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

By Voichita Bucur

Massive task within the acoustics of wooden has happened because the first variation of this booklet in 1995. an off-the-cuff survey of the various released articles and papers provided at overseas meetings printed that the curiosity of the wooden technology group is constantly expanding. during this context, I felt c- pelled to revise the textual content in response to more moderen findings and this caused the addition within the current publication of 159 new references extra to the present 850 within the first variation. because of the favorable reviews upon the 1st variation, from scholars and associates, i've got integrated an element on mathematical conception regarding wave seasoned- gation in orthotropic solids within the normal textual content, so as to allow the reader to stick to the basically actual elements of the topic. a brand new bankruptcy concerning “acousto-ultrasonics” is brought; Chapters four, five, 6, eight, nine, 10, eleven, and 12 were significantly extended and an important redistribution of the subject material from the sooner version has been made.

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Tomography, fluoroscopy, and X-ray spectroscopy, have been developed and constantly refined to meet specific problems (Gustafsson and Simak 1956; Vozzo and Linebauch 1974; Paci and Perulli 1983). It has been proved that the X-ray technique is useful in the evaluation of seed maturity and quality, moisture content, seed ripeness, diagnosis of old and dead seeds, physiological changes, insect infestation, and mechanical damage. The interpretation of data using this technique relies on an adequate understanding of the limitations involved.

2 Anisotropic Solids The origin of anisotropy, perceived as the variation in material response with direction of the applied stress, lies in the preferred organization of the internal structure of the material. , the orientation of fibers in composites and human tissue, or the orientation of layers in laminated plastics, plywood, etc. One instance of complex elastic symmetry is that of an orthotropic solid, because constants are influenced by three mutually perpendicular planes of elastic symmetry.

It is generally admitted in architectural acoustics that heavier materials provide better sound isolation and, as an example, by doubling the surface weight, the sound loss increases by a factor of about 5. In addition to the weight, other factors affect wall vibration, for example some natural frequencies produced by bending waves and related to the stiffness of the construction. Sound-absorbing materials control echoes and reverberation. As an example of transmission loss, we cite the measurements on a wood panel 2 cm thick and on a panel of glass fibers of the same thickness (Braune 1960).

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