Numerical Calculation and Experimental Study of Low Frequency Helmholtz Resonators with Folded Features
Helmholtz resonator can effectively suppress noise at resonance frequency.In this paper,a Helmholtz resonator with folded characteristics is proposed.Based on the finite element analysis,the transmission loss curve of the resonator in the 100-800 Hz frequency band is calculated,and the accuracy of the numerical calculation is verified through the experiment based on the transfer function method.The results show that for the same volume of the resonators,the effective frequency of Helmholtz resonator with folded characteristics is lower,and the transmission loss at the resonant frequency is up to 35 dB.The correlation analysis of the structure parameters of the resonator is carried out by using response surface methodology,and the influence of the structure parameters on the acoustic characteristics of the resonator is obtained.The research shows that the Helmholtz resonator with folded characteristics can effectively reduce the resonant frequency,and has broad application prospects in the field of low-frequency noise reduction control.
vibration and wavefinite element analysisfolding featureslow frequency noise reductionHelmholtz resonator
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