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THE AUTOSIM PROJECT 4.5.7 Design-to-Cost Functional Requirement and Cost Trade-off studies using Parameterized Vehicle Concepts in the Early Design Phase. Affordability is one of the key issues for design engineers and manufacturers of new car body models. Sometimes vehicle development projects have failed to enter the production phase because cost was not factored in during the early development phase and it was realized later that the vehicle program could not meet the projected financial targets. Likewise, many vehicle projects that went into production with severe cost and manufacturing constraints failed in the marketplace because of limited improvement in vehicle functionality or performance. Either case is due primarily to the lack of understanding of the cost and performance relationship and engineering alternatives during the vehicle development cycle (Ref. [18], [19]). To stay competitive, it is becoming vital to include cost engineering at every stage of a new program to ensure success in achieving performance targets while managing cost. Cost engineering has been applied in recent years starting in the aerospace and defence industries and researched continuously by academia. Several enabling technologies have been developed over the years such that it is now possible to bring cost engineering into the modern simulationbased development process for vehicle body structure in the early concept stage. These include: 1) Reasonably accurate performance models based on finite element techniques 2) Capable cost estimating tools, with commercial or in-house developed tools. 3) Parametric concept development systems that allow for fast changes of concept geometry and the associated computational models. 4) A process integration and computational framework that can flexibly integrate simulation models and cost models into a simulationbased design iteration loop to study cost-performance trade-off. Fig.4.5.7.1 shows a schematic workflow of such a system that can be applied to automotive body design. Changing the architecture features will trigger changes in cost estimates of materials and manufacturing. SIXTH FRAMEWORK PROGRAMME PRIORITY [6.2] [SUSTAINABLE SURFACE TRANSPORT] 012497 AUTOSIM 57 |
CURRENT & FUTURE TECHNOLOGIES IN AUTOMOTIVE ENGINEERING SIMULATION Design to Cost Per for ma nce Cost Constraint Cost Fig.4.5.7.1: Schematic workflow of Design-to-Cost applied in automotive car body design (Courtesy of SFE GmbH and Engineous Inc.) Within the environment of a competence center ASCS (Automotive Simulation Center Stuttgart) which was founded earlier this year in 2008 in the Federal State of Baden – Wüttemberg (Germany), Porsche (Ref. [21]) intends to investigate the Multi Disciplinary Optimisation (MDO) of vehicle structures with regard to functional requirements as well as to cost considerations (Fig. 4.5.7.1, Fig. 4,5,7,2). Fig. 4.5.7.2: MDO including cost as an additional design parameter (Courtesy of Prof. Erich Schelkle (Porsche AG), Ref. [21]) 58 | SIXTH FRAMEWORK PROGRAMME PRIORITY [6.2] [SUSTAINABLE SURFACE TRANSPORT] 012497 AUTOSIM
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Current & Future Technologies in Au
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The Consortium Steering Committee w
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4.5 How To Move On ................
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CURRENT & FUTURE TECHNOLOGIES IN AU
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CURRENT & FUTURE TECHNOLOGIES IN AU
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