Comparison of Wheel-rail Contact Relationships on Wheel Treads of Different High-speed EMUs
In order to study the wheel-rail contact relationship of different high-speed EMUs in China,this paper investigates the wheel-rail matching characteristics of five wheel treads(LMA,LMB,LMC,LMD,LMB10)commonly used in China's high-speed EMUs and 60N rails of high-speed railroads.The geometrical relationship of wheel-rail contact is obtained based on the trace method,and the contact patch and the normal stress distribution within the contact patch of different wheel-rail matches are calculated by using the Semi-Hertz contact theory.The results of the study show that,from the contact geometry point of view,the equivalent conicity of LMA and LMC treads is small,the contact bandwidth on the tread and rail is small,and the contact points are concentrated;the contact bandwidth of LMB and LMD treads is larger,and the LMB10 tread is in the center,but the equivalent conicity of LMB tread is the largest.From the contact mechanics point of view,the contact patch shape of the LMA tread is closest to an ellipse,and the change of contact patch area and stress maximum under different transverse displacements is the smoothest;the LMC tread has a complex contact patch shape in the region near the rim,and the overall stress level is larger;the LMD tread has the largest change in the contact spot position but the the smallest contact stress at small traverse ranges;and the contact spot characteristics of both LMB and LMB10 treads are similar,the contact spot area near the nominal rolling circle is the largest and the contact stress is the smallest,which increases rapidly after approaching the rim area.
万方数据
维普
