市域动车组车体模态性能提升研究

Research on improvement of modal performance for urban EMU car body

针对市域动车组车体模态频率低的问题,文章进行了理论分析和仿真优化,提出三种车体模态性能提升策略。第一,基于灵敏度分析,以型材板厚参数为变量,优化车体一阶垂弯频率。第二,改变车体结构参数,研究车门宽度尺寸对车体模态频率的影响。第三,改进车下大质量设备与车体连接方式,提升车体一阶垂弯频率。仿真与试验结果表明,优化后的整备车体一阶垂弯频率大于10 Hz,满足设计要求。

Aiming at the problem of low modal frequency of urban EMU car body,this paper carries out theoretical analysis and simulation optimization,and puts forward three strategies to improve the modal performance of car body.Firstly,based on the sensitivity analysis,the first-order vertical bending frequency of the car body is optimized by taking the thickness parameters of profile plate as variables.Secondly,the influence of door width on the modal frequency of car body is studied by changing the structural parameters of car body.Thirdly,improve the connection mode between the large-mass equipment under the vehicle and the car body,and increase the first-order vertical bending frequency of the car body.The simulation and test results show that the first-order vertical bending frequency of the optimized car body is greater than 10 Hz,which meets the design requirements.