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Flight Test and Handling Qualities Analysis of a Longitudinal Flight Control System Using Multiobjective Techniques

Flight Test and Handling Qualities Analysis of a Longitudinal Flight Control System Using Multiobjective Techniques
Author: John R. Anderson
Publisher:
Total Pages: 216
Release: 1998-03-01
Genre: Airplanes
ISBN: 9781423563341

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This thesis addresses the application of optimal, multiobjective control theory control theory to flight control design for the approach and landing phase of flight. Five flight control systems were designed using classical, H2, H infinity, and Mixed H2/H infinity methods. The MATLAB(Trade Mark) MUTOOLS(Trade Mark) and AFIT MXTOOLS toolboxes were used to produce the optimal, multiobjective designs. These designs were implemented for flight test on the Calspan VSS I Learjet, simulating the unstable longitudinal dynamics of an F-16 type aircraft. A limited handling qualities investigation was performed. Model following was used in the design phase to meet handling qualities specifications. The designs were successfully implemented and verified on the Calspan Learjet prior to flight test. An unmodeled aircraft mode was discovered just prior to flight test that made three of the designs slightly unstable. However, all of the designs achieved Level II or better Cooper-Harper handling qualities ratings for the landing tasks performed illustrating that the optimal multiobjective methods used can give acceptable or better handling qualities.


Criteria for Low-Speed Longitudinal Handling Qualities

Criteria for Low-Speed Longitudinal Handling Qualities
Author: H.A. Mooij
Publisher: Springer Science & Business Media
Total Pages: 151
Release: 2013-04-18
Genre: Technology & Engineering
ISBN: 9401711933

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In-fl ight simulation experiments performed in 1967 with a variable-stabil ity aircraft during the author's stay at Princeton University, motivated the study of handl ing characteristics of future transport aircraft with closed-loop fl ight control systems. In 1972, the first experiment took place at the National Aerospace Laboratory NLR, using one of its research aircraft. In anticipation of expected developments in (digital) fl ight control technology, the research programme following the first experiments was aimed at the establ ishment of quantitative handl ing qual ities criteria. An appreciable part of that programme has been sponsored by the Netherlands Agency for Aerospace Programs (Nederlands Instituut voor VI iegtuigontwikkel ing en Ruimtevaart) and the Department of Civil Aviation of the Netherlands (Rijksluchtvaartdienst). In 1981, a thorough review of the extensive and valuable data gathered was started. The result, presented in this book, was also included in the author's thesis for a Ph.D. degree of the Delft University of Technology. To introduce the reader to the multi-discipl inary field of handl ing qual ities research, introductory chapters are presented on longitudinal aircraft dynamics, closed-loop fl ight control systems using non-mechanical signal transmission, human pilot dynamics, hand I ing qual ities assessment techniques, and the present status of handl ing qual ity criteria.


Practical Methods for Aircraft and Rotorcraft Flight Control Design

Practical Methods for Aircraft and Rotorcraft Flight Control Design
Author: Mark Brian Tischler
Publisher:
Total Pages: 0
Release: 2017
Genre: Airplanes
ISBN: 9781624104435

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Reducing the theoretical methods of flight control to design practice, Practical Methods for Aircraft and Rotorcraft Flight Control Design: An Optimization-Based Approach compiles the authors' extensive experience and lessons learned into a single comprehensive resource for both academics and working flight control engineers.


Modern Flight Control Design, Implementation, and Flight Test

Modern Flight Control Design, Implementation, and Flight Test
Author: Phillip T. Edwards
Publisher:
Total Pages: 141
Release: 1997-03-01
Genre: Flight control
ISBN: 9781423567615

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This thesis addresses the application issues raised implementing flight control designs derived from optimal control theory and the challenges in obtaining acceptable handling qualities when using these techniques. Using the USAF TPS FCS project as the controller architecture, four controllers were designed using classical methods, and H2, H3, and mixed H2/H optimal control theory. These designs were implemented in the Calspan VSS II Learjet, simulating unstable aircraft longitudinal dynamics and a limited handling qualities flight test evaluation was performed. The design phase found the optimal control techniques, as applied, difficult to design to handling qualities specifications. The H2, H3 and mixed H2/H controllers were unstable and often contained high frequency poles, which were difficult to implement. The flight test rated the designs acceptable on approach, but no handling qualities level for approach was determined.


Aeronautical Engineering

Aeronautical Engineering
Author:
Publisher:
Total Pages: 538
Release: 1991
Genre: Aeronautics
ISBN:

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NASA SP.

NASA SP.
Author:
Publisher:
Total Pages: 654
Release: 1992
Genre: Aeronautics
ISBN:

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Theoretical and Experimental Investigation of Some New Longitudinal Handling Qualities Parameters

Theoretical and Experimental Investigation of Some New Longitudinal Handling Qualities Parameters
Author: Henry R. Jex
Publisher:
Total Pages: 108
Release: 1962
Genre: Adaptive control systems
ISBN:

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The systems-analysis theory of handling qualities (which describes the pilot's adaptive behavior in closed-loop operation by servo techniques, and relates his opinion-ratings to his adapted characteristics and the system performance) is used to reveal some important parameters associated with the numerator terms in the airframe longitudinal transfer function. The predictions are verified by five experienced test pilots operating in a fixed-base aircraft simulator. Four possible numerator effects on handling qualities are analyzed theoretically: short-period lead effect on pitch attitude tracking, static-to-short-period gain effects on attitude tracking, short-period lead effects on the control of short-period divergence, and numerator frequency and damping effects on altitude tracking. The results are correlated with other test work, and the implications of these results on future handling qualities research and specifications are discussed.


Analysis of Digital Flight Control Systems with Flying Qualities Applications

Analysis of Digital Flight Control Systems with Flying Qualities Applications
Author: Richard F. Whitbeck
Publisher:
Total Pages: 32
Release: 1978
Genre: Airplanes
ISBN:

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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.


Applied Mechanics Reviews

Applied Mechanics Reviews
Author:
Publisher:
Total Pages: 702
Release: 1988
Genre: Mechanics, Applied
ISBN:

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