An analytical treatment of the piezoelectric ceramic complete ring transducer undergoing flexural vibrations is presented. Conditions for the electromechanical excitation of the flexural vibrations are discussed and it is shown that the fundamental mode of the flexural vibration of a complete ring can be considered as sufficiently dominant over a broad frequency range. Hence, the one-dimensional equivalent electromechanical circuit representation of the transducer is applicable and all the parameters of the equivalent circuit are determined. Possibilities to optimize the effective coupling coefficient of the transducer by changing the extent of the electrodes on the piezoelectric body are considered. It is shown that for effective operation of the flexural ring transducer as a low frequency hydroacoustic projector the opposing quadrants (or three quadrants in case of a planar array configuration) have to be covered with baffles. The radiation impedance and directional factors of the transducers with baffles are considered. Limitations of the acoustical power radiated by the transducers are discussed.

译文

提出了对承受弯曲振动的压电陶瓷完整环形换能器的分析处理。讨论了弯曲振动的机电激励条件,表明完整环的弯曲振动的基本模式可以认为在很宽的频率范围内具有足够的优势。因此,换能器的一维等效机电电路表示是适用的,并且确定了等效电路的所有参数。考虑了通过改变压电体上电极的范围来优化换能器有效耦合系数的可能性。表明,为了有效地将弯曲环换能器用作低频水声投影仪,必须用挡板覆盖相对的象限 (在平面阵列配置的情况下为三个象限)。考虑了带挡板的换能器的辐射阻抗和方向因子。讨论了换能器辐射的声功率的局限性。

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