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Measurement of the Rigidity Coefficients of a Melamine Foam

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For an isotropic elastic solid, all the rigidity coefficients can be evaluated from the velocities of the shear wave and of the compressional wave. For an isotropic porous frame, the rigidity coefficients of the frame in vacuum can be evaluated from the velocities of the frame compressional Biot wave and the shear Biot wave when the porous frame is saturated by air. The velocity of the frame compressional Biot wave is evaluated at audible frequencies from the detection of the quarter compressional wavelength resonance generated with a point source in air for samples bonded on a rigid impervious backing. In a previous work, the second measured parameter was the velocity of the shear wave evaluated from the quarter shear wave resonance. In this work, the second parameter is the velocity of the Rayleigh waves slightly modified by the finite thickness of the samples, the observation of the shear resonances being difficult for the melamine foam.
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Document Type: Research Article

Publication date: September 1, 2007

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  • Acta Acustica united with Acustica, published together with the European Acoustics Association (EAA), is an international, peer-reviewed journal on acoustics. It publishes original articles on all subjects in the field of acoustics, such as general linear acoustics, nonlinear acoustics, macrosonics, flow acoustics, atmospheric sound, underwater sound, ultrasonics, physical acoustics, structural acoustics, noise control, active control, environmental noise, building acoustics, room acoustics, acoustic materials, acoustic signal processing, computational and numerical acoustics, hearing, audiology and psychoacoustics, speech, musical acoustics, electroacoustics, auditory quality of systems. It reports on original scientific research in acoustics and on engineering applications. The journal considers scientific papers, technical and applied papers, book reviews, short communications, doctoral thesis abstracts, etc. In irregular intervals also special issues and review articles are published.
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