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.
将杆作自由振动的微分方程作降阶处理后，和梁的弯曲理论作类比，给出了一个迭代算法。
After reduce the bar's free vibration differential equation to a lower order, we analogize it to the bending theory of the beam and gives an iterative procedure.
大变形围岩的锚杆支护设计一般还是采用经验类比法，主要原因之一是不能合理确定锚杆的承载能力。
The bolting design of large deformation surrounding rock usually depends on experience, one of the main reasons is the bearing capacity of bolts.
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