高速动车组车轮型面多目标优化镟修

Wheel Reprofiling of High-speed EMU Based on Multi-objective Optimization Strategy

提出一种新的高速动车组车轮型面优化镟修方法,以与车辆系统动力学中的临界速度、影响轮轨系统磨损接触疲劳的接触应力和车轮名义滚动圆直径大小相关的三个函数为目标函数,以车轮外形曲线控制点的纵坐标为设计变量,样条曲线控制点的纵坐标上下界作为曲线的附加条件,以车轮型面的轮缘高、轮缘厚、接触角参数及样条曲线的导数作为车轮外形的几何约束参数,建立了高速动车组车轮型面多目标优化镟修模型.优化结果表明:基于多目标优化镟修模型,可以使得磨耗后的车轮不必镟修到标准型面就可以达到接近于标准型面时的综合性能,并且减少了车轮外形的镟修量,延长了车轮的使用寿命.

A new approach was presented to optimize worn wheel reprofiling of the high-speed electric multiple unit （EMU）, and three functions were selected respectively, which were related to the critical velocity of vehicle system dynamics, the contact stress affecting the contact fatigue of wheel-rail wear and the diameter of the nominal rolling circle of a wheel, as the objective functions. The vertical coordinates of control points on the wheel profile curve served as the design variables and their upper and lower values as corresponding additional conditions. The height, thickness and contact angle of the wheel flange as well as the derivative of the wheel profile curve were empolyed as geometric constraint parameters. A model of multidisciplinary optimization was established for wheel reprofiling of high- speed EMU. Subsequently, a comparative study was made.Results show that based on the reprofiling model of multiobjective optimization, the comprehensive performance of a standard wheel profile can be closely obtained without reprofiling the worn wheel to the standard profile, and the amount of wheel reprofiling is reduced and the service life of wheelset is prolonged.