This paper studies the nonlinear motion law of a simple pendulum with damping factor.
本文研究具有阻尼因素的单摆非线性运动规律。
Methods: A brain concussion was produced in rats using a simple pendulum device model.
方法：应用自制单摆式闭合性机械打击装置建立脑震荡大鼠模型；
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。
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