Reconfigurable control of linear systems based on state feedback adaptive virtual actuator

Abstract

In this paper, design and development of fault tolerant control (FTC) of linear systems subject to loss of effectiveness and time-varying additive actuator faults as well as an external disturbance using the fault-hiding approach is investigated. The main idea of this approach is to keep the nominal controller and to design a virtual actuator that is inserted between the faulty plant and the nominal controller in order to hide actuator faults from the nominal controller while no information about the nominal controller is needed and consequently the performance of the system before and after the occurrence of actuator faults are kept to be the same. The proposed state feedback adaptive virtual actuator does not require a separate fault detection, isolation and identification (FDII) unit. An illustrative example is given to demonstrate the effectiveness of the proposed adaptive virtual actuator.