Normal modes in the pole and important characteristic parameters such as resonance frequency and position of the displacement node are obtained using the finite element method.

并应用有限元法对变幅杆进行了模态分析，得到了共振频率和位移节点等重要参数。

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Then theoretical resonance length, small end diameter, displacement node, magnification factor, shape factor and other parameters of the amplitude amplifier pole could be determined.

确定出其理论共振长度、小端直径、位移节点、放大系数、形状因数等参数。

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By this equation, we can calculate the displacement, load and dynamometer diagram at every rod node and any time.

通过求解该方程，可计算各节点不同时刻的位移，计算出载荷，绘出各节点功图。

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