Influences of wheel polygon amplitude on wheel-rail vibration and sound radiation

Abstract

Wheel polygon amplitude can greatly affect wheel-rail vibration and sound radiation. Based on multi-body dynamics theory, a vehicle-track rigid-flexible coupling dynamics model was established. According to the actual running wear condition of the wheel, the wheel-rail vibration response was calculated and analyzed (the order of wheel polygons is 20, and the polygon amplitude is 0.01/0.02/0.03/0.04 mm, respectively). Together with the finite element/boundary model of the wheel, the calculated wheel-rail force was used as an external incentive to analyze the effects of polygon amplitude on the time-frequency domain of wheel noise. The research results show that: when the polygon order is 20, with the increase of polygon amplitude, the wheel-rail vertical force and the acceleration of wheel, rail and track slab increase gradually. It’s also found that the rail acceleration is obviously more sensitive to the amplitude than the track slab acceleration, while the vertical displacement of the rail and track slab is less sensitive to the polygon amplitude. At the same amplitude, the closer to the wheel rolling line, the more obvious the sound pressure decreases with the increase of height. At different amplitudes, the sound pressure at different positions will increase with the rise of the polygon amplitude. The root mean square value of sound power increases gradually with the addition of amplitude: When the amplitude changes from 0.01 mm to 0.04 mm, the calculated sound power increases by 4.1 dB.

Vibration characteristics of defective axle box bearings in high-speed trains under track irregularity excitation

“…However, during the actual operation of high-speed trains, the axle box bearings of high-speed trains are coupled with other components, which will be subject to various external excitations, among them, wheel-rail excitation is the main source of vibration acceleration experienced by various components of the train. Such as wheel polygon [28][29][30][31][32], wheel flat scar [33][34][35], track irregularity [2,33,36,41], etc. Based on the multi-body dynamics theory, the literature [29] established a rigid-flexible coupling dynamic model of vehicle-track, analyzed the influence of polygon amplitude on the time-frequency domain of wheel noise, and the research results showed that when the polygon order is 20, with the increase of polygon amplitude, the wheel-rail vertical force and the acceleration of wheel-rail and rail plate gradually increased.…”

“…Such as wheel polygon [28][29][30][31][32], wheel flat scar [33][34][35], track irregularity [2,33,36,41], etc. Based on the multi-body dynamics theory, the literature [29] established a rigid-flexible coupling dynamic model of vehicle-track, analyzed the influence of polygon amplitude on the time-frequency domain of wheel noise, and the research results showed that when the polygon order is 20, with the increase of polygon amplitude, the wheel-rail vertical force and the acceleration of wheel-rail and rail plate gradually increased. In literature [33], a three-dimensional coupled model of vehicle axle box bearings was built using UM and Simulink to simulate the dynamic characteristics of coupling between wheel flat scar and faulty bearings.…”