実験モード解析を用いた音響透過損失評価法の開発

概要

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New approach to estimate sound transmission loss of a wall in a low frequency range is developed. Conventional TL estimation needed the acoustic rooms which have enough large scale to realize diffuse sound field. The main advantage of the method proposed here is no need of these facilities. In executing this method, only hammering test data is used and these data is processed to extract modal parameters of the wall. Using these modal parameters and the supposed rain-drop force on the wall which simulates the reverberant sound field, dynamic response of the wall is calculated based on stochastic vibration analysis. The total power radiated from the wall is estimated and as a result, TL of the wall is achieved. This method is applied to the mockup test of simply-supported plate and the results showed very good agreement with the analytical results based on incident sound plane wave model. As a result, this method is proven to be effective and reliable tool to estimate sound transmission loss of sound insulation wall.