拡散音場内に置かれた帯状板の周りの音場

概要

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The acoustic field around an elliptic cylinder located in the diffuse sound field is investigated. Especially the expected mean square values of sound pressure near a rigid strip, which is a special type of elliptic cylinders, are calculated in detail. The results show that the increase of SPL on the surface of a strip approaches to 3dB for sufficiently high frequencies. SPL along the central normal of the strip converges with oscillation to that original incident field as the observation point moves away from the strip. In the field more than one breadth of the strip apart from it, even in the direction of the normal, the scattering effect by the strip seems to be negligibly small. In order to verify theses theoretical results SPLs around a strip are measured in the reverberation chamber. The experimental values are in good agreement with the predicted ones. Moreover the results for a strip as above are compared with those for a disc the diameter of which is equal to the breadth of the strip.
社団法人日本音響学会の論文
1980-12-01