高速动车组轴箱轴承疲劳可靠性分析

Fatigue Reliability Analysis for Axle Box Bearing of High Speed EMU

为提高高速动车组轴箱轴承的设计水平,确保轴箱轴承的安全可靠运行,运用有限元理论和疲劳分析理论对轴箱轴承进行疲劳可靠性分析。考虑轴箱轴承载荷、密度、泊松比和弹性模量等设计参数的不确定性,通过APDL语言建立高速动车组轴箱轴承的参数化模型,利用ANSYS非线性有限元分析方法对轴箱轴承进行静强度分析。应用ANSYS的概率设计模块,根据疲劳失效准则建立轴箱轴承疲劳可靠性分析的极限状态方程,采用Monte-Carlo拉丁超立方抽样方法对轴箱轴承进行疲劳可靠性分析,得到轴箱轴承的疲劳可靠度、最大接触应力的概率分布特征及载荷、密度、泊松比和弹性模量等设计参数对应力分布的灵敏度。研究结果表明,轴箱轴承的疲劳寿命达到了设计要求,同时灵敏度分析结果对轴箱轴承设计有一定的指导作用。

In order to improve the design level of high speed EMU axle box bearing and ensure the safe and relia- ble operation of axle box bearing, finite element methods and fatigue analysis theory were applied to fatigue reliability analysis of axle box bearing. Considering the uncertainty of the load, density, poisson＇s ratio and elastic modulus of the axle box bearing, a parametric model of axle box bearing was built with APDL language. The static strength analy- sis was carried out with nonlinear finite element analysis method of ANSYS. Based on the fatigue failure criterion, the limit state equation for the fatigue reliability analysis of the axle box bearing was established by using the probabilistie design module of ANSYS. The Monte-Carlo Latin hypercube sampling method was used for analyzing the fatigue reli- ability of axle box bearing. Finally, the fatigue reliability of axle box bearing, probability distribution of maximum contact stress and sensitivity of stress distribution of the load, density, poisson＇s ratio and elastic modulus were ob- tained. The results show that the fatigue life of the axle box bearing reaches the design requirement, and the results of sensitivity analysis have a guiding significance for design of the axle box bearing.