人および椅子の吸音力について : 殘響室法による吸音率測定に関する実験的研究V

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So far, it has been said that the sound absorption of persons and theatre chairs measured in the reverberation chamber does not agree with the sound absorption measured in actual situations. This is also the same in the case of added absorption by caused audience taking their seats in theatre chairs. In this report, measurements of absorption of persons and theatre chairs, which are directly applicable to the actual use, are mentioned. Reverberation chamber used for this research is the chamber of our institute ( 513m^3, nonparallel walls). Following results are obtained: (1) It is possible to measure the absorption of heavily upholstered theatre chairs without regard to the number of chairs (from 5 to 20 seats), or to the arrangement of chairs. This absorption shows a good agreement with the absorption measured in actual theatres (Fig. 4). (2) As to the absorption of persons seated in chairs made by plywood (0. 02〜0. 03m-sabin per chair), it was shown that the absorption was affected by the arrangement of seats (Fig. 6). By making proper correction of these data, it was found that the absorption of person could be measured in the reverberation chamber. This absorption is in good agreement with absorption resulting in ordinary rooms. (3) By using above method, the absorption of Japanese persons was obtained (Fig. 7). At frequencies below 1000 cycles per second, the absorption varies considerably with different seasons. (4) Absorption added by seating audience in heavily upholstered theatre chairs was also measured by the same method. The effect of added absorption on the reverberation time of theatres seems to be negligible in the case of chairs used in this research.
社団法人日本音響学会の論文
1958-09-30

人および椅子の吸音力について : 殘響室法による吸音率測定に関する実験的研究V

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