The acoustic-electrical analogy method is used to analyze the sound absorption characteristics of a curved micro-perforated panel (CMPP), and the free vibration characteristics of the curved panel are solved by the Rayleigh integral method. Based on the principle of coupled vibro- acoustic, the sound absorption characteristics of the micro-perforated panel considering panel vibration are obtained. The effects of structural parameters such as perforation rate, aperture, panel thickness, radius of curvature, depth of back cavity, and panel aspect ratio on the sound absorption coefficient of CMPP are analyzed. According to the theoretical model, the impedance tube device is designed to measure the sound absorption coefficients of CMPP, which are measured under different perforation rates and apertures. Results obtained show that as the perforation rate and aperture increase, the absorption peak caused by micropores decreases and the sound absorption bandwidth becomes narrower. With the increase of the panel thickness and the sound absorption peak caused by the resonance of the panel moves to high frequency, while the sound absorption peak caused by micropores moves to low frequency, which proves the accuracy of the theoretical model.
Key words: curved micro-perforated panel; free vibration characteristics; coupled vibro-acoustic; sound absorption coefficient; impedance tube
Key words
curved micro-perforated panel /
free vibration characteristics /
coupled vibro-acoustic /
sound absorption coefficient /
impedance tube
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