Abstract
A computer model of cylindrical piezoceramic transducer with interior solid filling based on the mixed finite element—boundary element method is examined. The work of the transducer with calculation of acoustic radiation to water is considered. The transmitting voltage responses and beam patterns of the transducer are presented. If the filling has small acoustic resistance, the transmitting voltage response of this transducer has two maxima, thus the transducer with interior solid filling is similar to free-flooded transducer. The first (low-frequency) maximum is connected with the resonance of the interior filling, the second maximum is connected with the resonance of the piezoceramic cylinder. If the filling has great acoustic resistance, the transmitting voltage response of this transducer has one maximum only. The optimum length of the transducer is determined. At the optimum length the frequency characteristic of the radiation-voltage response becomes uniform and wide band; i.e., at this length, the responses at the volume and radial resonances are approximately equal, and the response flatness (the difference between the values at the two resonances and at a minimum between them) is within 3 dB.
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