Propagation of Sound in Porous Media: Modelling Sound by Jean Allard, Noureddine Atalla

By Jean Allard, Noureddine Atalla

"The first version of this booklet is taken into account the bible of this topic... Suffice it to assert that there's no different released treatise that methods the intensity of remedy provided via this e-book. The insurance is the nation of the broadcast artwork, whereas the further contents hide the hot identified advancements within the field." Haisam Osman; expertise improvement supervisor, United release Alliance

This long-awaited moment variation of a revered textual content from global leaders within the box of acoustic fabrics covers the state-of-the-art with a intensity of therapy unrivalled somewhere else. Allard and Atalla hire a logical and innovative method that ends up in an intensive figuring out of porous fabric modelling.

The first variation of Propagation of Sound in Porous Media brought the fundamental conception of acoustics and the similar concepts. examine and improvement in sound absorption has besides the fact that stepped forward considerably because the first version, and the types and techniques defined, on the time hugely technical and really good, have considering the fact that turn into major move. during this moment variation, a number of unique subject matters were revisited and sensible prediction equipment and business purposes were additional that raise the breadth of its attract either lecturers and practicing engineers.

New chapters have additionally been further on numerical modeling in either low (finite aspect) and excessive frequency (Transfer Matrix Method).

Collating ‘must-have’ details for engineers operating in sound and vibration, Propagation of Sound in Porous Media, 2nd variation deals an undeniable connection with a various viewers; together with graduate scholars and lecturers in mechanical & civil engineering, acoustics and noise regulate, in addition to practicing mechanical, chemical and fabrics engineers within the car, rail, aerospace, construction and civil industries.

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Extra info for Propagation of Sound in Porous Media: Modelling Sound Absorbing Materials 2e

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Miki, Y. (1990) Acoustical properties of porous materials – Modifications of Delany–Bazley models. J. Acoust. Soc. Japan, 11, 19–24. Morse, M. , and Ingard K. U. (1986) Theoretical Acoustics. Princeton University Press, Princeton. Nicolas, J. and Berry, J. L. (1984) Propagation du son et effet de sol. Revue d’Acoustique, 71, 191–200. Papoulis, A. (1984) Signal Analysis. McGraw-Hill, Singapore. Pierce, A. D. (1981) Acoustics: An Introduction to its Physical Principles and Applications. McGraw-Hill, New York.

10. 10 A panel of anisotropic fibrous material. The vectors υ and F indicate in the plane x2 = 0 the direction of the flow of air, and the force acting on the air due to viscosity, respectively. x3 = 0. Since the flow resistivity is larger in the normal direction than in the planar direction, the viscous force F acting on air flowing in the direction υ is generally not parallel to υ. The force F lies in a direction opposite to that of v only if v is parallel to a normal or a planar direction. The porous medium is supposed to be transversely isotropic.

Cremer, L. and Muller, A. (1982) Principles and Applications of Room Acoustics. Elsevier Applied Science Publishers, London. E. N. (1970) Acoustical properties of fibrous materials. Applied Acoustics, 3, 105–16. Nicolas, J. L. (1984) Propagation du son et effet de sol. Revue d’Acoustique, 71, 191–200. Tarnow, V. (2005) Dynamic measurement of the elastic constants of glass wool. J. Acoust. Soc. Amer. 118, 3672–3678. 1 Introduction The geometry of the pores in ordinary porous materials is not simple, and a direct calculation of the viscous and thermal interaction between the air and these materials is generally impossible to perform.

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