Enhanced active disturbance rejection control based on compensation function observer for actuator faults in gas generators

To regulate the gas flow in gas generators used in solid ducted rocket ramjets, we propose an enhanced active disturbance rejection control based on a compensation function observer, referred to as CFO-LADRC. We use this observer to improve the estimation of “total disturbance” compared to an extended state observer, and analyze the stability boundaries of the CFO-LADRC based on its transfer function. Furthermore, we extend CFO-LADRC into an active fault-tolerant control framework, enhancing its robustness to actuator faults, and we analyze its stability using Lyapunov-based arguments. Finally, numerical simulations demonstrate the effectiveness of the theoretical results obtained.