A Robust Digital Flight Control System For An Unmanned Research Vehicle Using Discrete Quantitative Feedback Theory
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A Robust Digital Flight Control System For An Unmanned Research Vehicle Using Discrete Quantitative Feedback Theory
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Author : Donald Jerry Lacey (CAPT, USAF., Jr)
language : en
Publisher:
Release Date : 1991
A Robust Digital Flight Control System For An Unmanned Research Vehicle Using Discrete Quantitative Feedback Theory written by Donald Jerry Lacey (CAPT, USAF., Jr) and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1991 with Digital control systems categories.
A Robust Digital Flight Control System For An Unmanned Research Vehicle Using Discrete Quantitative Feedback Theory
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Author :
language : en
Publisher:
Release Date : 1991
A Robust Digital Flight Control System For An Unmanned Research Vehicle Using Discrete Quantitative Feedback Theory written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1991 with categories.
This thesis describes application of digital multiple-input multiple- output (MIMO) Quantitative Feedback Theory (QFT) technique to the design of a three axis rate controller for the Lambda Unmanned Research Vehicle. The resulting robust controller performs well throughout the flight envelope without gain scheduling. It results from research done at the Air Force Institute of Technology. The Lambda URV was designed by the Control Systems Development Branch of the Wright Laboratory at Wright-Patterson AFB, OH for flight testing aircraft control hardware and software. The flight control system is built using a small perturbation linear model developed from flight test data. The actuators, also modelled from aircraft test data, are second order in roll and pitch and first order in yaw. Nineteen separate plants are used to represent the flight envelope of the aircraft resulting from variations in speed, altitude, center of gravity location, and weight. The sample rate is 50 Hertz. The pitch channel is decoupled from the lateral-directional resulting in a single-input single-output (SISO) system for the pitch channel and a two-by-two MIMO system for the lateral-directional channel. The design employs the Nichols Chart and is accomplished in the w'-domain.
Quantitative Feedback Theory
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Author : Constantine H. Houpis
language : en
Publisher: CRC Press
Release Date : 2018-10-03
Quantitative Feedback Theory written by Constantine H. Houpis and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-10-03 with Technology & Engineering categories.
The first edition of Quantitative Feedback Theory gained enormous popularity by successfully bridging the gap between theory and real-world engineering practice. Avoiding mathematical theorems, lemmas, proofs, and correlaries, it boiled down to the essential elements of quantitative feedback theory (QFT) necessary to readily analyze, develop, and implement robust control systems. Thoroughly updated and expanded, Quantitative Feedback Theory: Fundamentals and Applications, Second Edition continues to provide a platform for intelligent decision making and design based on knowledge of the characteristics and operating scenario of the plant. Beginning with the fundamentals, the authors build a background in analog and discrete-time multiple-input-single-output (MISO) and multiple-input-multiple-output (MIMO) feedback control systems along with the fundamentals of the QFT technique. The remainder of the book links these concepts to practical applications. Among the many enhancements to this edition are a new section on large wind turbine control system, four new chapters, and five new appendices. The new chapters cover non-diagonal compensator design for MIMO systems, QFT design involving Smith predictors for time delay systems with uncertainty, weighting matrices and control authority, and QFT design techniques applied to real-world industrial systems. Quantitative Feedback Theory: Fundamentals and Applications, Second Edition includes new and revised examples and end-of-chapter problems and offers a companion CD that supplies MIMO QFT computer-aided design (CAD) software. It is the perfect guide to effectively and intuitively implementing QFT control.
Unmanned Research Vehicle Urv Development Implementation Flight Test Of A Mimo Digital Flight Control System Designed Using Quantitative Feedback Theory
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Author : C. H. Houpis
language : en
Publisher:
Release Date : 2000
Unmanned Research Vehicle Urv Development Implementation Flight Test Of A Mimo Digital Flight Control System Designed Using Quantitative Feedback Theory written by C. H. Houpis and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2000 with categories.
The Quantitative Feedback Theory (QFT) design technique, which has the ability to bridge the gap between theory and the real-world control design problem, is utilized in the design of a MIMO digital flight control system for an unmanned research vehicle (URV) that is presented in this paper. The design illustrates how the real-world knowledge of the plant to be controlled and the desired performance specifications can be utilized in trying to achieve a successful robust design for a nonlinear control problem. This paper presents some of the issues involved in developing, implementing, and flight testing a flight control system (FCS) designed using QFT. Achieving a successful FCS involves a number of steps: specification of the control problem, aircraft model data, theoretical flight control system design, implementation, ground testing, and flight test. The last three steps embody the practical engineering aspects that are vital to achieving a successful FCS. The main emphasis of this paper is on these steps. First, there is a brief explanation of the MIMO design QFT process. This is followed by a description of the steps involved in the implementation and testing of a QFT designed FCS. Thus, this presentation provides an overview of using robust control system design to increase quality in attempting to demonstrate the "Bridging the Gap" between control theory and the realities of a successful control system design. In facing the technological problems of the future, it is necessary that engineers of the future must be able to bridge the gap, i.e., this Bridging the Gap must be addressed to better prepare the engineers for the 21st century.
Automatic Flight Control System Design For An Unmanned Research Vehicle Using Discrete Quantitative Feedback Theory
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Author : David G. Wheaton (CAPT, USAF.)
language : en
Publisher:
Release Date : 1990
Automatic Flight Control System Design For An Unmanned Research Vehicle Using Discrete Quantitative Feedback Theory written by David G. Wheaton (CAPT, USAF.) and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1990 with Airplanes categories.
Automatic Flight Control System Design For An Unmanned Research Vehicle Using Discrete Quantitative Feedback Theory
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Author :
language : en
Publisher:
Release Date : 1990
Automatic Flight Control System Design For An Unmanned Research Vehicle Using Discrete Quantitative Feedback Theory written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1990 with categories.
This thesis presents the application of non-minimum phase (NMP) w'- plane discrete MIMO (multiple-input-multiple-output) Quantitative Feedback Theory (QFT) to the design of a three-axis rate-commanded automatic flight control system for an unmanned research vehicle (URV). The URV model used has seven inputs and three outputs derived from the small-angle perturbation equations of motion. Plant parameter uncertainty consists of six flight conditions derived from variations in the aircraft center of gravity, airspeed, and gross weight. A weighting matrix delts is used to post-multiply the plants for blending the seven effector inputs into three effective rate-command inputs and resulting in an effective plant Pe = P recursive. Second order effector models and first order feedback sensor models are included in the plant. A time- scaled recursive algorithm is used to transform the continuous plant models to the w'-plane thereby avoiding the numeric problems associated with an intermediate z-plane representation. All the URV plant elements are minimum phase (MP). The transformation produces, however, a sampling NMP zero and one other NMP zero due to the three pole excess actuator/sensor model elements. These NMP elements limit the available loop bandwidth (li(jv)). Standard QFT design is used, with plant templates P = (P(jv)) which quantitatively express the plant uncertainty. Due to the loop bandwidth limitations, only stability bounds are derived. The loop transmissions (li(jv)) are then shaped to achieve the maximum levels subject to the stability bounds. This is followed in the usual QFT manner with design of prefilters.
Robust Discrete Time Flight Control Of Uav With External Disturbances
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Author : Shuyi Shao
language : en
Publisher:
Release Date : 2021
Robust Discrete Time Flight Control Of Uav With External Disturbances written by Shuyi Shao and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021 with categories.
This book studies selected discrete-time flight control schemes for fixed-wing unmanned aerial vehicle (UAV) systems in the presence of system uncertainties, external disturbances and input saturation. The main contributions of this book for UAV systems are as follows: (i) the proposed integer-order discrete-time control schemes are based on the designed discrete-time disturbance observers (DTDOs) and the neural network (NN); and (ii) the fractional-order discrete-time control schemes are developed by using the fractional-order calculus theory, the NN and the DTDOs. The book offers readers a good understanding of how to establish discrete-time tracking control schemes for fixed-wing UAV systems subject to system uncertainties, external wind disturbances and input saturation. It represents a valuable reference guide for academic research on uncertain UAV systems, and can also support advanced / Ph.D. studies on control theory and engineering. .
Design Of A Flight Controller For An Unmanned Research Vehicle With Control Surface Failures Using Quantitative Feedback Theory
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Author :
language : en
Publisher:
Release Date : 1993
Design Of A Flight Controller For An Unmanned Research Vehicle With Control Surface Failures Using Quantitative Feedback Theory written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1993 with categories.
This thesis describes the application of the multiple-input multiple- output (MIMO) Quantitative Feedback Theory (QFT) design technique to the design of a digital flight control system for the Lambda Unmanned Research Vehicle (URV). The QFT technique allows the synthesis of a control system which is robust in the presence of structured plant uncertainties. Uncertainties considered in this design are the aircraft's plant variation within the flight envelope and the effects of damage to aircraft control surfaces. Mathematical models of control surface failure effects on aircraft dynamics are derived and used to modify an existing small perturbation model of the Lambda. The QFT technique is applied to design a control system utilizing aircraft pitch rate, roll rate and sideslip angle as feedback variables. The inherent cross-coupling rejection qualities of QFT and an aileron-rudder interconnect are utilized to design a control system which results in a coordinated flight. An outer-loop autopilot is then designed around the QFT controller to further assist turn coordination. Sensor noise effects on aircraft states are also analyzed. Quantitative feedback theory, Flight control system, Aircraft damage.
Quantitative Feedback Design Theory Qft
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Author : Isaac M. Horowitz
language : en
Publisher:
Release Date : 1993
Quantitative Feedback Design Theory Qft written by Isaac M. Horowitz and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1993 with Computers categories.
Scientific And Technical Aerospace Reports
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Author :
language : en
Publisher:
Release Date : 1994
Scientific And Technical Aerospace Reports written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1994 with Aeronautics categories.