Active Fault Diagnosis for Spacecraft Attitude Control Systems Using Set-Theoretic Unknown Input Observers

IF 2.4 Q2 AUTOMATION & CONTROL SYSTEMS
Songtao Wang;Qiang Shen;Huihui Li
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引用次数: 0

Abstract

This letter proposes an active fault diagnosis method for spacecraft attitude control systems with disturbances by utilizing the unknown input observer. Firstly, the spacecraft attitude control system is formulated as a linear time-invariant model under diverse faulty conditions. A general unknown input observer framework is constructed to decouple process disturbances by designing optimal gain matrices, which are analytically obtained by solving an unconstrained optimization problem. Then, zonotopes are utilized to characterize the dynamics of state estimation error, and a set-theoretic unknown input observer is built. To achieve the guaranteed active fault diagnosis, a quadratic program and a mixed-integer quadratic optimization program are formulated to obtain the separating input that can maximize the separation degree of all zonotopes under fault isolation and input saturation constraints. Finally, an illustrative example is provided to verify the effectiveness of the proposed active fault diagnosis method.
基于集合论未知输入观测器的航天器姿态控制系统主动故障诊断
本文提出了一种利用未知输入观测器对具有干扰的航天器姿态控制系统进行主动故障诊断的方法。首先,将航天器姿态控制系统表述为不同故障条件下的线性定常模型。通过设计最优增益矩阵,构造了一个通用的未知输入观测器框架来解耦过程干扰,并通过求解无约束优化问题解析得到增益矩阵。然后,利用带拓扑对状态估计误差的动态特性进行表征,建立了集合论未知输入观测器。为实现有保证的主动故障诊断,在故障隔离和输入饱和约束下,制定了二次规划和混合整数二次优化规划,以获得各分区分离程度最大的分离输入。最后,通过算例验证了所提主动故障诊断方法的有效性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
IEEE Control Systems Letters
IEEE Control Systems Letters Mathematics-Control and Optimization
CiteScore
4.40
自引率
13.30%
发文量
471
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