By Voichita Bucur
From the experiences of the first edition:
"It would definitely stay the main accomplished paintings during this box for a very long time to come back. It belongs at the bookshelf of each fabric scientist and structural engineer."
CAS magazine, USA
"...[T]he writer has performed an admirable task, accumulating, organizing, and reviewing the disparate literature on so much points of the Acoustics of Wood."
Journal of the Acoustical Society of the US, USA
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Extra info for Acoustics of Wood
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).
Another very important field of utilization of wood and wood-based composites as acoustical insulators is in the acoustics of concert halls, opera houses, lecture rooms, etc. The sound field in a room is very complicated and not open to precise mathematical determination. Two points are relevant to the fundamental aspects of room acoustics: the generation and propagation of the sound in an enclosure and the physiological and psychological factors that provide clues about good or poor acoustics.
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. 2 Wood Materials as Acoustical Insulators Wood was and still is a basic building material.