基于ANSYS软件的二维地铁轮轨滑移摩擦热分析

根据地铁轮轨的真实尺寸外形,利用有限元软件ANSYS建立滑移过程中轮轨摩擦生热的二维弹性接触模型。该模型选取轮轨单元为热结构耦合单元,利用瞬态热分析求解器对摩擦热进行计算。该模型考虑轮轨间的热传导率和表面换热系数,通过仿真分析摩擦生热的基本现象,以及不同的速度、滑移率和摩擦系数对轮轨表面温度的影响,得出以下结论:轮轨温度和等效应力主要表现在轮轨表面,且受限于轮轨深度,随着深度的增加,温度和等效应力逐渐减小;但随着速度、滑移率和摩擦系数的增加,轮轨表面的温度均增加。

Thermal analysis of two-dimensional wheel-rail sliding friction based on ANSYS software

Based on the real dimension and profile of metro wheel/rail,the two-dimensional elastic contact model of wheel/rail friction thermal generation in the sliding process is established by using the fi nite element software ANSYS.In this model,the wheel rail element is selected as the thermal structure coupling element,and the transient thermal analysis solver is used to calculate the friction thermal.The model has taken the heat conductivity and surface heat transfer coefficient between wheel and rail into consideration,and this paper analyzes the basic phenomenon of friction thermal generation and the infl uence of different speed,slip ratio and friction coefficient on the surface temperature of wheel and rail by simulation.The conclusions is that the temperature and equivalent stress of wheel and rail are mainly on the surface of wheel and rail,and are limited by the depth of wheel and rail,and with the increase of depth,the temperature and equivalent stress increase gradually decrease.However,with the increase of speed,slip ratio and friction coefficient,the temperature of wheel rail surface increases as well.