Robust detection of faulty actuators via unknown input observers

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Abstract
A robust detection scheme for detecting and identifying faulty actuators via unknown input observers is proposed. In this scheme, the uncertainties and some inputs are regarded as unknown inputs. A bank of unknown input observers are thus constructed, each of which is driven by all inputs but one. The residuals of these observers arc used lo construct the detection and identification logic. Simulations based on a non-linear chemical reactor with heat exchanger illustrate the validity of the proposed method. Moreover, a component failure detection scheme via an unknown input observer is also proposed.

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