Abstract
An approximation method for estimating the modal loss factors of a coupled structural-acoustical problem is proposed using the finite element method. This method provides a practical approach in terms of computational time and memory consumption. To validate our approach, we consider a coupled system in which the acoustical region is enclosed by a structural region, and both structural and acoustical regions are composed of various materials with individual damping characteristics. To obtain the modal loss factors, the modal strain and kinetic energy (MSKE) method is extended to the coupled problem by utilizing the sound pressure as a nodal unknown variable in the acoustical region. An air-filled PVC box was used as the test specimen. The measured and calculated frequency responses of the normalized sound pressure showed good agreement, verifying the reliability of the proposed method. Various damping parameters were tested for the sound-absorbing material inside the box to investigate the scope of the application of the proposed method. The discrepancy between the reference value and the proposed method is small considering fiberglass as a standard sound-absorbing material used in buildings. The proposed method also showed better management characteristics in terms of memory consumption and computational time.
Published Version
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