Volume 34 Issue 5
May  2019
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Vibration characteristics analysis for helicopter main gearbox considering strutural flexibility[J]. Journal of Aerospace Power, 2019, 34(5): 1020-1028. doi: 10.13224/j.cnki.jasp.2019.05.007
Citation: Vibration characteristics analysis for helicopter main gearbox considering strutural flexibility[J]. Journal of Aerospace Power, 2019, 34(5): 1020-1028. doi: 10.13224/j.cnki.jasp.2019.05.007
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Vibration characteristics analysis for helicopter main gearbox considering strutural flexibility

doi: 10.13224/j.cnki.jasp.2019.05.007
  • Received Date: 2018-08-31
  • Publish Date: 2019-05-28
    Abstract
  • The helicopter main gearbox was taken as the research object, the finite-element/lumped-parameter hybrid method was used to establish a hybrid dynamic model of a helicopter main gearbox, by considering the flexibility of the shaft and housing. The specific influence of the flexible housing structure on the vibration characteristics of the main gearbox was studied. Results demonstrated that, after considering the structure of the flexible housing, the natural frequency of each order was significantly decreased, the mode shape of the system was changed obviously, and the amplitude of the resonance peak of the system was decreased and the number of resonance speed was reduced. The flexible housing structure had little influence on the dynamic meshing force, but had a greater impact on the bearing reaction force. It can be divided into three categories: the fluctuation amplitude decreases, basically remains unchanged and increases, and the judgment criteria were given. The results lay a foundation for the vibration reduction, noise reduction and dynamic performance optimization of the helicopter main gearbox.

     

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