Dynamic Study On The Locomotive Wheel And Fixed Frog Of Heavy Rail

With the world demand for heavy haul railways transport, the research on heavy haul railways is increasing. As a vulnerable spot in heavy haul railway line, turnout becomes the focus of all study.The structural of turnout is complex, so the railways transport mode do it a great harm. For reducing the heavy transport costs, ensuring the safe operation and optimizing the profile, study of the relationship between wheels and turnouts is very important.In view of the wearing of fixed frog using in Datong-Qinhuangdao line, this paper analysis the abrasion between locomotive wheel and frog and dynamic performance when locomotive get through frog. The finite element models of the standard locomotive wheel and abrasion middle locomotive wheels contacting with the abrasion frog are all established. Through a lot of elastic-plastic contact calculation,it is analyzed of the changes laws of the Contact spot and the Von Mises stress. The contact paths and vertical displacement of the axle center are also analyzed. The locomotive-turnout dynamic model is established. The vertical force, axie vertical displacement, rolling circle radius and wear power are calculated and analyzed.The dynamic performance of different wheels and frogs are compared. All those study make a contribution to reducing the wear and optimizing the profile.The contact area between worn wheel and frog is larger than it between standard wheel and frog,which indicate that the worn wheel match the worn frog better. When the wheels pass the wing rail to the point rail, the Von Mises stress of crossing increases from 900 MPa to 1300 MPa, which is larger than material yield strength to make the wheel and frog enter the stage of plastic deformation.This situation correspond to the scene.The maximum vertical displacement of the axle center is 8mm, which deteriorates the wheel / rail contact irregularity and increases the frog abrasion.The dynamic load between wheel and rail can be 3.5 times of the static load and increases with the speed. As the locomotive get through the frog, the maximum vertical displacement of axie is mutation, which will deteriorates the wheel/rail contact irregularity. When the wheel contact with the nose rail and wing rail simultaneously, the rolling circle radius on the nose rail is greater than it on the wing rail. It produces sliding friction between wheel/rail. The maximum vertical force and abrasion power between wear wheel/frog are less than the standard JM3 wheel. It shows that the abrasion wheel ’s dynamic performance is superior to the standard JM3 wheel. The maximum vertical force, rolling circle radius difference and abrasion power between standard wheel/frog are less than the corresponding dynamic parameters between wear wheel /frog,which shows that the standard frog’s dynamic performance is better than the wear frog.