Mechanical fields of the piezoceramic radiator of strength design situated near acoustical baffle

Abstract

Article describes the mechanical fields of the cylindrical piezoceramic transducer of the strength design, with circular polarization located near cylindrical acoustical soft baffle. As an investigated parameter of the mechanical field of transducer chosen the oscillating velocity of the surface of transducer, because, studying of this parameter has huge interest in practical applications, because on the construction stage of the creating of sonar array we have to know the maximum mechanical loads that arise in the transducer during its operation, and in the classical methods for calculating oscillating velocity of the surface of transducer is set to the constant value, so it can’t identify the changes in the characteristics of the oscillating velocity on the surface of transducer, caused by the interaction between the elements of the array. Unlike the classical methods, oscillating velocity on the surface of transducer is not constant value, and numerical calculations of the physical fields provided, beginning from the electrical input of transducer. Equations, used for calculating numerical values of the oscillating velocity, obtained, using the results of solution of the “pass-through” problem of sound radiation of the cylindrical sonar array formed with cylindrical piezoceramic transducers with circular polarization and cylindrical acoustic soft baffle located in the middle of the array. This solution allows us to take into consideration interaction of the fields in the transducer itself and into array entirely. The numerical analysis of the dependencies of oscillating velocity of the surface of the transducer provided both, for frequency dependence and angle dependence. The analysis provided both, for amplitude and phase characteristics of the velocity. For the frequency dependencies we studied the oscillating velocity in the point on the surface of transducer, that lays in the opposite direction to the baffle, and for angular dependencies we chosen some interesting frequencies to provide the investigations. This frequency and angular characteristics were compared between themselves and with characteristics of transducer itself, without baffle, for situations, when we changed the distance between the transducer and the baffle and the dimensions of the baffle were constant and when we changed the dimensions of the baffle without changing the distance between baffle and the transducer. As a result of investigations we have determined physical causes of the changes in the oscillating velocity of the surface of cylindrical piezoceramic transducer as a part of the system “radiator – baffle”.Ref. 6, fig. 4.