Evaluation of Numerator Lead Effects on Aircraft Handling Qualities

Evaluation of Numerator Lead Effects on Aircraft Handling Qualities

Author: David W. Eidsaune

Publisher:

Published: 1986

Total Pages: 137

ISBN-13:

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Results of a combined analytical/flight test evaluation to investigate the effects of short period zero (T theta 2) on aircraft handling qualities are presented. Two optimal pilot models were used for the analytical portion. 1/T theta 2 was varied from 0.1 to 10 for each 4 different short period configurations. Flight testing was accomplished in the variable stability NT-33A aircraft, over a range of 1/T theta 2 values at one short period configuration. A pitch tracking task was used to generate RMS pitch errors for both the analytical and flight test phase. Cooper-Harper ratings were also collected during the flight test. Analytical results showed similar trends for all short period configurations, with pilot tracking task performance degrading at low 1/T theta 2 values. The bandwidth criterion was of limited use in predicting handling qualities levels based on T theta 2 variations alone. DC gain variations produced minimal differences in pilot performance. Overall evaluation results indicate that T theta 2 placement is an important factor in short period handling qualities and should be included in future revisions to MIL-F-8785C.


Masters Theses in the Pure and Applied Sciences

Masters Theses in the Pure and Applied Sciences

Author: Wade H. Shafer

Publisher: Springer Science & Business Media

Published: 2012-12-06

Total Pages: 411

ISBN-13: 1461305993

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Masters Theses in the Pure and Applied Sciences was first conceived, published, and disseminated by the Center for Information and Numerical Data Analysis and Synthesis (CINDAS) * at Purdue University in 1 957, starting its coverage of theses with the academic year 1955. Beginning with Volume 13, the printing and dissemination phases of the activity were transferred to University Microfilms/Xerox of Ann Arbor, Michigan, with the thought that such an arrangement would be more beneficial to the academic and general scientific and technical community. After five years of this joint undertaking we had concluded that it was in the interest of all con cerned if the printing and distribution of the volumes were handled by an interna tional publishing house to assure improved service and broader dissemination. Hence, starting with Volume 18, Masters Theses in the Pure and Applied Sciences has been disseminated on a worldwide basis by Plenum Publishing Cor poration of New York, and in the same year the coverage was broadened to include Canadian universities. All back issues can also be ordered from Plenum. We have reported in Volume 32 (thesis year 1987) a total of 12,483 theses titles from 22 Canadian and 176 United States universities. We are sure that this broader base for these titles reported will greatly enhance the value of this important annual reference work. While Volume 32 reports theses submitted in 1987, on occasion, certain univer sities do report theses submitted in previous years but not reported at the time.


Aeronautical Engineering

Aeronautical Engineering

Author:

Publisher:

Published: 1987

Total Pages: 782

ISBN-13:

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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).


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:

Published: 1962

Total Pages: 108

ISBN-13:

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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.