BTech Acoustics LLC, Advanced Technology and Manufacturing Center, University of Massachusetts Dartmouth, 151 Martine Street, Fall River, Massachusetts 02723, USA.
J Acoust Soc Am. 2013 Aug;134(2):1021-30. doi: 10.1121/1.4812760.
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.
本文对经历弯曲振动的压电陶瓷完整环换能器进行了分析处理。讨论了弯曲振动的机电激励条件，并表明完整环弯曲振动的基频在很宽的频率范围内占据主导地位。因此，该换能器的一维等效机电电路表示是适用的，并且等效电路的所有参数都已确定。通过改变压电体上电极的范围，可以考虑优化换能器的有效耦合系数。结果表明，为了使弯曲环换能器作为低频水声发射机有效工作，必须用挡板覆盖其相对的象限（在平面阵列配置的情况下为三个象限）。本文还考虑了带挡板的换能器的辐射阻抗和指向性因数。讨论了换能器辐射声功率的限制。
