This paper assumes the rotational angular velocity of a crane according to the experimental sine rule, and derives the nonlinear differential equations of the swing Angle.
本文以实验为依据，假定起重机的旋转角速度按正弦规律变化，推出货重偏摆角的非线性微分方程。
The rule of magnetic induction density, induced eddy current and electromagnetic force varied with high frequency sine exciting current was investigated.
利用瞬态分析方法，研究高频正弦激励电流密度在结晶器内钢液中产生的磁感应强度、感应电流及电磁力的变化规律。
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