使用混合执行机构的快速机动卫星力矩分配算法

Hybrid Actuator Control Torque Allocation Algorithm for Rapid Maneuver Satellite

针对单框架控制力矩陀螺群(SGCMGs)存在奇异和单框架控制力矩陀螺(SGCMG)存在框架转速死区的问题,研究了SGCMG与飞轮联合作为执行机构的控制力矩分配算法,以SGCMG功耗、飞轮功耗和飞轮角动量的二次型加权矩阵求和为性能指标,提出了一种形式简洁的混合执行机构力矩分配算法,通过分析,证明该分配算法能够有效的避免SGCMGs的奇异;设计了一种SGCMG功耗加权矩阵的调节策略,解决了SGCMG陷入转速死区的问题,设计了一种飞轮角动量加权矩阵的调节策略,通过对加权矩阵的实时调节实现了对飞轮角动量的管理,解决了飞轮转速的饱和与过零问题。数学仿真结果验证了该力矩分配算法的有效性。

For the problem of the singularity inherent in the system of single gimbal control moment gyros（SGCMGs） and the gimbal speed dead zone in the presence of single gimbal control moment gyro（SGCMG）,a torque allocation algorithm for the hybrid actuators consisted of SGCMGs and flywheels is researched in this paper.The sum of SGCMG power consumption,the flywheel power consumption and flywheel angular momentum with different weights is treated as the performance index,the torque allocation algorithm for hybrid actuators is achieved by minimizing the performance index.The allocation algorithm＇s validity in avoiding singularities of SGCMGs is demonstrated by analyzing the allocation algorithm.The adjustment strategy of SGCMGs＇ power consumption weighted matrix is designed by which the problem that the gimbal speed gets into dead zone is solved.The adjustment strategy of flywheel angular momentum weighted matrix is designed,the management of flywheel angular momentum is achieved,and the problem of flywheel speed passing zero and momentum saturation are solved in some degree by adjusting the weighted matrix.At last,the satellite attitude simulation is presented to prove validation of the torque allocation algorithm.