Wood: Vibration and Acoustic Properties

Roohnia, Mehran

doi:10.1016/b978-0-12-803581-8.01996-2

Cited by 5 publications

(7 citation statements)

References 29 publications

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“…The wood density ρ, elastic modulus E L , specific elastic modulus E L /ρ, stiffness modulus G LR , and logarithmic decrement δ L are directly related to the acoustic properties of wood (Roohnia 2019;Buksnowitz et al 2007). The parameters of the spruce wood are given in Table 1.…”

Section: Resultsmentioning

confidence: 99%

“…The initial mass was measured as M, and the density ρ was calculated. Based on Bernoulli-Euler beam transverse vibration, the natural frequency of the wood was tested using flexural vibration by a dual-channel fast Fourier transform (FFT) analyzer (CF-5220Z, Japan) (Kohantorabi et al 2017;Miao et al 2015), and the acoustic vibrational properties including the dynamic elastic modulus E L , specific dynamic elastic modulus E L /ρ, acoustic radiation R, logarithmic decrement δ L , stiffness modulus G LR , acoustic impedance Z, E L /G LR , propagation velocity of bending vibration υ, sound transmission parameter υ/σ, and acoustic conversion efficiency υ/(δ L• ρ) were calculated (Wegst 2006;Roohnia 2019;Miao et al 2015). The E L and δ L were calculated by Eqs.…”

Section: Acoustic Vibrational Propertiesmentioning

confidence: 99%

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Effect of extraction on the acoustic vibrational properties of Picea jezoensis var. microsperma (Lindl.) W.C.Cheng & L.K.Fu

Miao

Qian

et al. 2021

Annals of Forest Science

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Key message The specific dynamic elastic modulus, acoustic radiation, logarithmic decrement, sound transmission parameter, and acoustic conversion efficiency of spruce wood (Picea jezoensis var. microsperma (Lindl.) W.C.Cheng & L.K.Fu) were improved by extraction treatment with deionized water, dichloromethane, benzyl alcohol, and ethanol. A larger improvement was achieved after extraction with benzoyl alcohol and dichloromethane extraction than by using ethanol and deionized water.• Context It is necessary to improve the acoustic vibrational properties of wood to solve the problem of resource shortage of wood with excellent acoustic vibrational properties for the soundboards of musical instruments and to improve the use value of wood. • AimsThe effects of extraction treatment with deionized water, dichloromethane, benzyl alcohol, and ethanol on the acoustic vibrational properties of spruce wood were evaluated.• Methods After the acoustic vibrational properties of untreated wood samples were measured using the free-free flexural vibration test method with a fast Fourier transform spectrum analyzer (FFT, CF-5220Z), extraction treatment of the wood samples was separately performed with deionized water, dichloromethane, benzyl alcohol, and ethanol for 15 days at room temperature and pressure, followed by drying. The acoustic vibrational properties of the treated wood samples were then measured, and the effect of extraction treatment on the acoustic vibrational properties was analyzed. • ResultsThe increase in the specific dynamic elastic modulus was highest (14.5%) after the benzyl alcohol treatment. The acoustic radiation clearly improved after the ethanol treatment (18.1%). The acoustic impedance of the wood treated by dichloromethane extraction decreased significantly (−4.35%), while the logarithmic decrement was significantly reduced (−52.0%) by benzyl alcohol treatment. From the viewpoint of energy utilization, with benzyl alcohol treatment, the acoustic conversion efficiency and transmission parameter increased by 124% and 125%, respectively. • ConclusionThe degree of improvement in the acoustic vibrational properties of wood differed depending on the solvent used. Greater improvement was observed after extraction with benzoyl alcohol and dichloromethane as compared to ethanol and deionized water.

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Section: Resultsmentioning

confidence: 99%

Section: Acoustic Vibrational Propertiesmentioning

confidence: 99%

Effect of extraction on the acoustic vibrational properties of Picea jezoensis var. microsperma (Lindl.) W.C.Cheng & L.K.Fu

Miao

Qian

et al. 2021

Annals of Forest Science

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“…The dynamic elastic modulus ( E / ρ ), acoustic radiation damping coefficient ( R ) and acoustic impedance ( ω ) were calculated. The equation used to calculate the dynamic elastic modulus was as follows [ 26 ], where L is the board length, f is the resonance frequency, β n is the relative constant of wood boundary conditions and h is the board thickness

…”

Section: Methodsmentioning

confidence: 99%

Section: Acoustic Propertiesmentioning

confidence: 99%

Moisture- and mould-proof characteristics of surface modified wood for musical instrument soundboards

Liu

et al. 2022

R. Soc. open sci.

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Wood is the main material used for musical instrument soundboard fabrication, for practical and cultural reasons. As a natural material, however, wood is easily degraded due to moisture or fungal corrosion. Most traditional wood protection methods were devised for structural materials, and may thus not be suitable for application in musical instrument soundboard materials. In the current study, a novel nanomaterial-based modification method was applied to wood. The surface of wood was coated with polyurethane and MgAl-layered double hydroxide nanosheets after a convenient impregnation process. The modified wood exhibited improved hydrophobicity and mould-resistance, while maintaining its acoustic properties. This modified wood may facilitate the construction of soundboards with longer lifespans.

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“…where λ is the logarithmic decrement, and tan corresponds to the damping of vibration. The acoustical coefficient (K) and acoustical conversion efficiency (ACE), based on modulus of elasticity, density, and damping factor, are applied in the musical instrument industry as criteria for selecting the proper wood (Ono and Norimoto 1983;Tsoumis 1991;Roohnia 2019). These parameters are calculated through Eqs.…”

Section: Methodsmentioning

confidence: 99%

Effect of artificial inhomogeneity of density and drilling on dynamic properties developed by poplar block species (Populus nigra) jointed with oak wood (Quercus castaneifolia) beams

Kohantorabi

Hemmasi

Talaeipour

et al. 2020

BioRes

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Inhomogeneities in wood and wood products are evident. Sometimes these inhomogeneities are combined with other inhomogeneities such as drilling. Each can have different effects on dynamic properties, and these footprints can cause hidden defects in wood and wood products. In this research, the effects of artificial inhomogeneity of density and drilling diameters (1 mm, 3 mm, 5 mm, and 10 mm) on dynamic properties of the beams produced from oak wood jointed with poplar blocks (one at the end and the other at the central part of the beam) were investigated. Free vibration on a free-free beam test was subjected for the evaluations. The results indicated that factors such as dynamic modulus of elasticity, acoustic coefficients, and damping capacity, were affected by both inhomogeneity and drillings. The acoustical converting efficiency showed the exact location of inhomogeneity. It also showed the level of drilling diameter.

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Wood: Vibration and Acoustic Properties

Cited by 5 publications

References 29 publications

Effect of extraction on the acoustic vibrational properties of Picea jezoensis var. microsperma (Lindl.) W.C.Cheng & L.K.Fu

Effect of extraction on the acoustic vibrational properties of Picea jezoensis var. microsperma (Lindl.) W.C.Cheng & L.K.Fu

Moisture- and mould-proof characteristics of surface modified wood for musical instrument soundboards

Effect of artificial inhomogeneity of density and drilling on dynamic properties developed by poplar block species (Populus nigra) jointed with oak wood (Quercus castaneifolia) beams

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