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针对具有非线性特性和输入饱和约束的大型客机着陆模型,引入了组合非线性反馈控制算法。该算法由一项线性反馈控制律和一项非线性反馈控制律共同作用而成,可以有效解决激励饱和约束的控制问题。首先介绍了该算法的设计原理与稳定性证明;然后运用该算法设计了Boeing747飞机自动着陆纵向控制律,设计中秉承“线性系统设计,非线性系统验证”的工程实践常用思路;最后通过MATLAB数值仿真以及Flight Gear视景仿真,验证了设计的控制系统具有很好的鲁棒稳定性和精确跟踪能力。
Aiming at large aircraft landing model with non-linearity and input saturation constraints, a combined nonlinear feedback control algorithm is introduced. The algorithm consists of a linear feedback control law and a nonlinear feedback control law, which can effectively solve the control problem of the saturation constraint. Firstly, the design principle and stability proof of this algorithm are introduced. Then, the algorithm is used to design the longitudinal control law of Boeing747 aircraft automatic landing. The design adopts the common engineering practice of “linear system design and nonlinear system verification”. Finally, MATLAB numerical simulation and Flight Gear visual simulation show that the designed control system has good robustness and precise tracking ability.