基于参考调节器的容错约束控制
Reference Governor-Based Fault-Tolerant Constrained Control
摘要:
本文提出了一种约束线性系的容错控制方案。首先,介绍了一种新的参考调速器(RG)变体,称为一次参考调速器(AORG)。AORG通过计算辅助参考(AR)序列而与常规RG区分开,以便在规定的时间间隔内而不是仅在当前时刻优化性能;这使得AORG与故障检测方案的集成成为可能。特别是,它表明,当AORG与多模型自适应估计(MMAE)相结合时,可以确定AR序列,使得跟踪特性得到保证,并且始终满足约束条件,同时优化检测性能,即,可以以高的正确性概率检测故障。此外,提出了一种重构方案,确保系统的生存能力,尽管存在故障的基础上可恢复集。在一架波音747-100飞机模型上进行了仿真,以评估AORG方案在执行约束和跟踪期望的滚转角和侧滑角方面的有效性。所提出的容错控制方案在保持飞机的生存能力,在存在损坏的垂直安定面的有效性也被证明。
英文摘要:
This paper presents a fault-tolerant control scheme for constrained linear systems. First, a new variant of the Reference Governor (RG) called At Once Reference Governor (AORG) is introduced. The AORG is distinguished from the conventional RG by computing the Auxiliary Reference (AR) sequence so that to optimize performance over a prescribed time interval instead of only at the current time instant; this enables the integration of the AORG with fault detection schemes. In particular, it is shown that, when the AORG is combined with a Multi-Model Adaptive Estimator (MMAE), the AR sequence can be determined such that the tracking properties are guaranteed and constraints are satisfied at all times, while the detection performance is optimized, i.e., faults can be detected with a high probability of correctness. In addition a reconfiguration scheme is presented that ensures system viability despite the presence of faults based on recoverable sets. Simulations on a Boeing 747-100 aircraft model are carried out to evaluate the effectiveness of the AORG scheme in enforcing constraints and tracking the desired roll and side-slip angles. The effectiveness of the presented fault-tolerant control scheme in maintaining the airplane viability in the presence of damaged vertical stabilizer is also demonstrated.
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