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Managing Product and Process Knowledge in CAD-Systems
Jönköping University, School of Engineering, JTH. Research area Computer Supported Engineering Design. Jönköping University, School of Engineering, JTH, Mechanical Engineering.
2009 (English)In: NordPLM'09: Proceedings of the 2nd Nordic Conference on Product Lifecycle Management / [ed] Johan Malmqvist and Göran Gustafsson, Göteborg: Chalmers University of Technology , 2009, p. 51-61Conference paper, Published paper (Refereed)
Abstract [en]

In order to codify, manage, and reuse the knowledge gained from pursing product development projects, CAD-programs have started to provide functionality for supporting this activity. Since the primary purpose of the CAD program is to interactively define geometry, the functionality has been integrated primarily to be used on the parameters of the CAD-model of the design instance. This paper explores how the functionality can be used in a broader scope, managing and automatically reusing knowledge for all designs intended for a certain production process. This is facilitated by automatically converting an arbitrary CAD-model of a design to a format that is accessible for knowledge handling and reuse functionality in the CAD-system. A conversion algorithm for the processes die-casting and powder metallurgy pressing sintering is presented, as well as showing how the knowledge can be represented in the CAD-system. This will allow engineers to actively participate in the knowledge build-up and insure that the general knowledge can be handled in the companies’ IT-infrastructure.

Place, publisher, year, edition, pages
Göteborg: Chalmers University of Technology , 2009. p. 51-61
Keyword [en]
Production process, Knowledge-based engineering, CAD, Application programming, Knowledge management
Identifiers
URN: urn:nbn:se:hj:diva-10698ISBN: 978-91-975079-7-4 (print)OAI: oai:DiVA.org:hj-10698DiVA, id: diva2:273405
Available from: 2009-10-21 Created: 2009-10-21 Last updated: 2010-04-12Bibliographically approved
In thesis
1. CAD-Model Parsing for Automated Design and Design Evaluation
Open this publication in new window or tab >>CAD-Model Parsing for Automated Design and Design Evaluation
2008 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Product development has both innovative and analytic sides. Starting from the requirements, a design suggestion is generated. In order to assess how well the envisioned design fulfils the requirements, it is sometimes necessary to build a computer model of it for the analysis. The overall motivation of the work presented is to reduce the time spent on creating the model by reusing knowledge gained from developing similar products by suggesting, building and evaluating IT-systems. To verify the systems real design examples, obtained from companies that have participated in the research projects have been used.

The work is based on two major application examples. The first, involving the automated geometrical idealisation of die-cast parts (Paper I-III), and the second involving manufacturability of powder metallurgy pressed and sintered parts (Paper IV-VI). The work starts from the point in the product development process where it exists a design suggestion represented as an arbitrary format CAD-model. In the powder metallurgy case the object is to secure that the geometry is suitable for the production process. In the die-casting case the object is to automatically create an idealised version of the model for shell elements meshing. These two tasks have previously been treated as two separate cases, addressed by completely different software. This thesis suggests a common method for addressing the two cases. The method is based on converting the CAD-models, using the geometrical restrictions of the production processes, into a format with a specialised feature structure, parameterisation and construction history using a feature recognition approach. The features are then automatically reconstructed in a target CAD-system. The resulting, specialised CAD-model can be used for automated design and design evaluation purposes, demonstrated in the thesis. The models are therefore called DAR (Design Automation Ready)-models. The DAR-models are useful in that they separate the conversion from the subsequent treatment of the models providing modularisation, flexibility and user insight in the model structure. In that a construction history and parameterisation have be constructed in the target CAD-system, the advanced geometry manipulation and means for knowledge management often provided in modern CAD-systems can be accessed in a transparent and user manageable way. This extends the usefulness of the CAD-systems from involving only interactive work to managing all components sharing the same production process.

Place, publisher, year, edition, pages
Göteborg: Chalmers Reproservice, 2008. p. 162
Series
Doktorsavhandlingar vid Chalmers Tekniska Högskola, ISSN 0346-718X ; 2856
Keyword
Design automation, CAD, KBE, Feature based modelling, Feature recognition, Product development.
National Category
Production Engineering, Human Work Science and Ergonomics
Identifiers
urn:nbn:se:hj:diva-10700 (URN)978-91-7385-175-6 (ISBN)
Public defence
2008-12-11, E1405, Tekniska Högskolan i Jönköping, Gjuterigatan 6, 551 11 Jönköping, Jönköping, 10:00 (English)
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Supervisors
Note
Teknologie DoktorsexamenAvailable from: 2009-11-03 Created: 2009-10-21 Last updated: 2009-11-03Bibliographically approved

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Stolt, Roland

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