On the use of sympathetic resonators to improve low frequency transducer performance
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Authors
Ellsworth, John Merle
Subjects
Low frequency active
multiple scatter
sympathetic resonance
quasiresonance
coupled network analysis
multiple scatter
sympathetic resonance
quasiresonance
coupled network analysis
Advisors
Baker, Steven R.
Date of Issue
1990-09
Date
1990-09
Publisher
Monterey, California: Naval Postgraduate School
Language
Abstract
The achievable gain in the radiation resistance and directivity of a low frequency underwater transducer due to the presence of an array of sympathetic resonators was analyzed. The resonators were all taken to be air bubbles, and both the resonators and transducer were taken to be compact (ka1) . The resonators were taken to be equally spaced around a circle of radius R, with the transducer located on the axis. The gain was calculated for various numbers of resonators as a function of ka (resonators), ka transducer and kR, for the transducer in the plane of the resonators and out of the plane a distance of one quarter wavelength. For the transducer in the plane, a gain in radiation resistance of approximately two possible with six or more resonators. For the transducer out of the plane, it is shown that a significant gain in directivity can be achieved at the expense of a slight decrease in the gain in the radiation resistance.
Type
Thesis
Description
Series/Report No
Department
Engineering Acoustics Academic Committee
Antisubmarine Warfare Academic Group
Organization
Naval Postgraduate School (U.S.)
Identifiers
NPS Report Number
Sponsors
Funder
Format
xii, 54 p. ill.
Citation
Distribution Statement
Approved for public release; distribution is unlimited.
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.