Design of a synthetic aperture array to support experiments in active control of scattering

dc.contributor.authorDullea, James P.
dc.contributor.corporateCIVINS (Civilian Institutions)
dc.contributor.departmentMechanical Engineering
dc.dateJun-90
dc.date.accessioned2012-12-13T18:43:53Z
dc.date.available2012-12-13T18:43:53Z
dc.date.issued1990
dc.descriptionCIVINS (Civilian Institutions) Thesis documenten_US
dc.description.abstractA synthetic aperture acoustic array is used to as a spatial filter in a reverberant test facility. The array is used to examine the c' rge in the received signal when a fluid loaded steel plate is replaced by the free surface. Twenty millisecond active pulses at 2 kHz were scattered by the target plate and recorded by the synthetic aperture array for post processing. 'I ie method of reverberant field subtraction was utilized and found unsatisfactory for use with signals of 20 msec duration in a reverberant tank. Array processing using a rectangular amplitude function was marginally successful. A Chebyshev amplitude weighted array was successfully used to demonstrate the ability of a linear array to discriminate between the steel plate and free surface scattering. A computer aided interactive design tool was written to aid in the analysis of array architectures by calculating hydrophone amplitude weights, beamwidth, directivity index and graphically presenting the normalized directional beampattern. The program allows comparative analysis of two array designs simultaneously.en_US
dc.description.distributionstatementApproved for public release; distribution is unlimited.
dc.description.funderU.S. Naval Postgraduate School, CIVINS programen_US
dc.description.urihttp://archive.org/details/designofsyntheti1094524319
dc.identifier.urihttps://hdl.handle.net/10945/24319
dc.language.isoen_US
dc.publisherMonterey California. Naval Postgraduate Schoolen_US
dc.relation.ispartofseriesCIVINS (Civilian Institutions) Theses and Dissertations
dc.rightsThis 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.en_US
dc.titleDesign of a synthetic aperture array to support experiments in active control of scatteringen_US
dc.typeThesisen_US
dspace.entity.typePublication
etd.thesisdegree.grantorMassachusetts Institute of Technologyen_US
etd.thesisdegree.levelMastersen_US
etd.thesisdegree.nameMaster of Science in Mechanical Engineeringen_US
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