Sound transmission loss of multi-layered elastic micro-perforated . . . In this paper, the sound transmission loss (STL) of multi-layered elastic micro-perforated plates (MPPs) in an impedance tube is investigated using the transfer matrix method under the plane wave condition The number of MPPs can be arbitrary, and each MPP may or may not have a perforation
Sound transmission through a microperforated-panel structure with . . . Although MPP structures generally have great potential for sound absorption, an improvement in the transmission loss at midfrequencies, which is important for architectural sound insulation, is not sufficient when using a backing cavity alone
Sound insulation characteristics of multi-layer structures with a . . . Herein the sound transmission loss of multi-layer structures with flexible MPPs of infinite extent is theoretically investigated The calculation is based on the wave equation and the equation of panel vibration including the effect of perforation of the panel
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Sound insulation characteristics of multi-layer structures with a . . . Herein the sound transmission loss of multi-layer structures with flexible MPPs of infinite extent is theoretically investigated The calculation is based on the wave equation and the equation of panel vibration including the effect of perforation of the panel