Sound Transmission through Double Panels Using Statistical Energy Analysis

Statistical energy analysis is used to study the transmission of random-incidence sound waves through two independent panels separated by an air space. The analytical model consists of five linearly coupled oscillators arranged, room-panel-cavity-panel-room. Both nonresonant and resonant transmission for the panels are included. The cavity is considered to behave as a resonant system and its modal density and loss factor are determined, analytically. Absorption material is placed around the edges of the cavity. The sound energy transmitted is found to be strongly dependent upon the radiation resistance of the panels, the panel spacing, and the panel and cavity loss factors. Agreement between the theoretical results and experiments for several different double panel systems is found to be good.