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

The specific dynamic elastic modulus, acoustic radiation, logarithmic decrement, sound transmission parameter, and 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, ethanol. A larger improvement was achieved after benzoyl alcohol dichloromethane than using ethanol water. It is necessary to improve the vibrational properties solve problem resource shortage excellent for soundboards musical instruments use value wood. effects on evaluated. After untreated samples measured free-free flexural vibration test method a fast Fourier transform spectrum analyzer (FFT, CF-5220Z), separately performed 15 days at room temperature pressure, followed drying. treated then measured, effect analyzed. increase in modulus highest (14.5%) treatment. radiation clearly (18.1%). impedance decreased significantly (−4.35%), while decrement reduced (−52.0%) From viewpoint energy utilization, treatment, parameter increased 124% 125%, respectively. degree differed depending solvent used. Greater observed as compared