Including the influence of finite cavities in sound insulation of double-plate structures

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Abstract

Lightweight walls are often designed as frameworks of studs with plates on each side -- a double-plate structure. The studs constitute boundaries for the cavities, thereby both affecting the sound transmission directly by short-circuiting the plates, and indirectly by disturbing the sound field between the plates. The paper presents a deterministic prediction model for airborne sound insulation including both effects of the studs. A spatial transform technique is used, taking advantage of the periodicity. The acoustic field inside the cavities is expanded by means of cosine-series. The transmission coefficient (angle-dependent and diffuse) and transmission loss are studied. Numerical examples are presented and comparisons with measurement are performed. The result indicates that a reasonably good agreement between theory and measurement can be achieved.
Original languageEnglish
JournalAcoustical Society of America. Journal
Volume117
Pages (from-to)3727-3739
ISSN0001-4966
Publication statusPublished - 2005
Externally publishedYes

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