Slab Track Wheel-rail Noise And Vibration Study

With the development of the high-speed railway and the urban rail transit, the social requirement to railway noise is growing rapidly. So far, wheel-rail noise, as the main source of the railway noise, has not been further studied yet. How to reduce rolling noise is the smooth development of the high-speed railway and the urban rail transit, which can not evade this problem.In this paper, the worldwide present situation's study of wheel-rail rolling noise and slab track structures is summarized. Rolling noise generated by vibrations of both the rail and the wheel. To predict the rail's noise radiation, the receptance analysis model of the track system is built in this thesis. In this model, the rail is described by three-dimension solid element and the slab is described by elastic beam element. Based on the model mentioned above, the vertical receptance of the rail is calculated. To predict the wheel's noise radiation, a FEM analysis model of the wheel is developed. Based on the modal superposition method the radial receptance of the wheel is calculated.The power spectrum density of roughness and the contact area filter character is analyzed. Based on the power spectrum density of roughness of wheel-rail which is presented by Sato, different roughness of wheel-rail in time field is simulated, corresponding program is provided. Base on Remington's wheel-rail interaction model, the vibration characteristic of the rail and the wheel is calculated which is caused by roughness.Using Remington's wheel-rail noise prediction model and the vibration property of wheel-rail system, considering the rail as a moving linear radiator of sound and the wheel as a moving point one, the wayside rolling noise of slab track on Qin-Shen passenger railway is predicted. At the same time, the wayside noise is analyzed and compared at different speed, number of axles and roughness of rail and wheel. Based on the analysis of this thesis, the measures of vibration damping and noise reducing are presented for slab track.