Three-dimensional finite element model of a high power, low frequency ring-shell flextensional sonar transducer
Pinto, Rogerio Nacimento Costa
Baker, Steven R.
Pieper, Ron J.
Wilson, Oscar B.
MetadataShow full item record
A three-dimensional finite element model of a high power, low frequency ring-shell flextensional transducer (Sparton of Canada, Ltd. Model 34A0610 (Ref. 1) was developed for use with the ATILA code (Ref. 2). This transducer is to be coupled with an analytical acoustic field description in order to model a dense sonar array of US Navy interest (Ref.3) The three-dimensional model was derived from a two0dimensional model provided by the Naval Undersea Warfare Center (Ref. 4). Two types of finite-element analyses were performed using ATILA: (1) an in-air modal analysis, in which the eigenfrequencies and eigenmodes are computed, and (2) an in-water harmonic analysis, in which the pressure field at a desired driving frequency is computer. The frequency of the ring mode computed for the three-dimensional model in the modal analysis was found to be 5 percent higher than the corresponding value for the two-dimensional model.. From the harmonic analysis, the maximum sound pressure level on the acoustic axis was found to be 4 dB higher than the manufacturer's measured value and is located at exactly the same frequency.
Approved for public release; distribution is unlimited
Showing items related by title, author, creator and subject.
Grachev, Andrey A.; Andreas, Edgar L.; Fairall, Christopher W.; Guest, Peter S.; Persson, P. Ola G. (2014-04);This article describes a local similarity theory for developed turbulence in the stably stratified boundary layer that is based on the Brunt–V¨ais¨al¨a frequency and the dissipation rate of turbulent kinetic energy instead ...
Stewart, Andrew D (Monterey, California. Naval Postgraduate School, 1997-09);While time difference of arrival (TDOA) information is sufficient to passively solve for the location of a radio frequency transmitter, frequency difference of arrival (FDOA) information may be added to the TDOA information ...
Assessment of the performance of the near-bottom hydrophones of the U.S. Navy Southern California offshore range in detecting, localizing and reconstructing 10-20KHZ odontocete whistles Hager, Carl Allen. (Monterey, California. Naval Postgraduate School, 2008-03);A series of 10 to 20 kHz, frequency-sweeping signals synthesizing whistles of vocalizing Odontocetes was transmitted from a J-9 sound projector suspended from the Research Vessel Pt Sur while over the U.S. Navy Southern ...