克服旋转飞行器螺旋运动的方法研究

Research on overcoming the coning motion of rotary spacecraft

旋转飞行器虽然具有内在稳定性 ,但在飞行过程中一些不确定因素会导致飞行器产生螺旋运动 ,而非理想的关于角动量矢量纯粹的旋转运动。结合旋转飞行器自身的特点 ,借鉴自旋卫星的被动章动阻尼的方法 ,提出了一种通过主动控制飞行器内部质量块的运动使得飞行器原先的惯量主轴发生偏移 ,惯量矩阵由原来的对称阵变为含有非零非对角元素的矩阵 ,从而改变飞行器的姿态角运动来克服螺旋运动的方法 ,这将有助于提高旋转飞行器的姿态控制精度。以某型旋转飞行器为背景进行仿真研究 。

Although spin about a principal axis is a common technique for providing attitude stabilization of simple spinner spacecraft, some balancing uncertainties often produce a spiral motion rather than the pure spin about the angular momentum vector.The paper presents a brand new method to overcome the coning motion of rotary spacecraft by actively controlling the motion of the internal moving mass.This method combines the characteristics of the rolling spacecraft itself and the passive nutation damping method of the momentum satellite, changes the position of the control mass so as to introduce the nonzero off diagonal terms in the inertia matrix.Consequently, the spacecraft attitude angle is adjusted.The application of this method will greatly improve the attitude control accuracy.A certain type of rotary spacecraft is taken as an example for simulation.The final computation results verify that the new way to decone the rolling spacecraft is effective and practical.