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The effects of violin varnish on the acoustic properties of Picea Engelmannii

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Title: The effects of violin varnish on the acoustic properties of Picea Engelmannii
Author: Hudoba de Badyn, Mathias
Issue Date: 2011-04
Publicly Available in cIRcle 2011-06-23
Series/Report no. University of British Columbia. Science One Program. Research Projects 2010-2011
Abstract: Acoustic spectral analysis was performed on plates of Picea Engelmannii (Engelmann Spruce) before and after application of one of 3 types of varnish. The first overtone of each sample was driven through tapping by hand, and analyzed through a Fast Fourier Transform algorithm. The resulting acoustic spectrum was used to determine the frequency, quality factor Ǫ, attenuation rate and damping coefficient ζ changes as a result of the varnish application. A colophony-linseed oil and shellac-spirit varnish, and polyester lacquer were tested. A formula for predicting frequency shift based on mass and thickness of varnish added was determined, and varying trends of Q, α and ζ were reported. Wave propagation and the plate mechanics were analyzed.
Affiliation: Science, Faculty of
URI: http://hdl.handle.net/2429/35734
Peer Review Status: Unreviewed
Scholarly Level: Undergraduate

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