The Study Of Directional Cylinder Transducer

Acoustic transducers made from piezoelectric ceramic cylinders usually exploit the breathing mode of vibration. However, with suitable voltage distribution, higher order extensional modes of the cylinder can be excited which produce directional radiation patterns. These modal radiation patterns can then be combined to synthesize desired beam patterns which may be steered by incrementing the excitation.This paper describes a modal for the combined acoustic response of the extensional modes of vibration of a piezoelectric ceramic cylinder. A method of synthesizing a desired radiation pattern and voltage distribution is given. Then the resonance frequency, the transmit volt resonance and the beam patterns of the transducer is archived by ANSYS. At last, an experimental implementation of a directional transducer that uses multimode techniques is fabricated.This transducer is broadband and directional with a frequency independent beam pattern yet simple, small, and lightweight.