Abstract：The fracture problem of railway metro cowcatcher is analyzed by means of fracture analysis, finite element analysis and field test. It is determined that it is a structural fatigue problem, and it is found out that the cause of fatigue failure is the serious rail corrugation on a certain section of line. when the train passes through the section at a common speed, the wheel-rail excitation frequency is coupled with the natural mode frequency of the cowcatcher, which leads to the high vibration level of the cowcatcher, and it aggravates the propagation of the original microcrack at the weld toe of the cowcatcher. Through the optimization of the structure of the original cowcatcher, its natural frequency can effectively avoid the line excitation frequency. At the same time, the dynamic stress level of the new structure is much lower than that of the original one. The fatigue strength of the new structure meets the design life requirements of 3.6 million km for safe operation.
Key words: metro vehicle; fatigue fracture; field test; structure optimization
王石1,2，宋烨3，魏来3，张嘉3，王燕1，孙熠3，屈升3. 地铁车辆排障板故障分析及结构优化[J]. 振动与冲击, 2022, 41(20): 291-297.
WANG Shi1,2, SONG Ye3, WEI Lai3, ZHANG Jia3, WANG Yan1, SUN Yi3, QU Sheng3. Fault diagnosis and structure optimization of a metro cowcatcher. JOURNAL OF VIBRATION AND SHOCK, 2022, 41(20): 291-297.
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