Dynamic inverse-based large-angle-of-attack control method for fighter plane

Abstract

The invention discloses a dynamic inverse-based large-angle-of-attack control method for a fighter plane. For a large-angle-of-attack flying state, a time-scale separation method is adopted, the aircraft state variables are decomposed into two groups of subsystems based on different time scales, and a control law is solved by utilizing a dynamic inverse method respectively. According to the method, a control rudder surface deflection angle is deduced by aiming at the attitude angle speed loop, and the attitude angle speed is deduced by aiming at an airflow angle loop. According to the attitudeangle rate loop bandwidth selection, the influence of coordination control on factors such as side sliding is considered, and a frequency band bandwidth phase and the like are selected. Aiming at anairflow angle loop command model, a winding speed shaft roll angle instruction model is selected as a first-order model for meeting the flight quality requirement of the fighter plane, and an angle ofattack and a side slip angle instruction model are a second-order model. According to the method, the good tracking performance and stability of a flight control system under the large attack angle of the fighter plane are guaranteed, the dangerous states such as deep stall and tail rotation can be timely changed, and the method has good reference significance on practical application of engineering.

Description

technical field [0001] The invention relates to a method for controlling a high angle of attack of a fighter jet based on a dynamic inverse, and belongs to the technical field of advanced aviation control. Background technique [0002] Fighter is a military aircraft used to destroy enemy aircraft and other flying air strike weapons in the air. It is the main type of military air combat and occupies an irreplaceable position in both ground and air combat. In order to obtain the right to dominate the air domain, a large amount of global technology and military forces have been invested in the update and development of fighter jets. Among them, super maneuverability is considered to be an indispensable and important symbolic feature of future high-performance fighter jets, and has received unprecedented attention from various countries and regions. Supermaneuvering refers to the superconventional maneuvering in which the angle of attack exceeds the stall angle of attack and the...

AI Technical Summary

Problems solved by technology

However, the direct application of the dynamic inverse method of state feedback requires a total inversion of the system, and the condition that the number of control variables and state variables must be equal can make the system decompose into multiple linear decoupling subsystems. Difficult to achieve in

[0005] To sum up, the prior art lacks an effective control method for fighter jets at high angles of attack, cannot satisfy the rapidity and stability of fighter jets flying at high angles of attack, and cannot guarantee the improvement of fighter jets after they enter dangerous states such as deep stall and spin. out

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