基于模态优化的动车组蓄电池箱结构可靠性分析

The structural reliability analysis of battery box of EMU based on modal optimization

为了改善动车组蓄电池箱的结构性能,将模态优化与可靠性理论相结合进行动车组蓄电池箱结构可靠性分析。首先建立动车组蓄电池箱的有限元仿真模型,利用ANSYS软件对蓄电池箱进行模态分析。然后根据模态分析结果,对蓄电池箱一阶频率进行板件厚度的灵敏度分析,选取6个板件的厚度作为设计变量,利用响应面模型对蓄电池箱进行一阶模态优化。最后根据优化结果,以蓄电池箱一阶频率小于车体自振频率为可靠性评定指标,使用蒙特卡罗法对优化后的蓄电池箱进行结构可靠性分析。结果表明,优化后蓄电池箱一阶频率减小,不与车体发生共振的概率为98.64%。

Aiming at the structural performance of the battery box of EMU,it combines the modal optimization with the reliability theory to analyze the structural reliability of the battery box of EMU.It builds the simulation model of the battery box of EMU,obtains the modal analysis of the battery box in ANSYS,analyzes the sensitivity of the first order frequency of the battery box on sheet thickness.Taking the thickness of six sheet as the design variable,it realizes the first order modal optimization of the battery box.Based on the optimization results,it applied Monte Carlo method to proposes the structural reliability of the battery box in view of the reliability evaluation criterion that the first order frequency of the battery box is less than the natural frequency of the car body.The results show that the first order frequency of the battery box is reduced,and the probability of not resonance with the car body is 98.64%.