Four-element Phase Plane Analysis Equivalent Modeling Method for Three-Dimensional Motion of Aircraft at High Angle of Attack

Abstract

The invention relates to an equivalent model modeling method for four-element phase plane analysis of a large angle of attack three-dimensional motion of an aircraft, which belongs to the field of flight mechanics and control technology and is used to solve the technical problem of poor stability of the analysis model established by the existing modeling method . The established analytical model avoids incorrect approximations such as ignoring the aerodynamic effect in the aerodynamic moment equation. The equivalent second-order differential equations are obtained through the aircraft motion equation and the experimentally obtained aerodynamic force and aerodynamic moment models; through the equations, It can directly apply the phase plane analysis method for theoretical analysis or use the Ode45 module in MATLAB for direct numerical analysis; this model can be used to analyze the situation where the pitch angle is 90 degrees, and more nonlinear phenomena and system instability and unsafety can be found Factors can reduce or even avoid problems such as instability and unsafe flight caused by the analysis model.

Description

Four-element Phase Plane Analysis Equivalent Modeling Method for Three-Dimensional Motion of Aircraft at High Angle of Attack technical field The present invention relates to a kind of aircraft high angle of attack three-dimensional motion phase plane analysis equivalent model modeling method, particularly relate to A four-element phase-plane analysis equivalent model modeling method for three-dimensional motion of aircraft at high angle of attack. 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 facto...

AI Technical Summary

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