A New Criterion of Fault Estimation for Neutral Delay Systems Using Adaptive Observer

Sampled-Data Fault Detection Observer Design of Takagi-Sugeno Fuzzy Systems

“…대표적인 연구 성 과로는 모델 기반의 해석적 중복(analytic redundancy) 기 법이 있다 [1][2][3][4][5][6][7][8][9][10]. 해석적 중복 기법은 관측기로부터 추정 된 시스템의 상태 오차에 적절한 가중치를 두어 여분 (residual)을 계산하고 여분 평가 함수와 주어진 문턱 값을 비교하여 고장 여부를 판단하는 방법이다 [1,2] …”

Observer-based robust fault diagnosis for a class of uncertain nonlinear systems

“…Under the Assumption 1 the adaptive observer can be constructed as follows: In the adaptive observer ( ) t F is updated on line by an adaptive updating law. If ( ) t F is updated according to the updating law proposed in the existing literatures [6][7][8], the adaptive observer could not be realized unless another…”

“…Increasing the reliability of the flight control systems has become a problem which must be solved in the control field. Fault diagnosis (FD), which is an effective way to increase the reliability of the complex processes, has been widely investigated and many research fruits [1][2][3][4][5][6][7][8][9] have been obtained in the past several decades. Among the various FD methods, the observer-based FD technique is the one that has been developed most extensively.…”

“…The fault estimation error should be uniformly ultimately bounded. In recent years many research results on the robust fault diagnosis have been achieved based on the adaptive technique [5][6][7][8][9] including adaptive observer and adaptive neural network observer. However, so far there are still some practical problems not to be solved, for example, the parameters of the neural network are still difficult to be chosen due to lacking scientific basis; the assumption conditions of the adaptive observer are very difficult to be satisfied in the engineering practice.…”

ℋ_/ℋ∞Fault Detection and Isolation for Discrete-Time Delayed Systems

“…특히 모델 기반의 고장검출 기법은 기존의 잘 개발된 관측 기 설계 이론을 고장검출 문제에 적용할 수 있다는 장점이 있어 널리 사용된다 [6][7][8][9]. 모델 기반 기법에서 관측기는 추정 된 오차로부터 잔여오차(residual)를 생성하고 고장 여부는 고 장 판단 논리(fault decision logic)에 의해 결정된다 [10].…”