【摘要】 假定地球是一个三轴刚性体,在Euclid空间中做自由旋转。在设定主惯性矩A小于B小于C的情况下,求解欧拉运动方程,得到数值解。计算结果表明:地球在除了自转和自由进动之外,同时还存在着自由章动。章动角会随着时间做周期性变化。重点讨论的是章动角的变化。更多还原

【Abstract】 The Earth is taken as a triaxial rigid body,which rotates freely in the Euclidian space.The starting equations are the Euler dynamic equations,with A smaller than B and B smaller than C.The Euler equations are solved,and the numerical results are provided.Calculations show that,besides the self-rotation of the Earth and the free Euler procession of the Earth’s rotation,there exists the free nutation:the nutation angle,the angle between the Earth’s momentary rotation axis and the mean axis,changes with time,but periodically.The free nutation is especially investigated.更多还原