Acoustic quality of vène wood Pterocarpus erinaceus Poir. for xylophone instrument manufacture in MaliReport as inadecuate




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1 LERFoB - Laboratoire d-Etudes des Ressources Forêt-Bois

Abstract : 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-ρ, damping coefficient or internal friction tan δ, 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 tanδ with EL-ρ and EC. tanδ decrease with increasing EL-ρ 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-ρ 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. tanδ follows inverse trends. These results could explain why the Malian xylophone makers empirically use only the wood from EHW and MHW.

Keywords : xylophone vène wood Pterocarpus erinaceusPoir. extractives ring width acoustic property basic density





Author: Bakary Traoré Loïc Brancheriau Patrick Perre - Tatjana Stevanovic Papa Diouf

Source: https://hal.archives-ouvertes.fr/



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