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Limited Handling Qualities Evaluation Of Augmented Longitudinal Flight Control Systems Designed With State Space Optimization Techniques Have Infinity
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Book Synopsis Limited Handling Qualities Evaluation of Augmented Longitudinal Flight Control Systems Designed with State-Space Optimization Techniques (HAVE INFINITY). by :
Download or read book Limited Handling Qualities Evaluation of Augmented Longitudinal Flight Control Systems Designed with State-Space Optimization Techniques (HAVE INFINITY). written by and published by . This book was released on 1997 with total page 81 pages. Available in PDF, EPUB and Kindle. Book excerpt: This technical report presents the results of a limited handling qualities evaluation of augmented longitudinal flight control systems designed with state-space optimization techniques. The objective of the test was to evaluate the handling qualities of four longitudinal flight control systems during the approach and landing phase of flight. Three of the flight control systems used state-space design techniques and the fourth used classical design techniques. The four flight control systems were evaluated using the Variable Stability Simulator II (VSS II), which was a highly modified Learjet Model 25. Testing was requested by Wright Laboratory, Wright-Patterson AFB, Ohio, and was conducted under the authority of the Commandant, USAF Test Pilot School.
Book Synopsis Flight Test and Handling Qualities Analysis of a Longitudinal Flight Control System Using Multiobjective Techniques by : John R. Anderson
Download or read book Flight Test and Handling Qualities Analysis of a Longitudinal Flight Control System Using Multiobjective Techniques written by John R. Anderson and published by . This book was released on 1998-03-01 with total page 216 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis addresses the application of optimal, multiobjective control theory control theory to flight control design for the approach and landing phase of flight. Five flight control systems were designed using classical, H2, H infinity, and Mixed H2/H infinity methods. The MATLAB(Trade Mark) MUTOOLS(Trade Mark) and AFIT MXTOOLS toolboxes were used to produce the optimal, multiobjective designs. These designs were implemented for flight test on the Calspan VSS I Learjet, simulating the unstable longitudinal dynamics of an F-16 type aircraft. A limited handling qualities investigation was performed. Model following was used in the design phase to meet handling qualities specifications. The designs were successfully implemented and verified on the Calspan Learjet prior to flight test. An unmodeled aircraft mode was discovered just prior to flight test that made three of the designs slightly unstable. However, all of the designs achieved Level II or better Cooper-Harper handling qualities ratings for the landing tasks performed illustrating that the optimal multiobjective methods used can give acceptable or better handling qualities.
Book Synopsis Criteria for Low-Speed Longitudinal Handling Qualities by : H.A. Mooij
Download or read book Criteria for Low-Speed Longitudinal Handling Qualities written by H.A. Mooij and published by Springer Science & Business Media. This book was released on 2013-04-18 with total page 151 pages. Available in PDF, EPUB and Kindle. Book excerpt: In-fl ight simulation experiments performed in 1967 with a variable-stabil ity aircraft during the author's stay at Princeton University, motivated the study of handl ing characteristics of future transport aircraft with closed-loop fl ight control systems. In 1972, the first experiment took place at the National Aerospace Laboratory NLR, using one of its research aircraft. In anticipation of expected developments in (digital) fl ight control technology, the research programme following the first experiments was aimed at the establ ishment of quantitative handl ing qual ities criteria. An appreciable part of that programme has been sponsored by the Netherlands Agency for Aerospace Programs (Nederlands Instituut voor VI iegtuigontwikkel ing en Ruimtevaart) and the Department of Civil Aviation of the Netherlands (Rijksluchtvaartdienst). In 1981, a thorough review of the extensive and valuable data gathered was started. The result, presented in this book, was also included in the author's thesis for a Ph.D. degree of the Delft University of Technology. To introduce the reader to the multi-discipl inary field of handl ing qual ities research, introductory chapters are presented on longitudinal aircraft dynamics, closed-loop fl ight control systems using non-mechanical signal transmission, human pilot dynamics, hand I ing qual ities assessment techniques, and the present status of handl ing qual ity criteria.
Book Synopsis Fixed-base and In-flight Simulations of Longitudinal and Lateral-directional Handling Qualities for Piloted Re-entry Vehicles by : Edwin A. Kidd
Download or read book Fixed-base and In-flight Simulations of Longitudinal and Lateral-directional Handling Qualities for Piloted Re-entry Vehicles written by Edwin A. Kidd and published by . This book was released on 1964 with total page 138 pages. Available in PDF, EPUB and Kindle. Book excerpt: Longitudinal and lateral directional flying qualities for the re-entry mission are reported. The program utilized primarily a high-fidelity fixed-base ground simulator with evaluations made by three pilots. One of the three pilots also made in-flight evaluations of longitudinal flying qualities in the same vehicle, a threeaxis variable stability airplane flown with a two-axis side controller and conventional rubber pedals. Control sensitivity evaluations were compared to center stick results of earlier work. The longitudinal flying qualities as evaluated both on the ground simulator and in flight are compared and related to earlier investigations. Pilot rating variability, both interpilot and intrapilot, are quantized and discussed for the ground and flight experiments. Performance measures are reported.
Book Synopsis Handling Qualities of Unstable Highly Augmented Aircraft by :
Download or read book Handling Qualities of Unstable Highly Augmented Aircraft written by and published by . This book was released on 1991 with total page 107 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Demanding requirements for performance and handling qualities together with extended flight envelopes lead to use of new technologies like active control and control configured unstable vehicles. The review of the handling qualities issues of unstable aircraft which by necessity are highly augmented is the theme of this report. In general the handling qualities criteria for highly augmented stable aircraft are equally applicable to the specialized case of unstable aircraft. Accordingly, this report contains a review of existing highly augmented aircraft, both stable and unstable. Handling qualities criteria for both large and small amplitude longitudinal maneuvers are presented. Other areas of interest are also considered: basic aerodynamic design, specific issues relating to the feel system and control sensitivity, evaluation techniques and the handling qualities design and evaluation process. The subjects of carefree handling, lateral-directional criteria and agility are presented in separate appendices. Where possible the lessions to be learned from the combined experiences of the working group are highlighted
Book Synopsis Evaluating the Handling Qualities of Flight Control Systems Including Nonlinear Aircraft and System Dynamics by : Raymond Chao Lin
Download or read book Evaluating the Handling Qualities of Flight Control Systems Including Nonlinear Aircraft and System Dynamics written by Raymond Chao Lin and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The handling qualities evaluation of nonlinear aircraft systems is an area of concern in loss-of-control (LOC) prevention. The Get Transfer Function (GetTF) method was demonstrated for evaluating the handling qualities of flight control systems and aircraft containing nonlinearities. NASA's Generic Transport Model (GTM), a nonlinear model of a civilian jet transport aircraft, was evaluated. Using classical techniques, the stability, control, and augmentation (SCAS) systems were designed to control pitch rate, roll rate, and airspeed. Hess's structural pilot model was used to model pilot dynamics in pitch and roll-attitude tracking. The simulated task was simultaneous tracking of, both, pitch and roll attitudes. Eight cases were evaluated: 1) gain increase of pitch-attitude command signal, 2) gain increase of roll-attitude command signal, 3) gain reduction of elevator command signal, 4) backlash in elevator actuator, 5) combination 3 and 4 in elevator actuator, 6) gain reduction of aileron command signal, 7) backlash in aileron actuator, and 8) combination of 6 and 7 in aileron actuator. The GetTF method was used to estimate the transfer function approximating a linear relationship between the proprioceptive signal of the pilot model and the command input. The transfer function was then used to predict the handling qualities ratings (HQR) and pilot-induced oscillation ratings (PIOR). The HQR is based on the Cooper-Harper rating scale. In pitch-attitude tracking, the nominal aircraft is predicted to have Level 2* HQR[subscript]pitch and 2 PIOR[subscript]pitch
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 Flight Stability and Automatic Control by : Robert C. Nelson
Download or read book Flight Stability and Automatic Control written by Robert C. Nelson and published by WCB/McGraw-Hill. This book was released on 1998 with total page 441 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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 :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781722234089 Total Pages :42 pages Book Rating :4.2/5 (34 download)
Book Synopsis Feedback Control Laws for Highly Maneuverable Aircraft by : National Aeronautics and Space Administration (NASA)
Download or read book Feedback Control Laws for Highly Maneuverable Aircraft 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 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 :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781723455742 Total Pages :24 pages Book Rating :4.4/5 (557 download)
Book Synopsis Development and Flight Evaluation of an Augmented Stability Active Controls Concept by : National Aeronautics and Space Administration (NASA)
Download or read book Development and Flight Evaluation of an Augmented Stability Active Controls Concept written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-24 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt: A pitch active control system (PACS) was developed and flight tested on a wide body jet transport (L-1011) with a flying horizontal stabilizer. Two dual channel digital computers and the associated software provide command signals to a dual channel series servo which controls the stabilizer power actuators. Input sensor signals to the computer are pitch rate, column trim position, and dynamic pressure. Control laws are given for the PACS and the system architecture is defined. Discussions are given regarding piloted flight simulation and vehicle system simulation and vehicle system simulation tests that are performed to verify control laws and system operation prior to installation on the aircraft. Modifications to the basic aircraft included installation of the PACS, addition of a c.g. management system to provide a c.g. range from 25 to 39% mac, and downrigging of the geared elevator to provide the required nose down control authority for aft c.g. flight test conditions. Three pilots used the Cooper-Harper Rating Scale to judge flying qualities of the aircraft with PACS on and off. The handling qualities with the c.g. at 39% mac (41% stability margin) and PACS operating were judged to be as good as the handling qualities with the c.g. at 25% mac (+15% stability margin) and PACS off. Guinn, W. A. Unspecified Center NASA-CR-166009, NAS 1.26:166009, LR-30208-1 NAS1-15326
Book Synopsis Some Recent Research on the Handling Qualities of Airplanes by : Walter C. Williams
Download or read book Some Recent Research on the Handling Qualities of Airplanes written by Walter C. Williams and published by . This book was released on 1956 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt: Results of recent research on the handling qualities of airplanes are reviewed. Among the subjects considered are dynamic longitudinal stability, transonic trim changes, pitch-up due to decreasing airspeed, dynamic lateral stability, aileron control, rudder control, and mechanical characteristics of power control systems.
Book Synopsis In-flight Investigation of the Effects of Higher-order Control System Dynamics on Longitudinal Handling Qualities by : Dante A. Di Franco
Download or read book In-flight Investigation of the Effects of Higher-order Control System Dynamics on Longitudinal Handling Qualities written by Dante A. Di Franco and published by . This book was released on 1968 with total page 394 pages. Available in PDF, EPUB and Kindle. Book excerpt: The results of a flight test program to investigate the effects of higher-order control system dynamics on the handling qualities of a fighter airplane are presented and discussed. This research was undertaken using the variable stability T-33 airplane as an in-flight simulator. This in-flight investigation was based on a similar fixed-base ground simulator program. Higher-order response characteristics were obtained by altering the elevator stick feel system dynamics and elevator actuator dynamics in conjunction with four different sets of longitudinal short period airplane dynamics. In the investigation, the dynamics of any of the three elements (feel system, actuator, and airplane) could be changed independently of the others. Three of the set of four airplane characteristics were investigated as a fighter in 'up-and-away' flight, and the fourth was evaluated as a fighter during landing approach. Thirty-two different configurations were evaluated by one evaluation pilot (Pilot B) and 35 configurations were evaluated by a second evaluation pilot (Pilot H). Essentially the same configurations were evaluated by both pilots and rated using a new pilot rating scale. Pilot H also rated the configurations for their pilot-induced oscillation (PIO) tendencies using a PIO rating scale. Pilot comments were recorded in flight and the comments and ratings were related to various handling qualities parameters and response characteristics of the configurations. (Author).
Book Synopsis Introduction to Aircraft Flight Mechanics by : Thomas R. Yechout
Download or read book Introduction to Aircraft Flight Mechanics written by Thomas R. Yechout and published by AIAA. This book was released on 2003 with total page 666 pages. Available in PDF, EPUB and Kindle. Book excerpt: Based on a 15-year successful approach to teaching aircraft flight mechanics at the US Air Force Academy, this text explains the concepts and derivations of equations for aircraft flight mechanics. It covers aircraft performance, static stability, aircraft dynamics stability and feedback control.
Book Synopsis Application of Eigenstructure Assignment Techniques in the Design of a Longitudinal Flight Control System by : Daniel G. Goddard
Download or read book Application of Eigenstructure Assignment Techniques in the Design of a Longitudinal Flight Control System written by Daniel G. Goddard and published by . This book was released on 1987 with total page 121 pages. Available in PDF, EPUB and Kindle. Book excerpt: The use of eigenstructure assignment techniques has received wide attention as a tool for designing flight control systems for aircraft with multiple control surfaces. Development of a method for choosing the desired eigenstructure of the augmented, closed-loop system which would meet the handling qualities specifications was examined. This method consisted of forming an optimal plant matrix which possessed desirable dynamic characteristics and performing a spectral decomposition of this matrix. The resulting eigenstructure was used as the desired eigenvalues and eigenvectors during the full-state feedback, eigenstructure assignment process. The resulting feedback gain matrix was used in the control system. This process was performed on a model of the X-29A using the canard, flaperon, and strake flap control surfaces. The resulting augmented system was evaluated using the Neal-Smith pilot-model analysis and also using an X-29A main-in-the-loop simulation. The results show that the method is very promising, although care must be taken that all anticipated control system dynamics are considered when forming the optimal A matrix.
Author :National Aeronautics and Space Adm Nasa Publisher :Independently Published ISBN 13 :9781794408159 Total Pages :36 pages Book Rating :4.4/5 (81 download)
Book Synopsis Complexity and Pilot Workload Metrics for the Evaluation of Adaptive Flight Controls on a Full Scale Piloted Aircraft by : National Aeronautics and Space Adm Nasa
Download or read book Complexity and Pilot Workload Metrics for the Evaluation of Adaptive Flight Controls on a Full Scale Piloted Aircraft written by National Aeronautics and Space Adm Nasa and published by Independently Published. This book was released on 2019-01-22 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt: Flight research has shown the effectiveness of adaptive flight controls for improving aircraft safety and performance in the presence of uncertainties. The National Aeronautics and Space Administration's (NASA)'s Integrated Resilient Aircraft Control (IRAC) project designed and conducted a series of flight experiments to study the impact of variations in adaptive controller design complexity on performance and handling qualities. A novel complexity metric was devised to compare the degrees of simplicity achieved in three variations of a model reference adaptive controller (MRAC) for NASA's F-18 (McDonnell Douglas, now The Boeing Company, Chicago, Illinois) Full-Scale Advanced Systems Testbed (Gen-2A) aircraft. The complexity measures of these controllers are also compared to that of an earlier MRAC design for NASA's Intelligent Flight Control System (IFCS) project and flown on a highly modified F-15 aircraft (McDonnell Douglas, now The Boeing Company, Chicago, Illinois). Pilot comments during the IRAC research flights pointed to the importance of workload on handling qualities ratings for failure and damage scenarios. Modifications to existing pilot aggressiveness and duty cycle metrics are presented and applied to the IRAC controllers. Finally, while adaptive controllers may alleviate the effects of failures or damage on an aircraft's handling qualities, they also have the potential to introduce annoying changes to the flight dynamics or to the operation of aircraft systems. A nuisance rating scale is presented for the categorization of nuisance side-effects of adaptive controllers. Hanson, Curt and Schaefer, Jacob and Burken, John J. and Larson, David and Johnson, Marcus Ames Research Center; Armstrong Flight Research Center DFRC-E-DAA-TN10945, NASA/TM-2014-216640
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 1994 with total page 836 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Theoretical and Experimental Investigation of Some New Longitudinal Handling Qualities Parameters by : Henry R. Jex
Download or read book Theoretical and Experimental Investigation of Some New Longitudinal Handling Qualities Parameters written by Henry R. Jex and published by . This book was released on 1962 with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt: The systems-analysis theory of handling qualities (which describes the pilot's adaptive behavior in closed-loop operation by servo techniques, and relates his opinion-ratings to his adapted characteristics and the system performance) is used to reveal some important parameters associated with the numerator terms in the airframe longitudinal transfer function. The predictions are verified by five experienced test pilots operating in a fixed-base aircraft simulator. Four possible numerator effects on handling qualities are analyzed theoretically: short-period lead effect on pitch attitude tracking, static-to-short-period gain effects on attitude tracking, short-period lead effects on the control of short-period divergence, and numerator frequency and damping effects on altitude tracking. The results are correlated with other test work, and the implications of these results on future handling qualities research and specifications are discussed.
