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  • 1
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    A unified approach to the vehicle-merging problem (1969)
    Elsevier
    Details
    Publication Date: 1969-04-01
    Print ISSN: 0041-1647
    Electronic ISSN: 1878-3821
    Topics: Architecture, Civil Engineering, Surveying
    Published by Elsevier
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    PAPER CURRENT
  • 2
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    Robust control for uncertain structures (1991)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Viewgraphs on robust control for uncertain structures are presented. Topics covered include: robust linear quadratic regulator (RLQR) formulas; mismatched LQR design; RLQR design; interpretations of RLQR design; disturbance rejection; and performance comparisons: RLQR vs. mismatched LQR.
    Keywords: STRUCTURAL MECHANICS
    Type: The 3rd Annual Controlled Structures Technology Symposium; 17 p
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Design of feedback control systems for stable plants with saturating actuators (1988)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A systematic control design methodology is introduced for multi-input/multi-output stable open loop plants with multiple saturations. This new methodology is a substantial improvement over previous heuristic single-input/single-output approaches. The idea is to introduce a supervisor loop so that when the references and/or disturbances are sufficiently small, the control system operates linearly as designed. For signals large enough to cause saturations, the control law is modified in such a way as to ensure stability and to preserve, to the extent possible, the behavior of the linear control design. Key benefits of the methodology are: the modified compensator never produces saturating control signals, integrators and/or slow dynamics in the compensator never windup, the directional properties of the controls are maintained, and the closed loop system has certain guaranteed stability properties. The advantages of the new design methodology are illustrated in the simulation of an academic example and the simulation of the multivariable longitudinal control of a modified model of the F-8 aircraft.
    Keywords: CYBERNETICS
    Type: NASA-CR-182613 , NAS 1.26:182613 , LIDS-P-1756
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    A method for designing robust multivariable feedback systems (1988)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A new methodology is developed for the synthesis of linear, time-invariant (LTI) controllers for multivariable LTI systems. The aim is to achieve stability and performance robustness of the feedback system in the presence of multiple unstructured uncertainty blocks; i.e., to satisfy a frequency-domain inequality in terms of the structured singular value. The design technique is referred to as the Causality Recovery Methodology (CRM). Starting with an initial (nominally) stabilizing compensator, the CRM produces a closed-loop system whose performance-robustness is at least as good as, and hopefully superior to, that of the original design. The robustness improvement is obtained by solving an infinite-dimensional, convex optimization program. A finite-dimensional implementation of the CRM was developed, and it was applied to a multivariate design example.
    Keywords: CYBERNETICS
    Type: NASA-CR-182459 , NAS 1.26:182459 , LIDS-P-1749
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Robust linear quadratic designs with respect to parameter uncertainty (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: The authors derive a linear quadratic regulator (LQR) which is robust to parametric uncertainty by using the overbounding method of I. R. Petersen and C. V. Hollot (1986). The resulting controller is determined from the solution of a single modified Riccati equation. It is shown that, when applied to a structural system, the controller gains add robustness by minimizing the potential energy of uncertain stiffness elements, and minimizing the rate of dissipation of energy through uncertain damping elements. A worst-case disturbance in the direction of the uncertainty is also considered. It is proved that performance robustness has been increased with the robust LQR when compared to a mismatched LQR design where the controller is designed on the nominal system, but applied to the actual uncertain system.
    Keywords: CYBERNETICS
    Type: In: 1992 American Control Conference, 11th, Chicago, IL, June 24-26, 1992, Proceedings. Vol. 4 (A93-22776 07-63); p. 2905-2910.
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Nonlinear and adaptive control (1989)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The primary thrust of the research was to conduct fundamental research in the theories and methodologies for designing complex high-performance multivariable feedback control systems; and to conduct feasibiltiy studies in application areas of interest to NASA sponsors that point out advantages and shortcomings of available control system design methodologies.
    Keywords: CYBERNETICS
    Type: NASA-CR-180088 , NAS 1.26:180088 , LIDS-FR-1891 , MIT-OSP-95178
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    Design of feedback control systems for unstable plants with saturating actuators (1988)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: A new control design methodology is introduced for multi-input/multi-output systems with unstable open loop plants and saturating actuators. A control system is designed using well known linear control theory techniques and then a reference prefilter is introduced so that when the references are sufficiently small, the control system operates linearly as designated. For signals large enough to cause saturations, the control law is modified in such a way to ensure stability and to preserve, to the extent possible, the behavior of the linear control design. Key benefits of this methodology are: the modified feedback system never produces saturating control signals, integrators and/or slow dynamics in the compensator never windup, the directionaL properties of the controls are maintained, and the closed loop system has certain guaranteed stability properties. The advantages of the new design methodology are illustrated in the simulation of an approximation of the AFTI-16 (Advanced Fighter Technology Integration) aircraft multivariable longitudinal dynamics.
    Keywords: ELECTRONICS AND ELECTRICAL ENGINEERING
    Type: NASA-CR-183392 , NAS 1.26:183392 , Symposium on Nonlinear Control Systems Design; Jan 01, 1989; Cambridge, MA; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 8
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    Stability and robustness of slowly time-varying linear systems (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A well-known result for finite-dimensional time-varying linear systems is that if each `frozen time' is stable, then the time-varying system is stable for sufficiently slow time-variations. These results are reviewed and extended to a class of Volterra integrodifferential equations, specifically, differential equations with a convolution operator in the right-hand-side. The results are interpreted in the context of robustness of time-varying linear systems with special emphasis on analysis of gain-scheduled control systems.
    Keywords: CYBERNETICS
    Type: IEEE Conference on Decision and Control; Dec 09, 1987 - Dec 11, 1987; Los Angeles, CA; United States
    Format: text
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    NASA TECHNICAL REPORTS
  • 9
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    A frequency-domain estimator for use in adaptive control systems (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The paper presents a frequency-domain estimator which can identify both a nominal model of a plant as well as a frequency-domain bounding function on the modeling error associated with this nominal model. This estimator, which is called a robust estimator, can be used in conjunction with a robust control-law redesign algorithm to form a robust adaptive controller.
    Keywords: CYBERNETICS
    Type: 1987 American Control Conference; Jun 10, 1987 - Jun 12, 1987; Minneapolis, MN; United States
    Format: text
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    NASA TECHNICAL REPORTS
  • 10
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    Gain scheduling - Potential hazards and possible remedies (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A common gain scheduling rule-of-thumb is to schedule on a slow variable. In this work, it is shown how current gain scheduling practice is necessarily limited to slow variations in the scheduling variable. These limitations are revealed to be consequences of fundamental control concepts. Furthermore, it is shown how a formulation of the gain scheduling procedure can lead toward ultimately removing these restrictions.
    Keywords: CYBERNETICS
    Type: 1991 American Control Conference; Jun 26, 1991 - Jun 28, 1991; Boston, MA; United States
    Format: text
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    NASA TECHNICAL REPORTS
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