Effect of sound-induced vibration on the sound absorption properties of three-leaf microperforated panel absorbers

In order to study the effect of sound-induced vibration on the sound absorption properties of three-leaf microperforated panel absorbers, sound absorption properties of three-leaf microperforated panel absorbers are computed based on the microperforated panel theory and electro-acoustical equivalent circuit principle. Results show that the low-frequency sound absorption properties of three-leaf microperforated panel absorbers decrease and high-frequency sound absorption properties of three-leaf microperforated panel absorbers change little considering sound-induced vibration. And the sound absorption performance curves of three-leaf microperforated panel absorbers considering sound-induced vibration are gradually closed to the condition without considering sound-induced vibration with the increasing of the mass density. Two resonance peaks moves toward low frequency region with the increasing of the pore diameter and distance of microperforated panel and moves toward high frequency region with the increasing of the perforation when other parameters keep invariant. In conclusion, the sound absorption performance of three-leaf microperforated panel absorbers was affected by sound-induced vibration and the variation degree of sound absorption performance depends on the mass density and structure parameters of microperforated panel.