Longitudinal Control Design Approach For High Angle Of Attack Aircraft PDF Download
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Author | : Aaron J. Ostroff |
Publisher | : |
Total Pages | : 36 |
Release | : 1993 |
Genre | : Airplanes |
ISBN | : |
Download Longitudinal-control Design Approach for High-angle-of-attack Aircraft Book in PDF, ePub and Kindle
Author | : National Aeronautics and Space Adm Nasa |
Publisher | : |
Total Pages | : 36 |
Release | : 2018-10-20 |
Genre | : |
ISBN | : 9781729008287 |
Download Longitudinal-Control Design Approach for High-Angle-Of-Attack Aircraft Book in PDF, ePub and Kindle
This paper describes a control synthesis methodology that emphasizes a variable-gain output feedback technique that is applied to the longitudinal channel of a high-angle-of-attack aircraft. The aircraft is a modified F/A-18 aircraft with thrust-vectored controls. The flight regime covers a range up to a Mach number of 0.7; an altitude range from 15,000 to 35,000 ft; and an angle-of-attack (alpha) range up to 70 deg, which is deep into the poststall region. A brief overview is given of the variable-gain mathematical formulation as well as a description of the discrete control structure used for the feedback controller. This paper also presents an approximate design procedure with relationships for the optimal weights for the selected feedback control structure. These weights are selected to meet control design guidelines for high-alpha flight controls. Those guidelines that apply to the longitudinal-control design are also summarized. A unique approach is presented for the feed-forward command generator to obtain smooth transitions between load factor and alpha commands. Finally, representative linear analysis results and nonlinear batch simulation results are provided. Ostroff, Aaron J. and Proffitt, Melissa S. Langley Research Center RTOP 505-64-30-01...
Author | : |
Publisher | : |
Total Pages | : 244 |
Release | : 1991 |
Genre | : |
ISBN | : |
Download Development of High Angle of Attack Control Laws for an Unstable, Non- Minimum Phase Aircraft Using Variations of the Quantitative Feedback Technique Book in PDF, ePub and Kindle
This thesis discusses the application of variations of the quantitative feedback technique to a control problem with unstable, non-minimum phase plants. The X-29A research aircraft is used as the basis for developing a set of representative linearized aircraft dynamics models, which are modified to allow for the use of differential canard control inputs for enhanced maneuverability at extreme angles of attack. A specialized design approach is presented to develop frequency dependent weighting matrices, and the shortcomings of traditional methods are discussed. Four independent longitudinal compensators are developed by first designing loop transmission functions. Discussion is provided that addresses the limitations imposed on the designer by the numerous right half plane poles and zeros of the effective plants. The optimal blending method is applied in one case to achieve a marginally stable system for a virtually impossible problem. Prefilters are designed and their effects on closed-loop time responses are discussed. The singular-G method is used to improve the achievable stability characterisitics of a multi-input multi-output lateral-directional controller. The optimal blending method is then applied to develop an optimal loop transmission function. Finally, the required steps for completing the MIMO design are presented to aid future research efforts.
Author | : Robert C. Nelson |
Publisher | : WCB/McGraw-Hill |
Total Pages | : 441 |
Release | : 1998 |
Genre | : Aerodynamique / Aeronautique / Aerospatial / Automatique / Avion / Commande / Conception / Controle / Navigation / Stabilite |
ISBN | : 9780071158381 |
Download Flight Stability and Automatic Control Book in PDF, ePub and Kindle
The second edition of Flight Stability and Automatic Control presents an organized introduction to the useful and relevant topics necessary for a flight stability and controls course. Not only is this text presented at the appropriate mathematical level, it also features standard terminology and nomenclature, along with expanded coverage of classical control theory, autopilot designs, and modern control theory. Through the use of extensive examples, problems, and historical notes, author Robert Nelson develops a concise and vital text for aircraft flight stability and control or flight dynamics courses.
Author | : John B. Davidson |
Publisher | : |
Total Pages | : 74 |
Release | : 1998 |
Genre | : Airplanes |
ISBN | : |
Download High-Alpha Research Vehicle Lateral-Directional Control Law Description, Analyses, and Simulation Results Book in PDF, ePub and Kindle
Author | : |
Publisher | : |
Total Pages | : |
Release | : 1978 |
Genre | : |
ISBN | : |
Download Finnish Americana Book in PDF, ePub and Kindle
Author | : John T. Bosworth |
Publisher | : |
Total Pages | : 120 |
Release | : 1992 |
Genre | : Aerodynamics |
ISBN | : |
Download Linearized Aerodynamic and Control Law Models of the X-29A Airplane and Comparison with Flight Data Book in PDF, ePub and Kindle
Author | : National Aeronautics and Space Administration (NASA) |
Publisher | : Createspace Independent Publishing Platform |
Total Pages | : 42 |
Release | : 2018-07-03 |
Genre | : |
ISBN | : 9781722234089 |
Download Feedback Control Laws for Highly Maneuverable Aircraft Book in PDF, ePub and Kindle
The results of a study of the application of H infinity and mu synthesis techniques to the design of feedback control laws for the longitudinal dynamics of the High Angle of Attack Research Vehicle (HARV) are presented. The objective of this study is to develop methods for the design of feedback control laws which cause the closed loop longitudinal dynamics of the HARV to meet handling quality specifications over the entire flight envelope. Control law designs are based on models of the HARV linearized at various flight conditions. The control laws are evaluated by both linear and nonlinear simulations of typical maneuvers. The fixed gain control laws resulting from both the H infinity and mu synthesis techniques result in excellent performance even when the aircraft performs maneuvers in which the system states vary significantly from their equilibrium design values. Both the H infinity and mu synthesis control laws result in performance which compares favorably with an existing baseline longitudinal control law. Garrard, William L. and Balas, Gary J. Unspecified Center NAG1-1380...
Author | : Paul James Lynch |
Publisher | : |
Total Pages | : 300 |
Release | : 1985 |
Genre | : |
ISBN | : |
Download Design of Longitudinal Control Functions for a Next Generation Ground Attack Aircraft Book in PDF, ePub and Kindle
Author | : Aaron J. Ostroff |
Publisher | : |
Total Pages | : 28 |
Release | : 1994 |
Genre | : Feedback control systems |
ISBN | : |
Download Design and Evaluation of a Stochastic Optimal Feed-forward and Feedback Technology (SOFFT) Flight Control Architecture Book in PDF, ePub and Kindle