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Aerodynamic Parameters Of High Angle Of Attack Research Vehicle Harv Estimated From Flight Data
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Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781722163938 Total Pages :70 pages Book Rating :4.1/5 (639 download)
Book Synopsis Aerodynamic Parameters of High-Angle-Of Attack Research Vehicle (Harv) Estimated from Flight Data by : National Aeronautics and Space Administration (NASA)
Download or read book Aerodynamic Parameters of High-Angle-Of Attack Research Vehicle (Harv) Estimated from Flight Data written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-02 with total page 70 pages. Available in PDF, EPUB and Kindle. Book excerpt: Aerodynamic parameters of the High-Angle-of-Attack Research Aircraft (HARV) were estimated from flight data at different values of the angle of attack between 10 degrees and 50 degrees. The main part of the data was obtained from small amplitude longitudinal and lateral maneuvers. A small number of large amplitude maneuvers was also used in the estimation. The measured data were first checked for their compatibility. It was found that the accuracy of air data was degraded by unexplained bias errors. Then, the data were analyzed by a stepwise regression method for obtaining a structure of aerodynamic model equations and least squares parameter estimates. Because of high data collinearity in several maneuvers, some of the longitudinal and all lateral maneuvers were reanalyzed by using two biased estimation techniques, the principal components regression and mixed estimation. The estimated parameters in the form of stability and control derivatives, and aerodynamic coefficients were plotted against the angle of attack and compared with the wind tunnel measurements. The influential parameters are, in general, estimated with acceptable accuracy and most of them are in agreement with wind tunnel results. The simulated responses of the aircraft showed good prediction capabilities of the resulting model. Klein, Vladislav and Ratvasky, Thomas R. and Cobleigh, Brent R. Langley Research Center...
Book Synopsis Aerodynamic Parameters of High-Angle-of Attack Research Vehicle (HARV) Estimated from Flight Data by :
Download or read book Aerodynamic Parameters of High-Angle-of Attack Research Vehicle (HARV) Estimated from Flight Data written by and published by . This book was released on 1990 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Estimation of the Aerodynamic and Thrust Vectoring Parametersfrom Flight Data of the F-18 High Angle of Attack Research Vehicle (HARV) by : Brandon L. Stille
Download or read book Estimation of the Aerodynamic and Thrust Vectoring Parametersfrom Flight Data of the F-18 High Angle of Attack Research Vehicle (HARV) written by Brandon L. Stille and published by . This book was released on 1999 with total page 210 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781722377526 Total Pages :52 pages Book Rating :4.3/5 (775 download)
Book Synopsis Estimation of the Longitudinal and Lateral-Directional Aerodynamic Parameters from Flight Data for the NASA F/A-18 Harv by : National Aeronautics and Space Administration (NASA)
Download or read book Estimation of the Longitudinal and Lateral-Directional Aerodynamic Parameters from Flight Data for the NASA F/A-18 Harv written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-06 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt: This progress report presents the results of an investigation focused on parameter identification for the NASA F/A-18 HARV. This aircraft was used in the high alpha research program at the NASA Dryden Flight Research Center. In this study the longitudinal and lateral-directional stability derivatives are estimated from flight data using the Maximum Likelihood method coupled with a Newton-Raphson minimization technique. The objective is to estimate an aerodynamic model describing the aircraft dynamics over a range of angle of attack from 5 deg to 60 deg. The mathematical model is built using the traditional static and dynamic derivative buildup. Flight data used in this analysis were from a variety of maneuvers. The longitudinal maneuvers included large amplitude multiple doublets, optimal inputs, frequency sweeps, and pilot pitch stick inputs. The lateral-directional maneuvers consisted of large amplitude multiple doublets, optimal inputs and pilot stick and rudder inputs. The parameter estimation code pEst, developed at NASA Dryden, was used in this investigation. Results of the estimation process from alpha = 5 deg to alpha = 60 deg are presented and discussed. Napolitano, Marcello R. Ames Research Center...
Book Synopsis Flight-Determined, Subsonic, Lateral-Directional Stability and Control Derivatives of the Thrust-Vectoring F-18 High Angle of Attack Research Vehicle (HARV), and Comparisons to the Basic F-18 and Predicted Derivatives by : Kenneth W. Iliff
Download or read book Flight-Determined, Subsonic, Lateral-Directional Stability and Control Derivatives of the Thrust-Vectoring F-18 High Angle of Attack Research Vehicle (HARV), and Comparisons to the Basic F-18 and Predicted Derivatives written by Kenneth W. Iliff and published by . This book was released on 1999 with total page 92 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Scientific and Technical Aerospace Reports by :
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 702 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Inclusion of Unsteady Aerodynamics in Longitudinal Parameter Estimation from Flight Data by : M. J. Queijo
Download or read book Inclusion of Unsteady Aerodynamics in Longitudinal Parameter Estimation from Flight Data written by M. J. Queijo and published by . This book was released on 1979 with total page 62 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Flight-Determined Subsonic Longitudinal Stability and Control Derivatives of the F-18 High Angle of Attack Research Vehicle (HARV) with Thrust Vectoring by : Kenneth W. Iliff
Download or read book Flight-Determined Subsonic Longitudinal Stability and Control Derivatives of the F-18 High Angle of Attack Research Vehicle (HARV) with Thrust Vectoring written by Kenneth W. Iliff and published by . This book was released on 1997 with total page 74 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Aerodynamic Parameters of an Advanced Fighter Aircraft Estimated from Flight Data. Preliminary Results by :
Download or read book Aerodynamic Parameters of an Advanced Fighter Aircraft Estimated from Flight Data. Preliminary Results written by and published by . This book was released on 1989 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Estimation of the Longitudinal and Lateral-directional Aerodynamic Parameters from Flight Data for the NASA F/A-18 HARV by : Alfonso C. Paris
Download or read book Estimation of the Longitudinal and Lateral-directional Aerodynamic Parameters from Flight Data for the NASA F/A-18 HARV written by Alfonso C. Paris and published by . This book was released on 1997 with total page 260 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781720525899 Total Pages :90 pages Book Rating :4.5/5 (258 download)
Book Synopsis Flight-Determined, Subsonic, Lateral-Directional Stability and Control Derivatives of the Thrust-Vectoring F-18 High Angle of Attack Research Vehicle (Harv), and Comparisons to the Basic F-18 and Predicted Derivatives by : National Aeronautics and Space Administration (NASA)
Download or read book Flight-Determined, Subsonic, Lateral-Directional Stability and Control Derivatives of the Thrust-Vectoring F-18 High Angle of Attack Research Vehicle (Harv), and Comparisons to the Basic F-18 and Predicted Derivatives written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-05-31 with total page 90 pages. Available in PDF, EPUB and Kindle. Book excerpt: The subsonic, lateral-directional, stability and control derivatives of the thrust-vectoring F-1 8 High Angle of Attack Research Vehicle (HARV) are extracted from flight data using a maximum likelihood parameter identification technique. State noise is accounted for in the identification formulation and is used to model the uncommanded forcing functions caused by unsteady aerodynamics. Preprogrammed maneuvers provided independent control surface inputs, eliminating problems of identifiability related to correlations between the aircraft controls and states. The HARV derivatives are plotted as functions of angles of attack between 10deg and 70deg and compared to flight estimates from the basic F-18 aircraft and to predictions from ground and wind tunnel tests. Unlike maneuvers of the basic F-18 aircraft, the HARV maneuvers were very precise and repeatable, resulting in tightly clustered estimates with small uncertainty levels. Significant differences were found between flight and prediction; however, some of these differences may be attributed to differences in the range of sideslip or input amplitude over which a given derivative was evaluated, and to differences between the HARV external configuration and that of the basic F-18 aircraft, upon which most of the prediction was based. Some HARV derivative fairings have been adjusted using basic F-18 derivatives (with low uncertainties) to help account for differences in variable ranges and the lack of HARV maneuvers at certain angles of attack.Iliff, Kenneth W. and Wang, Kon-Sheng CharlesArmstrong Flight Research CenterF-18 AIRCRAFT; ANGLE OF ATTACK; MAXIMUM LIKELIHOOD ESTIMATES; DIRECTIONAL STABILITY; CONTROL SURFACES; AIRCRAFT CONTROL; WIND TUNNEL TESTS; PARAMETER IDENTIFICATION; LATERAL STABILITY
Author :National Aeronautics and Space Adm Nasa Publisher :Independently Published ISBN 13 :9781723952135 Total Pages :92 pages Book Rating :4.9/5 (521 download)
Book Synopsis Flight-Determined, Subsonic, Lateral-Directional Stability and Control Derivatives of the Thrust-Vectoring F-18 High Angle of Attack Research Vehicle by : National Aeronautics and Space Adm Nasa
Download or read book Flight-Determined, Subsonic, Lateral-Directional Stability and Control Derivatives of the Thrust-Vectoring F-18 High Angle of Attack Research Vehicle written by National Aeronautics and Space Adm Nasa and published by Independently Published. This book was released on 2018-09-23 with total page 92 pages. Available in PDF, EPUB and Kindle. Book excerpt: The subsonic, lateral-directional, stability and control derivatives of the thrust-vectoring F-1 8 High Angle of Attack Research Vehicle (HARV) are extracted from flight data using a maximum likelihood parameter identification technique. State noise is accounted for in the identification formulation and is used to model the uncommanded forcing functions caused by unsteady aerodynamics. Preprogrammed maneuvers provided independent control surface inputs, eliminating problems of identifiability related to correlations between the aircraft controls and states. The HARV derivatives are plotted as functions of angles of attack between 10deg and 70deg and compared to flight estimates from the basic F-18 aircraft and to predictions from ground and wind tunnel tests. Unlike maneuvers of the basic F-18 aircraft, the HARV maneuvers were very precise and repeatable, resulting in tightly clustered estimates with small uncertainty levels. Significant differences were found between flight and prediction; however, some of these differences may be attributed to differences in the range of sideslip or input amplitude over which a given derivative was evaluated, and to differences between the HARV external configuration and that of the basic F-18 aircraft, upon which most of the prediction was based. Some HARV derivative fairings have been adjusted using basic F-18 derivatives (with low uncertainties) to help account for differences in variable ranges and the lack of HARV maneuvers at certain angles of attack.Iliff, Kenneth W. and Wang, Kon-Sheng CharlesArmstrong Flight Research CenterF-18 AIRCRAFT; ANGLE OF ATTACK; MAXIMUM LIKELIHOOD ESTIMATES; DIRECTIONAL STABILITY; CONTROL SURFACES; AIRCRAFT CONTROL; WIND TUNNEL TESTS; PARAMETER IDENTIFICATION; LATERAL STABILITY
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781722163730 Total Pages :60 pages Book Rating :4.1/5 (637 download)
Book Synopsis Aerodynamic Parameters of an Advanced Fighter Aircraft Estimated from Flight Data. Preliminary Results by : National Aeronautics and Space Administration (NASA)
Download or read book Aerodynamic Parameters of an Advanced Fighter Aircraft Estimated from Flight Data. Preliminary Results written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-02 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt: Preliminary estimates of aerodynamic parameters of an advanced fighter aircraft were obtained from flight data of different values of the angle of attack from 8 to 54 deg. The data were analyzed by a stepwise regression with the ordinary least squares technique. The estimated stability and control derivatives are plotted against the angle of attack and compared with wind tunnel measurement and previous flight results. Also included is the data compatibility check of measured data. The effect of various input forms on the estimates is demonstrated in two examples using simulated data. Klein, Vladislav and Breneman, Keven P. and Ratvasky, Thomas P. Langley Research Center...
Book Synopsis Monthly Catalogue, United States Public Documents by :
Download or read book Monthly Catalogue, United States Public Documents written by and published by . This book was released on 1992-07 with total page 336 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Monthly Catalog of United States Government Publications by :
Download or read book Monthly Catalog of United States Government Publications written by and published by . This book was released on 1992 with total page 996 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis On-Line Robust Modal Stability Prediction Using Wavelet Processing by : Martin J. Brenner
Download or read book On-Line Robust Modal Stability Prediction Using Wavelet Processing written by Martin J. Brenner and published by . This book was released on 1998 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Aeronautical Engineering written by and published by . This book was released on 1991 with total page 538 pages. Available in PDF, EPUB and Kindle. Book excerpt:
