Exploration in the preliminary mechanical design of trade-offs between automotive architectural constraints and aggregate noise performances

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Exploration in the preliminary mechanical design of trade-offs between automotive architectural constraints and aggregate noise performances

Hamdi, Abdelbasset / Yannou, Bernard / Landel, Eric

This paper deals with the preliminary design of large complex mechanical products. It gives a new way to lead tradeoffs between architectural constraints and mechanical performances. While topology optimization and structural optimization have been widely developed in the last two decades, they are still not adapted to take into account the problem of volume allocation in the preliminary design of large and complex mechanical systems as automotive vehicles and aircrafts. New approximate criteria to assess the compliance of architectural constraints and important mechanical performances like contributions to noise are proposed. These criteria are assembled within a sole performance metamodel that embeds most of decision issues usually discussed in the preliminary design stage and which allows to encompass the strict traditional volume allocation process. Through the use of Pareto techniques, we show that it is convenient and relevant to explore the design space by allowing great variation of the design morphology. The trade-offs are made possible since the stage of volume allocation and automotive architects can be helped by tools for leading quantitative negotiations in preliminary design.