Robust eigenstructure assignment with flight control application.
Item
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Title
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Robust eigenstructure assignment with flight control application.
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Identifier
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AAI9304748
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identifier
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9304748
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Creator
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Yu, Wangling.
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Contributor
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Adviser: Kenneth M. Sobel
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Date
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1992
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Language
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English
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Publisher
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City University of New York.
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Subject
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Engineering, Electronics and Electrical | Engineering, Aerospace
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Abstract
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Robust eigenstructure assignment algorithms are developed and applied to flight control design. The design problems which are considered include a stability augmentation system for the lateral dynamics of the L-1011 aircraft, the AFTI F-16 pitch pointing/vertical translation maneuver, and an autopilot for the lateral dynamics of the Extended Medium Range Air to Air Technology (EMRAAT) missile. The application of robust eigenstructure assignment to the EMRAAT missile is quite interesting because the lateral dynamics does not have a well defined dutch roll mode. Therefore, eigenstructure assignment is utilized not only for mode decoupling, but also for creating distinctly separate dutch roll and roll mode.;The design methods combine eigenstructure assignment with a condition for the robust stability of a linear time invariant system which is subject to linear time varying structured state space uncertainty. Robust eigenstructure assignment design method I is based upon optimizing the robust sufficient condition while constraining the dominant eigenvalues of the system to lie within chosen regions. The robust stability condition is extended to a performance robustness condition in which the closed loop eigenvalues of the LTI system are guaranteed to lie within a chosen damping-settling time region for all specified time invariant structured state space uncertainty.;In collaboration with a colleague, a new sufficient condition is proposed for the robust stability of an LTI system subject to time varying structured state space uncertainty. A robust controller is designed for the lateral dynamics of the EMRAAT missile by minimizing the integrated roll rate with constraints on the real part of the dutch roll and roll mode eigenvalues, the aileron and rudder deflection rates, and the new sufficient condition for robust stability. This new robust design has an improved transient response as compared to an eigenstructure assignment design using an orthogonal projection.
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Type
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dissertation
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Source
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PQT Legacy CUNY.xlsx
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degree
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Ph.D.
