DocumentCode :
2761494
Title :
High frequency triply resonant broadband transducer array development at NUWC
Author :
Butler, Stephen C.
Author_Institution :
Naval Undersea Warfare Center Div, Newport, VA, USA
Volume :
5
fYear :
2003
fDate :
22-26 Sept. 2003
Abstract :
Summary form only given. With the Navy´s current emphasis on detection in littoral environments requires the use of broadband sonar signal processing and frequency agility. This has prompted the need for new classes of broadband sonar transducers that can transmit and receive these complex signals. NUWC has developed and built a new class of novel high-frequency (HF) broadband (electro-acoustic) transducers and arrays that can be configured into conformal arrays for use on the bow or sail of present and future classes of submarines, unmanned undersea vehicles (UUVs), and on torpedo homing sonar systems. This transducer design, the Triply Resonant Tonpilz (TRT), is a mechanical series arrangement of a piezoelectric ceramic stack, two center masses, two compliant springs, and a tail and head mass, all together generating three resonances. The design produces a flat transmitting response of two octaves when in an array-loaded configuration. The increase in operating bandwidth is achieved without the use of exotic and expensive transduction materials. This triply resonant transducer is a very cost competitive approach to introducing broadband into the Fleet. It provides a 5 kHz to 10 kHz increase in bandwidth at the low end of the band over a traditional tonpilz transducer. A traditional tonpilz designed to encompass this lower frequency would be at least 50% to 75% longer, which is unsatisfactory in these applications that require minimal impact on the submarine. The results of two 36 element planar HF arrays that are currently being designed, fabricated, and tested NUWC is presented, modeled results of a more compacted (22% smaller) Triply Resonant Tonpilz using PMN-PT single crystal as the active driver is also presented. A smaller 9 element VHF array design that is three times smaller than the HF design is also presented.
Keywords :
acoustic transducer arrays; military radar; oceanographic equipment; oceanography; sonar arrays; underwater vehicles; 5E3 to 10E3 Hz; HF transducers; NUWC; Navy; PMN-PT single crystal; TRT; Triply Resonant Tonpilz; UUV; VHF array design; array-loaded configuration; broadband sonar signal processing; broadband sonar transducers; broadband transducer array; conformal arrays; electro-acoustic transducers; flat transmitting response; frequency agility; high-frequency transducers; littoral environments detection; mechanical series arrangement; operating bandwidth; piezoelectric ceramic stack; planar HF arrays; submarines; torpedo homing sonar systems; transducer design; triply resonant transducer array; unmanned undersea vehicles; Array signal processing; Bandwidth; Ceramics; Hafnium; Piezoelectric transducers; Resonance; Resonant frequency; Sonar detection; Springs; Underwater vehicles;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
OCEANS 2003. Proceedings
Conference_Location :
San Diego, CA, USA
Print_ISBN :
0-933957-30-0
Type :
conf
DOI :
10.1109/OCEANS.2003.178285
Filename :
1282911
Link To Document :
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