客车车身前围动刚度分析及优化

摘要

A FEA model of a domestic front-engine bus body was established based on MSC.PATRAN/NASTRAN,the direct frequency response method was applied and some response points of the front wall were picked up,the resonance location of fiont wall as well as the corresponding frequency band was found by analyzing it. Furthermore ,the section of front wall and some rods directly linked to it were chosen as the variables ,the amplitude of acceleration response was chosen as the state variables ,the frequency response was optimized. The results show that this method is effective in dynamic stiffness optimization on front wall of a bus body,and also provides a reference for dynamic stiffness optimization on the vehicle.%基于MSC.PATRAN/NAsTRAN软件建立某国产前置发动机客车车身的有限元分析模型,采用直接频率响应法,拾取前围相应点的加速度响应,通过分析得出前围共振的位置以及相应的频率段,进而以前围以及与前围直接相连的杆件的截面尺寸作为优化变量,以响应点加速度响应的幅值作为状态变量,进行频率响应优化.结果表明:该分析方法可有效进行客车车身前围动刚度优化,为实现整车动刚度的优化提供参考.