Analysis on the Formation Mechanism of the Double Contact Bands on the Wheel Tread of Metro Vehicle

doi:10.3901/JME.2021.18.240

Abstract

Abstract: The contact band is a direct reflection of the wheel-rail contact relationship, which displays the trajectory of contact points between wheel and rail and also affects the dynamic performance of the vehicle. Through a wheel profile measurement of a linear motor metro line in China, two distinct contact bands on the wheel are observed, which are located on both sides of the nominal rolling circle of wheels. Based on the electro-mechanical coupling dynamic model of linear motor metro vehicle and Archard wear model, the formation mechanism of double contact bands is analyzed by using the experimental data measured in the field test. The analysis shows that the different contact areas on the left and right wheel tread when the vehicle passing through tight curves, as well as the double contact patches due to the inappropriate wheel/rail profile compatibility on the tangent track are the primary cause of the double contact bands on the wheel tread. Wheel re-profiling alone cannot eliminate the problem of double contact bands completely. Meanwhile, in the rail grinding, attention should also be paid to maintaining a reasonable rail profile to avoid the formation and development of the double contact bands of the wheels. Through the simulation of vehicle running on small radius curves and track with the measured rail profile, the calculated peak position of wheel tread wear is consistent with the measured double contact bands position.

Key words: double contact bands, linear motor metro, wheel wear, numerical simulation

CLC Number:

U211

XU Shijie, GUAN Qinghua, ZHANG Xiongfei, ZHAO Changyu, WEN Zefeng, LU Wenjiao. Analysis on the Formation Mechanism of the Double Contact Bands on the Wheel Tread of Metro Vehicle[J]. Journal of Mechanical Engineering, 2021, 57(18): 240-251.

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