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。
The paper discusses the law of the damping-without-drive simple pendulum motion through phase-graph method.
用相图法分析讨论了有阻尼无驱动单摆的运动规律。
Analytical approximate periods and periodic solutions to large amplitude oscillation of a simple pendulum are constructed using a new method.
构造了单摆大振幅振动的高精度解析逼近周期和周期解。
An excellent approximate solution of the motion of a nonlinear simple pendulum is obtained by the method of Green's function.
应用格林函数方法，给出了非线性单摆运动的较好近似解。
An excellent approximate solution of the motion of a nonlinear simple pendulum is obtained by the method of Green's function.
应用格林函数方法，给出了非线性单摆运动的较好近似解。
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