Research On Wheel-Rail Rolling Noise Of Slab Track

In this paper, the worldwide present situation of study of wheel- rail rolling noise is summarized. The present situation of slab track structures and dynamics is also summarized. The actuality that the domestic study of wheel/rail noise is behind the overseas is pointed out.According to the general principles of forming model of vehicle-track coupling system, the model of coupling vibration of vehicle and slab track is developed. In the model, vehicle model is global, the affection of adjacent wheel and bogie is considered, the rail and track slab participating in the vibration is taken into account, the influence of all kinds of track parameters in the vibration of vehicle and track coupling system is also considered. Based on the Hamilton theory, the differential equation of the vertical vibration of vehicle and slab track is established. The program of solving differential equation is compiled.The shape, and development of roughness of wheel/rail is introduced.The measurement of roughness wheel/rail is illuminated.The contact aera filter and statistic description of roughness wheel/rail is analyzed. Based on the power spectrum density of roughness of wheel/rail which is presented by Sato, roughness of wheel/rail in time field is simulated, corresponding program is provided.A new numerical method of predicting whell-rial rolling noise is presented. Using this method, analysis of vibration and noise of whell/rail system because of change of track parameter is available. First, the model of coupling vibration of wheel-rail system is established; basing on the analysis of vibrating property of wheel-rail system and considering rail as moving linear radiator of sound and wheel as moving point radiator of sound, the wheel-rail rolling noise of slab track is predicted. For example, the rolling noise of slab track on Qin-Shen passenger railway is predicted. The rolling noise, caused by the influence of ground reflection, velocity of train and transmiting distance is also analyzed. From radiator and promulgating manner, the measures of damping vibration and reducing noise is presented.