Effect of plastocene embedment in the microperforated plate on its acoustic performance

Abstract

Noise pollution is one of the contemporary environmental pollution, which seriously damages people’s green and healthy life. In order to further improve the low frequency sound absorption performance of microperforated panel (MPP), a new plastocene coupled microperforated plate (PCMPP) is proposed. The acoustic properties of PCMPP with different apertures and perforation ratio were measured by transfer function method and compared with that of conventional MPPs. It is found that when the aperture was 0.8 mm, the peak value of sound absorption coefficient of PCMPP decreased by 150 Hz compared with MPP. In a certain range, PCMPP with lar-ger apertures showed a greater influence on sound absorption property in low frequency. In addition, higher perforation ratio led to a greater PCMPP bandwidth of sound absorption. On the other hand, the effect of PCMPP with aperture of 0.2 mm on the performance of MPP was reduced, which could be compensated by increasing the perforation ratio. Furthermore, we found that the effect of aperture, perforation ratio and cavity on the sound absorption performance of PCMPP was consistent with that of ideal rigid MPP. The step cooling curve showed that the plastocene began to soften at about 50°C, representing a great potential for a non-high temperature work environment.