A study on a novel radial periodic strut for noise reduction in a helicopter cabin

被引：0
|
作者：
Wang F. [1 ]
Li M. [1 ]
Peng H. [1 ]
Lu Y. [2 ]
机构：
[1] China Helicopter Research and Development Institute, Jingdezhen
[2] College of Aerospace Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing
来源：
Zhendong yu Chongji/Journal of Vibration and Shock | 2023年 / 42卷 / 04期
关键词：
cabin noise reduction; helicopter; main gearbox; periodic strut; vibration;
D O I：
10.13465/j.cnki.jvs.2023.04.034
中图分类号：
学科分类号：
摘要：
Based on the stopband characteristics of a periodic structure as well as the shear performance of rubber material, a new radial periodic strut for main gearbox was proposed to suppress the transmission of high frequency vibration from the main gearbox to the fuselage, which is able to realize noise reduction in a helicopter cabin. For this configuration, the equivalent stiffness and mass of the radial sub-element were derived using the axially symmetric element, The Hooke' s law and the virtual displacement principle, and the dynamic and static analysis models of the whole strut were further derived. On this basis, the influence of the main design parameters of the radial periodic strut on the stopband characteristics and the strength and stiffness characteristics was obtained through parameter analysis. Subsequently, a sample strut was designed to meet the requirements of a certain helicopter model. Simulation analysis was then carried out from three aspects of vibration reduction characteristics, stiffness and strength to verify the feasibility and effectiveness of the proposed scheme in the application of the helicopter. Results show that the broadband noise attenuation is obvious and up to 40 dB in the frequency range of 500 -4 000 Hz. © 2023 Chinese Vibration Engineering Society. All rights reserved.
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页码：286 / 294
页数：8
相关论文
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