As an approximate method, with the trigonometric function, the simple pendulum dynamical equation is simplified, and the approximate formula for the period of simple pendulum movement is presented.
利用三角函数作为一种近似方法，对单摆的动力学方程进行了简化，给出了大角度条件下单摆运动的周期的近似公式。
A more precision formula for the period of a simple pendulum is obtained by using the method of variable be partly fixed.
利用“局部常化”方法给出了一个精度较高的单摆周期公式。
In this paper, simple pendulum motion is studied by means of the series perturbation method.
本文用级数微扰方法研究单摆运动。
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