By Voichita Bucur
I've got chanced on this a superb e-book for realizing a few points of wooden utilized in musical tool making. It confirms a number of the conclusions reached from useful adventure. I simply want there has been a bit extra that was once proper to tool making.
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Extra resources for Acoustics of Wood (Springer Series in Wood Science)
1 Influence of the Anatomic Structure of Wood on Sound Absorption The acoustic efficiency of walls constructed with wood depends on the method of installation and on the basic properties of the material. A deeper understanding of the very complex phenomena related to the sound insulation of walls needs to consider the sound absorption of different wood species. As cited by Kollmann 22 Wood and Wood-Based Materials in Architectural Acoustics Fig. 1. Absorption coefficient as a function of frequency for maple (Acer mono).
Reduction of 20−30% at low to mid-frequency was observed, probably produced by the mechanical impedance of the wall and by the energy dissipation properties of the constitutive materials. 1. Average sound absorption coefficients of various building materials. 40 It is useful to underline that for the acoustical insulation of walls the relevant constants are: the surface mass or the mass density, the critical frequency, and the damping factor. The critical frequency is defined as the frequency measured when the velocity of the bending wave in the wall is equal to the velocity of the oblique incident wave.
Let us consider first the case of an isotropic solid in which bulk waves are propagating. When the particle motion is along the propagation direction, we have a longitudinal wave. When the particle motion is perpendicular to the propagation direction, we have a shear wave or a transverse wave. In anisotropic materials both longitudinal and transverse waves can propagate either along the principal symmetry directions or out of them. 1 shows the case of an orthotropic solid. Surface waves can propagate in any direction on any isotropic or anisotropic substrate, and can be used for the characterization of elastically anisotropic solids having piezoelectric properties as well as the characterization of layered solids (Edmonds 1981).
Acoustics of Wood (Springer Series in Wood Science) by Voichita Bucur