等效电路图就是将一个复杂的电路通过适当的方法改画出简单的串联、并联的电路。这个简单的电路，叫作原复杂电路的等效电路图 。
依据四端网络的基本原理，利用力电类比的方法，给出了复合变幅杆的等效电路图；
Based on the theory of four-end network, the equivalent electric circuit diagrams of the horn are given by using the analogous method between methanical force and electric.
对其工作原理进行分析，给出不同工作模式下的等效电路图和回路的参数设计原则。
The equivalent circuits at different operation modes, the analysis of the circuit and principle of parameter design were presented.
主要工作如下：1、根据夹心式换能器的机电等效电路图，推导了换能器的整体频率方程。
The main aspects are as follows:1. Derivate the resonance frequency equation according to the electro-mechanical equivalent circuit of sandwich transducer.
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