Vibration characteristics analysis of a dynamic wheelset rotor system under wheel-rail contact elastic constraint

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Journal of Vibration and Shock ›› 2023, Vol. 42 ›› Issue (22) : 230-240.

ZHOU Shengtong1,2,XIE Yangquan1,2,XIAO qian1,2,CHEN Daoyun1,2,ZHU haiyan1,2

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Abstract

Wheelset’s flexibility, gyroscopic effect, and constraint elasticity are the key to accurately evaluate the vibration characteristics of power wheelset rotor system in high-speed operation environment. To this end, the bending-torsion-axial vibration characteristics of the power wheelset rotor system in a typical high-speed train are systematically studied under wheel-rail contact elastic constraints. First of all, the bending-torsional-axial dynamic equation of power wheelset rotor system is established by the finite element theory of Timoshenko flexible beam rotor. And a linearized wheel-rail contact element which can reflect the contact characteristics between equivalent conical wheel tread and rail is derived by the stiffness influence coefficient method and energy method respectively. Then, the corresponding MATLAB codes are programmed and verified by comparing with the established equivalent ANSYS model. Next, four modal models, namely bending model, bending-torsional model, bending-axial model and bending-torsional-axial model are designed with the self-programming program. And the similarities and differences of vibration characteristics and the influence law of parameters of the four models are discussed in detail. Finally, the possible resonance stability problems of power wheelset rotor system induced by some typical external excitations are also discussed. Results show that: (1) The modal results of bending-torsional-axial model can contain all the results of the other three models, and their modal data is agree well with each other; (2) The constraint elasticity (that is, the support stiffness) of the wheelset is significantly different in the longitudinal and vertical directions due to the consideration of the wheel-rail contact stiffness, so that the first-order and second-order forward-whirling bending modes of wheelset rotor system are delayed to appear in the higher natural frequency domain, and the whirling orbits of the corresponding bending modes are obviously flat; (3) Among the discussed typical external excitations, there are many excitation frequencies which can cause the resonance of the power wheelset rotor system, especially the wheel damage excitation.

Key words

power wheelset / rotor system / finite element / bending-torsional-axial mode / wheel-rail contact elasticity

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ZHOU Shengtong1,2,XIE Yangquan1,2,XIAO qian1,2,CHEN Daoyun1,2,ZHU haiyan1,2. Vibration characteristics analysis of a dynamic wheelset rotor system under wheel-rail contact elastic constraint[J]. Journal of Vibration and Shock, 2023, 42(22): 230-240

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