Asymmetrical Wear of Metro Vehicle Wheels and Cause Analysis
The phenomenon of asymmetrical wear of wheel in subway trains has a serious impact on the safety and comfort of subway operations.In order to understand the characteristics and main causes of asymmetrical wheel wear of subway train,this paper presents a detailed analysis of the wear distribution on the wheels and rails of a domestic subway line through extensive field test data.The results show that wheel wear exists commonly in the subway trains,with significantly greater wear on the right wheel flange compared to the left wheel flange.The phenomenon of asymmetrical wear appears from 20,000 kilometers after wheel lathing and lasts until next wheel lathing.With the increase of the operating mileage,the phenomenon of asymmetrical wear becomes more and more serious.When the operating mileage after wheel lathing reaches 200,000 km,the wheel flange asymmetrical wear reaches 2.57 mm.The main causes for the occurrence of wheel flange asymmetrical wear include(1)the high number of curved sections,particularly those with sharp curves,in which the curve radius less than 400m accounts for 14.4%of the total mileage;(2)the uneven distribution of left and right curves,with the left curve nearly 2 times the length of the right curve;and(3)the long-term operation of the vehicles without changing directions.Finally,a wheel truing modification program has been proposed to reduce the asymmetrical wheel wear.The wear rate of the wheel lathing modification program is only 0.10 mm/10,000 km,which is 45%lower than that of the traditional wheel lathing program of 0.18 mm/10,000 km.
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