Study of Sound Isolation Panel with Ventilation Holes : Principle and Transmission Loss

Abstract

There are many instances in which measures for reducing machinery noise must simultaneously satisfy conflicting requirements for sound isolation and ventilation. These two requirements are contradictory because effective noise isolation requires a structure with high material density per unit area and to be extremely airtight. A new sound isolation panel has been developed that resolves this contradiction. It provides sound isolation in the required frequency band by controlling the acoustic anti-resonance frequency of the sound field inside the panel, while incorporating holes for ventilation. The working principle and characteristics of this sound isolation panel are described with the help of simulation and experimental data.