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Extended theory of the absorption of sound by compressible wall-coverings

โœ Scribed by C.W. Kosten; C. Zwikker

Publisher
Elsevier Science
Year
1941
Weight
450 KB
Volume
8
Category
Article
ISSN
0031-8914

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โœฆ Synopsis

The theory, already previously communicated, of the absorption of sound by porous compressible wall-coverings is here extended to the case that the resistance of the air in the skeleton is of such a nature that the air can neither be considered as entirely free, nor as entirely unfree. The four simbl{-~neous differential equations furnish two different complex constants of propagation, leading for a layer of finite thickness to two series of characteristic frequencies. The solution is given for the cases : a. compressible layer with (normal) porous surface, b. compressible layer provided with a non-porous coating-film.

The results~are elucidated by two numerical examples and are compared with results from measurements previously published.

๐Ÿ“œ SIMILAR VOLUMES

Theory of the absorption of sound by com
Theory of the absorption of sound by compressible walls with a non-porous surface-layer
โœ C.W. Kosten; C. Zwikker ๐Ÿ“‚ Article ๐Ÿ“… 1941 ๐Ÿ› Elsevier Science โš– 870 KB

Sound absorbing materials with a non-porous surface-layer possess great advantages over the usuall well-known porous materials. These advantages are related mostly to their hygienic and decorative qualities. This kind of material, therefore, is already used in practice, the physical basis of the ab