Basic Test And Dynamical Analysis For Elastic Sleeper

Ballasted track is a basic track structure used on the railway lines in china. To satisfy the requirements of society and economy, trains have been speed-up five times on the existing railway lines, and now the departments of railway are making preparations for the sixth. At the same time the high speed lines for passenger transport are prepared to be constructed in order. So the conventional ballasted track must be intensified for high speed and heavy haul railway line, this is a chance for the elastic sleeper.Sleeper pads are resilient elastic pads which are mounted on the base of the sleepers. In this thesis, the material, physical performance and shape of sleeper pads are studied, the sleeper pads stiffness is calculated approximately, and how to produce the elastic sleeper is also discussed. By the contrast test it shows that the ballast lateral resistance the sleeper supporting stiffness, the sleeper load moment the ballast subsidence character and the sleeper pads fatigue wear capability of elastic sleeper are more excellent than these of conventional sleeper. The program is accomplished on the base of vehicle and track coupling dynamics theory. Applying this program the dynamical responses of each component in the vehicle and track system were calculated and in despite of elastic sleeper track or conventional sleeper track. These dynamical responses were be analyzed one by one for the two kinds track, also contrasted power spectral density of the part of responses, and researched the trend of all dynamical responses with the sleeper pads stiffness changed or the train speed raised. It reduces the average load on the ballast and the subgrade which axle loads are distributed over a greater number of sleepers, and reduces the direct dynamic forces and vibrations on ballast and helps prevent track subsidence. So the elastic sleeper can improve the long-term life cycle of the track structure and the ballast. Lower loads on the ballast leads to slower deterioration of the ballast from wear and breaking up. Consequently, settling of the ballast is reduce which helps prevent problems associated with track subsidence. This allows for...