基于相对灵敏度分析的客车车架轻量化

以某客车车架为研究对象，进行模态分析并与试验模态比较，验证了有限元模型的准确性；进行刚度分析，验证了该车架弯曲刚度和扭转刚度符合设计要求。在此基础上，考虑车架结构件板厚对其低阶模态参数及质量的影响，对主要部件的板厚进行频率灵敏度和质量灵敏度分析。引入相对灵敏度，提取相对灵敏度较大的部件以板厚为设计变量进行优化分析。优化结果表明：车架固有频率降低，同时车架的质量也减少，达到了轻量化的目的。

Bus frame lightweight based on relative sensitivity analysis

Take some bus frame as research object,make modal analysis and experimental modal comparasion, verify the accuracy of finite element model,make stiffness analysis,verify the frame bend stiffness and tortional stiffness confirm with design requirement.Consider the thickness of body frame structure plate which be effect for its low modal parameter and quality,make analysis of frequency sensitivity and quality sensitivity for the plate thickness of main components.Introduce relative sensitivity,take a relatively larger sensitivity components in thickness as the design variables for optimization analysis.The optimization consequence shows：frame inherent frequency reduces,meanwhile the quality of frame also reduces,reach the purpose of lightweight.