Study of Sound Isolation Panel with Ventilation Holes. 2nd Report. Effective Design Considering Coupling Sound Fields.

Abstract

The working principle and characteristics of a new sound isolation panel, containing ventilation holes, was described in the first report. The panel provides a considerable sound isolation effect in the required frequency band by controlling the acoustic anti-resonance frequency of the sound field inside the panel. However, when the panel is used close to a sound source, a standing wave is generated between it and the sound source. As a result, the sound isolation effect changes due to the coupling of the sound fields inside and outside the panel. This paper describes a way to locate the panel taking this phenomenon into account.