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Constraint-based conceptual design using principle solution elements
Linköping University, Department of Mechanical Engineering, Machine Design. Linköping University, The Institute of Technology.
2005 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The design of new products is an important engineering activity, and much of the competitiveness in high-salary countries depends on the ability to develop innovative products with acceptable time to market.

During conceptual design, the principle solution for a product is conceived. This early phase of a systematic design process is of great importance for the later success of products. Available design support tools are mainly oriented towards the later phase of embodiment design (e.g. volume modellers), and they do not effectively support conceptual design. This work presents an information model, methods, and a tool for computer-supported conceptual design.

During conceptual design, creative steps and the modelling of function structures, hierarchies, solution principles and concepts must be supported in order to reduce the considerable time needed by systematic design methods.

Literature as well as existing research prototypes have been analysed to determine the state of the art in research regarding computer-supported conceptual design. Design projects of master's degree engineering students, previously carried-out at the division, have been studied in order to gain insight into the needs and possibilities of supporting concept generation for various design tasks.

The work has resulted in a parametric, feature-based information model that is able to describe concepts as choices of principle solution elements and their quantification by value assignments. The model operates on a higher semantic level than for example document or model files by applying a constraint network that connects parameters of requirements, function structure, F/M tree, solution principles and concepts. The model has been tailored towards easy exchangeability of principle solution elements by a division into different constraint types, of which internal constraints are directly reusable. Using the model, the co-evolution of concept synthesisand early calculations is facilitated.

The presented information model has been implemented in a prototype of an interactive tool for computer-supported conceptual design. The tool includes a graphical user interface for work with views for function structures and F/M trees. Reuse is enabled by storing and re-inserting principle solution elements from a database.

Place, publisher, year, edition, pages
Linköping: Linköpings universitet, Department of Mechanical Engineering , 2005. , 197 p.
Series
Linköping Studies in Science and Technology. Dissertations, ISSN 0345-7524 ; 930
Keyword [en]
Conceptual design, functional modelling, constraint-based design, design reuse, VDI 2222, product modelling, design support
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:liu:diva-24463Local ID: 6576ISBN: 91-85297-59-3 (print)OAI: oai:DiVA.org:liu-24463DiVA: diva2:244782
Public defence
2005-04-22, C3, Hus C, Campus Valla, Linköping, 10:15 (Swedish)
Opponent
Available from: 2009-10-07 Created: 2009-10-07 Last updated: 2012-11-30
List of papers
1. Modelling of means in conceptual design
Open this publication in new window or tab >>Modelling of means in conceptual design
2002 (English)In: Proceedings of the 7th International Design Conference. Vol. 1 / [ed] Marjanovic, D., Zagreb: Faculty of Mechanical Engineering and Naval Architecture , 2002, 579-584 p.Conference paper, Published paper (Refereed)
Abstract [en]

The systematic design approach proposes functional decomposition as a central element of conceptual design [Pahl; Beitz 1999]. This paper treats the objects used during conceptual design of such a systematic design process on the example of several student projects. It is commonly agreed upon that the choice of an adequate concept is crucial for the following embodiment and detail design phases, as a bad principle solution cannot be compensated even by a good detail design. Tools for concept generation are available, but often paper-based, e.g. design catalogues [Roth 2001], and not optimal regarding quick access and large amounts of information. "Building blocks" of principle solution elements with higher degree of aggregation suitable for search and reuse are desired, but require the prior knowledge of how objects of conceptual design, and specifically means, can be modelled.

Place, publisher, year, edition, pages
Zagreb: Faculty of Mechanical Engineering and Naval Architecture, 2002
Keyword
product modelling, conceptual design, design support
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-22613 (URN)1893 (Local ID)953-6313-46-4 (ISBN)1893 (Archive number)1893 (OAI)
Conference
International Design Conference - Design 2002, Dubrovnik, May 13-17, 2002
Available from: 2009-10-07 Created: 2009-10-07 Last updated: 2013-11-13
2. Search methods for principle solution elements in conceptual design
Open this publication in new window or tab >>Search methods for principle solution elements in conceptual design
2002 (English)In: Proceedings of the 4th NordDesign Conference NordDesign 2002, Visions and Values in Engineering Design / [ed] Boelskifte, P; Sigurjónsson, J. B., Trondheim: NTNU , 2002, 343-351 p.Conference paper, Published paper (Refereed)
Abstract [en]

Search for principle solution elements is a crucial step in conceptual design. In order to support this search and facilitate reuse of existing knowledge, search methods are analysed regarding their applicability for engineering design. A combination of search methods working on higher semantic level is proposed for further verification in a prototype for computer support.

Place, publisher, year, edition, pages
Trondheim: NTNU, 2002
Keyword
conceptual design, design support, solution search, partial model
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-22614 (URN)1894 (Local ID)82-91917-13-2 (ISBN)1894 (Archive number)1894 (OAI)
Conference
4th NordDesign Conference NordDesign 2002, Visions and Values in Engineering Design, August 14-16, Trondheim, Norway
Available from: 2009-10-07 Created: 2009-10-07 Last updated: 2013-11-13
3. A conceptual design support system using principle solution elements
Open this publication in new window or tab >>A conceptual design support system using principle solution elements
2003 (English)In: 14th International Conference on Engineering Design: Research for Practice - Innovative Products, Processes and Organisations / [ed] Folkeson, A; Gralén, K; Norell, M; Sellgren, U, Glasgow: The Design Society , 2003, 295-296 p.Conference paper, Published paper (Refereed)
Abstract [en]

The parametric modelling paradigm has become important in shape design and simulation. A prerequisite for product development with an integrated digital model is the availability of parametric models even for early design stages. This paper presents a parametric information model for conceptual design, consisting of requirements, hierarchical functions, function structure, principle solution elements and concepts, and a computer tool prototype based on the model.

Place, publisher, year, edition, pages
Glasgow: The Design Society, 2003
Keyword
concept generation, early phases of design, constraint-based design, functional modelling
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-22611 (URN)1891 (Local ID)1-904670-00-8 (ISBN)1891 (Archive number)1891 (OAI)
Conference
International Conference on engineering desing, ICED 03, Stockholm, August, 19-21, 2003
Available from: 2009-10-07 Created: 2009-10-07 Last updated: 2013-11-13
4. Supporting concept synthesis by use of genetic algorithms
Open this publication in new window or tab >>Supporting concept synthesis by use of genetic algorithms
2004 (English)In: Tools and Methods of Competitive Engineering, Proceedings Fifth International Symposium on Tools and Methods of Competitive Engineering / [ed] Horvath, I; Xirouchakis, P, Rotterdam: Milpress , 2004, 255-266 p.Conference paper, Published paper (Other academic)
Abstract [en]

Evolutionary algorithms are common in parameter optimisation of a given solution. Conceptual design, however, initially involves finding a principle solution, and a bad principle choice can hardly be compensated by even the best detail design and parameter optimisation. This article therefore describes an approach to apply agenetic algorithm for concept synthesis by modelling principle choices as weil as their parameter values and treating both asoptimisation variables. The results are three alternative genome representations (of which a tree genome finally was chosen), algorithms for crossover and mutation operating on the tree genome and an evaluation strategy including weighted sum assessment over multiple criteria (conjunctive selection) as weil as meclhanisms that favour (disjunctive selection) or penalise (disjunctive elimination) concepts performing well or bad in one criterion respectively. The first task was to develop the method, which is also the focus of this article. Testing it in case studies in order to assess the effectiveness and practical applicability remains as a subsequent task. It can though be concluded that the presented approach fulfils its purpose, as it is capable of modelling the choice of the right principle solution during conceptual design.

Place, publisher, year, edition, pages
Rotterdam: Milpress, 2004
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-21078 (URN)90-5966-018-8 (ISBN)
Conference
Fifth International Symposium on Tools and Methods of Competitive Engineering, Lausanne, Switzerland, April 13 - 17, 2004
Available from: 2009-09-28 Created: 2009-09-28 Last updated: 2012-11-30Bibliographically approved
5. Integrated modelling of concept synthesis and early calculations using exchangeable principle solution elements
Open this publication in new window or tab >>Integrated modelling of concept synthesis and early calculations using exchangeable principle solution elements
2004 (English)In: Proceedings of the 8th International Design Conference. Vol. 2, Zagreb: Faculty of Mechanical Engineering and Naval Architecture , 2004, 959-964 p.Conference paper, Published paper (Refereed)
Abstract [en]

No abstract available.

Place, publisher, year, edition, pages
Zagreb: Faculty of Mechanical Engineering and Naval Architecture, 2004
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-24090 (URN)3656 (Local ID)953-6313-59-6 (ISBN)3656 (Archive number)3656 (OAI)
Conference
International Design Conference - Design 2004, Dubrovnik, May 18-20, 2004
Available from: 2009-10-07 Created: 2009-10-07 Last updated: 2012-11-30
6. Extended support of conceptual design using operating states and dimensioning cases
Open this publication in new window or tab >>Extended support of conceptual design using operating states and dimensioning cases
2004 (English)In: Proceedings of NordDesign 2004 conference / [ed] Lehtonen, T; Pulkkinen, A; Riitahuhta, A, Tempere, Finland: Tempere University of Technology Product Development Laboratory , 2004, 21-30 p.Conference paper, Published paper (Refereed)
Abstract [en]

This article focuses on conceptual design. In this phase, systematic design provides models for function analysis and concept synthesis. Little support exists though for early consideration of different operating states and dimensioning cases while concepts arc developed. This is important in order to comprehend the relation between product requirements and design characteristics in different or changing environments or use cases. This article suggests modelling each operating state and each dimensioning case using a dedicated object and describing conceptual design using a constraint network in order to explicitly capture the inter-element relations. The purpose is to facilitate early quantitative reasoning (e.g. to check if a requirement is fulfilled in a specific dimensioning case with specific chosen means and values), to simplify the change of views (e.g. analysing another operating state) and to flexibly support change operations on the designed product (e.g. changing a solution principle or a value choice in a concept).

Place, publisher, year, edition, pages
Tempere, Finland: Tempere University of Technology Product Development Laboratory, 2004
Keyword
Conceptual design, design support, design concept. operating states, dimensioning
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-24083 (URN)3647 (Local ID)952-15-1227-X (ISBN)3647 (Archive number)3647 (OAI)
Conference
NordDesign 2004 - Product Design in Changing Environment, Tempere, Finland, 18-20 August, 2004
Available from: 2009-10-07 Created: 2009-10-07 Last updated: 2012-11-30
7. Function- and constraint-based conceptual design support using easily exchangeable, reusable principle solution elements
Open this publication in new window or tab >>Function- and constraint-based conceptual design support using easily exchangeable, reusable principle solution elements
2005 (English)In: Artificial intelligence for engineering design, analysis and manufacturing, ISSN 0890-0604, E-ISSN 1469-1760, Vol. 19, no 3, 201-219 p.Article in journal (Refereed) Published
Abstract [en]

Conceptual design produces a number of functions the designed product is to fulfill, several solution principles (means) for each function, and multiple overall principle solutions (concepts). Besides concept synthesis, it is important to determine the (few) early solution properties that are of interest at the concept stage. Further activities are assessing the consequences of the chosen means and their instantiation, the effects of changes, and how decisions affect other elements. Using a quantitative functional representation can facilitate these tasks, but a balance is needed between product-dependent tools predicting many detailed properties, and product-independent, generally applicable tools with limited prediction capabilities. A balance between a closed, general set of predefined building blocks and extensibility by modeling application-specific, individual elements is also necessary. In this paper, a generally applicable conceptual design model is presented, which has been established by theoretical reasoning applied to a number of products. These products were the subjects of previous company-ordered student projects. The resulting information model spans continuously from requirements to concepts and permits modeling desired functionality (functions), achieved functionality (means and their value choices), and explicit constraints (internal and external relations between parameters of requirements, functions and means). To indicate the suitability in principle, the model has been implemented in an interactive, incremental prototype for computer support that permits modeling, storage, and reuse in a database. It can be concluded that the model permits explicit modeling of complex relations, automatic change propagation, and handling of many concept alternatives. Integrated, bidirectional, and continuous connections from requirements to concepts facilitate conceptual design, reuse, documentation of the results, and allow changes to be made and their effects assessed easily. Incremental constraint networks are approved, for example, in configuration design or geometry modelers, and the significance of this article is to enable their use also for quantitative analysis of incomplete, evolving concepts in original design tasks allowing different principle solutions, and for various products of mechanical design.

Keyword
Concept Synthesis; Constraint Networks; Functional Modelling; Systematic Design.
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-29472 (URN)10.1017/S0890060405050146 (DOI)14821 (Local ID)14821 (Archive number)14821 (OAI)
Available from: 2009-10-09 Created: 2009-10-09 Last updated: 2017-12-13

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Output format
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