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Initial VTOL Flight Control Design Criteria Development - Discussion of Selected Handling Qualities Topics

Initial VTOL Flight Control Design Criteria Development - Discussion of Selected Handling Qualities Topics
Author: John Kroll (Jr.)
Publisher:
Total Pages: 76
Release: 1968
Genre: Helicopters
ISBN:

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"This report presents a series of discussions on selected topics related to the development of VTOL flying qualities criteria. The topics were chosen on the basis of their importance to flying qualities and the potential significance to the Air Force VTOL Integrated Flight Control System (VIFCS) program. The treatment given to the selected topics was aimed at identifying those areas that require further study and research within the scope of the VIFCS program. -- page iii.


Aircraft Dynamics and Automatic Control

Aircraft Dynamics and Automatic Control
Author: Duane T. McRuer
Publisher: Princeton University Press
Total Pages: 809
Release: 2014-07-14
Genre: Technology & Engineering
ISBN: 1400855985

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Aeronautical engineers concerned with the analysis of aircraft dynamics and the synthesis of aircraft flight control systems will find an indispensable tool in this analytical treatment of the subject. Approaching these two fields with the conviction that an understanding of either one can illuminate the other, the authors have summarized selected, interconnected techniques that facilitate a high level of insight into the essence of complex systems problems. These techniques are suitable for establishing nominal system designs, for forecasting off-nominal problems, and for diagnosing the root causes of problems that almost inevitably occur in the design process. A complete and self-contained work, the text discusses the early history of aircraft dynamics and control, mathematical models of linear system elements, feedback system analysis, vehicle equations of motion, longitudinal and lateral dynamics, and elementary longitudinal and lateral feedback control. The discussion concludes with such topics as the system design process, inputs and system performance assessment, and multi-loop flight control systems. Originally published in 1974. The Princeton Legacy Library uses the latest print-on-demand technology to again make available previously out-of-print books from the distinguished backlist of Princeton University Press. These editions preserve the original texts of these important books while presenting them in durable paperback and hardcover editions. The goal of the Princeton Legacy Library is to vastly increase access to the rich scholarly heritage found in the thousands of books published by Princeton University Press since its founding in 1905.


Longitudinal-Control Design Approach for High-Angle-Of-Attack Aircraft

Longitudinal-Control Design Approach for High-Angle-Of-Attack Aircraft
Author: National Aeronautics and Space Adm Nasa
Publisher:
Total Pages: 36
Release: 2018-10-20
Genre:
ISBN: 9781729008287

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This paper describes a control synthesis methodology that emphasizes a variable-gain output feedback technique that is applied to the longitudinal channel of a high-angle-of-attack aircraft. The aircraft is a modified F/A-18 aircraft with thrust-vectored controls. The flight regime covers a range up to a Mach number of 0.7; an altitude range from 15,000 to 35,000 ft; and an angle-of-attack (alpha) range up to 70 deg, which is deep into the poststall region. A brief overview is given of the variable-gain mathematical formulation as well as a description of the discrete control structure used for the feedback controller. This paper also presents an approximate design procedure with relationships for the optimal weights for the selected feedback control structure. These weights are selected to meet control design guidelines for high-alpha flight controls. Those guidelines that apply to the longitudinal-control design are also summarized. A unique approach is presented for the feed-forward command generator to obtain smooth transitions between load factor and alpha commands. Finally, representative linear analysis results and nonlinear batch simulation results are provided. Ostroff, Aaron J. and Proffitt, Melissa S. Langley Research Center RTOP 505-64-30-01...


Application of Mark III - SOC to Multivariable Control Problems. Part I. High-Gain Decoupling Control Applied to the Longitudinal Axis of the XV-4B VTOL Aircraft

Application of Mark III - SOC to Multivariable Control Problems. Part I. High-Gain Decoupling Control Applied to the Longitudinal Axis of the XV-4B VTOL Aircraft
Author: Yoon S. Lee
Publisher:
Total Pages: 294
Release: 1968
Genre:
ISBN:

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This document describes synthesis technique for designing a high-gain decoupling controller for direct-lift control of the longitudinal axis of the XV-4B VTOL aircraft. The technique produces a control system which reduces pilot workload during the critical hover and transition modes of flight. The control system can be modified to accommodate a variety of feedback signals, is insensitive to vehicle parameter variations, and requires measurement only of those responses which are to be decoupled. An application of the synthesis technique to a control system employing MARK III Probability State Variable (PSV) devices is described. (Author).