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。
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.
为提高灭茬刀辊设计的可靠性和效率，基于UG - NX 3软件，根据运动方程绘制刀刃运动轨迹，形象直观的获取动态隙角。
For improving the design reliability and efficiency of the stubble roller, visualized dynamic gap Angle was obtained though drawing blade moving track according to movement equation using ug - NX3.
研究结果表明：利用升角与升弓高之间的关系，可简化受电弓运动微分方程的推导；
The results show that the equations have benefit to the deduction of the pantograph's mechanical differential equations.
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