Sound Transmission Loss of A Double-Leaf Partition with Micro-Perforated Plate Insertion under Diffuse Field Incidence

Abstract

In noise control applications, a double-leaf partition has been applied widely as a lightweight structure for noise insulation, such as in car doors, train bodies, and aircraft fuselages. Unfortunately, the insulation performance deteriorates significantly at massair-mass resonance due to coupling between the panels and the air in the gap. This paper investigates the effect of a micro-perforated panel (MPP), inserted in the conventional double-panel partition, on sound transmission loss at troublesome resonant frequencies. It is found that the transmission loss improves at this resonance if the MPP is located at a distance of less than half that of the air gap. A mathematical model is derived for the diffuse field incidence of acoustic loading.

Prediction of acoustic wave transmission features of the multilayered plate constructions: A review

“…Therefore, Putra et al. [410] modeled a structure based on the MPP to improve the acoustic characteristic at this bothersome resonance frequency considering diffuse field. Diffuse field incidence was also used by Natsuki et al.…”