Abstract
A method of independent adjustment of acoustic resistance and acoustic reactance is proposed for the problem of coupling of acoustic resistance and acoustic resistance affecting impedance matching in sound resonant absorbers. Combining theoretical analysis model and finite element simulation model, the modulation mechanism of independent adjustment impedance is revealed. Theoretical and simulation results show that for the same structural thickness and perforation rate, the acoustic resistance of the perforated panel resonator with tube bundles (PPTB) varies with the inner diameter of the tube, but the acoustic resistance remains constant. The PPTB can exhibit different damping states at the same resonant frequency and show different sound absorption performances. The experiment verifies that independent adjustment impedance can improve the impedance matching effect and enhance the sound absorption performance. In addition, the influence of structural parameters on the sound impedance is discussed. Moreover, independent adjustment impedance can be expected to design low-frequency broadband sound absorption structures and optimize sound absorption bandwidth.
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