In the process of traditional plate tuning, luthiers flex free plates of bowed string instruments in various directions by hand and then judge the stiffness characteristics by experience. Modern experimental methods such as the Chladni technique and holographic interferometry can visualize eigenmodes related to stiffness parameters of free plates. However, few of them can be quantified effectively. In a previous paper, three new devices were presented to test the effective stiffness parameters that give rise to three prominent eigenmodes instead of manual testing. These devices raise a new direct method to measure the effective material properties. The object of this article is to further examine the reliability of this method by comparing the measurements of material properties produced by three devices directly with the results calculated by indirect methods based on the flat plate theory proposed by Schelleng. Experiments are carried out on two pairs of free violin plates. Results suggest that this new method could provide valuable insight into material selection and plate design.
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