Modeling and Control Strategy for a Flexible Spacecraft When it Encounters and Observes the Target
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摘要: 针对挠性航天器掠飞观测目标时的建模与控制问题, 提出了一种期望姿态运动规 律解析模型和输出反馈自适应滑模控制律. 通过定义期望姿态坐标系, 将挠性航天器掠飞 观测目标时的姿态指向运动转化为坐标系旋转运动. 基于绝对轨道递推, 推导出 其掠飞观测目标时的期望姿态运动规律解析模型, 进而建立了挠性航天器观测目标时的相对姿态动力学模型. 在此动力学模型基础上, 考虑惯量不确定性、挠性 模态不可测和未知有界干扰, 基于Lyapunov稳定性原理设计了含有惯量自适应 律和挠性模态观测器的滑模控制律, 给出了全局渐近稳定性证明. 数值仿真结 果表明, 所建模型和设计控制律是有效的.Abstract: Taking advantage of encountering and observing is a very important approach for space situational awareness during space operations. For the modeling and control strategy of a flexible spacecraft when it encounters and observes the target in space, an analytic desired attitude motion law and an output feedback adaptive sliding mode control are presented. By defining the desired attitude coordinate system, the attitude pointing motion of the chaser when it encounters and observes the target is transformed to the coordinate system rotation. The analytic desired attitude motion law is derived based on the orbit motion in inertia coordinate system, and further is the relative attitude dynamic model of the flexible spacecraft when it observes the target. Based on this dynamic model, considering inertia uncertainty, flexible mode immeasurability and unknown bounded interference, the attitude sliding mode control containing inertia adaptive law and flexible modal-observer is obtained using Lyapunov stability theory, and the global asymptotic stability of the systems is proved. Simulation results show that the model and the control law are effective.
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