用于直升机舱内降噪的新型径向周期撑杆研究

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振动与冲击 ›› 2023, Vol. 42 ›› Issue (4) : 286-294.

论文

王风娇1，李明强1，彭海锋1，陆洋2

作者信息 +

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

WANG Fengjiao1, LI Mingqiang1, PENG Haifeng1, LU Yang2

Author information +

文章历史 +

摘要

利用周期结构的宽频阻带特性，结合橡胶材料的剪切性能，提出了一种新型径向主减速器周期撑杆构型，抑制主减速器中高频振动向机体的传递，进而实现直升机舱内降噪。基于该构型，利用轴对称单元、胡克定律和虚位移原理推导得到了其径向子单元的等效刚度和质量，并进一步推导得到了整个撑杆的动力学和静力学分析模型；在此基础上，通过参数分析研究，获得了径向周期撑杆主要设计参数对阻带特性和刚度特性的影响规律，以此为依据设计得到了一种满足某型机使用需求的样例径向周期撑杆；进一步从刚度强度、减振和降噪三方面进行仿真分析，验证了该技术方案具有在直升机上应用的可行性和有效性，在500~4000Hz频率范围内宽频降噪效果明显，最大可达40dB。

Abstract

Based on the stopband characteristics of 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 the noise reduction in helicopter cabin. For this configuration, the equivalent stiffness and mass of the radial sub-element were derived using the axially symmetric element, Hooke's law and 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 is obtained through the 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 helicopter. The results show that the broadband noise attenuation is obvious and up to 40dB in the frequency range of 500-4000Hz.

导出引用

王风娇1，李明强1，彭海锋1，陆洋2. 用于直升机舱内降噪的新型径向周期撑杆研究[J]. 振动与冲击, 2023, 42(4): 286-294

WANG Fengjiao1, LI Mingqiang1, PENG Haifeng1, LU Yang2. A study on a novel radial periodic strut for noise reduction in a helicopter cabin[J]. Journal of Vibration and Shock, 2023, 42(4): 286-294

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