Vibration and acoustic characteristics of piezoelectric ultrasonic transducers

초록

The paper deals with vibration and acoustic characteristics of piezoelectric ultrasonic transducers for distance measurement. The purpose of this research is to determine the vibration displacement distribution improving the acoustic directivity of an ultrasonic transducer because the measurable distance is longer with better directivity, which depends on the vibration of the transducer's housing plate. The response of the elastic circular plate excited by a small piezoelectric disc has been obtained by finite element analysis. Ultrasound radiating from the transducer plate has been considered in the acoustic finite element analysis. The acoustic results have been expressed in the form of sound pressure distributions, and then they have been transformed into beam pattern and acoustic directivity. The size of the piezoelectric disc relative to that of the elastic plate affects the vibration distribution and thus the acoustic directivity and beam pattern. We have achieved the basis of improving the acoustic directivity for design of ultrasonic transducers for long-distance ranging. © INTER-NOISE 2019 MADRID - 48th International Congress and Exhibition on Noise Control Engineering. All Rights Reserved.

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