Study Of Rail Grinding Profile

Railway system is a transport system based on wheel-rail contact. Rail played an important role in this system. Due to it must support considerable weight, it emergence of various destruction inevitably. Rail grinding is an important means of maintenance. Through rail grinding, not only to restore rail section shapes, but also with an aim to change its shape to the poupers of prevent the occurrence of rail failure and improvement the wheel-rail contact performance. Therefore, the study of rail grinding profile will have a strong practical value. This article do some study on rail grinding profile as followed:1. Based on the vehicle-track coupling dynamics theory, using field measurement data of rail profile, we analyse the vehicle's curving performance while the outside rail is wear. The result shows the wear rail is not suit for the original wheel, it will affect the vehicle's curving performance significantly, even it maybe evev lead to an anccident.2. With an aim to reduce the normal gap of wheel and rail, search a rail grinding profile of low contact stress level of wheels/rails, and support the theory foundation of rail grinding project. The optimization scope of the rail head is determined based on the theory of three-dimensional elastic bodies rolling contact with non-Hertzian. In the scope, the minimum gap forms between the original wheel and the improved rail when the wheelset shifts transversely. To mitigate the damage of the wheels and rails served in railways, this present method is utilized to optimize the profile of CHN60 rail. The theory of vehicle-track coupling dynamics and three-dimensional elastic bodies rolling contact with non-Hertzian are used to analyze the contact behavior of the wheel/rail before and after the rail profile optimization, in static and dynamic state. The results show that the optimized rail profile is in good conformal contact with LM wheel, which reduces wheel-rail contact stress significantly without sacrificing the dynamic performance, and the wear status of the left wheel-rail are decline. Therefore, the wear of the wheels and the rails can be decreased effectively by using the optimized rail.3. Analyse and introduce the type of rail defects in high-speed railway, consider that if grind the rail defects in the initial stages we can control the defects and extend the rail life. Then according to the location, size and other characteristics of defects, adopt empirical design method to design a rail profile of preventive rail grinding suit for high-speed railway, and describe the process of its construction. Subsequently use SIMPACK software package and CONTACT numerical procedure to analyse its dynamic performance and contact mechanical performance. The results show that the design of preventive rail grinding profile is little difference with the original profile, in line with expectation.