ACTA AERONAUTICAET ASTRONAUTICA SINICA >
Research on gearbox periodic strut for helicopter cabin noise reduction
Received date: 2015-12-01
Revised date: 2016-02-19
Online published: 2016-03-01
Supported by
Foundation of State Key Laboratory of Rotorcraft Aeromechanics (61422200402162220003)
High-frequency harmonic vibration generated by meshing gear pairs is a significant source of helicopter cabin noise, which can be controlled by suppressing the vibration transferred to the fuselage. A series/parallel complex gearbox periodic strut for helicopter interior noise reduction is brought forward in this paper. The periodic strut exhibits good ability of broadband vibration attenuation, and can satisfy the intensity and stiffness required by the helicopter. A dynamical model is established based on spectral finite element method. The stiffness and intensity analysis models are then developed based on experiential formula. The effects of the main design parameters are obtained. A complex gearbox periodic strut is designed for a certain light helicopter. The simulation results show that the complex gearbox periodic strut proposed can meet the required intensity and stiffness. In addition, the maximum displacement transmissibility from one side to the other side of the strut exceeds 60 dB in the frequency range from 500 to 2 000 Hz, verifying the feasibility of the strut.
Key words： helicopter; cabin noise reduction; periodic strut; gearbox; vibration
WANG Fengjiao , LU Yang . Research on gearbox periodic strut for helicopter cabin noise reduction[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2016 , 37(11) : 3370 -3384 . DOI: 10.7527/S1000-6893.2016.0048
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