Sound transmission across a rectangular duct section with a thin micro-perforated wall backed by a sidebranch cavity

An experimental investigation was carried out in the present study for deeper understanding on the sound transmission across a rectangular duct section installed with a thin micro-perforated panel (as a duct wall) backed by a sidebranch cavity. The contributions of the panel configuration and the cavity depth on reducing sound transmission are examined in detail. Results indicate a complicated relationship between sound power transmission, micro-perforation configuration and backing cavity depth. For panels with strong sound absorption capacity, sound power transmission efficiency is reduced as the panels become less absorptive, but there exists a frequency or frequency band above which the opposite is observed. It appears that there is also a certain level of panel sound absorption below which the sound transmission is strengthened over the whole frequency range of present study when the panel becomes less absorptive to sound