Fault Estimation and Fault-Tolerant Control for Networked Control Systems with Packet Dropouts

In this work, the fault estimation and fault-tolerant control problems are considered for a networked control systems with external disturbances and packet dropouts. Based on output measurements and state estimates, a intermediate estimator is introduced. A specially-structured error system can be created by decomposing the Laplacian spectrally and scaling the faults and disturbances appropriately. The error system's states are uniformly bounded with an explicit error bound. Compared with the existing results, the proposed fault estimation strategy does not require observers to match and preliminary knowledge of fault upper bounds. Further, the robustness of the error system can be achieved without introducing performance specifications by directly adjusting the parameters of the intermediate estimators. The proposed approaches are finally applied to the longitudinal dynamics of an aircraft model, and the effectiveness is well demonstrated.