Download Acoustics of Wood (Springer Series in Wood Science) by Voichita Bucur PDF

By Voichita Bucur

ISBN-10: 3540305947

ISBN-13: 9783540305941

I've got came upon this an exceptional ebook for figuring out a few elements of wooden utilized in musical software making. It confirms a few of the conclusions reached from useful adventure. I simply want there has been a bit extra that was once correct to software making.

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Additional info for Acoustics of Wood (Springer Series in Wood Science)

Sample text

S44 S55 S66 relate a shear strain to a shear stress in the same plane,. and are the inverse of the terms C 44 C55 C66, corresponding to planes 23, 13, and 12. 16) The terms of the compliance matrix are similarly related to the terms of the stiffness matrix, with the terms S replaced by the terms C. 18’) Accurate measurement of the set of orthotropic constants is not an easy task. Among these constants, Poisson's ratios νij are perhaps the most difficult to measure. For a more thorough understanding of the problem, the realistic boundaries of Poisson’s ratios have also to be considered.

1967) noted that for all species analyzed, when thin specimens (10 mm maximum thickness) are exposed to the incident Wood Materials as Acoustical Insulators 23 Fig. 2. Transmission of sound through panels. Above Schematic representation of sound propagation between adjoining rooms. (Beranek 1962, with permission). Below Schematic representation of incident acoustic energy (Ee) on a wall and corresponding transmitted (Ed), absorbed (Ea), and reflected (Er) energies. (Braune 1960) sonic energy in the anisotropic planes of wood LR or longitudinal tangential (LT), the absorption coefficient is small and quite constant for all frequencies.

The corresponding stiffness matrix (Eq. 12) contains five independent constants (C11, C22, C55), four diagonal terms and two off-diagonal terms (C12, C13). It can be shown that the transverse isotropy is a particular case of an orthotropic solid. The terms of the independent elastic constants are given below for the solids exhibiting different elastic symmetry. 13) In summary, the number of constants for various types of anisotropic materials is 21 for monoclinic materials, 13 for triclinic materials, 9 for orthotropic materials, 5 for hexagonal or transversely isotropic materials, and 2 for isotropic materials.

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