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Acoustic quality of vene wood (Pterocarpus erinaceus Poir) for xyIophones instruments manufacture in Mali

Traoré B., Brancheriau L., Perré P., Stevanovic T., Diouf P.N.. 2010. Annals of Forest Science, 67 (815) : 7 p..

Vène wood (Pterocarpus erinaceus Poir.) is currently the favorite wood for manufacture of xylophone in Mali. A dynamic analysis method with free boundary conditions, known as BING, was used to determine the main acoustic properties: specific dynamic modulus (EL/?), damping coefficient or internal friction (tan ?), sound radiation coefficient (SRC) and peak response (PR). The aim was to investigate the acoustic properties of vène wood (1) along three radial locations (internal: IHW, median: MHW, external: EHW); (2) related to two geographic origins (Guinean and Soudanian areas); and (3) to investigate the effect of ring width (RW), basic density (Db) and extractive content (EC) on these properties. High correlations were shown between tan ? with EL/? and EC. tan? decrease with increasing EL/? or EC. No significant difference of SRC was found between the geographic areas and the radial locations. No correlation between RW and acoustic properties was observed. EL, EL/? and PR were significantly higher for wood from the Guinean area than from the Soudanian area and also higher for EHW and MHW than for IHW. tan? follows inverse trends. These results could explain why the Malian xylophone makers empirically use only the wood from EHW and MHW. (Résumé d'auteur)

Mots-clés : propriété acoustique; son (acoustique); bois; pterocarpus erinaceus; mali

Thématique : Technologie des produits forestiers

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