Download e-book for iPad: Acoustics of Wood by Voichita Bucur

By Voichita Bucur

ISBN-10: 3540261230

ISBN-13: 9783540261230

ISBN-10: 3540305947

ISBN-13: 9783540305941

From the studies 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, accumulating, organizing, and reviewing the disparate literature on such a lot facets of the Acoustics of Wood."

Journal of the Acoustical Society of the US, USA

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Example text

26) The relationships between two Poisson’s ratios, corresponding to a well-defined symmetry plane, are deduced from Eq. 27) From these equation we recognize that the corresponding in-plane Poisson’s ratios νrq and νqr could both have the same sign (+) or (−). 28) However, for anisotropic solids it is possible to have Er>Eq and therefore νqr>1. 1A. Engineering parameters of solid wood: Young’s moduli and shear moduli. 1B. Engineering parameters of solid wood: Poisson’s ratios. 31 Indeed, negative values of Poisson’s ratios or values greater than 1 may contradict our intuition if our main experience is dealing with isotropic solids, but such data have been reported for composite materials (Jones 1975) and for foam material (Lipsett and Beltzer 1988), cellular materials (Gibson and Ashby 1988), crystals, wood (McIntyre and Woodhouse 1986), and wood-based composites (Bucur and Kazemi-Najafi 2002).

As an example let us take the case of spruce in longitudinal direction, for which C11=150×108 N/m2=15,000 MPa=15 GPa. For solids of different symmetries such as isotropic, transverse isotropic, or orthotropic, the stiffness matrix can be turned into a compliance matrix, following a specific procedure (Bodig and Jayne 1982). , orientation of the fibers. 1 Elastic Symmetry of Propagation Media Because this chapter aims to provide the theoretical basis needed to understand wave propagation phenomena in solids, it was decided to analyze, first, the elastic symmetry of media of various complexity.

Takahashi et al. (1981, 1987a,b) reported results on the control of sounds travelling from one room to another through the floor−ceiling pathway. 4 shows the most common impact noise sources in a wooden house (child running and jumping, adult walking) together with the dropping of a tire and the corresponding measuring systems. ) proposed the utilization of a tapping machine and the dropping of a tire. Takahashi et al. (1987b) noted that there are similarities between the profile of frequency spectra for the floor-impact noise produced by the tapping machine and by the high-heeled shoes of a female walking and, on the other hand, by the noise produced by the tire drop and by barefoot male walking.

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Acoustics of Wood by Voichita Bucur

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