Study on Excitation Model for Wheel/Rail Rolling Noise

In order to solve the problem of wheel/rail high frequency non-linear contact and predict wheel/rail rolling noise,study on wheel/rail surface roughness model in time domain is necessary.On the basis of the description of wheel/rail surface roughness spectrum in frequency based on traditional linear theory, models of wheel/rail surface roughness in time-domain form by frequency-time transformation were established to meet the needs of studying wheel/rail non-linear contact.As an example,by inputting the surface roughness of Sato in time domain to the model of wheel/rail noise and the prediction software named STTIN developed by the author,wheel/rail rolling noise simulation was carried out.By comparing the spectrum and time-domain characteristic of wheel/rail rolling noise obtained by simulation with the results measured in real cases,the reliability of the model is verified.