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。
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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