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- W2091911030 abstract "A normal mode analysis of the sound power injection in rectangular reverberation rooms has been carried out. It has been restricted to a pure tone, high impedance point source, typical laboratory chambers and the 125 Hz 1/3-octave band frequency interval. The main goal has been to identify results and guidelines that can be theoretically deduced and that should be of significance in actual sound power measurement situations. Some fundamental implications of the normal-mode theory are pointed out. The conclusion is that it should be somewhat more accurate to estimate the sound power by means of mean square pressure measurements made near the room surfaces than to measure within a restricted interior space of the room. The problematical power dependency on the chamber dimensions, the source position and the source frequency has been numerically analysed to obtain a quantitative description of the various sources of error associated with the reverberation room method. By restricting the placing of the source, i.e., the source was not allowed to be near any of the room boundaries, some important advantages were observed. It was shown that the expected value of the sound power was approximately equal to the free field output of the source, and that the source position variance was significantly reduced. Some tentative methods of improving the measurement accuracy are presented. They are based on the idea of attaining an averaging of the irregular sound power frequency response by means of discretely changing room conditions such as the room geometry and/or the air temperature. The methods have been numerically evaluated to obtain guidelines for their application, and a comparison with more common methods has been made. Some practical and acoustical advantages with the discrete methods are also mentioned." @default.
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- W2091911030 date "1977-12-01" @default.
- W2091911030 modified "2023-09-23" @default.
- W2091911030 title "A normal mode analysis of the sound power injection in reverberation chambers at low frequencies and the effects of some response averaging methods" @default.
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- W2091911030 doi "https://doi.org/10.1016/s0022-460x(77)81180-2" @default.
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