An Equivalent Model Modeling Method for Aircraft Longitudinal High Angle of Attack Motion Phase Plane Analysis

Abstract

The invention relates to an equivalent model modeling method for an aircraft's longitudinal large angle-of-attack motion phase plane analysis, which belongs to the technical field of flight mechanics and control, and is used to solve the technical problem of poor stability of the analysis model established by the existing modeling method. The established model avoids ignoring the aerodynamic action in the aerodynamic torque equation, such as incorrect approximation, and obtains the equivalent second-order differential equation through the aircraft motion equation and the aerodynamic and aerodynamic torque models obtained from the test; through this equation, it can be directly applied The phase plane analysis method is used for theoretical analysis or the Ode45 module in MATLAB is used for direct numerical analysis; using this model, more nonlinear phenomena can be found, and problems such as instability and unsafe flight caused by the analysis model can be reduced or even avoided.

Description

Aircraft Longitudinal High Angle of Attack Motion Phase Plane Analysis Equivalent Model Modeling Method Technical Field The present invention relates to a kind of aircraft phase plane analysis equivalent model modeling method, particularly relate to aircraft longitudinal Angular Motion Phase Plane Analysis Equivalent Modeling Method. Background technique Aircraft high angle of attack flight is the important symbol of modern and future high-performance aircraft. Use your own position at high angle of attack The pilot can flexibly maneuver the aircraft to roll around the speed axis and make the nose point to any direction quickly. To gain a pointing advantage to attack the enemy, you can also evade the enemy's attack and quickly turn to counterattack to improve your own survivability. force. Therefore, post-stall maneuverability is one of the key factors to gain superiority in air combat, and it is also the key factor for modern and future advanced fighter jets. One ...

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Problems solved by technology

Summary of the invention In order to overcome the deficiencies in the poor stability of the analytical model established by the existing modeling method, the invention provides a kind of flying

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