Analysis Of Rolling Contact Behavior Of Elastic Wheels

With the urbanization,the demand for urban rail vehicles is increasing,and the attendant problems such as comfort and wheel-rail noise have attracted widespread attention.Due to the embedment of a layer of rubber between the rim and the wheel core,the elastic wheel has formed a third-stage suspension,which can effectively reduce the wheel-rail interaction and reduce the noise of the wheel and rail.It has been widely used on rail vehicles in many cities at home and abroad.The development of the computer level has provided the conditions for calculating the wheel-rail transient contact behavior by displaying the finite element method.In this paper,finite element software was used to investigate the relationship between stress and dynamic response under steady-state conditions and transient conditions of elastic wheels.The main contents are as follows:1.Based on certain types of compression-shear composite elastic wheels,the factors that are prone to fatigue failure of the fastening bolts are optimized.The design of the boss and the updated locking system optimize the structure of the elastic wheels and determine the parameters of each material,respectively using ANSYS.A stable finite element model and a finite element half-round model have been established with LS-dyna.2.According to the relevant standards,the load condition of the ANSYS steady-state finite element model was determined,and the pre-installed stress and static strength of the elastic wheel were checked.The results show that the elastic wheel meets the requirements.3.The influence of the three parameters of the wheel type,the length of the rail joint and the running speed on the dynamic performance of the wheel when the elastic wheel passes through the rail joint is studied.The results show that the elastic wheels can greatly reduce the wheel-rail force when passing through the rail joints.The wheel-rail force also increases with the increase of the speed and the length of the rail joints.The increase of the length of the rail joints has a greater impact on the wheel-rail forces and accelerations.The influences of three parameters,such as wheel type,length of track and running speed,on the dynamic performance of the wheel when the elastic wheel passes through the wrong tooth are studied.The calculation results show that the height of the wrong tooth is positively correlated with the wheel-rail force,acceleration,and rim stress,and increases with the height of the wrong tooth.Among them,the impact on the wheel transient response is more obvious when the wrong teeth on the wheel meet the wrong teeth.The elastic wheels can significantly optimize the dynamic performance of the wheelset and significantly reduce the stress at the wheel rim.The dynamic response of wheelsets in the interval from 50km/h to 80km/h is obvious,and the dynamic response is stable at 80km/h~120km/h.Relatively small wheel type and wrong tooth height.