基于应变模态的车轴动应力仿真计算

摘要

Based on the strain modal analysis results of EMU's motor-car axle and trail-car axle, and combined with actual line test data, simulation and calculation of dynamic stress to EMU's axles was done with modal superposition method. Stress-time history of the corresponding point on motor-car axle and trail-car axle was obtained, and comparison with the line test data was also performed. The results show that: stress-time history of the measured points got by simulation and calculation was in good agreement with the test results. Therefore, the feasibility of calculating dynamic stress with strain modal and test data was verified, and it is doable to make further research on the fatigue strength analysis.%基于动车组的动车车轴和拖车车轴的应变模态分析结果,结合线路实测数据,运用模态叠加法对动车组车轴进行了动应力的仿真计算,得出了两种车轴上相应测点的应力时间历程,并与线路测试数据进行了比较.结果表明:经过仿真计算得到的测点应力时间历程与实测结果比较吻合,从而验证了将应变模态与测试数据结合计算动应力的可行性,可以进一步开展疲劳强度分析.