动刚度分析在车身NVH性能方面的研究与应用  

Research and Application of Dynamic Stiffness Analysis on NVH Performance of Vehicle Body

作　　者：王宇[1] 潘鹏[1] 辛丕海 

机构地区：[1]合肥工业大学机械与汽车工程学院,安徽省合肥市230009

出　　处：《农业装备与车辆工程》2016年第4期34-38,共5页Agricultural Equipment & Vehicle Engineering

摘　　要：介绍了动刚度的基本概念和相关理论,并对原点动刚度的理论公式进行了推导。建立白车身有限元模型,通过对车身关键接附点频率响应分析,得出原点加速度导纳频率响应曲线。通过动刚度试验对CAE仿真进行验证。对动刚度仿真结果进行分析,判断出动刚度不足的频率范围,通过灵敏度分析找出对相关频率动刚度不足影响较大的车身板件。然后采用尺寸优化提高关键点的动刚度,从而改善车身NVH性能。The basic concepts and related theories of dynamic stiffness are introduced,and the theoretical formula of the dynamic stiffness of the origin is derived. The finite element model of BIW is established. By frequency response analysis of key connecting points of the body,the origin acceleration admittance frequency response curve is drawn. CAE simulation is verified by dynamic stiffness experiment. The dynamic stiffness simulation results are analyzed to determine the frequency range where dynamic stiffness is not high enough. By sensitivity analysis,the body panels that have big impact on dynamic stiffness of relevant frequency are found out. Then,the dynamic stiffness of key points is improved by size optimization,and the NVH performance of the body is improved.

关 键 词：动刚度 加速度响应 频率响应分析 灵敏度 声压响应 

分 类 号：U463.82[机械工程—车辆工程]