Research on the Impact of Wheel Polygonalization on Metro Bogies

Abstract

Objective The objective is to investigate the impact of wheel polygonalization on metro bogies, thereby strengthening the control requirements for wheel polygonalization, and enhancing the operational quality and safety performance of bogies. Method Based on the introduction of the concept of wheel polygonalization and the mathematical expression of polygonalization using methods such as wheel off roundness testing, modal testing, vibration testing, and stress testing, type of metro is comparativety tested. Result & Conclusion According to the test data: wheel polygonalization can cause main frequency vibration of the axle box position; wheel polygonalization can amplify the magnitude of axle box vibration, with the test object containing obvious wheel polygonalization resulting in an 18% increase in axle box vibration; when the excitation frequency of wheel polygonalization is close to the structural modal frequency, the structural stress will increase significantly, with the stress at key measuing points increasing by more than twice, indicating that wheel polygonalization has a significant impact on structural strength.

Keywords

• metro vehicle
• wheel polygonalization
• vibration
• structural strength