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Extraction Of Lateral Directional Stability And Control Derivatives For The Basic F 18 Aircraft At High Angles Of Attack
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Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781722225872 Total Pages :42 pages Book Rating :4.2/5 (258 download)
Book Synopsis Extraction of Lateral-Directional Stability and Control Derivatives for the Basic F-18 Aircraft at High Angles of Attack by : National Aeronautics and Space Administration (NASA)
Download or read book Extraction of Lateral-Directional Stability and Control Derivatives for the Basic F-18 Aircraft at High Angles of Attack written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-03 with total page 42 pages. Available in PDF, EPUB and Kindle. Book excerpt: The results of parameter identification to determine the lateral-directional stability and control derivatives of an F-18 research aircraft in its basic hardware and software configuration are presented. The derivatives are estimated from dynamic flight data using a specialized identification program developed at NASA Dryden Flight Research Center. The formulation uses the linearized aircraft equations of motions in their continuous/discrete form and a maximum likelihood estimator that accounts for both state and measurement noise. State noise is used to model the uncommanded forcing function caused by unsteady aerodynamics, such as separated and vortical flows, over the aircraft. The derivatives are plotted as functions of angle of attack between 3 deg and 47 deg and compared with wind-tunnel predictions. The quality of the derivative estimates obtained by parameter identification is somewhat degraded because the maneuvers were flown with the aircraft's control augmentation system engaged, which introduced relatively high correlations between the control variables and response variables as a result of control motions from the feedback control system. Iliff, Kenneth W. and Wang, Kon-Sheng Charles Armstrong Flight Research Center RTOP 505-68-50...
Book Synopsis Extraction of Lateral-Directional Stability and Control Derivatives for the Basic F-18 Aircraft at High Angles of Attack by : Kenneth W. Iliff
Download or read book Extraction of Lateral-Directional Stability and Control Derivatives for the Basic F-18 Aircraft at High Angles of Attack written by Kenneth W. Iliff and published by . This book was released on 1997 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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:
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
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 X-29A Lateral-Directional Stability and Control Derivatives Extracted From High-Angle-of-Attack Flight Data by : Kenneth W. Iliff
Download or read book X-29A Lateral-Directional Stability and Control Derivatives Extracted From High-Angle-of-Attack Flight Data written by Kenneth W. Iliff and published by . This book was released on 1996 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Determination of Stability and Control Derivatives from the NASA F/a-18 Harv from Flight Data Using the Maximum Likelihood Method by : National Aeronautics and Space Adm Nasa
Download or read book Determination of Stability and Control Derivatives from the NASA F/a-18 Harv from Flight Data Using the Maximum Likelihood Method written by National Aeronautics and Space Adm Nasa and published by . This book was released on 2018-11-07 with total page 102 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report is a compilation of PID (Proportional Integral Derivative) results for both longitudinal and lateral directional analysis that was completed during Fall 1994. It had earlier established that the maneuvers available for PID containing independent control surface inputs from OBES were not well suited for extracting the cross-coupling static (i.e., C(sub N beta)) or dynamic (i.e., C(sub Npf)) derivatives. This was due to the fact that these maneuvers were designed with the goal of minimizing any lateral directional motion during longitudinal maneuvers and vice-versa. This allows for greater simplification in the aerodynamic model as far as coupling between longitudinal and lateral directions is concerned. As a result, efforts were made to reanalyze this data and extract static and dynamic derivatives for the F/A-18 HARV (High Angle of Attack Research Vehicle) without the inclusion of the cross-coupling terms such that more accurate estimates of classical model terms could be acquired. Four longitudinal flights containing static PID maneuvers were examined. The classical state equations already available in pEst for alphadot, qdot and thetadot were used. Three lateral directional flights of PID static maneuvers were also examined. The classical state equations already available in pEst for betadot, p dot, rdot and phi dot were used. Enclosed with this document are the full set of longitudinal and lateral directional parameter estimate plots showing coefficient estimates along with Cramer-Rao bounds. In addition, a representative time history match for each type of meneuver tested at each angle of attack is also enclosed. Napolitano, Marcello R. Unspecified Center...
Book Synopsis Real-Time Stability and Control Derivative Extraction From F-15 Flight Data by : Mark S. Smith
Download or read book Real-Time Stability and Control Derivative Extraction From F-15 Flight Data written by Mark S. Smith and published by . This book was released on 2003 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Optimization Based Clearance of Flight Control Laws by : Andreas Varga
Download or read book Optimization Based Clearance of Flight Control Laws written by Andreas Varga and published by Springer. This book was released on 2011-11-23 with total page 453 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book summarizes the main achievements of the EC funded 6th Framework Program project COFCLUO – Clearance of Flight Control Laws Using Optimization. This project successfully contributed to the achievement of a top-level objective to meet society’s needs for a more efficient, safer and environmentally friendly air transport by providing new techniques and tools for the clearance of flight control laws. This is an important part of the certification and qualification process of an aircraft – a costly and time-consuming process for the aeronautical industry. The overall objective of the COFCLUO project was to develop and apply optimization techniques to the clearance of flight control laws in order to improve efficiency and reliability. In the book, the new techniques are explained and benchmarked against traditional techniques currently used by the industry. The new techniques build on mathematical criteria derived from the certification and qualification requirements together with suitable models of the aircraft. The development of these criteria and models are also presented in the book. Because of wider applicability, the optimization-based clearance of flight control laws will open up the possibility to design innovative aircraft that today are out of the scope using classical clearance tools. Optimization-based clearance will not only increase safety but it will also simplify the whole certification and qualification process, thus significantly reduce cost. The achieved speedup will also support rapid modeling and prototyping and reduce “time to market”.
Book Synopsis Subsonic Stability and Control Derivatives for an Unpowered, Remotely Piloted 3/8 Scale F-15 Airplane Model Obtained from Flight Test by : Kenneth W. Iliff
Download or read book Subsonic Stability and Control Derivatives for an Unpowered, Remotely Piloted 3/8 Scale F-15 Airplane Model Obtained from Flight Test written by Kenneth W. Iliff and published by . This book was released on 1976 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Evaluation of Importance of Lateral Acceleration Derivatives in Extraction of Lateral-directional Derivatives at High Angles of Attack by : Luat T. Nguyen
Download or read book Evaluation of Importance of Lateral Acceleration Derivatives in Extraction of Lateral-directional Derivatives at High Angles of Attack written by Luat T. Nguyen and published by . This book was released on 1974 with total page 61 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Stability and Control Derivatives for the F-4E Aircraft by : David L. Carleton
Download or read book Stability and Control Derivatives for the F-4E Aircraft written by David L. Carleton and published by . This book was released on 1969 with total page 77 pages. Available in PDF, EPUB and Kindle. Book excerpt: This document presents stability and control derivatives for the F-4E aircraft which were extracted from flight test data using several data reduction techniques. Data reduction methods gave realistic results but the quality of the results could be improved. Flight test results were compared with available wind tunnel predictions. Flight test results differed significantly from the wind tunnel data by showing a strong noseup pitching moment when accelerating through the transonic region, positive directional stability over the sideslip range was encountered during wing rock at high angles of attack, and large adverse yaw due to aileron deflection at high angles of attack. (Author).
Book Synopsis Estimation of the Lateral-directional Stability and Control Derivatives for the NASA F/A-18 HARV with the Maximum Likelihood Method Using Kalviste's Dynamic Modeling by : Brad Alan Seanor
Download or read book Estimation of the Lateral-directional Stability and Control Derivatives for the NASA F/A-18 HARV with the Maximum Likelihood Method Using Kalviste's Dynamic Modeling written by Brad Alan Seanor and published by . This book was released on 1995 with total page 258 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Flight-determined stability and control derivatives for the F-111 TACT research aircraft by : Alex G. Sim
Download or read book Flight-determined stability and control derivatives for the F-111 TACT research aircraft written by Alex G. Sim and published by . This book was released on 1978 with total page 84 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 1999 with total page 892 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Aeronautical Journal written by and published by . This book was released on 2000 with total page 742 pages. Available in PDF, EPUB and Kindle. Book excerpt:
