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定量反馈理论(quantitative feedback theory,QFT)是一种频域鲁棒设计方法,定量地将系统结构摄动不确定性和性能设计指标反映到Nichols图上进行分析和设计,从而保证系统在跟踪性和鲁棒性两个方面均能达到设计要求。针对QFT的特点,将QFT方法应用到某型无人机纵向飞行控制律设计中。仿真结果表明,与利用经典控制理论设计的控制律相比,基于QFT的鲁棒控制律在跟踪性能、鲁棒性能和控制效率方面更加优秀,验证了该方法在飞行控制律设计中的有效性。
Quantitative feedback theory (QFT) is a robust method in frequency domain. Quantitatively, the uncertainty of system structure perturbation and performance design indexes are reflected on the Nichols diagram for analysis and design, so as to ensure the system’s tracking ability And robustness can meet the design requirements in both aspects. According to the characteristics of QFT, the QFT method is applied to the design of longitudinal flight control law of a UAV. The simulation results show that the robust control law based on QFT is more excellent in tracking performance, robustness and control efficiency than the control law designed by classical control theory, which verifies the effectiveness of the proposed method in the design of flight control law .