Open Access

ARTICLE

Sound Transmission Loss of Helmholtz Resonators with Elastic Bottom Plate

by Liang Yang^1,2, Jie Zhang¹, Jinfeng Xia¹, Siwen Zhang¹, Yang Yang³, Zhigang Chu^2,*

1 State Key Laboratory of Intelligent Vehicle Safety Technology, Chongqing Changan Automobile Co., Ltd., Chongqing, 401133, China
2 College of Mechanical and Vehicle Engineering, Chongqing University, Chongqing, 400044, China
3 Chongqing Automotive Power System Testing Engineering Technology Research Center, School of Vehicles Engineering, Chongqing Industry Polytechnic College, Chongqing, 401120, China

* Corresponding Author: Zhigang Chu. Email:

Sound & Vibration 2024, 58, 171-183. https://doi.org/10.32604/sv.2024.056968

Received 03 August 2024; Accepted 30 September 2024; Issue published 21 October 2024

Abstract

Helmholtz resonators are widely used to control low frequency noise propagating in pipes. In this paper, the elastic bottom plate of Helmholtz resonator is simplified as a single degree of freedom (SDOF) vibration system with acoustic excitation, and a one-dimensional lumped-parameter analytical model was developed to accurately characterize the structure-acoustic coupling and sound transmission loss (STL) of a Helmholtz resonator with an elastic bottom plate. The effect of dynamical parameters of elastic bottom plate on STL is analyzed by utilizing the model. A design criterion to circumvent the effect of wall elasticity of Helmholtz resonators is proposed, i.e., the structural natural frequency of the wall should be greater than three times the resonant frequency of the resonator to avoid the adverse effects of wall elasticity. This study can provide guidance for the rapid and effective design of Helmholtz resonators.

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Keywords

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