Design method of flight control law considering both transient response and robust stability

Abstract

The invention discloses a flight control law design new method considering both transient response and robust stability. The method comprises the following steps: (1) an aircraft strong non-linear model is built; (2) a force and moment surrogate model is built; (3) an equivalent linear model is built; and (4) in combination with a control inner loop and a control outer loop, a new flight control law is designed. The method of the invention has the beneficial effects that a composite nonlinear feedback control theory and a variable factor technique are used for compromise design and analysis on static and dynamic performance indexes of a closed-loop control system, the flight control system is ensured to have good tracking performance, strong robust stability and satisfactory nonlinear decoupling control ability, the flight control law application range is enhanced, the complicated control quality requirements of the modern aircraft are met, and the mutual restriction problem between dynamic response and robust stability in the flight control system design is solved.

Description

technical field [0001] The invention relates to a method for designing a flight control law, in particular to a method for designing a flight control law that takes both transient response and robust stability into consideration. Background technique [0002] With the development of modern science and technology, the development of advanced aircraft has become a new strategic commanding height in the international high-tech competition. Compared with traditional aircraft, the flight envelope of modern advanced aircraft is wider, the flight altitude is higher, the speed is faster, and the penetration capability is stronger. It can reach the world quickly, increase the payload of the aircraft, and achieve low cost and reusability. It has good cost-effectiveness and huge development prospects in both military and civilian applications, thus attracting the attention of the aerospace and aviation fields of countries all over the world. [0003] Modern advanced aircraft has a lar...

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Problems solved by technology

[0006] However, there is a tradeoff between good system stability and good tracking response performance

[0007] In addition, advanced aircraft also need to consider the configuration of sensors, the limitation of actuator bandwidth, the constraints and margin requirements of system control variables, etc., which lead to the limited capability of the flight control system, especially the fast time-varying Nonlinear unstable systems with more severely limited control

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