Dynamic Decoupling Control of Propeller-Engine Coupling System Based on Disturbance Observer and Feedforward-Feedback

Aiming at the problems of propeller speed response lag, fluctuation, and thrust accuracy reduction caused by the strong bidirectional dynamic coupling effect introduced by the dynamic change of engine power, this paper deeply analyzes the essential impact, establishes an accurate propeller-engine coupling model, and innovatively proposes a feedforward-feedback composite control architecture based on a disturbance observer. The disturbance observer estimates and compensates for disturbances in real-time; the feedforward control quickly responds to commands and known disturbances; the feedback control eliminates steady-state errors and suppresses unknown disturbances. Meanwhile, a dynamic decoupling compensation strategy is introduced to effectively weaken the coupling between engine power and propeller pitch angle, and a multi-objective optimization control strategy is combined to balance various performance indicators. The specially designed decoupling controller, verified by simulation, can significantly suppress the coupling effect and improve the system's control performance (response speed, accuracy, stability) under full working conditions, proving the effectiveness and superiority of the method.