Active fault tolerant control of turbofan engines with actuator faults under disturbances

Abstract

In this paper, an active fault-tolerant control (FTC) scheme for turbofan engines subject to simultaneous multiplicative and additive actuator faults under disturbances is proposed. First, a state error feedback controller is designed based on interval observer as the nominal controller in order to achieve the model reference rotary speed tracking control for the fault-free turbofan engine under disturbances. Subsequently, a virtual actuator based reconfiguration block is developed aiming at preserving the consistent performance in spite of the occurrence of the simultaneous multiplicative and additive actuator faults. Moreover, to improve the performance of the FTC system, the interval observer is slightly modified without reconstruction of the state error feedback controller. And a theoretical sufficiency criterion is provided to ensure the stability of the proposed active FTC system. Simulation results on a turbofan engine indicate that the proposed active FCT scheme is effective despite of the existence of actuator faults and disturbances.

Dynamic event-triggered-based anti-disturbance control for uncertain LPV systems

“…Remark 2. 𝑑 1 (𝑡) is an additional disturbance that results from uncertainties and perturbations in the exogenous system. Many kinds of disturbances in practical processes can be described by this model, such as unknown constant load 10 , harmonics with unknown phase and magnitude 11 , periodic disturbances in vibrating structures with eccentricity 12 .…”

Dynamic event‐triggered‐based anti‐disturbance control for uncertain LPV systems

“…Remark $$$ {d}_1(t) $$$ is an additional disturbance that results from uncertainties and perturbations in the exogenous system. Many kinds of disturbances in practical processes can be described by this model, such as unknown constant load, 10 harmonics with unknown phase and magnitude, 11 periodic disturbances in vibrating structures with eccentricity 12 …”

“…Among which, the unavailable modeled disturbances are very complex but usually occur in the practical control systems 9 . Such as unknown constant load, 10 harmonics with unknown phase and magnitude, 11 periodic disturbances in vibrating structures with eccentricity 12 . Such disturbances often impose negative influences on the control systems and degrade the anticipated system performance 13 .…”