Hi all, The vibration properties of primary interest for constructing a soundboard are, the speed of sound and the damping capacity or internal friction. The speed of sound in wood varies directly with the square root of the modulus of elasticity and inversely with the square root of the density. The speed of sound in wood also decreases with an increase in temperature or moisture content. When wood is strained, some energy is dissipated as heat. This is done through internal friction. Internal friction increases as the moisture content increases. This url may be of interest: http://www.phy.duke.edu/~dtl/36hd_pno.html and also this: http://www.uk-piano.org/sound.html Regards, Don Rose, B.Mus., A.M.U.S., A.MUS., R.M.T., R.P.T. mailto:drpt@sk.sympatico.ca http://us.geocities.com/drpt1948/ 3004 Grant Rd. REGINA, SK S4S 5G7 306-352-3620 or 1-888-29t-uner
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