Sound quality assessment of wood for xylophone bars

Aramaki, Mitsuko; Baillères, Henri; Brancheriau, Loïc; Kronland‐Martinet, Richard; Ystad, Sølvi

doi:10.1121/1.2697154

Cited by 51 publications

(32 citation statements)

References 21 publications

(14 reference statements)

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“…The inharmonicity factor, proposed by Aramaki et al (2007), was computed. It represented the ratios between the second, third, and fourth Eigen frequencies divided by the first Eigen frequency.…”

Section: Fig 1 Illustration Of Vibrational Measurementsmentioning

confidence: 99%

Prediction of Oak Wood Mechanical Properties Based on the Statistical Exploitation of Vibrational Response

Faydi¹,

Brancheriau²,

Pot³

et al. 2017

BioResources

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aIn the European Union, timber is used in structural applications and must be graded with a Conformité Européene (CE) mark. To achieve standard, machine strength grading is used. A common technology for these machines is based on using the vibrational response of each wood board to estimate the timber modulus of elasticity and modulus of rupture. The first Eigen frequency is usually used to predict these mechanical properties. However, in heterogeneous wood species such as oak, this parameter is less correlated with mechanical properties. The current study proposes two new methods based on an extended exploitation of the vibrational response that predicts oak wood mechanical properties. The first method was based on the mechanical parameters deduced from several Eigen frequencies that were chosen with regards to a stepwise regression. The second method was based on the full vibrational spectrum and used a partial least squares method. The first method slightly improved the prediction of the modulus of elasticity compared with the first Eigen frequency in edgewise transversal vibration. Both methods significantly improved the prediction of the modulus of rupture.

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Section: Fig 1 Illustration Of Vibrational Measurementsmentioning

confidence: 99%

Prediction of Oak Wood Mechanical Properties Based on the Statistical Exploitation of Vibrational Response

Faydi¹,

Brancheriau²,

Pot³

et al. 2017

BioResources

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“…From an acoustical point of view, previous analyses on impact sounds have revealed two important physical aspects vis a vis the ear, i.e., the damping law, which characterizes the behavior of matter, and the distribution and number of frequency components that are most typical, given the geometric form of the source (Wildes and Richards, 1988;Lutfi and Oh, 1997;Klatzky and Pai, 2000;Aramaki and Kronland-Martinet, 2006;Aramaki et al, 2007). The spectral distribution of energy depends upon the stimulation.…”

Section: Introductionmentioning

confidence: 98%

From acoustic descriptors to evoked quality of car door sounds

Bezat¹,

Kronland‐Martinet²,

Roussarie³

et al. 2014

The Journal of the Acoustical Society of America

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This article describes the first part of a study aiming at adapting the mechanical car door construction to the drivers' expectancies in terms of perceived quality of cars deduced from car door sounds. A perceptual cartography of car door sounds is obtained from various listening tests aiming at revealing both ecological and analytical properties linked to evoked car quality. In the first test naive listeners performed absolute evaluations of five ecological properties (i.e., solidity, quality, weight, closure energy, and success of closure). Then experts in the area of automobile doors categorized the sounds according to organic constituents (lock, joints, door panel), in particular whether or not the lock mechanism could be perceived. Further, a sensory panel of naive listeners identified sensory descriptors such as classical descriptors or onomatopoeia that characterize the sounds, hereby providing an analytic description of the sounds. Finally, acoustic descriptors were calculated after decomposition of the signal into a lock and a closure component by the Empirical Mode Decomposition (EMD) method. A statistical relationship between the acoustic descriptors and the perceptual evaluations of the car door sounds could then be obtained through linear regression analysis.

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“…This medium-heavy (specific gravity 0.6-0.9) wood is favoured for xylophone making, both in modern western manufacture and in African traditions, as for the slit-drums that were used for long-distance transmission of messages. As very low damping should be of prime importance for xylophones woods (Aramaki et al 2007), such predominant uses strongly suggest that this species might have peculiar vibrational properties.…”

Section: Introductionmentioning

confidence: 99%

Effect of extractives on vibrational properties of African Padauk (Pterocarpus soyauxii Taub.)

et al. 2010

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Extractives can affect vibrational properties tan1 (damping coefficient) and E'/2 (specific Young's modulus) but this is highly dependent on species, compounds, and cellular locations. This paper investigates such effects for African Padauk (Pterocarpus soyauxii Taub.), a tropical hardwood with high extractives content and a preferred material for xylophones. 5 groups of 26 heartwood specimens with large, yet comparable, ranges in vibrational properties were extracted in different solvents. Changes in vibrational properties were set against yields of extracts and evaluation of their cellular location. Methanol (ME) reached most of compounds (13%), located about half in lumen and half in cell-wall. Water solubility was extremely low. tan1 and E'/2 were very strongly related (R 2 30.93), but native wood had abnormally low values of tan1, while extraction shifted this relation towards higher tan1 values. ME extracted heartwood became in agreement with the average of many species, and close to sapwood. Extractions increased tan1 as much as 60%, irrespective of minute moisture changes or of initial properties. Apparent E'/2 was barely changed (+2% to -4%) but, after correcting the mass contribution of extracts, was in fact slightly reduced (down to -10% for high E'/2), and increasingly so for specimens with low initial values of E'/2.

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Sound quality assessment of wood for xylophone bars

Cited by 51 publications

References 21 publications

Prediction of Oak Wood Mechanical Properties Based on the Statistical Exploitation of Vibrational Response

Prediction of Oak Wood Mechanical Properties Based on the Statistical Exploitation of Vibrational Response

From acoustic descriptors to evoked quality of car door sounds

Effect of extractives on vibrational properties of African Padauk (Pterocarpus soyauxii Taub.)

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