Flight Test Of The F A 18 Active Aeroelastic Wing Airplane PDF Download
Are you looking for read ebook online? Search for your book and save it on your Kindle device, PC, phones or tablets. Download Flight Test Of The F A 18 Active Aeroelastic Wing Airplane PDF full book. Access full book title Flight Test Of The F A 18 Active Aeroelastic Wing Airplane.
| Author | : National Aeronautics and Space Adm Nasa |
| Publisher | : Independently Published |
| Total Pages | : 44 |
| Release | : 2018-09-19 |
| Genre | : Science |
| ISBN | : 9781723841774 |
Download Flight Test of the F/A-18 Active Aeroelastic Wing Airplane Book in PDF, ePub and Kindle
Successful flight-testing of the Active Aeroelastic Wing airplane was completed in March 2005. This program, which started in 1996, was a joint activity sponsored by NASA, Air Force Research Laboratory, and industry contractors. The test program contained two flight test phases conducted in early 2003 and early 2005. During the first phase of flight test, aerodynamic models and load models of the wing control surfaces and wing structure were developed. Design teams built new research control laws for the Active Aeroelastic Wing airplane using these flight-validated models; and throughout the final phase of flight test, these new control laws were demonstrated. The control laws were designed to optimize strategies for moving the wing control surfaces to maximize roll rates in the transonic and supersonic flight regimes. Control surface hinge moments and wing loads were constrained to remain within hydraulic and load limits. This paper describes briefly the flight control system architecture as well as the design approach used by Active Aeroelastic Wing project engineers to develop flight control system gains. Additionally, this paper presents flight test techniques and comparison between flight test results and predictions.Clarke, Robert and Allen, Michael J. and Dibley, Ryan P. and Gera, Joseph and Hodgkinson, JohnArmstrong Flight Research CenterAEROELASTICITY; FLIGHT CONTROL; FLIGHT TESTS; AEROELASTIC RESEARCH WINGS; AIRCRAFT CONTROL; FLIGHT CHARACTERISTICS; AIRCRAFT DESIGN; AERODYNAMIC CHARACTERISTICS; WING OSCILLATIONS
| Author | : Robert Clarke |
| Publisher | : BiblioGov |
| Total Pages | : 34 |
| Release | : 2013-08 |
| Genre | : |
| ISBN | : 9781289284404 |
Download Flight Test of the F/a-18 Active Aeroelastic Wing Airplane Book in PDF, ePub and Kindle
Successful flight-testing of the Active Aeroelastic Wing airplane was completed in March 2005. This program, which started in 1996, was a joint activity sponsored by NASA, Air Force Research Laboratory, and industry contractors. The test program contained two flight test phases conducted in early 2003 and early 2005. During the first phase of flight test, aerodynamic models and load models of the wing control surfaces and wing structure were developed. Design teams built new research control laws for the Active Aeroelastic Wing airplane using these flight-validated models; and throughout the final phase of flight test, these new control laws were demonstrated. The control laws were designed to optimize strategies for moving the wing control surfaces to maximize roll rates in the transonic and supersonic flight regimes. Control surface hinge moments and wing loads were constrained to remain within hydraulic and load limits. This paper describes briefly the flight control system architecture as well as the design approach used by Active Aeroelastic Wing project engineers to develop flight control system gains. Additionally, this paper presents flight test techniques and comparison between flight test results and predictions.
| Author | : |
| Publisher | : |
| Total Pages | : 20 |
| Release | : 2002 |
| Genre | : Airplanes |
| ISBN | : |
Download Strain Gage Loads Calibration Testing of the Active Aeroelastic Wing F/A-18 Aircraft Book in PDF, ePub and Kindle
This report describes strain-gage calibration loading through the application of known loads of the Active Aeroelastic Wing F/A-18 airplane. The primary goal of this test is to produce a database suitable for deriving load equations for left and right wing root and fold shear; bending moment; torque; and all eight wing control-surface hinge moments. A secondary goal is to produce a database of wing deflections mesured by string potentiometers and the onboard flight deflection measurement system. Another goal is to produce strain-gage data through both the laboratory data acquisition system and the onboard aircraft data system as a check of the aircraft system. Thirty-two hydraulic jacks have applied loads through whiffletrees to 104 tension-compression load pads bonded to the lower wing surfaces. The load pads covered approximately 60 percent of the lower wing surface.
| Author | : Fouad Sabry |
| Publisher | : One Billion Knowledgeable |
| Total Pages | : 341 |
| Release | : 2022-10-25 |
| Genre | : Transportation |
| ISBN | : |
Download Active Aeroelastic Wing Book in PDF, ePub and Kindle
What Is Active Aeroelastic Wing The X-53 Active Aeroelastic Wing (AAW) development program is an American research project that has been completed. This project was carried out jointly by the Air Force Research Laboratory (AFRL), Boeing Phantom Works, and NASA's Dryden Flight Research Center. At NASA's Dryden Flight Research Center, the technology was flight tested on a modified McDonnell Douglas F/A-18 Hornet. Active Aeroelastic Wing Technology is a technology that blends the aerodynamics, controls, and structure of a wing in order to harness and regulate the aeroelastic twist that a wing experiences under dynamic stresses and high speeds. The use of multiple leading and trailing edge controls, such as "aerodynamic tabs," enables subtle amounts of aeroelastic twist to be controlled to provide large amounts of wing control power, while simultaneously minimizing maneuver air loads under high wing strain conditions or aerodynamic drag under low wing strain conditions. This is accomplished while maintaining a balance between the two extremes of wing strain conditions. This operation served as the very first demonstration of AAW technology on a large scale. How You Will Benefit (I) Insights, and validations about the following topics: Chapter 1: Active Aeroelastic Wing Chapter 2: Aileron Chapter 3: Aeroelasticity Chapter 4: Elevon Chapter 5: NASA X-43 Chapter 6: List of experimental aircraft Chapter 7: Boeing X-45 Chapter 8: Grumman X-29 Chapter 9: Air Force Research Laboratory Chapter 10: Boeing X-48 Chapter 11: Elevator (aeronautics) Chapter 12: Flap (aeronautics) Chapter 13: United States Air Force Stability and Control Digital DATCOM Chapter 14: Leading-edge cuff Chapter 15: Flaperon Chapter 16: Spoileron Chapter 17: McDonnell Douglas F-15 STOL/MTD Chapter 18: Boeing X-51 Waverider Chapter 19: Adaptive compliant wing Chapter 20: Leading-edge slat Chapter 21: General Dynamics-Boeing AFTI/F-111A Aardvark (II) Answering the public top questions about boeing x53 active aeroelastic wing. (III) Real world examples for the usage of boeing x53 active aeroelastic wing in many fields. (IV) 17 appendices to explain, briefly, 266 emerging technologies in each industry to have 360-degree full understanding of boeing x53 active aeroelastic wing' technologies. Who This Book Is For Professionals, undergraduate and graduate students, enthusiasts, hobbyists, and those who want to go beyond basic knowledge or information for any kind of boeing x53 active aeroelastic wing.
| 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 | : 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 | : William A. Lokos |
| Publisher | : |
| Total Pages | : 9 |
| Release | : 2002 |
| Genre | : Aeroelasticity |
| ISBN | : |
Download Wing Torsional Stiffness Tests of the Active Aeroelastic Wing F/A-18 Airplane Book in PDF, ePub and Kindle
The left wing of the Active Aeroelastic Wing (AAW) F/A-18 airplane has been ground-load-tested to quantify its torsional stiffness. The test has been performed at the NASA Dryden Flight Research Center in November 1996 and again in April 2001 after a wing skin modification was performed. The primary objectives of these tests were to characterize the wing behavior before the first flight, and provide a before-and-after measurement of the torsional stiffness. Two streamwise load couples have been applied. The wing skin modification is shown to have more torsional flexibility than the original configuration has. Additionally, structural hysteresis is shown to be reduced by the skin modification. Data comparisons show good repeatability between the tests.
| 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 | : National Aeronautics and Space Administration (NASA) |
| Publisher | : Createspace Independent Publishing Platform |
| Total Pages | : 34 |
| Release | : 2018-06-12 |
| Genre | : |
| ISBN | : 9781721033195 |
Download Twist Model Development and Results from the Active Aeroelastic Wing F/a-18 Aircraft Book in PDF, ePub and Kindle
Understanding the wing twist of the active aeroelastic wing F/A-18 aircraft is a fundamental research objective for the program and offers numerous benefits. In order to clearly understand the wing flexibility characteristics, a model was created to predict real-time wing twist. A reliable twist model allows the prediction of twist for flight simulation, provides insight into aircraft performance uncertainties, and assists with computational fluid dynamic and aeroelastic issues. The left wing of the aircraft was heavily instrumented during the first phase of the active aeroelastic wing program allowing deflection data collection. Traditional data processing steps were taken to reduce flight data, and twist predictions were made using linear regression techniques. The model predictions determined a consistent linear relationship between the measured twist and aircraft parameters, such as surface positions and aircraft state variables. Error in the original model was reduced in some cases by using a dynamic pressure-based assumption and by using neural networks. These techniques produced excellent predictions for flight between the standard test points and accounted for nonlinearities in the data. This report discusses data processing techniques and twist prediction validation, and provides illustrative and quantitative results.Lizotte, Andrew and Allen, Michael J.Armstrong Flight Research CenterAEROELASTICITY; WINGS; FLEXIBILITY; FLIGHT SIMULATION; REAL TIME OPERATION; DYNAMIC PRESSURE; FLIGHT TESTS; ERROR ANALYSIS; DATA PROCESSING; DATA ACQUISITION
| Author | : National Aeronautics and Space Administration (NASA) |
| Publisher | : Createspace Independent Publishing Platform |
| Total Pages | : 36 |
| Release | : 2018-06-20 |
| Genre | : |
| ISBN | : 9781721585212 |
Download Aeroservoelastic Model Validation and Test Data Analysis of the F/a-18 Active Aeroelastic Wing Book in PDF, ePub and Kindle
Model validation and flight test data analysis require careful consideration of the effects of uncertainty, noise, and nonlinearity. Uncertainty prevails in the data analysis techniques and results in a composite model uncertainty from unmodeled dynamics, assumptions and mechanics of the estimation procedures, noise, and nonlinearity. A fundamental requirement for reliable and robust model development is an attempt to account for each of these sources of error, in particular, for model validation, robust stability prediction, and flight control system development. This paper is concerned with data processing procedures for uncertainty reduction in model validation for stability estimation and nonlinear identification. F/A-18 Active Aeroelastic Wing (AAW) aircraft data is used to demonstrate signal representation effects on uncertain model development, stability estimation, and nonlinear identification. Data is decomposed using adaptive orthonormal best-basis and wavelet-basis signal decompositions for signal denoising into linear and nonlinear identification algorithms. Nonlinear identification from a wavelet-based Volterra kernel procedure is used to extract nonlinear dynamics from aeroelastic responses, and to assist model development and uncertainty reduction for model validation and stability prediction by removing a class of nonlinearity from the uncertainty. Brenner, Martin J. and Prazenica, Richard J. Armstrong Flight Research Center NASA/TM-2003-212021, H-2526, NAS 1.15:212021
