TY - JOUR ID - 566 TI - A Robust Adaptive Observer-Based Time Varying Fault Estimation JO - AUT Journal of Modeling and Simulation JA - MISCJ LA - en SN - 2588-2953 AU - Sami Shaker, Montadher AD - Dept. of Electrical Engineering, University of Technology, Baghdad, Iraq Y1 - 2015 PY - 2015 VL - 47 IS - 2 SP - 11 EP - 19 KW - fault estimation KW - Fault diagnosis KW - adaptive observer KW - robust observer design KW - fast fault estimation DO - 10.22060/miscj.2015.566 N2 - This paper presents a new observer design methodology for a time varying actuator fault estimation. A new linear matrix inequality (LMI) design algorithm is developed to tackle the limitations (e.g. equality constraint and robustness problems) of the well known so called fast adaptive fault estimation observer (FAFE). The FAFE is capable of estimating a wide range of time-varying actuator fault signals via augmenting the Luenberger-observer by a proportional integral fault estimator feedback. Within this framework, the main contribution of this paper is the proposal of new LMI formulation that incorporates the use of  norm minimization: (a) to obviate the FAFE equality constraint in order to relax the design algorithm, (b) to ensure robustness against external disturbances, (c) to provide additional degrees of freedom to solve the infeasible optimization problem via assigning different proportional and integral fault estimator gains. Finally, a VTOL aircraft simulation example is used to illustrate the effectiveness of the proposed FAFE. UR - https://miscj.aut.ac.ir/article_566.html L1 - https://miscj.aut.ac.ir/article_566_9187cd3f83eeee516e3b07d60786f05c.pdf ER -