Research on the inversion method for acoustic parameters of the glass wool based on impedance model

In order to obtain an accurate inversion method for acoustic parameters of the glass wool materials, the inversion effects of acoustic parameters based on different impedance models of the glass wool are studied in this paper. Four commonly used impedance models are selected for the inversion of the acoustic parameters of glass wool materials performed by GA(Genetic Algorithm), the measured acoustic absorption curves and other acoustic parameters of the glass wool samples with thicknesses of 22 mm and 44 mm are used for comparison, and the model with the best inversion effect is selected for sensitivity analysis. The error ratios of each acoustic parameter are compared in the inversion results, and the agreement of the acoustic absorption curves described by the different models with the test curves is compared, and finally the influence degree of each parameter on the acoustic absorption coefficient in the JCA(Johnson-Champoux-Allard) model is quantified and compared. It is shown that the parameter values inversed by using GA combined with JCA model or JCAL(Johnson-Champoux-Allard-Lafarge) model have less error ratio to the test values; the JCA model is applicable to the inversion of the acoustic parameters of glass wool materials, and the sensitivity of the airflow resistivity and tortuosity in the model is high, so the inversion process must be accurate.