強力空中超音波放射用ダイアフラム式ホーンの開発 : 第2報, 音響放射の指向性およびダイアフラムの応力解析

抄録

A new type of solid horn with metallic diaphragms has been developed by the authors. The horn transduces the little longitudinal vibration to the extremely large flexural one. Therefore it is possible to shorten and to make lighter the ultrasonic vibration system by replacing connected horns to a simple new horn. It is thought that the horn is suitable as a high power ultrasound source, further the high efficiency of the sound radiation is obtained by the larger area and in-plase vibration of sound radiation face. Thus the authors have investigated a free vibration of a solid horn with double concentric diaphragms which has large displacement amplitude, large diameter and in-phase vibration. In this paper, the directivity of the solid horn with double concentric diaphragms are verifyed theoretically and experimentally, and compared to other ultrasonic sound sources. Furthemore, the stresses applied on the diaphragm analyzed using FEM to design the dimensions and to avoid stress concentration on diaphragm.