棒状発音体の研究
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概要
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The so-called "cantilever bell" is a kind of percussion instrument used mainly in a clock and consists of a straight rod of bronze or steel with a slender portion at the clamped end. The characteristics of strike tone of this instrument depend on the dimension of this portion. In this paper we investigated analytically by Cowley-Levy's method the effects of narrowing the section of rod at the clamped end on the natural frequencies of the system and obtained the general equation that determine the frequencies of overtone of this bell. From this equation it is shown that the cantilever rod with an extreme slender portion at the clamped end can be regarded as one end supported rod instead of one end clamped rod. As we well know, the overtones of the cantilever rods with uniform section are not harmonics but if the rod has the section narrowed suitably in the neighborhood of the clamped end, they harmonize partly, and also a fundamental tone is greatly decreased in frequency.
- 社団法人日本音響学会の論文
- 1960-09-30