基于多工况的车门结构多目标优化设计方法研究

车门结构的单一工况优化设计常难以满足车门设计要求。本文基于车门垂直刚度和一阶模态两工况,提出一种车门结构多工况多目标优化设计方法。以车门垂直刚度、一阶频率和车门质量为优化目标,通过均匀拉丁方试验设计和响应面方法得出车门垂直刚度和一阶频率的近似数学模型,并在此基础构建车门结构多目标优化模型。最后采用多目标遗传算法对其进行求解,最终优化结果在车门质量减少的情况下,垂直刚度和一阶频率均达到设计要求,达到预期优化效果。

Research on Multi-working-conditions and Multi-objective Optimization for Vehicle Door Structure

The single-working-condition optimization is difficult to meet the structure design requirements of the vehicle door.A multi-working-conditions optimization method is introduced,and vertical stiffness and first-order mode are discussed as two working conditions in this thesis.The approximate mathematical models of vertical stiffness and first-order mode are both obtained by uniform Latin square design and RSM.Besides,the model of vehicle door weight is added in these two working condition.Then,these three mathematic models are solved with the multi-objective genetic algorithm.According to the optimization result,the vertical stiffness and first-order mode are satisfied while vehicle door weight is also reduced.