Acoustics of Wood by Voichita Bucur

By Voichita Bucur

From the experiences of the first edition:

"It would certainly stay the main complete 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, amassing, organizing, and reviewing the disparate literature on such a lot elements of the Acoustics of Wood."

Journal of the Acoustical Society of the USA, USA

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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.

5). ” This occurs when excitation is produced with a loud impulsive sound, generated by pistol shots or, better, with an omnidirectional dodecaeder loudspeaker system, giving pulses of 1 ms duration (Muller 1986). ISO 3382-1975(E) “Measurement of reverberation time in auditoria” allows the comparison of acoustical quality of different halls expressed by the reverberation time. 3 s for symphonic music. 6 shows the reverberation time versus frequency in several unoccupied famous halls (the Concertgebouw, Amsterdam; Symphony Hall, Boston; Metropolitan Opera House, New York; Teatro Alla Scala, Milan; Royal Opera House, London; Municipal Theatre of Lima, Lima).

The corresponding absorption at low frequencies is a welcome complement to the medium- and high-frequency absorption of the audience” (Cremer et al. 1983). 4 Summary Wood and wood-based composites are basic building materials and acoustic insulators used for floors, ceilings, and walls, for the reduction of indoor and outdoor noise. Indoor noise sources include automatic home appliances, such as heating, air conditioning, and sanitary systems, entertainment devices, musical instruments, conversations, floor-impact noise, the activity of adults and children, etc.

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