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Hudoba de Badyn, Mathias

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.

Text

University of British Columbia. Science One Research Projects

Vancouver : University of British Columbia Library

10.14288/1.0107235

Science, Faculty of

Unreviewed

http://creativecommons.org/licenses/by-nc-nd/4.0/