The dynamic resonance under multiple flexible wheelset-rail interactions and its influence on rail corrugation for high-speed railway

Abstract

The wheel-rail dynamic resonance (W-RDR) under multi wheelset-rail nonlinear interactions in the mid-high frequency range is still unclear regarding wheelset flexibility, wave transmissions and reflections (W-TF) among each wheel-rail interaction. To clearly elucidate W-RDR and its induced modes, a double vehicle-track coupled dynamic model of multiple flexible wheelset-rail interactions is established. The validity of the model in the mid-high frequency range is verified by comparing the simulated axlebox acceleration with the measured data. Then, the W-RDR (vertical force, friction power) is calculated and analyzed. Furthermore, the W-RDR under the single/ double/ multiple wheelset-rail interactions is compared and the rail bending modes between bogie wheels are proposed. The influence of wheelset flexibility and W-TF among each wheel-rail interaction on W-RDR are clarified. Finally, the initiation mechanism of rail corrugation is revealed based on corrugation growth rate. The results show that the wheelset flexibility has limited influence on vertical force resonances but significant contribution to friction power resonances. The W-TF between bogie wheels produce three rail local bending modes. The W-TF between wheels of adjacent bogies further intensify response peaks but do not generate new resonances. The W-RDR is mainly caused by the P2 resonance mode, the rail bending modes between bogie wheels and the wheelset bending modes. The rail 3rd-order bending, pinned-pinned resonance between bogie wheels and the wheelset 2nd antisymmetric bending resonance are key factors in corrugation initiation. Moreover, the wheel-rail resonance at the bogie leading wheelset is more prone to produce corrugation than that at the rear wheelset.