Research on Metro Vehicle Wheel Wear and Reprofiling Strategy

Abstract

Objective Wheel wear directly affects the vibration environment of metro vehicles. Severe abnormal wear can lead to structural fatigue exceeding the limit, reducing the safety of train operation. Therefore, it is necessary to study the wear and reprofiling strategy of metro vehicle wheels to improve the maintenance level. Method Taking a certain type of metro vehicle in China as the research object, the wear law of metro vehicle wheels is analyzed. Based on the wear model of metro vehicle wheels and the prediction of wheel remaining service life, the variation characteristics of wheel key parameters in different operating stages are analyzed. Based on the comprehensive results of simulation models and field-measured data, an optimization plan for the operation and maintenance strategy is proposed. Result & Conclusion The results indicate that in the early stage of operation, the proportion of wheel loss from reprofiling is relatively high, and with the improvement of wheel-rail matching, wheel-rail wear replaces reprofiling loss as the main wear mode. Properly reducing the wheel-rail friction coefficient and the operating speed is beneficial for reducing the wheel-rail wear power. The use of small-scale reprofiling methods and flexible feed amount effectively reduces wheel radial wear and prolongs their service life. The research results can provide corresponding measures for reducing wheel-rail wear on metro lines and optimizing wheel reprofiling technology.

Keywords

• metro
• wheel wear
• reprofiling strategy
• wear rate
• service life