| With the development of heavy-haul railway lines in China,the freight transportation capacity has been greatly improved.Due to its large traffic volume and high density operating conditions,the wheel and rail operating environment is quite terrible,which leads to the emergence of abnormal diseases of certain lines,which greatly increase the cost of line aintenance.In order to prolong the service life of the rail,the design of asymmetric grinding surface of the rail is realized on the basis of the actual grinding surface,and the grinding mode of the rail grinding surface is given.This article is based on the research methods of scholars at home and abroad,based on the representative profile of the wear rail of the curved section of the heavy-load railway,A multi-arc rail profile design method is proposed,which is solved by particle swarm optimization,and finally the rail asymmetrical grinding profile is obtained and evaluated.Finally,the design profile is used as the grinding target,and multiple grinding heads are used to carry out the grinding simulation study on the representative profile of the wear rail.Its main work content and innovations are as follows:1.To collect the data of the actual operation line of the vehicle,the selection of wear representative face asymmetric surface design provides guidance.Polar coordinates were used respectively to arithmetic average method and Fréchet distance method for data processing,by calculating the distribution density function of the wheel-rail contact point of the curve radius R800 line,it is concluded that polar coordinates of arithmetic average method and the abrasion of type about the contacts between the surface and the measured data distribution density function curve similarity are 83.43%and 85.23%,respectively;and that of Fréchet distance method is 71.08%and 81.43%.it is determined that the arithmetic average method in the polar coordinate system is used to process the representative profile of wear,which can better express the wear characteristics of the rail.2.In this paper,the design method of multi-arc rail profile is put forward.The objective function is the transverse distribution density function of the wheel and rail contact point and the reduction of the lateral force of the wheel shaft.The optimized parameter boundary condition is based on the representative surface of wear rail.An asymmetric rail grinding profile design model was established,and the model was solved by particle swarm optimization(PSO),and the asymmetric grinding profile was obtained.3.For the design of asymmetric abrasion grinding dynamics performance evaluation on the rail surface,Wear analysis and finite element analysis result,the results show that the effect of wheel and rail is fierce line segment,the design of asymmetric type face train dynamics performance improvement effect is bigger than standard grinding profile promotion effect,in the big radius of the curve segment,the dynamic effect of the standard polished profile and the asymmetric profile is not much different.In general,there is little difference between the dynamic performance of the standard polished surface and the designed polished surface.When the designed polished surface was adopted,the area of wheel-rail contact spot increased by3.53%.The maximum contact stress of wheel and rail is reduced by 1.52%.The designed rail profile can reduce wheel and rail wear and improve the wear distribution characteristics.4.Taking the actual grinding profile as the object of grinding,the law of grinding angle,width of grinding band and grinding area under different grinding depth was analyzed.On the one hand,according to the designed grinding profile,the grinding removal amount of the left and right attrition rails is calculated as S_L=51.09mm~2and S_R=20.91mm~2,respectively.On the other hand,based on the grinding range of GMC-96 grinding train,the representative grinding profile of the designed asymmetrical profile is guided to carry on the simulation design of the wear rail representative profile. |
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