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Research On Flight And Control Of The TV Fighter's Post-Stall Maneuvers

Posted on:2004-08-01Degree:MasterType:Thesis
Country:ChinaCandidate:J F HongFull Text:PDF
GTID:2132360095951620Subject:Aircraft flight dynamics and control
Abstract/Summary:PDF Full Text Request
The ability of post-stall maneuver is very important to improve the fighter's ability of air combat and living. And the thrust vectoring technologies is essential to achieve the ability of post-stall. Centred on the thrust vectoring technologies and the post-stall maneuverability, systematic and extensive researches are carried out in this dissertation. On the whole it can be put into two parts, one mainly devoted to the design of thrust vectoring control law, and the other to simulate the post-stall maneuver. The main contents are summarized as follows:1. The aerodynamic characteristics and mechanism of flight dynamics under the condition of post-stall maneuvers are discussed at large in the paper. These questions emerging at high angles of attack, as the aerodynamic -delaying, the asymmetric moment, the low efficiency of the aero-helm, the movement coupling and the inertial coupling etc, are studied at large.2. In connection with the feature of the post-stall maneuver, the nonlinear rigid six-degree-freedom differential equations with three axes of thrust vectoring are set up. To avoid the singular point in solving the equations, the four-element methodology is lead into.3. Towards the normal nonlinear system, the method to get the inversion system using the dynamic inversion theory is introduced in the paper. And using the theory, the fighter high-attack-angle flight control law is designed. Based on the saturated control principle, it makes use of the counterfeit inversion matrix theory to solve the allotment of the helm's popedoms. The results of nonlinear simulation of two post stall maneuvers were presented.4. Basing on the fighter nonlinear model and the high-attack-angle control law, the dynamic characteristics of post-stall maneuver are studied , with the successful simulations of two typical post-stall maneuver - "Cobra" and" Herbst" maneuver . Via the simulations, it is studied the infection of the factor such as fighter's moment characteristic, the control instructions and the initial conditions.
Keywords/Search Tags:thrust vectoring, nonlinear control, dynamic inverse, post-stall maneuver
PDF Full Text Request
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