A fundamental problem in structure acoustics is the prediction of the sound radiated by a flat, rectangular panel set in an infinite baffle under some form of excitation, usually stochastic. The problem has thus been studied in some detail. However, practical situations such as measurement setup of sound transmission can always provide finite baffle due to finite size of the room. There is yet controversial if this finite baffle will result in any influence on sound transmission. Moreover, many practical structures have a cylindrical geometry, and hereby it is of interest to see how curvature affects sound radiation. In this paper, three cases, viz. the flat and the curved panel in the wall of a half-infinite rectangular room, and the curved panel in the cylindrical wall, are investigated. Modal radiation resistance are calculated for three cases in comparison with that of infinite baffle. For the case of finite panel in the middle of finite size wall, if the ratio of wall area to panel is larger than 10:1, the discrepancies of modal radiation resistance from that of infinite baffle can be expected less than 2dB above 100Hz. But for the case of finite panel in cylindrical wall, the discrepancies can be potentially significant from the viewpoint of sound transmission.
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