The State Of Metro Rail Corrugation And Itsmitigation Measures

This paper makes an on-the-spot investigation on the rail corrugation of subway lines in different cities,tests and analyzes the rail corrugation of different curved lines through two kinds of rail irregularity instruments,and summarizes the state and characteristics of rail corrugation.The investigation results show that the state and severity of rail wave wear are different in different types of rail,and it is more concentrated in the lines with a radius of less than 800 m,indicating that the curve radius is related to the severity of rail wave wear.And the characteristics of rail wave wear wavelength are also related to track types and train passing speed.In order to understand the generation of rail corrugation in curved lines in more detail,through the joint simulation of finite element software and structural dynamics software,the whole vehicle model is established,and track irregularity excitation and rail excitation in accordance with the characteristics of track structure are added to simulate the actual road conditions.The dynamic relationship between wheel and rail is simulated,and the vertical and lateral effects of the train on the straight line are calculated and compared with the wheel-rail force in the actual line.Verify the correctness of the rigid-flexible coupling model.This model is used to calculate the changes of wheel-rail dynamic performance index and the stationarity of train operation under different outer rail superelevation,curve radius and train running speed,and to find out the influence of various parameters on rail corrugation.The improvement measures for the superelevation of the outer rail and the running speed of the train are put forward.Through the analysis of the above simulation results,the following conclusions are obtained:Several outer rail superelevation are set with different curve radius,and the influence of superelevation on wave wear is analyzed by calculating the force between wheel and rail.Under the same curve radius,the higher the raise of the outer rail,the greater the interaction and wear between the wheel and rail,so the overelevation can not be ignored in the actual line,and the wave wear has an important influence.By reducing the ultra-high value of theline,the acting force and wear between wheel and rail can be reduced appropriately,and the rail wave wear can be slowed down.Several kinds of rail corrugation with different curve radius are analyzed,and the action index of wheel and rail is analyzed.With the decrease of the curve radius,the wheel-rail force,wheel-rail wear and wheel-rail creep force all increase,indicating that the smaller the radius,the more serious the wheel-rail wear,which has an important impact on rail wave wear.The wheel-rail action index of different curve radius and different train running speed is calculated.In the same line,the train speed increases continuously,and the wheel-rail force and wear index increase,indicating that the excessive speed on the small curve radius is also one of the influencing factors leading to wave wear.By reducing the running speed of the train,the wheel-rail force and wheel-rail wear can be reduced appropriately,and the rail wave wear can be slowed down.Rail wave grinding not only aggravates the vibration of the vehicle system and causes noise,but also seriously reduces the service life of the parts,increases the maintenance of the vehicle and track,and affects the safety and comfort of the ride.