221 エンベロープインテンシティによる過渡音の評価(オーガナイズドセッション : O.S.2 音響・振動による診断技術II)

概要

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In order to apply the idea of the conventional time-averaged sound intensity to transient sounds, the envelope intensity method was proposed. The envelope intensity represents the energy flow related to the envelope of the sound wave. It changes slower than the instantaneous intensity but still has the time-variant nature. In this paper, transient sounds produced by hitting a wooden board from behind is recorded by use of a three-dimensional intensity probe and the direction of the impact position is estimated. Another application example described here is to rattling and rubbing noises produced inside car cabins. Results show that the envelope intensity is useful for solving undesirable transient noise problems.
社団法人日本機械学会の論文
2001-06-05