This paper assumes the rotational angular velocity of a crane according to the experimental sinerule, 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。
2
The rule of magnetic induction density, induced eddy current and electromagnetic force varied with high frequency sine exciting current was investigated.