Time-varying Threshold Design for Intermittent Fault Detection of Dynamic Systems with Luenberger Observer☆

This paper is concerned with time-varying threshold design problem for timely and false-free Luenberger observer-based fault detection for dynamic systems subject to intermittent fault. A new time-varying threshold is proposed with considerations of external disturbance and system uncertainty, by considering threshold supremum, metastable threshold, decaying coefficient and time intervals repartition. Detailed analysis of convergence and detectability is given in the sense of Lyapunov theorem. A simulation example is given to demonstrate the effectiveness of theoretical findings.