基于频率响应特性的动车组制动夹钳结构失效模式分析

FMEA of brake caliper structure for EMU based on frequency response characteristics

针对高速动车组制动夹钳单元的振动失效问题,借助稳态动力学仿真分析手段和正弦扫频试验,获取了制动夹钳结构关键位置的加速度频率响应曲线,识别了加速度响应峰值特征。通过与模态分析结果的频率匹配,得到了各阶峰值响应频率附近的结构振型和应力分布,并研究了制动夹钳在振动服役工况下可能出现的结构失效模式,为进一步的结构优化设计提供了依据。

Aiming at the failure of the brake caliper unit on high speed EMU due to vibration,the acceleration frequency response curves of brake caliper structure at key positions are obtained by means of simulation analysis of steady state kinetics and sine frequency scanning test,while the characteristics of acceleration response peak are identified.By matching the frequencies of mode analysis results,the vibration mode and stress distribution of the structures adjacent to peak response frequencies at every level are achieved,this paper also studies the possible structure failure mode of the brake caliper under operating vibration condition and could provide basis for further structural optimization.