某轿车白车身结构灵敏度分析及优化设计

Structure Sensitivity Analysis and Optimized Design of a Certain White Bodywork

以某轿车白车身为研究对象,建立有限元模型,对车身进行动、静态灵敏度分析,以车身结构件的板厚为设计变量,进行车身固有频率、车身扭转和弯曲刚度,以及车身质量对板厚的灵敏度分析,找出对车身动、静态特性影响较大的部件,并根据部件的动、静态灵敏度对车身结构进行优化设计;计算车身质量对其固有频率、扭转和弯曲刚度的贡献率,据此确定最优方案.该方法能够为车身结构动态特性的改进、车身的轻量化和车身结构的优化设计提供重要依据.

Develops a finite element model to analyze the dynamic/static sensitivities of a certain white bodywork, i.e. , the sensitivities of its natural frequency, torsional stiffness and flexural rigidity and mass to the thickness of sheet to make the bodywork, thus finding out the main parts affecting greatly the dynamic and static characteristics of bodywork to optimize its structural design. According to the sizes of contribution the body mass will make to the natural frequency and torsional stiffness and flexural rigidity, an optimal conceptual design is given. This method provides an important reference for improving the dynamic performance of bodywork, lightening its weight and optimizing its design.