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Topology optimization of frame structures: a vehicle body application
Volvo Car Corporation, Göteborg, Sweden.
(English)Manuscript (preprint) (Other academic)
Abstract [en]

An application of frame topology optimization on a vehicle body structure is presented. A traditional way of describing the elements of a vehicle body structure is by beams and joints. Based on this, the models used in this study are frame structures with flexible joints. The problem considered is to find that stiffest frame design which fulfills a weight requirement. To support for a topological change of joints, each joint is modelled as a set of subelements. A set of design variables are applied to each beam and joint subelement. Two kinds of design variables are used. One of these variables is an area-type design variable used for controlling the global element size and supporting a topology change. The other variables are length ratio variables controlling thecross-section of bemas and internal stiffness properties of joints. The vehicle body application presented in this paper shows the usefulness of topology optimization in the early design phase.

National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:liu:diva-87820OAI: oai:DiVA.org:liu-87820DiVA: diva2:600134
Available from: 2013-01-23 Created: 2013-01-23 Last updated: 2013-01-23
In thesis
1. Topology optimization of vehicle body structures: method, theory and applications
Open this publication in new window or tab >>Topology optimization of vehicle body structures: method, theory and applications
2004 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This dissertation is concerned with topology optimization of vehicle body structures.

The first part of this thesis gives a summary of the research project. A design process for complex mechanical structures is presented. This design process includes an optimization step where simplified models are optimized. These simplified models are frame structures consisting of beams and joints. Joints are modelled as a collection of sub-elements to support for a topological change during optimization. Parameterization of beams and joint is also presented and design variables are introduced.

An application of this frame topology optimization method, concerning a vehicle body structure, is presented.

Two extensions to the theory are also presented. First, the possibility to penalize joints to support for easily realizable results is presented. This is followed by a two-material interpolation that introduces the possibility of using a mixed material structure.

This introductory part is followed by five appended papers produced within the framework of this research.

Abstract [sv]

Denna doktorsavhandling behandlar topologioptimering av fordonskarosser.

Första delen i avhandlingen ger en summering av forskningsprojektet. En produktutvecklingsprocess för komplexa mekaniska system presenteras. Denna process innefattar ett optimeringssteg där förenklade modeller optimeras. Dessa förenklade modeller är modellerade som ramstrukturer baserade på balkar och knutar. Knutarna är modellerade m.h.a. en uppsättning delelement för att möjliggöra en topologisk ändring under optimimeringsprocessen. Även balkars och knutars parameterisering och designvariabler beskrivs i den inledande delen. En tillämpning av topologioptimering får ramar presenteras på en fordonskarossmodell. Två utvecklingar av teorin gås också igenom. Först beskrivs möjligheten att tillämpa knutstraff vilket möjliggör skapandet av mer realiserbara modeller. Detta efterföljs av en tvåmaterialinterpolering vilken introducerar möjligheten att generera strukturer med optimalt materialval. Slutligen identifieras framtida forskning inom området.

Den inledande delen följs sedan av fem artiklar vilka har genererats under projektets gång.

Place, publisher, year, edition, pages
Linköping: Linköpings universitet, 2004. 43 p.
Series
Linköping Studies in Science and Technology. Dissertations, ISSN 0345-7524 ; 885
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-22915 (URN)2270 (Local ID)91-7373-979-0 (ISBN)2270 (Archive number)2270 (OAI)
Public defence
2004-09-09, Sal C3, Hus C, Linköping Universitet, Linköping, 10:15 (Swedish)
Opponent
Available from: 2009-10-07 Created: 2009-10-07 Last updated: 2013-01-23

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Fredricson, Harald

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