Download Acoustics of Wood by Voichita Bucur PDF

By Voichita Bucur

From the reports of the first edition:

"It would definitely stay the main accomplished paintings during this box for a very long time to return. It belongs at the bookshelf of each fabric scientist and structural engineer."

CAS magazine, USA

"...[T]he writer has performed an admirable task, gathering, organizing, and reviewing the disparate literature on so much elements of the Acoustics of Wood."

Journal of the Acoustical Society of the USA, USA

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Extra resources for Acoustics of Wood

Example text

In engineering practice, however, the elastic constants of solid wood could be used for accurate estimation of the elastic properties of plywood. Gerhards (1987) defined a homogeneous “equivalent orthotropic material” that enables conventional analysis methods to be applied for elastic characterization of plywood. Gerhard's approach is deduced from the “strain energy” method. The properties of the proposed material are compared with those of an equivalent material deduced from the “law of mixtures” proposed previously by Bodig and Jayne (1982).

2) or where [Cijkl] are termed elastic stiffnesses and [Sijkl] the elastic compliances, and i, j, k, or l correspond to 1, 2, 3, or 4. Stiffnesses and compliances are fourth-rank tensors. ” This is the notation that will be used hereafter. [Cijkl] could be written, following the general convention on matrix notation, as [Cij], in terms of two-suffix stiffnesses, or symbolically as [C]. Similarly, [Sijkl] could be written as [Sij] or [S]. In many applications it is much simpler to write Eqs. 2’’) It is apparent that the stiffness matrix [C] is the inverse of the compliance matrix [S], as [C]=[S]−1 and [S]=[C]−1.

Similar statements have been advanced by all acousticians involved in architectural acoustics (Beranek 1960, 1962; Egan 1988). Sound absorption and sound reflection efficiency over the audible spectrum are strongly related to the internal structure of the material, surface treatment, type of mounting, geometry, etc. For example, plywood and particleboard provide sound absorption in the lower-frequency region of the audible spectrum (<500 Hz) and porous artificial materials are remarkably efficient absorbents at mid and high frequencies (2,000−4,000 Hz), as cited by Beranek (1960).

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