Analysis of Cracking Causes at Grounding Terminals of Bogie Axle-end and Resolution Measures

Abstract

[Objective] Due to continuous changes in the operating conditions of metro lines, abnormal vibrations between wheel and rail s occasionally occur, leading to fractures in the suspension components at the bogie axle-end and affecting the safety of train operation. Therefore, it is essential to conduct research on the fracture mechanisms of the axle-end suspension components. [Method] Taking the grounding terminals of bogie axle-end grounding cables of a metro train as an example, through line testing and data analysis, the reasons for grounding terminal fractures are analyzed, resolution measures involving mis-frequency design is proposed, and the feasibility is verified through on-site testing. [Result & Conclusion] The proposed resolution measures can reduce the stress at the grounding terminals from 90 MPa to approximately 30 MPa, significantly improving the stress state of the grounding terminals and enhancing their fatigue life.

Keywords

• metro
• bogie
• grounding terminal