The design of a wideband and widebeam piston transducer in a finite closed circular baffle

Date
2008-06-07
Advisor
Supervisor
Co-Advisor
Co-Supervisor
Instructor
Source Title
Proceedings - European Conference on Noise Control
Print ISSN
2226-5147
Electronic ISSN
Publisher
Volume
Issue
Pages
1919 - 1924
Language
English
Type
Conference Paper
Journal Title
Journal ISSN
Volume Title
Series
Abstract

The design of a high power piezoelectric underwater transducer operating at frequency range 40 kHz-80 kHz with acoustic power capability in excess of 250W is described. The transducer consists of two back-toback elements. Each element is formed by stacked PZT-4 ceramic rings, a matching and a steel backing layer, and placed in a finite rigid circular baffle. We investigate the dependence of bandwidth and beamwidth to the combination of piston and baffle radii, a and b, respectively. With ka of 2.45 (κ is the wave number) at resonance and a b/a ratio of 2, the transducer resonates at 60kHz with 67% bandwidth and has a beamwidth of 60° at each half space. We show that when two transducers are placed at right angles spatially and driven in parallel, we can obtain an omnidirectional beam pattern in the lower frequency band. The beam pattern exhibits two dips in each quadrant at the higher end of the frequency band, which are within 8 dB. We also investigated power handling capability of the transducer from thermal point of view using finite element analysis. The input impedance measurements agree well with the numerical results within the pass band.

Course
Other identifiers
Book Title
Keywords
Finite baffle, High power, Underwater acoustic transducer, Wide beamwidth, Wideband, Finite baffle, High power, Lower frequencies, Numerical results, Power-handling capability, Underwater transducers, Wide beam widths, Wide-band, Bandwidth, Directional patterns (antenna), Electric impedance measurement, Finite element method, Frequency bands, Underwater acoustics
Citation
Published Version (Please cite this version)