Abstract
In this paper, a simplified torsional vibration model of drive system with three degrees of freedom is established, and the elasticity of wheelset is considered. In addition to the same wheel-rail adhesion condition for the two wheels, the different wheel-rail adhesion conditions for the two wheels have been considered for the first time, and the mechanism of the vibration forms is explained from the viewpoint of energy. The nonlinear system is linearized at the origin (equilibrium position), and the critical stability curve of the linearized system is drawn according to the eigenvalues of the linearized system in the state space. The results show that the vibration forms of the system are mainly determined by the relationships between the average creep rate and the critical creep rate of the wheel driven directly by motors. When the resistance moments do positive work on the system, they input energy to the system, and the responses do not tend to the origin and produce self-excited vibration. When the resistance moments do negative work on the system, they dissipate energy to system, and the responses tend to the origin. For the linearized system at the origin, the system is more stable at the origin when following factors occur, a gentler negative slope of the adhesion curve, a faster speed, a lighter wheel load, and a larger the moment of inertia of wheels.
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Recommended by Associate Editor Sungsoo Na
Kun Xu is a Ph.D. student at State Key Laboratory of Traction Power in Southwest Jiaotong University, People’s Republic of China. His major is specialized in nonlinear dynamics in vehicle system.
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Xu, K., Zeng, J. & Wei, L. An analysis of the self-excited torsional vibration of high-speed train drive system. J Mech Sci Technol 33, 1149–1158 (2019). https://doi.org/10.1007/s12206-019-0214-4
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DOI: https://doi.org/10.1007/s12206-019-0214-4