为满足新颖成像模式对卫星姿态快速机动或对规划姿态的高精度跟踪控制需求,本文针对金字塔构型控制力矩陀螺(Control moment gyroscopes,CMG)群与反作用飞轮为联合执行机构的挠性敏捷卫星,提出一种融合以Legendre伪谱法实现卫星姿态及CM...为满足新颖成像模式对卫星姿态快速机动或对规划姿态的高精度跟踪控制需求,本文针对金字塔构型控制力矩陀螺(Control moment gyroscopes,CMG)群与反作用飞轮为联合执行机构的挠性敏捷卫星,提出一种融合以Legendre伪谱法实现卫星姿态及CMG群框架角速度最优规划的前馈控制、以非线性模型预测控制(Nonlinear model predictive control,NMPC)实现最优轨迹反馈跟踪的复合控制方法.在前馈控制律设计中,充分考虑了CMG群的力矩输出能力、奇异性及振动抑制性能等约束,规划获得了最优的CMG群框架角速度、卫星的姿态角及角速度.在反馈控制律设计中,以飞轮输出力矩能力、姿态机动快速性及能量为约束,设计了具有滚动优化思想的跟踪算法,补偿由于初始状态及转动惯量偏差等带来的控制误差.研究结果表明,在转动惯量存在偏差情况下,本文的控制方法仍是有效的,且表现出较强的鲁棒性.展开更多
以多样成像模式对挠性敏捷卫星姿态的快速机动控制为需求,本文针对金字塔构型控制力矩陀螺(control moment gyroscope, CMG)群为执行机构的挠性卫星,提出基于三段式正弦角加速度的姿态路径规划方法及具有滚动优化思想的跟踪控制算法.在...以多样成像模式对挠性敏捷卫星姿态的快速机动控制为需求,本文针对金字塔构型控制力矩陀螺(control moment gyroscope, CMG)群为执行机构的挠性卫星,提出基于三段式正弦角加速度的姿态路径规划方法及具有滚动优化思想的跟踪控制算法.在姿态机动路径规划方法设计中,融合谱分析及非线性优化方法,设计了兼顾卫星姿态机动快速性及抑制挠性附件振动性能的姿态轨迹;为实现对规划姿态轨迹的高精度跟踪,综合加权优化指标及奇异性、执行机构能力等约束,设计了金字塔构型CMG群框架角速度的非线性模型预测(nonlinear model predictive control, NMPC)跟踪控制律.在转动惯量存在测量误差及空间干扰情况下,多种姿态机动仿真表明,本文提出的控制方法是有效的,且表现出较强的鲁棒性.展开更多
Studied in this paper are the attitude control law design and the output torque estimation problem of micro control moment gyros (MCMGs) for the agile satellites executing rapid attitude maneuver mission. An algorit...Studied in this paper are the attitude control law design and the output torque estimation problem of micro control moment gyros (MCMGs) for the agile satellites executing rapid attitude maneuver mission. An algorithm is proposed for estimating the output torques and the gimbal angular rates of MCMGs, which can help engineers to choose reasonable size for actuators so that the cost of satellite can be decreased. According to some special maneuver missions, a numerical example of attitude control system for a small satellite with MCMGs in pyramid configuration is studied, and the simulation results validate the proposed estimation algorithm.展开更多
文摘为满足新颖成像模式对卫星姿态快速机动或对规划姿态的高精度跟踪控制需求,本文针对金字塔构型控制力矩陀螺(Control moment gyroscopes,CMG)群与反作用飞轮为联合执行机构的挠性敏捷卫星,提出一种融合以Legendre伪谱法实现卫星姿态及CMG群框架角速度最优规划的前馈控制、以非线性模型预测控制(Nonlinear model predictive control,NMPC)实现最优轨迹反馈跟踪的复合控制方法.在前馈控制律设计中,充分考虑了CMG群的力矩输出能力、奇异性及振动抑制性能等约束,规划获得了最优的CMG群框架角速度、卫星的姿态角及角速度.在反馈控制律设计中,以飞轮输出力矩能力、姿态机动快速性及能量为约束,设计了具有滚动优化思想的跟踪算法,补偿由于初始状态及转动惯量偏差等带来的控制误差.研究结果表明,在转动惯量存在偏差情况下,本文的控制方法仍是有效的,且表现出较强的鲁棒性.
文摘以多样成像模式对挠性敏捷卫星姿态的快速机动控制为需求,本文针对金字塔构型控制力矩陀螺(control moment gyroscope, CMG)群为执行机构的挠性卫星,提出基于三段式正弦角加速度的姿态路径规划方法及具有滚动优化思想的跟踪控制算法.在姿态机动路径规划方法设计中,融合谱分析及非线性优化方法,设计了兼顾卫星姿态机动快速性及抑制挠性附件振动性能的姿态轨迹;为实现对规划姿态轨迹的高精度跟踪,综合加权优化指标及奇异性、执行机构能力等约束,设计了金字塔构型CMG群框架角速度的非线性模型预测(nonlinear model predictive control, NMPC)跟踪控制律.在转动惯量存在测量误差及空间干扰情况下,多种姿态机动仿真表明,本文提出的控制方法是有效的,且表现出较强的鲁棒性.
基金supported by the National Natural Science Foundation of China(10872029)Excellent Scholars Fund of Beijing (20071D1600300398)Excellent Young Scholars Research Fund of Beijing Institute of Technology(2007YS0202)
文摘Studied in this paper are the attitude control law design and the output torque estimation problem of micro control moment gyros (MCMGs) for the agile satellites executing rapid attitude maneuver mission. An algorithm is proposed for estimating the output torques and the gimbal angular rates of MCMGs, which can help engineers to choose reasonable size for actuators so that the cost of satellite can be decreased. According to some special maneuver missions, a numerical example of attitude control system for a small satellite with MCMGs in pyramid configuration is studied, and the simulation results validate the proposed estimation algorithm.