This study presents the vibration response of an elastic disc that is harmonically excited by a piezoelectric circular patch in an ultrasonic sensor structure. The ultrasonic sensor employed is composed of an elastic disc coupled with a cylindrical wa...
This study presents the vibration response of an elastic disc that is harmonically excited by a piezoelectric circular patch in an ultrasonic sensor structure. The ultrasonic sensor employed is composed of an elastic disc coupled with a cylindrical wall and attached by a small piezoelectric circular patch. The response equation was theoretically obtained by considering axially symmetric bending moment excitations for the elastic disc with a fixed boundary. The vibration response distribution of the elastic disc coupled with a cylindrical wall was analyzed using finite element analysis to enhance the theoretical result. Experiments were performed to confirm the response distribution in an enlarged specimen of the ultrasonic sensor structure. The theoretical and experimental results were compared and the radius ratio with maximum amplitude was confirmed. The vibration distribution obtained could be used for analyzing the acoustic characteristics of ultrasound radiating from an ultrasonic sensor for distance measurement.