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提出并研究了一种新型的Cymbal换能器。与传统的Cymbal换能器相比,该换能器中的压电陶瓷圆盘由一个金属圆环和压电陶瓷圆盘的径向组合体所代替。论文首先探讨了压电陶瓷圆盘和金属圆环组合体的径向振动,用解析方法得出了其径向振动的机电等效电路。在此基础上,得出了新型Cymbal换能器的机电等效电路,并得出了其共振及反共振频率方程。其次,利用数值计算方法,对这种新型的Cymbal换能器的共振频率和振动性能进行了研究。分析了Cymbal换能器的几何尺寸对其共振频率及有效机电耦合系数等参数的影响,探讨了其输入导纳的频率特性。所得结论为此类Cymbal换能器的优化设计及工程应用奠定一定的理论基础。本文提出的新型Cymbal换能器具有较大的几何尺寸、较高的机械强度以及功率容量等优点,可望在较大功率的水声及超声辐射器中获得较为广泛的应用。
A new type of Cymbal transducer is proposed and studied. In contrast to conventional Cymbal transducers, the piezoelectric ceramic disc in this transducer is replaced by a radial combination of a metal ring and a piezoelectric ceramic disc. The dissertation first discusses the radial vibration of the piezoelectric ceramic disc and the metal ring assembly, and obtains the electromechanical equivalent circuit of its radial vibration by analytical method. On this basis, the electromechanical equivalent circuit of the new Cymbal transducer is obtained, and the resonance and anti-resonance frequency equations are derived. Secondly, the resonant frequency and vibration performance of the new Cymbal transducer are studied by numerical method. The influence of geometrical size of Cymbal transducer on its resonant frequency and effective electromechanical coupling coefficient is analyzed. The frequency characteristics of its input admittance are discussed. The conclusions obtained lay a theoretical foundation for the optimization design and engineering application of such Cymbal transducers. The new Cymbal transducer proposed in this paper has the advantages of large geometry, high mechanical strength and power capacity. It is expected to be widely used in more powerful underwater acoustic and ultrasonic radiators.