Multivariable Techniques for High-Speed Research Flight Control Systems
Multivariable Techniques for High-Speed Research Flight Control Systems

Author: National Aeronautics and Space Administration (NASA)

Publisher: Createspace Independent Publishing Platform

Published: 2018-06-27

Total Pages: 294

ISBN-13: 9781721931668

DOWNLOAD EBOOK

This report describes the activities and findings conducted under contract with NASA Langley Research Center. Subject matter is the investigation of suitable multivariable flight control design methodologies and solutions for large, flexible high-speed vehicles. Specifically, methodologies are to address the inner control loops used for stabilization and augmentation of a highly coupled airframe system possibly involving rigid-body motion, structural vibrations, unsteady aerodynamics, and actuator dynamics. Design and analysis techniques considered in this body of work are both conventional-based and contemporary-based, and the vehicle of interest is the High-Speed Civil Transport (HSCT). Major findings include: (1) control architectures based on aft tail only are not well suited for highly flexible, high-speed vehicles, (2) theoretical underpinnings of the Wykes structural mode control logic is based on several assumptions concerning vehicle dynamic characteristics, and if not satisfied, the control logic can break down leading to mode destabilization, (3) two-loop control architectures that utilize small forward vanes with the aft tail provide highly attractive and feasible solutions to the longitudinal axis control challenges, and (4) closed-loop simulation sizing analyses indicate the baseline vane model utilized in this report is most likely oversized for normal loading conditions. Newman, Brett A. Langley Research Center NAS1-19858; RTOP 537-07-24-23

Proceedings of the Workshop on Multivariable Control Systems
Proceedings of the Workshop on Multivariable Control Systems

Author: Michael A. Masi

Publisher:

Published: 1983

Total Pages: 676

ISBN-13:

DOWNLOAD EBOOK

The workshop was organized and conducted by the Control Techniques Group, Flight Control Division, Flight Dynamics Laboratory, as part of an ongoing effort in flight control specification/criteria development. The workshop focused on the results of applying multivariable control techniques to the development of flight control systems for present day aircraft. This report contains condensed versions of the five papers presented at the workshop: (1) Multivariable Control Laws for the AFTI/F-16, (2) Design of a Complete Multivariable Digital Flight Control System, (3)Digital Multivariable Tracker Control Laws for the C-141-A Starlifter Aircraft; (4) High-Gain Error Actuated Flight Control Systems for Continuous Linear Multivariable Plants, and (5) Reconfigurable Digital Control Laws for the A-7D DIGITAC II Aircraft With Failed Primary Control Surfaces.

Robust Multivariable Flight Control
Robust Multivariable Flight Control

Author: Richard J. Adams

Publisher: Springer Science & Business Media

Published: 2012-12-06

Total Pages: 175

ISBN-13: 1447121112

DOWNLOAD EBOOK

Manual flight control system design for fighter aircraft is one of the most demanding problems in automatic control. Fighter aircraft dynamics generally have highly coupled uncertain and nonlinear dynamics. Multivariable control design techniques offer a solution to this problem. Robust Multivariable Flight Control provides the background, theory and examples for full envelope manual flight control system design. It gives a versatile framework for the application of advanced multivariable control theory to aircraft control problems. Two design case studies are presented for the manual flight control of lateral/directional axes of the VISTA-F-16 test vehicle and an F-18 trust vectoring system. They demonstrate the interplay between theory and the physical features of the systems.

Robust Multivariable Control of Aerospace Systems
Robust Multivariable Control of Aerospace Systems

Author: Declan Bates

Publisher: IOS Press

Published: 2002

Total Pages: 220

ISBN-13:

DOWNLOAD EBOOK

Classical design and analysis techniques, many of which date back to the 1950's, are still predominantly used in the aerospace industry for the design and analysis of automatic flight control and aero-engine control systems. The continued success and popularity of these techniques is particularly impressive considering the radical advances in aircraft and spacecraft design and avionics technology made over this period. Clearly, an understanding of both the advantages and limitations of these methods is essential in order to properly evaluate the likely usefulness of more modern techniques for the design and analysis of aerospace control systems. One of the themes of this book is that the multivariable robust control methods it describes are logical and natural extensions of the more classical methods, and not replacements for them. It is assumed that readers of this publication are already familiar with classical flight control techniques. Emphasis is on the philosophy, advantages and limitations of the classical approach to flight control system design and analysis. Abstracted in Inspec

Investigation of Inner Loop Flight Control Strategies for High-Speed Research
Investigation of Inner Loop Flight Control Strategies for High-Speed Research

Author: National Aeronautics and Space Administration (NASA)

Publisher: Createspace Independent Publishing Platform

Published: 2018-06-13

Total Pages: 172

ISBN-13: 9781721086962

DOWNLOAD EBOOK

This report describes the activities and findings conducted under contract NAS1-19858 with NASA Langley Research Center. Subject matter is the investigation of suitable flight control design methodologies and solutions for large, flexible high-speed vehicles. Specifically, methodologies are to address the inner control loops used for stabilization and augmentation of a highly coupled airframe system possibly involving rigid-body motion, structural vibrations, unsteady aerodynamics, and actuator dynamics. Techniques considered in this body of work are primarily conventional-based, and the vehicle of interest is the High-Speed Civil Transport (HSCT). Major findings include 1) current aeroelastic vehicle modeling procedures require further emphasis and refinement, 2) traditional and nontraditional inner loop flight control strategies employing a single feedback loop do not appear sufficient for highly flexible HSCT class vehicles, 3) inner loop flight control systems will, in all likelihood, require multiple interacting feedback loops, and 4) Ref. H HSCT configuration presents major challenges to designing acceptable closed-loop flight dynamics. Newman, Brett and Kassem, Ayman Langley Research Center NAS1-19858; RTOP 537-07-24-01

Scientific and Technical Aerospace Reports
Scientific and Technical Aerospace Reports

Author:

Publisher:

Published: 1995

Total Pages: 488

ISBN-13:

DOWNLOAD EBOOK

Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.