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ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 2022, Vol. 43 ›› Issue (6): 526123.doi: 10.7527/S1000-6893.2022.26123

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An overview of noise source control technology for helicopter main gearbox

ZHA Jianping, WANG Fengjiao, GUO Junxian, LI Mingqiang   

  1. China Helicopter Research and Development Institute, Jingdezhen 333001, China
  • Received:2021-07-16 Revised:2022-03-14 Online:2022-06-15 Published:2022-03-11
  • Supported by:
    National Level Project

Abstract: Internal acoustic comfort of the helicopter is seriously affected by the main gearbox noise. In this paper, the development status of the noise source control technologies in the gear, gear shaft, bearing and casing, including passive, active, and semi-active control methods, is summarized based on an introduction of the internal structure characteristics of the main gearbox. The existing research results show that source control can achieve overall noise attenuation of more than 10 dB for the helicopter main gearbox under the demand of lightweight, and is a key technology for improving the noise environment in the cabin. Considering the increase of the demands for helicopter internal acoustic comfort, some future research directions in this field are also discussed in terms of noise analysis, noise control and noise testing techniques, providing insights for the development of noise source control of the main gearbox.

Key words: helicopter, main gearbox, noise source, cabin noise, noise reduction

CLC Number: