Effects of an air-layer-subdivision technique on the sound transmission through a single plate.
Many studies on the sound transmission through a single plate have been carried out theoretically and experimentally. The transmission-loss characteristics, in general, follow mass law. Therefore, increasing mass of a plate is a fundamental measure to improve the insulation performance. This method, however, has limitations and might not be a reasonable alternative in current standards. Furthermore, the transmission loss at the critical frequency of coincidence is deteriorated significantly even if the mass is rather large. In this paper, the effect of the air-layer-subdivision technique is studied in detail from the viewpoint of the sound transmission problem of a single plate. An analytical model of an infinite single plate with a subdivided layer is considered and the improvement of the transmission loss is estimated. The limitations of the technique are clarified with some parametric studies. In order to validate the predictions, an experiment was carried out. The transmission loss of a glass board with the air layer subdivided by acryl partitions was measured in the experiment. They were in good agreement with the theoretical ones near and above the coincidence.
Toyoda
Masahiro
M
Kyoto University Pioneering Research Unit, B104, Kyoto University Katsura, Nishikyo-ku, Kyoto, 615-8530, Japan. masahiro.toyoda@kupru.iae.kyoto-u.ac.jp
Kugo
Hajime
H
Shimizu
Takafumi
T
Takahashi
Daiji
D