Design and acoustical performance investigation of sound absorption structure based on plastic micro-capillary films

Abstract

Based on its constituting parallel micro-capillaries, the sound absorption behavior of multi-layer plastic micro-capillary film (MCF) structure has been investigated. The effects of micro-capillary diameter, perforation rate and perforation diameter on the sound absorption performance of the multi-layer MCF structures were studied using the standing wave tube method. It was demonstrated that the multi-layer MCFs had good sound absorption especially at low frequencies around the resonant frequency. The mechanical property of the MCF samples was measured by a strength tester and results demonstrated this sound absorption structures had stable mechanical behavior. Compared to two traditional sound absorption materials (perforated panel and porous material), the sound absorption coefficients of the MCF samples are comparable and competitive to them. Therefore the novel multi-layer MCFs, which are easy-to-manufacture and cost-effective, have promising applications in the field of sound absorption.