Gearbox fault diagnosis of high-speed railway train

• Both experimental data and theoretical analysis used in this paper.
• Results show a structural resonance occurs at the gear box.
• Possible origins of the crack is discussed.
• The suggestions for resolving the problems of cracks were proposed in this paper.

This paper is aimed at detecting crack faults of a lubricant level viewport and upper viewport of a high-speed railway train gear box operating for a repair cycle from 200,000 to 300,000 km. This paper reports a series of test results involving vibration and dynamic stress tests to identify the occurrence of partial resonance and stress concentration points of the gear box structure under external excitation tests. The results of the tests were confirmed using both finite element analysis and modal analysis. This paper also describes the causes of the crack fault on the gear box body and provides a comprehensive analysis of the causes of the gearbox crack. With this approach the faults on the high-speed train gearbox structure were identified and corrective solutions suggested.