挠性欠驱动航天器的姿态镇定方法
发布时间：2018-12-31 18:52
【摘要】：针对挠性欠驱动航天器的姿态系统的镇定问题,提出了一种基于自适应观测器的容错控制方法,使得航天器的角速度和姿态收敛到有界的区域.所考虑的挠性航天器几乎是轴对称的,其中小参数ε给出了航天器关于欠驱动轴的非对称性的度量程度.首先,利用齐次系统的思想简化系统的模型,消除部分难以处理的耦合项;其次,设计自适应观测器实现对挠性非线性项的未知信息进行估计,并给出观测值与真值的范数界限;进而设计容错控制器使得系统的输出对于耦合项的估计是输入状态稳定的.最后,仿真结果验证了所提方法的有效性.
[Abstract]:Aiming at the problem of attitude stabilization of flexible underactuated spacecraft, a fault tolerant control method based on adaptive observer is proposed, which makes the angular velocity and attitude of spacecraft converge to a bounded region. The flexible spacecraft under consideration is almost axisymmetric, in which the small parameter 蔚 gives the degree of asymmetry of the spacecraft with respect to the underdrive axis. Firstly, the idea of homogeneous system is used to simplify the model of the system and eliminate some coupling items which are difficult to deal with. Secondly, the adaptive observer is designed to estimate the unknown information of the flexible nonlinear term, and the norm boundary between the observed value and the true value is given. Furthermore, a fault-tolerant controller is designed so that the output of the system is stable in the input state for the estimation of the coupling term. Finally, the simulation results show the effectiveness of the proposed method.
【作者单位】： 南京航空航天大学自动化学院;
【基金】：国家自然科学基金资助项目(6127317161473143) 中央高校基本科研业务费(NE2014202,NE2015002,NE2015103)
【分类号】：V448.22
本文编号：2396977
[Abstract]:Aiming at the problem of attitude stabilization of flexible underactuated spacecraft, a fault tolerant control method based on adaptive observer is proposed, which makes the angular velocity and attitude of spacecraft converge to a bounded region. The flexible spacecraft under consideration is almost axisymmetric, in which the small parameter 蔚 gives the degree of asymmetry of the spacecraft with respect to the underdrive axis. Firstly, the idea of homogeneous system is used to simplify the model of the system and eliminate some coupling items which are difficult to deal with. Secondly, the adaptive observer is designed to estimate the unknown information of the flexible nonlinear term, and the norm boundary between the observed value and the true value is given. Furthermore, a fault-tolerant controller is designed so that the output of the system is stable in the input state for the estimation of the coupling term. Finally, the simulation results show the effectiveness of the proposed method.
【作者单位】： 南京航空航天大学自动化学院;
【基金】：国家自然科学基金资助项目(6127317161473143) 中央高校基本科研业务费(NE2014202,NE2015002,NE2015103)
【分类号】：V448.22
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