Abstract
To study the influence of wheel polygonization on the dynamic stress of the wheel axle, a vehicle-track rigid-flexible coupling dynamic model was established. In the model, the wheelset, axle box, and track system were modelled as flexible bodies to consider the influence of elastic vibration. At the same time, the dynamic stress on key positions of the axle under the wheel polygonization excitation was measured on the high-frequency vibration test rig. The accuracy of the model was verified by comparison with the test results. The wheel axle stress under the excitation of the wheel polygonization with different orders, wave depths, and running speed was calculated. The results show that the wheel polygonization can increase the amplitude of the axle dynamic stress, and the larger the wave depth of the wheel polygonization, the larger the stress amplitude. When the wheel polygonization frequency is close to the frequency of the wheelset elastic vibration mode, the wheelset first-order bending and second-order bending modes have a great influence on the axle stress. The resonance vibration of the wheelset elastic modal can cause the dynamic stress on key positions of the axle increase sharply.
Highlights
With the continuous development of railway technology, high-speed railway has been developed rapidly all over the world, especially in China
The influence of the wheel polygon on axle stress was analysed by the dynamic model. e main conclusions drawn from the study results are as follows
When the wheel polygonization appears, it will have a significant impact on the axle dynamic stress, that is, a highfrequency component induced by the wheel polygonization is superimposed. e larger the polygon wave depth, the larger the wheel axle stress amplitude
Summary
With the continuous development of railway technology, high-speed railway has been developed rapidly all over the world, especially in China. By building the dynamic model of the ICE-1 high-speed train, Morys et al [7, 8] studied the production mechanism and evolution law of wheel polygonization. By building a vehicletrack dynamics model with flexible wheelset model, Wu [19, 20] studied the influence of wheel polygonization on wheel-rail force and axle damage and pointed out that wheel polygonization can stimulate the bending modes of wheelsets, causing adverse effects. Wang [21] studied the influence of wheel polygonization on vehicle system dynamics and proposed corresponding safety limits based on wheel-rail vertical forces. Previous studies on the influence of wheel polygonization mostly focused on the influence of vehicle dynamics parameters, such as the wheel-rail vertical force and the ride comfort.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
