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本文用有限元法对凹型弯张换能器的前三个共振频率和振动方式进行计算,与测量值比较并讨论了作为水下宽带声源的优点。同时,说明了所用计算机程序的特点。指出了有限元离散化方程组中电压-等效节点驱动力关系矢量和电流-节点振速关系矢量的一致性,从而得到更便于计算的方程组。对计算机统一处理轴对称问题和平面问题的方法和反共振频率的求法也作了说明。
In this paper, the first three resonant frequencies and vibration modes of concave flexural transducers are calculated by finite element method. Compared with the measured values, the advantages of this method as underwater wide-band source are discussed. At the same time, illustrates the characteristics of the computer program used. The consistency between the vector of voltage-equivalent node driving force and the current-node vibration velocity vector in finite element discretization equations is pointed out, and a more convenient system of equations is obtained. The method of calculating the axisymmetry and plane problems of a computer and the anti-resonance frequency is also described.