The Influence Of Wheel-rail Periodic Wear On Gear Transmission System Of High-speed Train

With the development of China’s high-speed railway,the increasing complexity of high speed railway operation environment and the increase of the train speed,the phenomenon of wheel-rail periodic wear becomes more and more prominent.It is the wheel-rail periodic wear that causes the impact between wheel and rail to intensify and the vibration of many components of high-speed train,especially the gear transmission system under the spring,becoming fierce.In addition,there have been many cases of gear transmission system failure,which seriously threaten the safety of high-speed trains.Therefore,it is of great significance to research the influence of wheel-rail periodic wear on the gear transmission system of high-speed train to ensure the safe service of the gear transmission system.In this paper,the gear transmission system of high-speed train is studied as follows:Firstly,the rigid flexible coupling dynamic model of high-speed train with gear transmission system is established in SIMPACK multi-body dynamics software and ANSYS finite element analysis software,considering the factors such as gear shape,time-varying meshing stiffness,dynamic transmission error,actual structure of gear box,elastic deformation of gear box,roller number of rolling bearing and contact between inner and outer rings.At the same time,considering the elasticity of sleeper and under rail,the track double-layer support model is established.Then,the characteristics of wheel-rail periodic wear are introduced.The harmonic function is used to simulate the wheel polygonal excitation,and the rail corrugation excitation data is output by MATLAB software.By analyzing the internal meshing state of the gear transmission system and the vibration response of the gearbox in time domain and frequency domain,the influence of wheel polygon order and wave depth on the gear transmission system at different speeds and the influence of rail corrugation wavelength and wave depth on the gear transmission system at different speeds are systematically summarized.The influence of wheel polygonal excitation and rail corrugation excitation on the gear transmission system is compared.At the same time,the relationship between wheel-rail periodic wear excitation and box resonance,as well as the influence of wheel-rail periodic wear excitation on gear transmission system under resonance and non-resonance conditions,are analyzed.Finally,the influence of wheel-rail composite excitation on gear transmission system is analyzed.Based on the time and frequency domain analysis of the response,the rules of the response values of the gear transmission system with the increase of polygon order or the decrease of corrugation wavelength under the wheel-rail composite excitation is summarized,and the rules are compared with those under wheel polygonal and rail corrugation excitation.The results show that response values of the gear transmission system are positively correlated with the wave depth of wheel-rail periodic wear under the wheel-rail periodic wear excitation,namely,wheel polygon,rail corrugation and wheel-rail composite excitation.With the increase of the polygon order and the decrease of the wave wavelength,the response values of the gear transmission system increase when the wheel-rail periodic wear excitation frequency is close to the resonance frequency,and decrease when it is far away from the resonance frequency.Under the same velocity and wave depth,wheel polygon excitation and rail corrugation excitation are compared and analyzed.It is also found that wheel polygon excitation has a greater influence on the gear transmission system.Through comparison,it is found that the wheel-rail composite excitation has a worse effect on the gear transmission system than the wheel polygon excitation and the rail corrugation excitation,which is mainly reflected as follows:under the wheel-rail composite excitation,the response values of the gear transmission system are significantly improved in the time domain and the fluctuation is more severe,and the frequency component is more abundant in the frequency domain.