Characteristics and control limit of wheel-rail high-frequency vibrations induced by periodic short-wave irregularities under higher operating speed

Abstract

With the increasing speed of high-speed trains, the periodic short-wave irregularities caused by high-frequency vibration between wheel and rail inevitably cause potential severe damages to vehicle and track components. To gain an insight into the attenuation pattern of high-frequency vibration in the bottom-up transmission, it is necessary to investigate in-depth the vibration characteristics of the coupled vehicle system under high-frequency excitation. First, the spectrum of track irregularities with a wide frequency range is obtained via regression analysis of collected real measured data. Inversion analysis is followed conducted to obtain samples of irregularities within wavelength range of 0.002–100 m. Next, a rigid-flexible wheel-rail coupling dynamics model is built with the wheelset and the rail adopting elastic bodies. High-frequency vibration characteristics of the wheel and rail caused by periodic short-wave irregularities are then simulated and analyzed. The results show that the vibration of the vehicle components distributes in the frequency range of 30–1390 Hz, and the vibration attenuates from the bottom layer to the top layer. Finally, the quantitative limit value for the typical wavelength of periodic short-wave irregularities under the train speed of 400 km/h is further precisely calculated by extracting the influence of the amplitude variations of periodic short-wave irregularities on the wheel-rail interaction.

Keywords

high-speed railway / short-wave irregularities / whole wavelength (WWL) irregularities / vehicle dynamic responses / power spectrum density

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