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The disturbance-observer-based control (DOBC) is a well-known robust control scheme and recently its non-linear version has been developed. Observing that two components (so-called Q-filters) in the conventional DOBC structure have the same transfer function, the authors propose a reduced-order DOBC for uncertain non-linear systems. It is shown that the proposed controller also guarantees the same...
We formulate and study the problem of designing nonlinear observers whose error dynamics are input-to-state stable (ISS) with respect to additive output disturbances as long as the plant's input and state remain bounded. We present a reduced-order observer design which achieves this quasi-ISS property when there exists a suitable state-independent error Lyapunov function. We show that our construction...
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