To provide desired control performance for turbofan engines subject to external disturbances, a nonlinearH∞ set-point control approach is proposed in this paper. The nonlinear H∞ set-point control expands the scopeof controllable operation and limits the impact of disturbances on turbofan engines, which can effectively reducethe frequency of controller switching and improve the stability of the control system. Firstly, a simple polynomialnonlinear state-space model is employed to approximate the nonlinear dynamics of turbofan engines in certainoperating conditions. Then, the nonlinear H∞ set-point controller is designed to ensure the states of turbofan enginesrobust to exogenous disturbances. Finally, it is proven that the proposed controller guarantees asymptotic stabilityand robustness. Simulation results show that the proposed method can improve transient responses, disturbancerejection, surge margins, and fuel consumption for the component level engine model JT9D.
To provide desired control performance for turbofan engines subject to external disturbances, a nonlinearH∞ set-point control approach is proposed in this paper. The nonlinear H∞ set-point control expands the scopeof controllable operation and limits the impact of disturbances on turbofan engines, which can effectively reducethe frequency of controller switching and improve the stability of the control system. Firstly, a simple polynomialnonlinear state-space model is employed to approximate the nonlinear dynamics of turbofan engines in certainoperating conditions. Then, the nonlinear H∞ set-point controller is designed to ensure the states of turbofan enginesrobust to exogenous disturbances. Finally, it is proven that the proposed controller guarantees asymptotic stabilityand robustness. Simulation results show that the proposed method can improve transient responses, disturbancerejection, surge margins, and fuel consumption for the component level engine model JT9D.