基于未知输入观测器的涡扇发动机直接推力控制

针对某型涡扇发动机,进行直接推力控制回路设计方法研究.基于未知输入观测器(UIO)原理建立了涡扇发动机机载模型和推力估计器,UIO通过解耦外界干扰实现了全飞行包线推力的准确估计;提出了直接推力闭环反馈控制的双回路结构设计方案,内环转速控制,外环推力控制,有利于实现各回路控制参数的独立设计.仿真验证结果表明:基于UIO的模型基涡扇发动机直接推力控制具有良好的控制稳定性和抗干扰性能,对于发动机不同工作点直接推力控制,推力控制误差不超过0.1%,转速控制偏差不超过0.2%. 

Direct thrust control of turbofan engines based on unknown input observer

A research on direct thrust control loop design method of a turbofan engine was carried out. Firstly, an onboard model and a thrust estimator of turbofan engines were built based on unknown input observer(UIO) design. Accurate estimation of the entire flight envelope thrust was achieved through decoupling the external disturbance by the UIO observer. Secondly, an integrated dual-loop direct thrust control scheme was proposed. Respectively, its inner loop control was achieved through rotor speed close-loop control scheme, and its outer loop control through engine thrust close-loop control scheme. It is beneficial to realize the independent design of control parameters for each loop. At the end, disturbance rejection and servo tracking ability of the proposed control scheme was successfully validated by simulation. For the engine of different flight working condition points of the direct thrust control, the thrust control error is not more than 0.1%, the speed control deviation is not more than 0.2%.