Characteristics of Wheel rail Rolling Noise of Ballastless Track in High speed Railway

Abstract:

In order to predict and control wheel rail noise radiation due to running surface roughness of wheel and rail on the ballastless track in high speed railway, a model was developed based on vehicle track coupled dynamics and acoustics radiation theory to calculate and analyze the influences of ballastless track structure on wheel/rail rolling noise. The acoustics performance of wheel/rail rolling noise caused by high speed train running on the ballastless track was studied. The result shows that rail noise occurs mainly in the middle and high frequency ranges of 500～2 000 Hz; wheel noise is chiefly in the high frequency range of 1 600～4 000 Hz; slab or bed plate noise radiates in the frequency range of 125～500 Hz. The higher the vehicle speed is, the maximum wheel/rail rolling noise pressure level increases. The rail’s instantaneous noise pressure is the highest, wheel’s the second, and the slab’s the last. When a high speed train passes over the ballastless track, the distance from the railway center in the range of 5～50 m doubles, noise pressure level reduces accordingly by 3～6 dB.