高速动车组设备舱支架结构抗疲劳性能研究

应用有限元分析软件ANSYS对两种设备舱支架结构进行静力仿真分析,获得了不同气动载荷工况下的支架结构应力响应情况,仿真结果表明：裙板气动载荷对支架结构的应力影响大于底板气动载荷;方案二支架结构改进处焊缝的应力情况得到明显改善.在时速330 km/h的情况下,测试了两种支架结构焊缝关键部位的动应力.采用雨流计数法编制了各测点的八级应力谱,并采用Goodman公式进行了对称化修正.结合材料的S-N曲线和Miner线性疲劳累计损伤理论计算了各测点的等效应力幅.对比计算结果表明,方案二支架结构的抗疲劳性能优于方案一.

Research on Anti-Fatigue Performance of Equipment Cabin Bracket of Electric Multiple Units

Static simulation of two kinds of equipment cabin brackets are analyzed by finite element analysis software ANSYS,and stress responses of the brackets under different Aerodynamic loads are obtained.The simulation results show that the stress responses of the brackets from apron aerodynamic load are bigger than those from backplane aerodynamic load,and the stress state at the weld seam of the modified structure of the second kind of bracket is significantly improved.At the speed of 330 km/h,the dynamic stresses at key points of weld seams of the two kinds of brackets are measured.Eight level stress spectrums of the key-points are programmed by rain-flow counting method.The stress spectrums are symmetrically modified by Goodman equation.Based on the material S-N curve and Miner linear cumulative damage law,the equivalent stress amplitudes of the measuring points are calculated.The comparison results show that anti-fatigue performance of the second kind of bracket is superior to that of the first one.