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PROCEEDINGS OF THE THIRD INTERNATIONAL CONFERENCE ON RAILWAY TECHNOLOGY: RESEARCH, DEVELOPMENT AND MAINTENANCE
Edited by: J. Pombo
Structural Durability Analysis of High Speed Train Cast Aluminium Gearbox Housing
G.Q. Li1, L.Q. Lu1, W.J. Wang1, X. Wang1 and X.J. Zhang2
1School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, China
G.Q. Li, L.Q. Lu, W.J. Wang, X. Wang, X.J. Zhang, "Structural Durability Analysis of High Speed Train Cast Aluminium Gearbox Housing", in J. Pombo, (Editor), "Proceedings of the Third International Conference on Railway Technology: Research, Development and Maintenance", Civil-Comp Press, Stirlingshire, UK, Paper 324, 2016. doi:10.4203/ccp.110.324
Keywords: gearbox, wheel-rail excitation, vibration characteristic, high speed train.
The gearbox is a key transmission component of the high-speed train traction system. It suffers impacts mainly from the track irregularity, which induces the fatigue cracks in service. The crack macro-analysis of gearbox fracture section is demonstrated and the result show that the fatigue crack initiates from the inside corner of the gearbox, where the cast defects exist. Using the online test the dynamic stress and the vibration acceleration of the gearbox were obtained under the new wheel and the worn wheel situation. Simultaneously the modal behaviour of the gearbox was analysed. The research shows that the exciting frequency from the track irregularity is mixed with the gearbox natural frequency and resonance of the gearbox housing occurs, which induces the high dynamic stress amplitudes and the housing fatigue crack appears. The equivalent stress under the new wheel situation is less than that of worn wheel, which indicates that the state of wheel has a great impact on the housing fatigue crack. The analysis is helpful to ensure that the high speed train runs safely and provides a reference for the design of new gearbox housing.
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