Development And Testing Of Control Laws For The Active Aeroelastic Wing Program
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Author | : |
Publisher | : |
Total Pages | : 23 |
Release | : 2005 |
Genre | : |
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Download Development and Testing of Control Laws for the Active Aeroelastic Wing Program Book in PDF, Epub and Kindle
Author | : National Aeronautics and Space Adm Nasa |
Publisher | : Independently Published |
Total Pages | : 30 |
Release | : 2018-09-15 |
Genre | : Science |
ISBN | : 9781723720383 |
Download Development and Testing of Control Laws for the Active Aeroelastic Wing Program Book in PDF, Epub and Kindle
The Active Aeroelastic Wing research program was a joint program between the U.S. Air Force Research Laboratory and NASA established to investigate the characteristics of an aeroelastic wing and the technique of using wing twist for roll control. The flight test program employed the use of an F/A-18 aircraft modified by reducing the wing torsional stiffness and adding a custom research flight control system. The research flight control system was optimized to maximize roll rate using only wing surfaces to twist the wing while simultaneously maintaining design load limits, stability margins, and handling qualities. NASA Dryden Flight Research Center developed control laws using the software design tool called CONDUIT, which employs a multi-objective function optimization to tune selected control system design parameters. Modifications were made to the Active Aeroelastic Wing implementation in this new software design tool to incorporate the NASA Dryden Flight Research Center nonlinear F/A-18 simulation for time history analysis. This paper describes the design process, including how the control law requirements were incorporated into constraints for the optimization of this specific software design tool. Predicted performance is also compared to results from flight.Dibley, Ryan P. and Allen, Michael J. and Clarke, Robert and Gera, Joseph and Hodgkinson, JohnArmstrong Flight Research CenterAEROELASTIC RESEARCH WINGS; AEROELASTICITY; FLIGHT TESTS; NASA PROGRAMS; F-18 AIRCRAFT; CONTROLLABILITY; LOADS (FORCES); TWISTED WINGS; OPTIMIZATION; DEFLECTION; COMPUTERIZED SIMULATION; ROLL; NONLINEARITY
Author | : Stephen B. Cumming |
Publisher | : BiblioGov |
Total Pages | : 54 |
Release | : 2013-07 |
Genre | : |
ISBN | : 9781289239800 |
Download Active Aeroelastic Wing Aerodynamic Model Development and Validation for a Modified F/a-18a Airplane Book in PDF, Epub and Kindle
A new aerodynamic model has been developed and validated for a modified F/A-18A airplane used for the Active Aeroelastic Wing (AAW) research program. The goal of the program was to demonstrate the advantages of using the inherent flexibility of an aircraft to enhance its performance. The research airplane was an F/A-18A with wings modified to reduce stiffness and a new control system to increase control authority. There have been two flight phases. Data gathered from the first flight phase were used to create the new aerodynamic model. A maximum-likelihood output-error parameter estimation technique was used to obtain stability and control derivatives. The derivatives were incorporated into the National Aeronautics and Space Administration F-18 simulation, validated, and used to develop new AAW control laws. The second phase of flights was used to evaluate the handling qualities of the AAW airplane and the control law design process, and to further test the accuracy of the new model. The flight test envelope covered Mach numbers between 0.85 and 1.30 and dynamic pressures from 600 to 1250 pound-force per square foot. The results presented in this report demonstrate that a thorough parameter identification analysis can be used to improve upon models that were developed using other means. This report describes the parameter estimation technique used, details the validation techniques, discusses differences between previously existing F/A-18 models, and presents results from the second phase of research flights.
Author | : National Aeronautics and Space Administration (NASA) |
Publisher | : Createspace Independent Publishing Platform |
Total Pages | : 50 |
Release | : 2018-05-29 |
Genre | : |
ISBN | : 9781720369455 |
Download Active Aeroelastic Wing Aerodynamic Model Development and Validation for a Modified F/A-18a Airplane Book in PDF, Epub and Kindle
A new aerodynamic model has been developed and validated for a modified F/A-18A airplane used for the Active Aeroelastic Wing (AAW) research program. The goal of the program was to demonstrate the advantages of using the inherent flexibility of an aircraft to enhance its performance. The research airplane was an F/A-18A with wings modified to reduce stiffness and a new control system to increase control authority. There have been two flight phases. Data gathered from the first flight phase were used to create the new aerodynamic model. A maximum-likelihood output-error parameter estimation technique was used to obtain stability and control derivatives. The derivatives were incorporated into the National Aeronautics and Space Administration F-18 simulation, validated, and used to develop new AAW control laws. The second phase of flights was used to evaluate the handling qualities of the AAW airplane and the control law design process, and to further test the accuracy of the new model. The flight test envelope covered Mach numbers between 0.85 and 1.30 and dynamic pressures from 600 to 1250 pound-force per square foot. The results presented in this report demonstrate that a thorough parameter identification analysis can be used to improve upon models that were developed using other means. This report describes the parameter estimation technique used, details the validation techniques, discusses differences between previously existing F/A-18 models, and presents results from the second phase of research flights.Cumming, Stephen B. and Diebler, Corey G.Armstrong Flight Research Center; Kennedy Space CenterF-18 AIRCRAFT; AEROELASTIC RESEARCH WINGS; FLIGHT TESTS; AIRCRAFT MODELS; LEADING EDGE FLAPS; CONTROL SURFACES; DEFLECTION; AIRCRAFT MANEUVERS; SIMULATION; PARAMETER IDENTIFICATION; MAXIMUM LIKELIHOOD ESTIMATES; MACH NUMBER
Author | : Javad Mohammadpour |
Publisher | : Springer Science & Business Media |
Total Pages | : 554 |
Release | : 2012-03-09 |
Genre | : Technology & Engineering |
ISBN | : 1461418321 |
Download Control of Linear Parameter Varying Systems with Applications Book in PDF, Epub and Kindle
Control of Linear Parameter Varying Systems compiles state-of-the-art contributions on novel analytical and computational methods for addressing system identification, model reduction, performance analysis and feedback control design and addresses address theoretical developments, novel computational approaches and illustrative applications to various fields. Part I discusses modeling and system identification of linear parameter varying systems, Part II covers the importance of analysis and control design when working with linear parameter varying systems (LPVS) , Finally, Part III presents an applications based approach to linear parameter varying systems, including modeling of a turbocharged diesel engines, Multivariable control of wind turbines, modeling and control of aircraft engines, control of an autonomous underwater vehicles and analysis and synthesis of re-entry vehicles.
Author | : |
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Total Pages | : 642 |
Release | : 2003 |
Genre | : Armed Forces |
ISBN | : |
Download Signal Book in PDF, Epub and Kindle
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Total Pages | : 18 |
Release | : 1992 |
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Download A Summary of the Active Flexible Wing Program Book in PDF, Epub and Kindle
Author | : |
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Total Pages | : 770 |
Release | : 1977 |
Genre | : Astronautics |
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Download NASA Reference Publication Book in PDF, Epub and Kindle
Author | : Timothy R. Moes |
Publisher | : |
Total Pages | : 146 |
Release | : 2000 |
Genre | : Airplanes |
ISBN | : |
Download Results From F-18B Stability and Control Parameter Estimation Flight Tests at High Dynamic Pressures Book in PDF, Epub and Kindle
Author | : |
Publisher | : |
Total Pages | : 712 |
Release | : 2005 |
Genre | : Aeronautics |
ISBN | : |
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