1n a previous work , it was shown that attaching small weights tD a membrane impr 〔 } ves the sound insula し ion in a [ ew − frequency range , This mechanism can be apphed to a plate under the condition that the thickness o 『ヒ he plate is thin . This paper is concerned with the deve 皇 opment of a sound ・ insulation board using the steel plate with additional weights , and resuh of a preliminary examination fbr rhe confirmation of mechanism , sound −insulation examination in reverberation rooms , and an application to practical noise contro [ ar ζ shown , lt is then verified that this materiat is useful for noise contro ] in u low ・ frequency range .
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