By Jean Allard, Noureddine Atalla
"The first version of this ebook is taken into account the bible of this topic... Suffice it to claim that there's no different released treatise that ways the intensity of remedy provided via this ebook. The assurance is the nation of the printed paintings, whereas the extra contents disguise the hot recognized advancements within the field." Haisam Osman; expertise improvement supervisor, United release Alliance
This long-awaited moment version of a revered textual content from international leaders within the box of acoustic fabrics covers the cutting-edge with a intensity of therapy unrivalled in other places. Allard and Atalla hire a logical and revolutionary procedure that ends up in a radical figuring out of porous fabric modelling.
The first variation of Propagation of Sound in Porous Media brought the elemental concept of acoustics and the similar strategies. learn and improvement in sound absorption has even if stepped forward considerably because the first variation, and the versions and strategies defined, on the time hugely technical and really expert, have when you consider that develop into major circulation. during this moment variation, numerous unique subject matters were revisited and sensible prediction tools and commercial purposes were further that raise the breadth of its entice either teachers and training engineers.
New chapters have additionally been extra on numerical modeling in either low (finite point) and excessive frequency (Transfer Matrix Method).
Collating ‘must-have’ details for engineers operating in sound and vibration, Propagation of Sound in Porous Media, 2nd version deals an undeniable connection with a various viewers; together with graduate scholars and lecturers in mechanical & civil engineering, acoustics and noise keep watch over, in addition to training mechanical, chemical and fabrics engineers within the automobile, rail, aerospace, construction and civil industries.
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Extra info for Propagation of Sound in Porous Media: Modelling Sound Absorbing Materials 2e
5. Let k, k and k be the wave numbers in ﬂuids 1, 2 and 3, respectively. The angle of incidence is θ . 5 Three layers of ﬂuid backed by an impedance plane reﬂected waves are represented in ﬂuid 3. 36), d being replaced by d1 . In the same way, Z(M4 ) and Z(M6 ) can be calculated successively. This approach can be used for any number of layers. 5 Reﬂection coefﬁcient and absorption coefﬁcient at oblique incidence The reﬂection coefﬁcient at the surface of a layer is the ratio of the pressures p and p created by the outgoing and the incoming wave, as in the case of normal incidence.
1987, Tarnow 2005) because generally most of the ﬁbres lie in planes parallel to the surface. 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.
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.
Propagation of Sound in Porous Media: Modelling Sound Absorbing Materials 2e by Jean Allard, Noureddine Atalla