Volume 35 Issue 6
Jun.  2020
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Article Navigation >  Journal of Aerospace Power  > 2020  >  35(6): 1222-1227
CHEN Xueqi, MA Yanhong, WANG Yongfeng. Failure analysis on central drive bevel gear of turbo-shaft engine with complex excitation[J]. Journal of Aerospace Power, 2020, 35(6): 1222-1227. doi: 10.13224/j.cnki.jasp.2020.06.012
Citation: CHEN Xueqi, MA Yanhong, WANG Yongfeng. Failure analysis on central drive bevel gear of turbo-shaft engine with complex excitation[J]. Journal of Aerospace Power, 2020, 35(6): 1222-1227. doi: 10.13224/j.cnki.jasp.2020.06.012
shu

Failure analysis on central drive bevel gear of turbo-shaft engine with complex excitation

doi: 10.13224/j.cnki.jasp.2020.06.012
  • 1.

    School of Energy and Power Engineering,Beijing University of Aeronautics and Astronautics,Beijing 100191,China

  • 2.

    Research Institute of Aero-Engine,Beijing University of Aeronautics and Astronautics,Beijing 100191,China

  • Received Date: 2019-10-25
  • Publish Date: 2020-06-28
    Abstract
  • A fatigue failure of the central driven bevel gear was found at the front end of the high pressure rotor of a small turbo-shaft engine. Taking into consideration of both the gear teeth meshing and rotor-gear coupling vibration, the vibration response of the driven bevel gear under the combined influences of tooth surface meshing excitation and rotor lateral vibration excitation was investigated. The analysis results showed that the gear teeth meshing caused the 5th nodal diameter shape vibration, while the coupled vibration of the rotor-driven gear system led to a 2× excitation and then excited the swing shape vibration of the driven bevel gear. Meanwhile, the additional constraints arousing from the gear teeth meshing changed the vibration stress distribution of the swing shape vibration, which then forced the fatigue crack to propagate radially through the gear. The distribution of vibration stress is consistent with the phenomenon of the driven gear fatigue failure, which proves the correctness of the failure mechanism analysis.

     

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