Download or read book Flight Control System for the CRCA Control Reconfigurable Combat Aircraft Using a Command Generator Tracker with PI Proportional Plus Integral Feedback and Kalman Filter written by Steven S. Payson and published by . This book was released on 1989 with total page 154 pages. Available in PDF, EPUB and Kindle. Book excerpt: This research develops an integrated software design package useful in the synthesis of CGT/PI/KF control systems, and uses this software package to design and evaluate a longitudinal flight control system for the Control Reconfigurable Combat Aircraft (CRCA). The software package, called CGTPIKE and built with MATRIXx commands, allows for the synthesis and evaluation of a Command Generator Tracker (CGT) which provides inputs to the system and acts as a pre-compensator, and a regulator with proportional plus integral (PI) feedback which forces the system outputs to mimic the model output. The software also allows the incorporation of a Kalman filter for estimation of the system states. Certainty equivalence can be invoked by adopting the LQG assumptions, thereby allowing the Kalman filter to be designed independently of the CGT/PI controller. The total CGT/PI/KF controller can then be evaluated and the design refined. CGTPIKF is an interactive, menu-driven CAD package which can be used in the development of any CGT/PI/KF control system, regardless of application. A flight control system was designed for the CRCA air combat mode (ACM) entry using CGTPIKF. This control system was designed to force the aircraft to emulate a first order response in pitch rate. Theses. (rh).
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1989 with total page 1134 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Technical Reports Awareness Circular TRAC written by and published by . This book was released on 1989-05 with total page 594 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Flight Control System for the CRCA Using a Command Generator Tracker with Pi Feedback and Kalman Filter written by Steven Spencer Payson (CAPT, USAF.) and published by . This book was released on 1989 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Aeronautical Engineering written by and published by . This book was released on 1991 with total page 568 pages. Available in PDF, EPUB and Kindle. Book excerpt: A selection of annotated references to unclassified reports and journal articles that were introduced into the NASA scientific and technical information system and announced in Scientific and technical aerospace reports (STAR) and International aerospace abstracts (IAA).
Download or read book Discrete Proportional Plus Integral PI Multivariable Control Laws for the Control Reconfigurable Combat Aircraft CRCA written by and published by . This book was released on 1989 with total page 158 pages. Available in PDF, EPUB and Kindle. Book excerpt: Multivariable control laws developed by Dr. Brian Porter of the University of Salford, England are used to successfully perform maneuvering tracking tasks with the NASA/Grumman Control Reconfigurable Combat Aircraft (CRCA). Porter's method is used to design discrete Proportional plus Integral (PI) control laws. Output and selected state rate feedback are used. The results in three no failure flight conditions show robust tracking control of the CRCA for five selected maneuvers. Single failures are introduced to test the ability of the fixed-gain designs to successfully control the aircraft and perform the maneuvers. The time responses show that discrete PI control law can make the CRCA successfully perform all five maneuvers for two of the three control surface failures investigated in two of the three point designs. The step response PI control law results in stable control for only one of three failure situations. Keywords: Control theory; Flight control systems; Multivariable control; Adaptive control systems. (jes).
Download or read book Government Reports Announcements Index written by and published by . This book was released on 1989 with total page 1056 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Aeronautical Engineering A Cumulative Index to a Continuing Bibliography supplement 248 written by and published by . This book was released on 1990 with total page 532 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Reconfigurable Flight Control Designs with Application to the X 33 Vehicle written by John J. Burken and published by . This book was released on 1999 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt: Two methods for control system reconfiguration have been investigated. The first method is a robust servomechanism control approach (optimal tracking problem) that is a generalization of the classical proportional-plus-integral control to multiple input-multiple output systems. The second method is a control-allocation approach based on a quadratic programming formulation. A globally convergent fixed-point iteration algorithm has been developed to make onboard implementation of this method feasible. These methods have been applied to reconfigurable entry flight control design for the X-33 vehicle. Examples presented demonstrate simultaneous tracking of angle-of-attack and roll angle commands during failures of the right body flap actuator. Although simulations demonstrate success of the first method in most cases, the control-allocation method appears to provide uniformly better performance in all cases.
Download or read book Discrete Proportional Plus Integral PI Multivariable Control Laws for the Control Reconfigurable Combat Aircraft CRCA written by Jamie L. Foelker (CAPT, USAF.) and published by . This book was released on 1989 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Government reports annual index written by and published by . This book was released on 199? with total page 1134 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Multivariable Control Law Design for the Control Reconfigurable Combat Aircraft CRCA written by Daryl Hammond and published by . This book was released on 1988 with total page 422 pages. Available in PDF, EPUB and Kindle. Book excerpt: Typically, control law analysis and design for an aircraft include separating the longitudinal and lateral equations of motion and designing control laws for each separate motion. The simplifying assumptions are often valid and do not adversely affect the analysis and design when aerodynamic cross-coupling is minimal. The Control Reconfigurable Combat Aircraft (CRCA) design includes an all-flying canard with 30 degrees of dihedral angle which prevents the normal separation of lateral and longitudinal equations because of high aerodynamic cross-coupling. The multivariable control law design used in this thesis incorporates the high gain error actuated Proportional plus Integral (PI) controller developed by Professor Brian Porter of the University of Salford, England. Control law development and simulation are preformed using the computer aided design program called mat. Two successful fixed gain controller design methods and an adaptive controller design are demonstrated. The three control surfaces on each wing are operated together, so they are treated in this thesis as one control effector. Thus, the five CRCA control inputs for this design consist of two canards, left trailing edge flaperon, right trailing edge flaperon, and rudder. An adaptive controller design, using a recursive least squares (RLS) parameter estimation algorithm, is developed for a self-tuning control system. Theses. (SDW).
Download or read book Design of Advanced Digital Flight Control Systems Via Command Generator Tracker CGT Synthesis Methods written by Richard M. Floyd and published by . This book was released on 1981 with total page 246 pages. Available in PDF, EPUB and Kindle. Book excerpt: CGTPIF is a controller design program which executes interactively. Three design paths are offered: (1) design of a Proportional-plus-Integral (PI) regulator via linear-quadratic (LQ) methodology; (2) design of a Command Generator Tracker, either open-loop (CGT) or closed-loop (CGT/PI); and (3) design of a Kalman filter (KF). These three designs are components of a final controller implemented as a Command Generator Tracker, with an inner-loop proportional-plus-integral regulator, and a Kalman filter for state estimation (CGT/PI/KF). For each design path there is a corresponding set of routines to evaluate the quality of the design achieved. The program is written in FORTRAN IV and consists of about 2500 lines of source code. In addition, numerous routines are employed from a library of matrix routines described in Reference 24. (Author).
Download or read book An LQG Up and Away Flight Control Design for the STOL F 15 Aircraft written by Robert A. Houston and published by . This book was released on 1985 with total page 243 pages. Available in PDF, EPUB and Kindle. Book excerpt: A robust controller for the STOL F-15 aircraft is developed using the LQG/LTR (linear system model, quadratic cost, gaussian models of uncertainty used for controller synthesis, with loop transfer recovery techniques of tuning the filter in the loop for control robustness enhancement) methods. Full state feedback controllers are synthesized using CGT/PI (Command Generator Tracking feedforward compensator to provide direct incoporation of flying qualities into the design process, with proportional plus integral feedback control) synthesis, using implicit model following techniques to improve full state robustness characteristics. Finally, a Kalman filter is used to replace the unrealistic assumption of full state availability with estimated states, using a LTR scheme to recover as much full state robustness characteristics as possible. (Thesis) Keywords: Optimal Control, Model-Following Control, Robustness, Proportional-Integral Control, STOL Aircraft Control, Flight Control Systems.
Download or read book Design of Advanced Digital Flight Control Systems Via Command Generator Tracker CGT Synthesis Methods written by Richard M. Floyd and published by . This book was released on 1981 with total page 226 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study develops a computer program for interactive execution to aid in the design of Command Generator Tracker control systems employing Proportional-plus-Integral inner-loop controllers and Kalman Filters for state estimation (CGT/PI/KF controllers). Design parameters are specified in the continuous-time domain and the computer program obtains the corresponding discrete-time parameters and determines a direct digital design for sampled-data implementation. Designs are based upon the Linear system mode, Quadratic cost, and Gaussian noise process (LQG) assumptions of optimal control theory. The report discusses the theoretical background and applications of optimal model-following designs which preceded the CGT theory. A development of the CGT/PI/KF controller theory is presented, and performance evaluation tools for the controller design are discussed. Following a brief description of the computer program developed, results of applying it to example aircraft-related controller design problems are presented and discussed.
Download or read book Adaptive and Reconfigurable Flight Control written by Huang Yih-Shiun and published by . This book was released on 2001-03-01 with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt: An indirect adaptive and reconfigurable flight control system is developed. The three-module controller consists of: (1) a system identification module, (2) a parameter estimate smoother, and (3) a proportional and integral compensator for tracking control. Specifically: (1) The identification of a linear discrete-time control system's open-loop gain is addressed. The classical Kalman filter theory for linear control systems is extended and the control system's state and loop gain are jointly estimated on-line. Explicit formulae for the loop gain's estimate and estimation error covariance are derived. The estimate is unbiased and the predicted covariance is reliable. (2) An adaptive smoother is developed to reduce the fluctuations automatically in the gain estimate, and bursting, caused by instances of poor excitation. (3) Special attention is given to the design of a proportional and integral tracking controller. The outputs of the system identification and gain smoother modules are used to adjust the tracking controller's gain continuously in order to compensate for a possible reduction in the loop gain due to control surface area loss, thus achieving the benefits of adaptive and reconfigurable control. The performance of the adaptive and reconfigurable controller in the face of a simulated control surface failure is examined in carefully designed experiments. The adaptive controller developed in this dissertation and illustrated in a flight control Context is applicable to a wide range of control problems.
Download or read book A Feasibility Study of Self learning Adaptive Flight Control for High Performance Aircraft written by Stephen G. Hoppe and published by . This book was released on 1967 with total page 258 pages. Available in PDF, EPUB and Kindle. Book excerpt: A study of the feasibility of a self-learning adaptive system for the flight control of high performance aircraft has been performed. A flight control system was developed for the investigation of the stability augmentation of the longitudinal axis of the F101B aircraft using self-learning adaptive control. The learning adaptive controller developed employs a three-loop concept. The innermost loop comprises a linear feedback control system in which a set of control gains is adjusted by a second (adaptive) loop employing a parameter identifier and a trainable function generator (automation). The automation provides the correct values of feedback gain in response to patterns derived from the identified aircraft parameters. The third loop (the learning loop) measures control system performance, and continually retrains the automation to improve the performance. Experiments were performed with a digital simulation of the aircraft and the learning adaptive control system. Results of the experiments indicate that learning adaptive control is feasible. However, a number of significant technical problems must be overcome prior to the use of such a control system in tactical aircraft. Studies of sensitivity must be performed to assess the effect of small perturbations in the identification parameters on system performance. Extended studies of property extraction from the identified parameters is required, and means for further simplifying the control structure is of importance in a real system. (Author).
