| Investigation of Controllability Criteria of Class III Aircraft Equipped with a Sidestick |
DEC 94 |
77 pages |
| Authors:
V. V. Rodchenko; L. E. Zaichik; Yu. P. Yashin; V. S. Perebatov; V. V. Lyasnikov; CENTRAL AERODYNAMIC INST MOSCOW (RUSSIA)
|
 | This work considers the controllability problems of Class III aircraft (large, heavy, low-to-medium maneuverability aircraft) equipped with sidestick controllers. This effort was done at TsAGI (Central Aerohydrodynamic Institute of Russia) in compliance with contract SPC-93-4046. The authors analyzed the existing data in the literature, conducted flight simulator investigations to generate new data, generalized the existing and new experimental data, conducted theoretical investigations, and compared these results with flight test data ... |
|
| The Development of Auditory Icons for Representation of Virtual Objects in 3-D Space |
DEC 1994 |
41 pages |
| Authors:
Don C. Teas; DYNASTAT INC AUSTIN TX
|
| Recent technology has enabled directional audio displays to be fielded in the cockpit. Directional audio displays convey the location of a sound source to the pilot. If a sound is chosen to indicate a certain event, qualitative data can also be communicated. This study examined several types of auditory signals, or icons, for use in the cockpit. Each of five icons was evaluated for five subjects' ability to localize and ... |
|
| Synthetic Terrain Imagery for Helmet-Mounted Display. Volume 2. Software Design Document |
15 NOV 94 |
106 pages |
| Authors:
Rand Whillock; Bill Corwin; Jeff Groat; HONEYWELL TECHNOLOGY CENTER MINNEAPOLIS MN
|
| The software that has been developed as part of the Synthetic Terrain Imagery (STI) Helmet-Mounted Display program is written in C and is designed to execute on a Silicon Graphics VGX Workstation. This software was developed for purposes of evaluating the utility of synthetically derived representations of the local terrain presented on a helmet mounted display. |
|
| Synthetic Terrain Imagery for Helmet-Mounted Display. Volume 1 |
15 NOV 94 |
77 pages |
| Authors:
Bill Corwin; Rand Whillock; Jeff Groat; HONEYWELL TECHNOLOGY CENTER MINNEAPOLIS MN
|
| In order to aggressively maneuver an aircraft at low altitude, the pilot must be aware of his attitude as well as the elevation of the surrounding terrain. Low altitude tactical maneuvering is difficult during day operations but becomes nearly impossible at night without an effective night attack system. A system that generates a terrain image from onboard data without the use of sensors would be valuable day or night under ... |
|
| Synthetic Terrain Imagery for Helmet-Mounted Display. Volume 3. Software User's Manual |
15 NOV 94 |
16 pages |
| Authors:
Rand Whillock; Bill Corwin; Jeff Groat; HONEYWELL TECHNOLOGY CENTER MINNEAPOLIS MN
|
| The purpose of this document is to describe how to use the STI software program (STI). The software samples data from a preprocessed database created from the U.S. Defense Mapping Agency's Digital Terrain Elevation Data (DTED) database and renders, in perspective view, the visual scene. An NTSC video signal drives a helmet-mounted display. The Synthetic Terrain Imagery for Helmet Mounted Display program was written to present digital terrain elevation data ... |
|
| Robust Fixed-Structure Control |
30 OCT 94 |
27 pages |
| Authors:
Dennis S. Bernstein; MICHIGAN UNIV ANN ARBOR DEPT OF AEROSPACE ENGINEERING
|
| This final report for AFOSR Grant F49620-92-J-0127 summarizes results obtained in five areas, namely, robust control, linear control, sampled-data control, tracking and disturbance rejection, and nonlinear control. Principal results include new bounds for the structured singular value, implementation of structured singular value synthesis using fixed-structure optimization techniques, a more rigorous foundation for the Maximum Entropy control technique, extensions of linear-quadratic control to stable stabilizing controllers, determination of the achievable performance ... |
|
| Proposed Incorporation of Mission-Oriented Flying Qualities into MIL- STD-1797A |
OCT 94 |
452 pages |
| Authors:
David G. Mitchell; Roger H. Hoh; Bimal L. Aponso; David H. Klyde; SYSTEMS TECHNOLOGY INC HAWTHORNE CA
|
| The effort documented in this report was undertaken to revise the flying qualities military standard, MIL-STD-1797A, in both form and content. It was felt that mission-oriented requirements on new systems would expand the applicability of the standard to all tasks performed in an operational environment. This allows replacement of Flight Phases and reference to aircraft weight with a series of Mission- Task-Elements. Demonstration maneuvers are included to be an independent ... |
|
| Perception and Control of Locomotion |
30 SEP 94 |
|
| Authors:
John M. Flach; WRIGHT STATE UNIV DAYTON OH DEPT OF PSYCHOLOGY
|
 | This report describes an empirical study to evaluate the ability to track a constant altitude as a function of the structure in optical flow (Manipulated using types of ground texture - splay, depression, dot, and block and the rate of forward motion - global optical flow (GOF) rate). Subjects were asked to track a constant altitude (25 ft) in the face of disturbances to the vertical, lateral, and fore-aft axes. ... |
|
| Air Force Microwave Landing System |
20 SEP 1994 |
37 pages |
| Authors:
Thomas F. Gimble; Robert M. Murrell; Ronald M. Nelson; Nancy C. Cipolla; Constance Y. Nethkin; INSPECTOR GENERAL DEPT OF DEFENSE ARLINGTON VA
|
| In the approach and landing phase of aircraft flights, precision approach landing systems are the primary means of navigation during inclement weather or other adverse conditions that limit visibility. During the early 1980's, the Federal Aviation Administration demonstrated that the Microwave Landing System (Microwave System) could replace the Instrument Landing System. Based on congressional direction, the Federal Aviation Administration stated in a biennial Federal ... |
|
| Automation of Hardware-In-The-Loop Testing of Control Systems for Unmanned Air Vehicles |
SEP 1994 |
109 pages |
| Authors:
Michael L. Moats; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| Modern computing advances allow the aerospace controls engineer the ability to design, test, and implement automatic control systems for air vehicles with breath taking speed and accuracy. This work examines the automation of the hardware-in-the-loop testing and implementation of autonomous controllers for Unmanned Air Vehicles. Extraordinary interest is generated in this subject considering automation results in hardware-in-the-loop testing within days of completing a controller design. The entire automation process is ... |
|
| Design and Synthesis of a Real-Time Controller for an Unmanned Air Vehicle |
SEP 94 |
121 pages |
| Authors:
Peter M. Hoffman; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| The Naval Postgraduate School is developing an vertical take-off and landing (VTOL) unmanned air vehicle (UAV) that can transition to horizontal flight, once airborne, in order to take advantage of the improvements in speed, range, and loiter time that horizontal, fixed-wing flight provides. This research investigates the design requirements of the central controlling device for that UAV, including the specific problems of defining the necessary hardware components and developing software ... |
|
| Piloted Evaluation of an Integrated Methodology for Propulsion and Airframe Control Design |
SEP 94 |
13 pages |
| Authors:
Michelle M. Bright; Donald L. Simon; Sanjay Garg; Duane L. Mattern; Richard J. Ranaudo; NATIONAL AERONAUTICS AND SPACE ADMINISTRATION CLEVELAND OH LEWIS RESEARCH CEN TER
|
| An integrated methodology for propulsion and airframe control has been developed and evaluated for a Short Take-Off Vertical Landing (STOVL) aircraft using a fixed base flight simulator at NASA Lewis Research Center. For this evaluation the flight simulator is configured for transition flight using a STOVL aircraft model, a full nonlinear turbofan engine model, simulated cockpit and displays, and pilot effectors. The paper provides a brief description of the simulation ... |
|
| Aircraft and Sub-System Certification by Piloted Simulation (Homologation des Aeronefs et de leur Sous-Systemes par la Simulation Pilotee) |
SEP 94 |
|
| Authors:
ADVISORY GROUP FOR AEROSPACE RESEARCH AND DEVELOPMENT NEUILLY-SUR-SEINE (FRAN CE)
|
| There is a steadily increasing tendency to use piloted flight simulators for official clearance of selected areas of flight envelopes and of system behaviour or malfunctions. This is a natural and desirable evolution from the wide use of simulation during the development of new aircraft. However there is a lack of guidance for certification authorities and aircraft manufacturers on simulation standards, validation procedures and general information on the advantages and ... |
|
| Viscoelastic Properties of Advanced Polymer Composites for Ballistic Protective Applications |
SEP 94 |
287 pages |
| Authors:
Frank K. Ko; Charles Lei; Anisur Rahman; Manal Shaker; Antonios Zavaliangos; DREXEL UNIV PHILADELPHIA PA
|
| The aim of the program on ballistically resistant structures is to develop a fundamental understanding of damage resistance characteristics of protective composite materials of interest of the Army, carried out by a systematic characterization of composite viscoelastic behavior. In the first year of the program, the experimental setup and tooling was organized. DMA testing of Kevlar(TM) 29 and KM2 was initiated to determine long-term mechanical properties for this material system. ... |
|
| Volume 4. Test Management Phase. Chapter 8. Design of Experiments |
SEP 94 |
74 pages |
| Authors:
AIR FORCE TEST PILOT SCHOOL EDWARDS AFB CA
|
| The nature of testing lies in answering a question. This question may be phrased as "Does this system meet the specification requirements?" or as "How much of what I taught was learned by the students?" In both cases, a test is performed to determine the answer. This course material addresses the design of a test or experiment in order to satisfactorily answer the question posed to the tester. In the ... |
|
| An Overview of Aircraft Integrated Control Technology |
SEP 1994 |
|
| Authors:
G. J. Simpkin; DEFENCE SCIENCE AND TECHNOLOGY ORGANIZATION CANBERRA (AUSTRALIA)
|
| Integration of flight control systems with other aircraft subsystems has been shown to significantly enhance the ability of aircraft to achieve mission goals. This report examines the scope and current status of aircraft integrated control technology, through an overview of research programs which have developed Integrated Flight and Propulsion Control (IFPC) systems, Integrated Flight and Fire Control (IFFC) systems, and enabling technologies. Trends observed within integrated control are commented on, ... |
|
| Minima Reduction Simulation Test Results |
JUL 94 |
|
| Authors:
Barry Billmann; Edward Pugacz; Carl Everberg; FEDERAL AVIATION ADMINISTRATION TECHNICAL CENTER ATLANTIC CITY NJ
|
| This report presents the results of tests conducted in a Beech-200 (B-200) simulator located at the Beech Learning Center in Wichita, Kansas, and operated by Flight-Safety International (FSI). The testing was conducted to examine the feasibility of reducing approach minimums below Category I by utilizing a highly accurate navigation signal, such as the Microwave Landing System (MLS), when standard Category II approach and runway lighting are not available. Results are ... |
|
| An Evaluation of Data Entry Devices |
JUL 1994 |
37 pages |
| Authors:
Jane M. Kline; Martin N. Anesgart; Thomas C. Hughes; AERONAUTICAL SYSTEMS CENTER WRIGHT-PATTERSON AFB OH
|
| Guidelines for the USAF Global Positioning System (GPS) Integration (GIG) called for the use of alphanumeric identifiers to define waypoints. Based on this requirement, the question arose whether or not a full alphabetic keypad for data entry was required for integrating GPS into aircraft. The study objective was to assess subject performance using 6 data entry devices and 6 data types. The data entry devices ... |
|
| Aviation Spatial Orientation in Relationship to Head Position, Attitude Interpretation, and Control |
16 JUN 94 |
112 pages |
| Authors:
Daryl R. Smith; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH
|
| Aircraft instrument design theory assumes pilots maintain head alignment with the aircraft during turn and bank maneuvers. As a result, the outside view through the windscreen is thought to be of a moving horizon. The attitude indicator used in today's aircraft, displays moving horizon symbology thought to accurately represent pilot spatial orientation. Recently, an optokinetic collic neck reflex was documented which indicates that pilots align their heads with the horizon ... |
|
| Microcomputer-Based Aircraft Routing and Scheduling. Phase 2 |
08 JUN 94 |
164 pages |
| Authors:
Dan Greenwood; Kendall Nygard; NETROLOGIC INC SAN DIEGO CA
|
| The work concerns research, development and software implementation of distributed mathematical optimization algorithms for aircraft routing and scheduling. Two Air Force application concerns customized short-term scheduling of military aircraft to support mission-critical passenger travel. The mission routing and scheduling procedures developed under the project were coded, and a graphical user interface was developed for prototype use by United States Air Forces in Europe at Ramstein AFB in Germany. In addition ... |
|
| Mixed H2/H Infinity Optimization with Multiple H Infinity Constraints |
JUN 94 |
136 pages |
| Authors:
Julio C. Ullauri; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING
|
| A general mixed H2/Hoo optimal control design with multiple Hoo constraints is developed and applied to two systems, one SISO and the other MIMO. The SISO design model is normal acceleration command following for the F- 16. This design constitutes the validation for the numerical method, for which boundaries between the H2 design and the Hoo constraints arc shown. The MIMO design consists of a longitudinal aircraft plant (short period ... |
|
| Application of Research Techniques for Documenting Cognitive Processes in Air Traffic Control: Sector Complexity and Decision Making |
JUN 94 |
115 pages |
| Authors:
R. H. Mogford; E. E. Murphy; R. J. Roske-Hofstrand; G. Yastrop; J. A. Guttman; CTA INC MCKEE CITY NJ
|
| Air traffic controller decision making is a key contributor to safety in the National Airspace System (NAS). Little systematic attention has been paid, however, to investigating the parameters of controller decision making or the factors that affect decision making in the air traffic control (ATC) environment. Because controller decision making takes place within the context of controlled airspace, it is necessary to understand the elements of that context as potential ... |
|
| An Analysis of Tower (Local) Controller - Pilot Voice Communications |
JUN 94 |
28 pages |
| Authors:
Kim M. Cardosi; JOHN A VOLPE NATIONAL TRANSPORTATION SYSTEMS CENTER CAMBRIDGE MA
|
| The purposes of this analysis were to examine current pilot- controller communication practices in the terminal environment. Forty-nine hours of voice tapes from local positions in ten Air Traffic Control Towers (ATCTs) were examined. There were 8,444 controller-to-pilot messages (e.g., clearances to takeoff or land, instructions to hold short or change radio frequencies, etc. ) examined in this study. The complexity of the controller's message (i.e., the number of pieces ... |
|
| Adaptive Control of Nonlinear Flexible Systems |
26 MAY 94 |
53 pages |
| Authors:
Robert L. Kosut; M. G. Kabuli; INTEGRATED SYSTEMS INC SANTA CLARA CA
|
| The objective is the development of adaptive control methods which can significantly improve closed-loop performance for a broad class of nonlinear flexible systems. Towards this end, a nonlinear controller, applicable to a broad class of nonlinear systems, was devised. The controller consists of a feedforward signal generator which incorporates a model estimate together with a global feedback linearizer. There is an inner feedback controller which modifies control action in accordance ... |
|
| Collected Papers of the Soar/IFOR Project. Spring 1994 |
25 APR 94 |
|
| Authors:
W. L. Johnson; Randolph M. Jones; David Keirsey; Frank V. Koss; John E. Laird; CARNEGIE-MELLON UNIV PITTSBURGH PA DEPT OF COMPUTER SCIENCE
|
| Since the summer of 1992, the Soar/IFOR research group has been building intelligent automated agents for tactical air simulation. The ultimate goal of this project is to develop automated pilots whose behavior in simulated engagements is indistinguishable from that of human pilots. This technical report is a collection of the research paper's that have been generated from this project as of Spring 1994. The research covered in these papers spans ... |
|
| A Neural Expert Approach to Self Designing Flight Control Systems |
21 APR 94 |
70 pages |
| Authors:
Sherif M. Botros; Alper K. Caglayan; Greg L. Zacharias; CHARLES RIVER ANALYTICS INC CAMBRIDGE MA
|
| Based on the simulations performed in this phase I study, we show that Hopfield and RBF feedfoward network architectures may have a great potential in the control of nonlinear systems. In particular, Hopfield implementation of Lagrange multiplier method is suitable for real-time adaptive optimal control. Similarly, RBF feedforward neural network architectures are suitable for learning inverse dynamics and inverse trim in aircraft FCS applications. In addition, RBF feedfoward are easier ... |
|
| Refinement for Fault-Tolerance: An Aircraft Hand-Off Protocol |
APR 94 |
21 pages |
| Authors:
Keith Marzullo; Fred B. Schneider; Jon Dehn; CORNELL UNIV ITHACA NY DEPT OF COMPUTER SCIENCE
|
| Part of the Advanced Automation System (AAS) for air-traffic control is a protocol to permit flight hand-off from one-air-traffic controller to another. The protocol must be fault-tolerant and, therefore, is subtle-an ideal candidate for the application of formal methods. This paper describes a formal method for deriving fault-tolerant protocols that is based on refinement and proof outlines. The AAS hand-off protocol was actually derived using this method; that derivation is ... |
|
| Effective Declutter of Complex Flight Displays Using Stereoptic 3-D cueing |
APR 94 |
25 pages |
| Authors:
Russell V. Parrish; Steven P. Williams; Dean E. Nold; NATIONAL AERONAUTICS AND SPACE ADMINISTRATION HAMPTON VA LANGLEY RESEARCH CEN TER
|
| This application of stereo technology to new, integrated pictorial display formats has been effective in situational awareness enhancements, and stereo has been postulated to be effective for the declutter of complex informational displays. This paper reports a full-factorial workstation experiment performed to verify the potential benefits of stereo cueing for the declutter function in a simulated tracking task. The experimental symbology was designed similar to that of a conventional flight ... |
|
| Workshop on Formal Models for Intelligent Control |
APR 94 |
|
| Authors:
Sanjoy K. Mitter; MASSACHUSETTS INST OF TECH CAMBRIDGE
|
| A workshop on Formal Models for Intelligent Control, jointly funded by the Army Office (ARO) and the National Aeronautics and Space Administration (NASA), and jointly sponsored by the Center for Intelligent Control Systems (CICS) and the University of California at Berkeley's Intelligent Machines and Robotics Laboratory, was held at M.I.T. during 30 September--2 October 1993. The workshop brought together a large number of researchers and specialists from universities, the government, ... |
|
| Extrapolating Storm Location Using the Integrated Terminal Weather System (ITWS) Storm Motion Algorithm |
29 MAR 94 |
|
| Authors:
E. S. Chornoboy; A. Matlin; MASSACHUSETTS INST OF TECH LEXINGTON LINCOLN LAB
|
| Storm Motion (SM) is a planned initial Operational Capability (IOC) algorithm of the FAA's Integrated Terminal Weather System (ITWS). As currently designed, this algorithm will track the movement of storms/cells and convey this tracking information to the ITWS user by means of a graphic display of vectors (for direction) with accompanying numeric reports of storm speed, rounded to the nearest 5 nmi/hr increment. Recognizing that there are occasions when ITWS ... |
|
| Fluid Dynamic Linear Accelerometer. |
08 MAR 1994 |
|
| Authors:
David R. Keyser; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| A linear acceleration sensing device operates through a fluid medium. A fluid signal output represents a differential pressure from the elastic deformation of a fluid-filled diaphragm or bellows assembly. A pair of fluid proximity sensors operate differentially in a fluid control network and detect the elastic deformation of the diaphragm assembly caused by increased hydrostatic pressure resulting from a change in acceleration, or 'g' force |
|
| A Handling Qualities Investigation of Conventional, Rate Command/ Attitude Hold, and Attitude Command/Attitude Hold Response-Types in the Probe and Drogue Air Refueling Task |
MAR 94 |
315 pages |
| Authors:
Michael J. Taschner; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING
|
| This investigation examines the suitability of conventional, rate command/attitude hold (RCAH), and attitude command attitude hold (ACAH) response-types for the probe and drogue air refueling task. Data from a 1974 Calspan handling qualities investigation involving conventional response-types in the probe and drogue air refueling task were analyzed using the Bandwidth and STI Dropback criterions. Flight control laws were developed to achieve twelve superaugmented and two conventional configurations. The NT-33A analog ... |
|
| Direct Reduced Order Mixed H2/H infinity Control for the Short Take-Off and Landing/Maneuver Technology Demonstrator (STOL/MTD) |
MAR 94 |
169 pages |
| Authors:
William C. Reigelsperger Jr; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING
|
| One of the conclusions from the STOL/MTD program was the need for a multivariable method of designing controllers of low order. This research investigated that problem by studying reduced order mixed H-two/H-infinity control theory applied to the STOL Landing configuration which employs both thrust vectoring and the use of a canard. Model matching techniques were used to obtain responses that met handling qualities criteria and reduced pilot workload by decoupling ... |
|
| Design of Robust Optimal Control Systems and Stability Analysis of Real Structured Uncertainties |
MAR 94 |
149 pages |
| Authors:
Bor-Chin Chang; Ajmal Yousuff; DREXEL UNIV PHILADELPHIA PA
|
| This report addresses the computational problems arising in the design of robust controllers via H-inf optimization and mu-synthesis and proposes several new controller reduction approaches. Through our discovery of the convexity and monotonicity properties of the general parameter dependent H- inf Riccati equation, a quadratically convergent algorithm which is faster than the other existing search schemes is developed to compute the optimal H-inf norm. It is desired to preserve the ... |
|
| Programmable Cockpit Research Simulator |
MAR 94 |
27 pages |
| Authors:
M. Iob; A. G. Page; D. A. Craven; AERONAUTICAL RESEARCH LABS MELBOURNE (AUSTRALIA)
|
| The 'Programmable Cockpit' is a low-cost facility to be used for study and development of the aircrew-vehicle interface for future aircraft systems. It was designed so that instrument layouts and display formats could be reconfigured rapidly and tested in a realistic aircraft representation or emulation, with the pilot under representative workload conditions. It is not intended to be used for pilot training and/or evaluation. It uses personal computers and computer ... |
|
| Color control in a Multichannel Simulator Display: The Display for Advanced Research and Training |
MAR 94 |
35 pages |
| Authors:
Celeste M. Howard; DAYTON UNIV OH RESEARCH INST
|
| This report outlines the principles for color-matching of computer- generated imagery in displays made up of sectors served by several display devices. These principles are discussed with reference to a particular multichannel simulator display for which the display devices are projection cathode ray tubes. Gamma functions, Simulator displays, Device-independent color rendering, Large-screen displays, Visual displays, Display characterization, Projection CRTs. |
|
| Basic Principles of Flight Test Instrumentation Engineering. Volume 1, Issue 2 (Introduction Generale aux Principes de Base de l'Instrumentation des Essais en Vol) |
MAR 94 |
|
| Authors:
R. W. Borek; A. Pool; ADVISORY GROUP FOR AEROSPACE RESEARCH AND DEVELOPMENT NEUILLY-SUR-SEINE (FRAN CE)
|
| Since the publication of this volume about 15 years ago, the AGARD flight Test Instrumentation Series - to which this Volume 1 is the introduction - has grown to 18 volumes coverings many important aspects in the field of flight test engineering. This introductory volume has been extensively and successfully used as an introduction to flight test for those just starting in this field and as a reference volume for ... |
|
| AGARD Flight Test Instrumentation Series. Volume 1, Issue 2. Basic Principles of Flight Test Instrumentation Engineering (Introduction Generale aux Principles de Base de l'Instrumentation des Essais en Vol) |
MAR 1994 |
|
| Authors:
ADVISORY GROUP FOR AEROSPACE RESEARCH AND DEVELOPMENT NEUILLY-SUR-SEINE (FRANCE)
|
| Since the publication of this volume about 15 years ago, the AGARD flight Test Instrumentation Series - to which this Volume 1 is the introduction - has grown to 18 volumes covering many important aspects in the field of flight test engineering. This introductory volume has been extensively and successfully used as an introduction to flight test for those just starting in this field and as a reference volume for ... |
|
| Aeroservoelastic Tailoring with Piezoelectric Materials: Actuator Optimization Studies |
09 FEB 94 |
48 pages |
| Authors:
Terrence A. Weisshaar; Mario A. Rotea; PURDUE UNIV LAFAYETTE IN SCHOOL OF AERONAUTICS AND ASTRONAUTICS
|
| This report summarizes aeroservoelastic tailoring studies in which adaptive material actuators are used to control structural deflection of aeroelastic systems. The problem is to furnish enough directed control of a system to make the control of the phenomenon feasible. Specific research problems considered are: choice of the actuator material for effective control; geometric arrangement for active control; and optimum coverage of surface panels for effective control. A specific method of ... |
|
| Testing Operational Flight Programs (OFPS) |
FEB 94 |
13 pages |
| Authors:
Charles P. Satterthwaite; WRIGHT LAB WRIGHT-PATTERSON AFB OH
|
| Operational Flight Programs are the software programs of avionics embedded computer systems. Not only is it desirable to be able to test and model Operational Flight Programs, it is essential. The consequences of not performing accurate Operational Flight Program testing can be devastating. Some of these include premature weapon releases, erroneous flight instrument displays, and complete system failure. In order to test Operational Flight Programs, there are several things one ... |
|
| A Computer Program to Obtain Time-Correlated Gust Loads for Nonlinear Aircraft Using the Matched-Filter-Based Method |
FEB 94 |
46 pages |
| Authors:
Robert C. Scott; Anthony S. Pototzky; Boyd Perry III; NATIONAL AERONAUTICS AND SPACE ADMINISTRATION HAMPTON VA LANGLEY RESEARCH CEN TER
|
| NASA Langley Research Center has, for several years, conducted research in the area of time-correlated gust loads for linear and nonlinear aircraft. The results of this work led NASA to recommend that the Matched- Filter-Based One-Dimensional Search Method be used for gust load analyses of nonlinear aircraft. This manual describes this method, describes a FORTRAN code which performs this method, and presents example calculations for a sample nonlinear aircraft model. ... |
|
| The Maintenance of Operational Flight Program |
JAN 94 |
10 pages |
| Authors:
Charles P. Satterthwaite; WRIGHT LAB WRIGHT-PATTERSON AFB OH
|
| The process of maintaining Operational Flight Programs (OFPS) is discussed so that interested individuals can understand (1) how OFPS work, (2) how OFPS are changed, (3) how OFPS are tested, (4) how OFPS are documented, (5) how to train OFP maintainers, and (6) how to measure OFPS. |
|
| Automation of Formation Flight Control |
94 |
193 pages |
| Authors:
Vincent P. Reyna; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING
|
| The research contained in this thesis explores the concepts of Automated Formation Flight Control documented in three previous AFIT theses. The generic formation analyzed consists of a Leader and Wingman, with the Wingman referencing its maneuvers off of Leader maneuvers. Specifically, planar formation flight control concerning only heading and velocity changes is considered. Next, the vertical separation constraint is relaxed to allow wing maneuvers outside of the flight plane of ... |
|
| Comparison of Frequency Response and Perturbation Methods to Extract Linear Models from a Nonlinear Simulation |
94 |
14 pages |
| Authors:
Keith A. Balderson; Jeffrey T. Weathers; NAVAL AIR WARFARE CENTER AIRCRAFT DIV PATUXENT RIVER MD
|
| The purpose of this paper is to compare two distinct methods to extract a linear state-space model about a reference flight condition from a nonlinear simulation. The frequency response method uses a time history input which contains the frequencies of interest to drive the simulation. The frequency response method uses a time history input which contains the frequencies of interest to drive the simulation frequency input and the output of ... |
|
| The Use of Genetic Algorithms for Flight Test and Evaluation of Artificial Intelligence and Complex Software Systems |
94 |
6 pages |
| Authors:
Elizabeth Davies; John McMaster; Mary Stark; NAVAL AIR WARFARE CENTER AIRCRAFT DIV PATUXENT RIVER MD
|
| Artificial Intelligence (AI) technologies are emerging from research laboratories into industry, particularly into the field of aviation. One such application is the ARPA/USAF Pilot's Associate, a set of cooperating expert systems designed to aid the tactical pilot in a combat situation. There are currently no rigorous methods for the test and evaluation of such tactical airborne expert systems. The focus of this program, sponsored in part by the Office of ... |
|
| High Angle of Attack Short Period Flight Control Design with Thrust Vectoring |
94 |
6 pages |
| Authors:
Kelly D. Hammett; William C. Reigelsperger; Siva S. Banda; WRIGHT LAB WRIGHT-PATTERSON AFB OH
|
| A manual flight control system for the short period dynamics of a modern fighter aircraft incorporating thrust vectoring at high angles of attack (a) is presented. Design goals are posed in terms of maintaining acceptable flying qualities during high a maneuvering while also achieving robustness to model parameter variations and unmodeled dynamics. An inner loop dynamic inversion/outer loop structured singular value (tt) - synthesis control structure is used to separately ... |
|
| Lateral-Directional, Full Envelope Control Law Design for F-16 with Thrust Vectoring |
94 |
12 pages |
| Authors:
William C. Reigelsperger; Kelly D. Hammett; Siva S. Banda; WRIGHT LAB WRIGHT-PATTERSON AFB OH
|
| A manual flight control system for the lateral directional dynamics of a modern fighter aircraft incorporating thrust vectoring is presented. Design goals are posed in terms of maintaining acceptable flying qualities during high alpha maneuvering while also achieving robustness to model parameter variations and unmodeled dynamics over the entire flight envelope. The need for gain scheduling is eliminated by using an inner loop dynamic inversion/outer loop structured singular value (u) ... |
|
| Aircraft Handling Qualities Research and Criteria Development for Nonstationary/Nonlinear Situations |
1994 |
36 pages |
| Authors:
I. I. Fedotov; TSAGI INTERNATIONAL INC SEATTLE WA
|
| In this paper the pilot-aircraft' loop in the nonstationary/ / nonlinear control tasks is considered. The method of creating an adaptive pilot model is suggested on the basis of assuming the existence of the internal describing model of the control object (IDMCO). On the grounds of the calculation results the criterion of the quality estimation of the control process is formulated to be used while solving the control tasks. The ... |
|
| Dynamics and Stability of Spacecraft with Fluid-Filled Containers |
1994 |
207 pages |
| Authors:
Yakup Ozkazanc; MARYLAND UNIV COLLEGE PARK INST FOR SYSTEMS RESEARCH
|
| In this dissertation, the author studies the dynamics, stability, and control of spacecraft with fluid-filled containers. The spacecraft with fluid-filled containers is modeled as a rigid body containing perfect fluid. A general model for the system is obtained by using a Lagrangian approach in which the configuration manifold is the cartesian product of the rotation group and the group of volume preserving diffeomorphisms. The dynamical equations are interpreted as a ... |
|
| Analysis and Characteristics of Compressor Stall Precursor Signals in Forward and AFT Swept High Speed Compressor |
DEC 93 |
127 pages |
| Authors:
Bernard J. Frank; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH
|
| The stall characteristic of four single-stage transonic compressor rotors were investigated as they were throttled to stall. Forward-swept, backward-swept, and straight leading edge rotors were examined. Three methods of analysis (1) windowed power spectrum densities of pressure and spatial Fourier coefficients, (2) phase tracking analysis, and (3) system identification were used to identify the first appearance of modal waves and their accompanying frequencies in order to identify a stall warning ... |
|
Flight Control and Instrumentation
