ビオラおよびセロの音響学的研究

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The present investigation was undertaken to study the frequency characteristics and the normal mode of vibration of viola and violoncello bodies, and to present a comparison with the results which we had reported on violins. 3 violas and 2 violoncellos were used for the experiment and the method of investigation was similar to that adopted in the previous study on the violins. It was found that the frequency characteristic curves of the viola and violoncello were similar to those of the violin and that the vibrational figures of the viola also resembled those of the latter, but that the figures of the violoncello were different. The resonance of the air cavity of the body occurred at a frequency of about 250 cps for the viola and at about 95 cps for the violoncello, which is the resonant frequency of the Helmholtz type resonator. It occurred at a frequency of about 300 cps for violin. These values were in good agreement with the values calculated from their dimensions. Frequencies of the normal mode of the violas were almost 0. 8-0. 9 times those of the corresponding mode of the violin and the values were as presumed from their sizes. As mentioned above, we could not find any vibrational mode in the violoncello which corresponded to that of the violin. We have as yet not been able to explain this satisfactorily, but we may say that the cause of the difference might have lain in the side-board vibration, for the ratio of side board of violoncello to violin is about twice as large as the ratio of surface length.
社団法人日本音響学会の論文
1955-03-30

ビオラおよびセロの音響学的研究

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