Abstract
This paper presents the theoretical method to determine the vibro-acoustic properties of struc tures embedding the piezoelectric elements. This method is based on the modal analysis technique that combines the vibratory characteritics of the structure, which is obtained by FEM calculation or experiment, and piezoelectric effect. Also taking acoustic radiation into consideration, fluid loading effect due to medium surrounding structures is included. As an example, vibratory and acoustic response of the transducer with node supporting devices are analyzed. Calculated results of electrically induced vibration, emitted sound pressure and directivity patterns agree well with the measured ones. Moreover, this node-support transducer with slight modification is applied to the ultrasonic ranging system, so called height sensor, for motion control of the high speed craft. Reduction of the self-noise induced by structural vibration and enlargement of the sound radiation power are achieved by use of this node-support transducer. The measured results of height show the good linearity and accuracy within the error of 0.04m.
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