Abstract
It was previously reported that extractives from Pernambuco wood (a species from Leguminosae family, native to South America) are positive for acoustical performance of wood. Thus the present study set to investigate the effect of extraction in hot water and ethanol/acetone mixture on acoustical properties of Persian silk wood (Albizia julibrissin, a species from Leguminosae family, native to Iran). Contactless forced flexural vibration on both freeends of beams was performed on thin small specimens before and after extraction. Results showed that the extractive components soluble in hot water were positively useful to acoustical properties because removing these extractives reduced the acoustic property of the wood. Raw wood from Persian silk tree based on a combination of studied acoustical characteristics has theoretically the potential to be applied in violin backs and ribs.
Highlights
Iranian musical instrument technology, an experience-based, traditional knowledge, prefers tone woods i.e. mulberry, maple, and walnut; but after some special hydrothermal treatments (Roohnia et al 2011, Segolpayegani et al 2012)
Increases in sound radiation coefficient and/or decreases in damping due to internal friction totally appear in the concept of acoustical converting efficiency (ACE) (Yano and Minato 1993, Yasuda and Minato 1994, Rujinirun 2005, Brémaud 2012)
Extractive components soluble in hot water were positive to acoustical property while those soluble in ethanol/ acetone did not show this behavior
Summary
An experience-based, traditional knowledge, prefers tone woods i.e. mulberry, maple, and walnut; but after some special hydrothermal treatments (Roohnia et al 2011, Segolpayegani et al 2012). Some mechanical-acoustical properties of wood is defined; Damping due to radiation or namely sound radiation coefficient is an acoustical characteristic that depends on longitudinal modulus of elasticity and density (Rujinirun et al 2005, Wegst 2006, Tsoumis 1991). Increases in sound radiation coefficient and/or decreases in damping due to internal friction totally appear in the concept of acoustical converting efficiency (ACE) (Yano and Minato 1993, Yasuda and Minato 1994, Rujinirun 2005, Brémaud 2012). This property is restored within this paper for indicating the acoustical property of wood;
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