Abstract
The problem of increasing the effi ciency of the sonar station by using a sonar antenna with an active acoustic screen is stated. Electrical control of the acoustic properties of such baffl e can provide a wide range of dynamic capabilities of the acoustic antennaand technical implementation due to this in one sonar station of several modes of its operation. Analitical expressions for quantifying the electrical, mechanical and acoustic fi elds of an antenna with a dynamic change in the parameters of the active screen using the method of coupled fi elds in multiconnected domains are obtained. A qualitative analysis of the infl uenceof individual physical factors and their mathematical analogues in the obtained analytical relations on the dynamic properties of fields are carried out.
Highlights
One of them is the transition to dynamic methods of controlling the parameters of the sonar antenna of these stations
The simplest technically this can be realized using the electrical side of sonar antenna transducers
Certain possibilities in the dynamic control of antenna parameters manifested in the replacement of passive acoustic baffles with active piezoceramic shells
Summary
The problem of increasing the efficiency of the sonar station by using a sonar antenna with an active acoustic screen is stated. Universatility necessitates the control of the parameters of the elements that are part of the GAS − transducers [9 − 11], acoustic screens [9], configurations and sizes of sonar antennas [12] These parameters include directional properties, resonant frequencies, impedances of electrical excitation and radiation, and so on. During the conversion of energy in each of the elements of the antenna there is a connection of electric, mechanical and acoustic fields, and during its formation, due to the repeated exchange of radiated and reflected waves between the transducer and the screen, their acoustic interaction In mathematical terms, these physical factors are taken into account by a joint solution of the system of differential equations in the coordinates of Figs. Algebraization of functional equations (1) − (6) using relations (9) − (12) and properties of completeness and orthogonality of angular functions on the interval [0, 2π π], allows to obtain an infinite system of linear algebraic equations for determining unknown coefficients of decomposition unS , wnS , AnS BnS and as: BnS Jn (kS r1S ) icS wnS 0; icwnS (1) n
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