Research On Structure Lightweight Of Car-door Base On Multidisciplinary Design Optimization

Automotive lightweighting can not only reduce the materials required for theautomobile manufacturing, but also it can improve the power performance and fueleconomy of vehicles and so on. Automotive lightweighting has been became the target ofengineers and manufacturers. Body design needs to consider multiple disciplines such asstiffness, strength and safety. Multidisciplinary design optimization by making full use ofsynergies generated by the interactions between the various disciplines can get theoverall optimal result in the system and shorten the design cycle by realization ofconcurrent design.This paper mainly study from the following aspects:(1)Finite element model of the car door was built and the stiffness, strength anddynamic characteristics, safety performance indicators was got by computer simulation.(2) Multidisciplinary design optimization system decomposition was implementedto the car door and multidisciplinary design optimization model of the car door wasestablished.(3) Sensitivity analysis of design variables was implemented, to eliminate the designvariables of small influence on the structure in order to reduce the consumption ofcomputing resources.(4) The response surface was built and the global optimal result was got by themultidisciplinary design optimization with genetic algorithm base on the responsesurface.Research shows that multidisciplinary design optimization can make full use ofsynergies between disciplines, to obtain the global optimal solution of the system andshorten the design cycle. The weight of the door reduces by15%after multidisciplinarydesign optimization to achieve the purpose of lightweight and the performance indicatorsmeet the design requirements.