title: Broadband multimode baffled piezoelectric cylindrical shell transducers.
abstract: Hollow piezoelectric cylindrical shell transducers may be made directional for underwater acoustic applications by the use of suitable acoustical baffles and the operational bandwidth may be extended by using multiple resonant modes. A theoretical and experimental investigation was performed for circumferentially baffled piezoelectric cylindrical shell transducers operating in the zero and one modes of extensional vibration. The frequency responses and directivity patterns were analyzed under various conditions of energizing separate halves of electrodes. It was found that the broadest frequency response with nearly constant beamwidth can be obtained when the two halves of the piezoelectric ring are electromechanically excited 90 deg out-of-phase. The experimental results obtained with a proof-of-concept transducer were in good agreement with the theoretical predictions.
authors.affiliation: Acoustic Research Laboratory, Advanced Technology and Manufacturing Center, and Department of Electrical and Computer Engineering, University of Massachusetts Dartmouth, 151 Martine Street, Fall River, Massachusetts 02723-1502, USA.
authors.forename: Tetsuro
authors.initials: T
authors.lastname: Oishi
authors.forename: Boris
authors.initials: B
authors.lastname: Aronov
authors.forename: David A
authors.initials: DA
authors.lastname: Brown
mesh_terms: D000162:Acoustics / Q000295:instrumentation; D004566:Electrodes; D008433:Mathematics; D008962:Models, Theoretical; D015203:Reproducibility of Results; D013016:Sound; D014732:Vibration; D014867:Water
chemical_list: D014867:Water