Unknown input observer design and its aplication to fault monitoring of flight control systems미지입력관측기의 설계와 비행제어시스템의 고장모니터링에의 응용

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In this paper, the author develops a new design method of a reduced-order unknown input observer(UIO) for estimating states of a system which is subject to unknown inputs. The proposed UIO estimates state and unknown input in parallel. Unknown inputs are modeled to be present in the state and output equation. The major advantage of the proposed method is that the unknown inputs of the state equation and those of the output equation can be handled simultaneously without state augmentation. Also, no a priori knowledge on modes of unknown inputs is required. Since some faults of sensors and actuators can be modeled as additive unknown inputs, the proposed UIO can be used to diagnose a control system. This method is based on a general system model, so it is shown that results of previous studies can be obtained by specializing the proposed method. This paper also deals with the use of output anticipation signals to relax restrictions of existing UIO design methods. The anticipation signals are treated as additional outputs of the original system, and a modified existence condition is presented. The modified condition is shown equal to the condition of system inversion. Numerical examples show that the proposed UIO using the anticipation signals extends the applicability of UIO to a larger class of dynamic systems. There can be the problem that a system designer selects sensors to diagnose a system. In that case, this paper propose a criterion of selecting sensors which give good estimation performance. The proposed criterion is cost functions of robustness problem. Several applications show that this criterion is useful and practical to choose sensors for good estimation performance.
Tahk, Min-Jearesearcher탁민제researcher
한국과학기술원 : 항공우주공학과,
Issue Date
114529/325007 / 000925374

학위논문(박사) - 한국과학기술원 : 항공우주공학과, 1997.2, [ i, 101 p. ]


Modified existence condition; Output anticipation signals; Reduced-order unknown input observer; Condition of system inversion; 센서선택; 시스템 역변환; 존재조건; 축차 미지입력관측기; Criterion of selecting sensors

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