ANALYTICAL STUDIES OF DOME-TRANSDUCER INTERACTIONS
TRACOR INC AUSTIN TX
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This report summarizes analytical studies conducted during the past year to determine the interaction of sonar domes and transducers during transmission. A general description of the mathematical model used in the analysis is given together with some improvements which have been incorporated in the model during the past year. The results of a study of the dependence of certain performance criteria such as directivity index on the parameters of the dome-transducer model is reviewed. In addition, a general description of developments related to the treatment of viscoelastic dome materials and nonconcentric dome shapes is given. The conclusions drawn in the various technical memoranda submitted during the year are restated in this report. Briefly these are a the dome tends to offset the gains in side lobe reduction obtained by shading the transducer elements, and b the most important property of the dome model in determining its effects on various transducer performance criteria is its surface density product of mass density and thickness. These conclusions are supported by numerical results presented in the report. Finally, some recommendations for the continuance of studies of dome-transducer interactions are given. These include an emphasis on the development of a dome-transducer model of more general configuration and the desirability of an experimental program to support the analytical studies.
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