Numerical Simulation Methods of Railway Track Irregularities

Abstract

In order to improve the reliability that the power spectrum densities of railway track were transformed into time domain samples by numerical simulation methods,the principles and steps of the methods were analyzed,some simulation samples in time domain were achieved by simulating programs respectively,the samples were taken as the inputting disturbances of a vehicle vertical dynamics model,the time response courses of vehicle system were obtained by numerical simulation.The comparison of simulation results show that each simulated sample in time domain is true,the samples simulated by trigonometric series and IFFT method have little discretenesses,but the samples simulated by white noise filter and secondary filter method have greater discretenesses and are not feasible to act as the track disturbances of studying non-linear system time response.1 tab,3 figs,10 refs.