nbn:se:bth-14411 (URN)10.1016/j.procir.2017.03.026 (DOI)000414528200005 ()
Conference
9th CIRP Conference on Industrial Product/Service-Systems (IPSS), Copenhagen
Projects
Model Driven Development and Decision Support
Funder
Knowledge Foundation
Note

open access

Available from: 2017-06-07 Created: 2017-06-07 Last updated: 2017-11-24Bibliographically approved
Byggeth, S., Ny, H., Wall, J., Broman, G. & Robèrt, K.-H. (2007). Introductory Procedure for Sustainability-Driven Design Optimization. In: : . Paper presented at International Conference on Engineering Design (ICED). Paris: The Design Society
Open this publication in new window or tab >>Introductory Procedure for Sustainability-Driven Design Optimization
Show others...
2007 (English)Conference paper, Published paper (Refereed)
Abstract [en]

In response to the increasingly competitive global market, there is a growing interest in design optimization. Being able to include aspects of socio-ecological sustainability in product design should aid companies to both improve current competitiveness and to identify viable long-term investment paths and new business opportunities in the evolving sustainability-driven market. A case study of a water jet cutting machine is used to illustrate a new iterative optimization procedure that combines a technical assessment with a sustainability assessment. Sustainability assessment methods/tools are first used to identify prominent sustainability problems from present-day flows and practices (“societal indicators”) and to generate ideas of long-term solutions and visions. Based on this, preliminary ideas about likely desirable changes in machine properties are obtained. Technical investigations are then performed to assess if/how these particularly desirable changes in machine properties could in principle be realized through changes in design variables. After that, obtainable changes are fed back to a new and more refined sustainability assessment to find out the societal implications of these changes. This may in turn result in other desirable design changes, which may call for a new and more refined technical assessment, etcetera. The experience from the case study indicates that the suggested integrated and iterative working procedure should be able to add information about socio-ecological impacts of product properties and influence design criteria used in prioritisation situations during product development.

Abstract [sv]

På den konkurrensinriktade globala marknaden blir konstruktionsoptimering alltmer intressant. Att kunna inkludera socio-ekologiska hållbarhetsaspekter i produktutveckling borde hjälpa företag både att förbättra både kortsiktig konkurrenskraft och att identifiera långsiktiga affärsmöjligheter på den framväxande hållbarhetsdrivna marknaden. En fallstudie över en vattenskärningsmaskin används för att illustrera en nytt iterativt optimerande arbetssätt som kombinerar både tekniska och hållbarhetsmässiga analyser. Erfarenheterna från fallstudien pekar på att det föreslagna iterativa arbetssättet lyckades inkludera information om produktens socio-ekologiska hållbarhetseffekter. Konstruktionskriterier kunde också påverkas på ett konsekevent sätt och därmed styra produkutveklingen i en mer hållber riktning. Nyckelord: produktutvekling, optimering, hållbarhetsanalys, simulering, vattenskärning

Place, publisher, year, edition, pages
Paris: The Design Society, 2007
Keywords
product development, optimization, sustainability assessment, simulation, water jet cutting
National Category
Social Sciences Interdisciplinary Applied Mechanics
Identifiers
urn:nbn:se:bth-8710 (URN)oai:bth.se:forskinfoEC5685FF3E14851DC12573C9003B2BE2 (Local ID)1-904670-02-4 (ISBN)oai:bth.se:forskinfoEC5685FF3E14851DC12573C9003B2BE2 (Archive number)oai:bth.se:forskinfoEC5685FF3E14851DC12573C9003B2BE2 (OAI)
Conference
International Conference on Engineering Design (ICED)
Note

INTERNATIONAL CONFERENCE ON ENGINEERING DESIGN, ICED ’07 28-31 AUGUST 2007, CITE DES SCIENCES ET DE L’INDUSTRIE, PARIS, FRANCE (http://www.iced07.org/)

Available from: 2012-09-18 Created: 2008-01-07 Last updated: 2018-01-11Bibliographically approved
Wall, J. (2007). Simulation-Driven Design of Complex Mechanical and Mechatronic Systems. (Doctoral dissertation). Karlskrona: Blekinge Institute of Technology
Open this publication in new window or tab >>Simulation-Driven Design of Complex Mechanical and Mechatronic Systems
2007 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Effective and efficient product development is critical to business success on the increasingly competitive global market, and simulation has proven to support this in many sectors. The aim of this thesis is to study how properties of complex mechanical and mechatronic systems can be more efficiently and systematically predicted, described, assessed and improved in product development. The purpose is to elaborate an approach that can, rather than only verifying solutions that are already decided upon, support dialogues with customers, stimulate creation of new concepts and provide guidance towards more optimised designs, especially in early development stages. This is here termed simulation-driven design. To be useful for this, product models and simulation and optimisation procedures must be efficient, that is, they must accurately answer posed questions and point towards better solutions while consuming an acceptable amount of time and other resources. In this thesis a coordinated approach to create such efficient decision support is elaborated. This is done by action research through two industrial case studies; an automobile exhaust system representing a complex mechanical system and a water jet cutting machine representing a mechatronic system. The general knowledge gained from these case studies should be a good base for coming implementation of this approach as an inherent working routine in companies developing complex mechanical and mechatronic products. A specific result is a validated virtual model of the exhaust system, which facilitates fast structural dynamics simulation of customer proposed design layouts. It is also shown that the non-linear flexible joint between the manifold and the rest of the exhaust system makes the system behaviour complex. This has resulted in an additional general research question, namely how systems that are linear, except for small but significant non-linear parts, can be simulated in an efficient way. Another specific result is a validated real-time virtual machine concept for simulation of the water jet cutting machine, which facilitates early-stage design optimisation. As the mechanics and the control system are considered simultaneously, interaction effects can be utilised. An introductory optimisation study shows a significant potential for improved manufacturing accuracy and a more light-weight design. This potential would not likely have been found through a conventional sequential design approach. The results of this thesis indicate that there is a great potential for improved product development performance in small and medium-sized companies. By incorporating modern simulation support these companies can improve their competitiveness as well as contribute to improved resource efficiency of society at large. In doing so, it is important to find a good balance between model fidelity, validity and cost for achieving a relevant decision support. The coordinated approach to simulation-driven design elaborated in this thesis is a promising and systematic way of finding this balance.

Place, publisher, year, edition, pages
Karlskrona: Blekinge Institute of Technology, 2007. p. 184
Series
Blekinge Institute of Technology Doctoral Dissertation Series, ISSN 1653-2090 ; 2
Keywords
Exhaust system, Experimentation, Machine tools, Mechatronics, Optimisation, Product development, Prototyping, Simulation, Structural dynamics
National Category
Applied Mechanics
Identifiers
urn:nbn:se:bth-00346 (URN)oai:bth.se:forskinfoFFF7AF12199B7B3BC125724A004A733D (Local ID)978-91-7295-103-7 (ISBN)oai:bth.se:forskinfoFFF7AF12199B7B3BC125724A004A733D (Archive number)oai:bth.se:forskinfoFFF7AF12199B7B3BC125724A004A733D (OAI)
Available from: 2012-09-18 Created: 2006-12-20 Last updated: 2015-06-30Bibliographically approved
Jönsson, A., Wall, J. & Broman, G. (2005). A Virtual Machine Concept for Real-Time Simulation of Machine Tool Dynamics. International journal of machine tools & manufacture, 45(7), 795-801
Open this publication in new window or tab >>A Virtual Machine Concept for Real-Time Simulation of Machine Tool Dynamics
2005 (English)In: International journal of machine tools & manufacture, ISSN 0890-6955, E-ISSN 1879-2170, Vol. 45, no 7, p. 795-801Article in journal (Refereed) Published
Abstract [en]

When designing CNC machine tools it is important to consider the dynamics of the control, the electrical components and the mechanical structure of the machine simultaneously. This paper describes the structure and implementation of a concept for real-time simulation of such machine tools using a water jet cutting machine as an application. The concept includes a real control system, simulation models of the dynamics of the machine and a virtual reality model for visualisation. The real-time capability of the concept, including the simulation of electrical and rather detailed mechanical component models is proofed. The validation process indicates good agreement between simulation and measurement, but suggests further studies on servo motor, connection and flexibility modelling. However, already from the initial simulation results presented in this paper it can be concluded that the influence of structural flexibility on manufacturing accuracy is of importance at desired feeding rates and accelerations. The fully automated implementation developed in this work is a promising base for dealing with this trade-off between productivity and accuracy of the manufacturing process through multidisciplinary optimisation.

Place, publisher, year, edition, pages
Elsevier, 2005
Keywords
Dynamics, Machine Tools, Mechatronics, Real-Time Simulation, Virtual Machine
National Category
Applied Mechanics
Identifiers
urn:nbn:se:bth-9744 (URN)000228207300007 ()oai:bth.se:forskinfo98F385AEED470C9AC1256F5700465EE3 (Local ID)oai:bth.se:forskinfo98F385AEED470C9AC1256F5700465EE3 (Archive number)oai:bth.se:forskinfo98F385AEED470C9AC1256F5700465EE3 (OAI)
Available from: 2012-09-18 Created: 2004-11-25 Last updated: 2017-12-04Bibliographically approved
Englund, T., Wall, J., Ahlin, K. & Broman, G. (2004). Dynamic characteristics of a combined bellows and liner flexible joint. Journal of Automobile Engineering, 218(5), 485-493
Open this publication in new window or tab >>Dynamic characteristics of a combined bellows and liner flexible joint
2004 (English)In: Journal of Automobile Engineering, ISSN 0954-4070 , Vol. 218, no 5, p. 485-493Article in journal (Refereed) Published
Abstract [en]

A bellows combined with an inside liner and an outside braid is commonly used as a flexible joint in automobile exhaust systems to reduce transmission of engine movements to the exhaust system. It greatly influences the dynamics of the complete system. Understanding of its dynamic characteristics and a modelling method that facilitates systems simulation are therefore desired. This has been obtained in earlier works for the bellows itself. In this work an approach to the modelling of the combined bellows and liner joint is suggested and experimentally verified. Simulations and measurements show that the liner adds significant non-linearity and makes the characteristics of the joint complex. Results are presented for the axial and the bending load cases. In torsion, influence of the liner is negligible. Peak responses are significantly reduced when the excitation level approximately corresponds to the friction limit of the liner. The complexity of the combined bellows and liner joint is important to know of and consider in exhaust system design and proves the necessity of including a model of the liner in the theoretical joint model when this type of liner is present in the real joint to be simulated.

Place, publisher, year, edition, pages
Professional Engineering Publishing, 2004
Keywords
beam model, dynamic, experimental investigation, flexible joint, friction, liner, non-linear
National Category
Applied Mechanics
Identifiers
urn:nbn:se:bth-9798 (URN)000221990000002 ()oai:bth.se:forskinfo8DD4EB725D35D901C125707B002CB21F (Local ID)oai:bth.se:forskinfo8DD4EB725D35D901C125707B002CB21F (Archive number)oai:bth.se:forskinfo8DD4EB725D35D901C125707B002CB21F (OAI)
Available from: 2012-09-18 Created: 2005-09-13 Last updated: 2015-06-30Bibliographically approved
Organisations

Search in DiVA

Show all publications