抄録
An automatically performing bell system, which informed the specified time with music, has many types of bell configuration and arrangement. The first requirement for the bell system is to tune the fundamental resonance frequencies of each bell to an equal temperament of scale. Finite Element Method was used to determine the natural frequency of the bell and the effect of bell profile such as thickness and diameter on the natural frequencies was analyzed. The tuning algorithm of the fundamental and higher mode frequencies by changing the inner profile of the bell to improve the sound quality was developed by use of FEM and its availability was confirmed. Moreover, Boundary Element Method was applied to evaluate the sound radiation efficiencies of natural vibration modes of the bell.
