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Author: J. Norman Ball Publisher: ISBN: Category : Airplanes Languages : en Pages : 28
Book Description
The usefulness of digital techniques in the flight control systems of aircraft, missiles, and space vehicles is considered. The discussion is in terms of basic attitude control loops, and does not extend to outer loops used for guidance or navigation. It is pointed out that there are various techniques and types of equipment to which the word digital is applied. The discussion then considers in turn the various forms of input command and their influence, sensors, analog-digital and digital-analog converters, computers and computing methods for the attitude control task, and actuating devices for producing control moments. The choices between analog and digital methods are engineering decisions to be made in the light of various design requirements for each specific case. The problem of conversion between analog and digital information appears as a key point. For proper attitude control in the presence of structural vibrations, a high sampling and computing rate is necessary. Digital techniques provide accuracy, freedom from drift, insensitivity to stray noise, and adaptability to automatic checkout. They are well suited to implementation of nonlinear and adaptive control systems. (Author).
Author: J. Norman Ball Publisher: ISBN: Category : Airplanes Languages : en Pages : 28
Book Description
The usefulness of digital techniques in the flight control systems of aircraft, missiles, and space vehicles is considered. The discussion is in terms of basic attitude control loops, and does not extend to outer loops used for guidance or navigation. It is pointed out that there are various techniques and types of equipment to which the word digital is applied. The discussion then considers in turn the various forms of input command and their influence, sensors, analog-digital and digital-analog converters, computers and computing methods for the attitude control task, and actuating devices for producing control moments. The choices between analog and digital methods are engineering decisions to be made in the light of various design requirements for each specific case. The problem of conversion between analog and digital information appears as a key point. For proper attitude control in the presence of structural vibrations, a high sampling and computing rate is necessary. Digital techniques provide accuracy, freedom from drift, insensitivity to stray noise, and adaptability to automatic checkout. They are well suited to implementation of nonlinear and adaptive control systems. (Author).
Author: Robert C. Nelson Publisher: WCB/McGraw-Hill ISBN: 9780071158381 Category : Aerodynamique / Aeronautique / Aerospatial / Automatique / Avion / Commande / Conception / Controle / Navigation / Stabilite Languages : en Pages : 441
Book Description
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: Ellis F. Hitt Publisher: ISBN: Category : Languages : en Pages : 514
Book Description
The purpose of this handbook is to identify techniques, methodologies, tools, and procedures in a systems context that may be applicable to aspects of the validation and certification of digital systems at specific times in the development, and implementation of software based digital systems to be used in flight control/avionics applications. The application of these techniques in the development of discrete units and/or systems will result in completion of a product or system which is verfiable and can be validated in the context of the existing regulations/orders of the government regulatory agencies. The handbook uses a systems engineering approach to the implementation and testing of software and hardware during the design, development, and implementation phases. The handbook also recognizes and provides for the evaluation of the pilot's workload in the utilization of the new control/display technology, especially when crew recognition and intervention may be necessary to cope with/recover from the effects of faults or failures in the digital systems or the crew introduces errors into the system under periods of high workload due to some inadvertent procedure or entry of incorrect or erroneous data.
Author: Roger Pratt Publisher: IET ISBN: 9780852967669 Category : Technology & Engineering Languages : en Pages : 416
Book Description
Annotation Bridging the gap between academic research and real-world applications, this reference on modern flight control methods for fixed-wing aircraft deals with fundamentals of flight control systems design, then concentrates on applications based on the modern control methods used in the latest aircraft. The book is written for practicing engineers who are new to the aviation industry, postgraduate students in strategic or applied research, and advanced undergraduates. Some knowledge of classical control is assumed. Pratt is a member of IEEE and is UK Member for AIAA's Technical Committee on Guidance, Navigation and Control. Annotation c. Book News, Inc., Portland, OR (booknews.com)
Author: Richard F. Whitbeck Publisher: ISBN: Category : Airplanes Languages : en Pages : 32
Book Description
Revisitation and extension of classical sampled data approaches for the analysis of discretely controlled continuous systems is the focus of this report. A review of basic linear analysis topics required to support later developments is given. These topics include Laplace, z- and advanced z-transform facts; partial fraction expansion; data holds and the switch decomposition technique. Extension of switch decomposition for the vector signal case is given. A new direct transform domain approach for analyzing two-rate sampled systems is developed. This approach also applies for multi-rate sampled systems in restricted circumstances. Utility of this approach resides in its operator notation and conventions for manipulation in connection with vector block diagram algebra. This, in turn, expedites development of pulse transfer functions and of response recursion relations for multivariable, closed-loop systems. This is accomplished without resorting to the more complicated switch decomposition method. Multi-rate sampling analysis procedures are used to sharpen the concept of 'frequency response' for discretely excited, continuous systems. All methods of analysis presented in this report are closed-form and exact in that no approximation is required in the mathematical development of any result.
Author: M. A. Bender Publisher: ISBN: Category : Languages : en Pages : 437
Book Description
The Digital Flight Control Systems for Tactical Fighters Program is a development program which defines the technology necessary to apply digital flight control techniques to the three-axis, multiple flight control configuration demands of advanced fighter aircraft. Analysis efforts to date have defined powerful computer program tools which permit determination of flight control system performance as a function of computational parameters -- word length, sample rate, and computational delays. An exercise of the programs using the F-4 as a model indicated 100 iterations per second as satisfactory for the longitudinal axis.
Author: James E. Tomayko Publisher: Createspace Independent Pub ISBN: 9781480218208 Category : Technology & Engineering Languages : en Pages : 196
Book Description
One hundred years after the Wright brothers' first powered flight, airplane designers are unshackled from the constraints that they lived with for the first seven decades of flight because of the emergence of digital fly-by-wire (DFBW) technology. New designers seek incredible maneuverability, survivability, efficiency, or special performance through configurations which rely on a DFBW system for stability and controllability. DFBW systems have contributed to major advances in human spaceflight, advanced fighters and bombers, and safe, modern civil transportation. The story of digital fly-by-wire is a story of people, of successes, and of overcoming enormous obstacles and problems. The fundamental concept is relatively simple, but the realization of the concept in hardware and software safe enough for human use confronted the NASA-industry team with enormous challenges. But the team was victorious, and Dr. Tomayko tells the story extremely well. Today, digital fly-by-wire systems are integral to the operation of a great many aircraft. These systems provide numerous advantages over older mechanical arrangements. By replacing cables, linkages, push rods, pull rods, pulleys, and the like with electronic systems, digital fly-by-wire reduces weight, volume, the number of failure modes, friction, and maintenance. It also enables designers to develop and pilots to fly radical new configurations that would be impossible without the digital technology. Digital fly-by-wire aircraft can exhibit more precise and better maneuver control, greater combat survivability, and, for commercial airliners, a smoother ride. The F-8 Digital Fly-By-Wire Project made two significant contributions to the new technology: (1) a solid design base of techniques that work and those that do not, and (2) credible evidence of good flying qualities and the ability of such a system to tolerate real faults and to continue operation without degradation. The narrative of this study captures the intensity of the program in successfully resolving the numerous design challenges and management problems that were encountered. This, in turn, laid the groundwork for leading, not only the U.S., but to a great extent the entire world's aeronautics community into the new era of digital fly-by-wire flight controls. The book also captures the essence of what NASA is chartered to do—develop and transfer major technologies that will keep the U.S. in a world leadership role as the major supplier of commercial aviation, military, and aerospace vehicles and products. The F-8 project is an example of how advanced technology developed in support of the agency's space program, in this case the Apollo endeavor, can be successfully transferred to also address the agency's aeronautics research and development goals, greatly multiplying payoff on taxpayer investments and resources.
Author: J. Norman Ball
Author: J. Norman Ball
Author: Robert C. Nelson
Author: W.M. Kidd
Author: Ellis F. Hitt
Author: 
Author: Roger Pratt
Author: Richard F. Whitbeck
Author: Defense Documentation Center (U.S.)
Author: M. A. Bender
Author: James E. Tomayko