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  • 1
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    Control of time variable, nonlinear multivariable systems using Liapunov's direct method. (1966)
    In:  Other Sources
    Details
    Publication Date: 2019-05-30
    Description: Liapunov method synthesis of time variable nonlinear multivariable systems, deriving simplified control law for tracking of linear noninteracting model
    Keywords: ELECTRONICS
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  • 2
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    Control of time variable, nonlinear multivariable systems using Liapunov's direct method (1966)
    In:  CASI
    Details
    Publication Date: 2019-05-29
    Description: Controlling time variable nonlinear multivariable systems using Lipunous direct method
    Keywords: ELECTRONICS
    Type: NASA-CR-407
    Format: application/pdf
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  • 3
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    Use of a coordinate transformation in the incremental phase plane. (1964)
    In:  Other Sources
    Details
    Publication Date: 2019-05-22
    Description: Intersample oscillations in sampled data control systems identified, using coordinate transformation
    Keywords: ELECTRONIC EQUIPMENT
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  • 4
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    SENSITIVITY IN SAMPLED-DATA SYSTEMS (1962)
    In:  CASI
    Details
    Publication Date: 2019-05-11
    Description: Sensitivity in sampled-data handling systems
    Keywords: ELECTRONIC EQUIPMENT
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  • 5
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    SENSITIVITY IN SAMPLED-DATA SYSTEMS (1963)
    In:  Other Sources
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    Publication Date: 2019-05-10
    Description: Sensitivity of sampled-data systems to plant variations and load disturbances
    Keywords: CHEMISTRY
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  • 6
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    An adaptive observer for single-input single-output linear systems (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: It is shown that the full order adaptive observer for single input, single output, observable, continuous, stable, linear differential systems in the absence of a deterministic or random disturbance vector guarantees the vanishing of observation error, regardless of the size of the constant or slowly varying parameter ignorance. The observer parameters are directly changed in a Liapunov adaptive way so as to eventually yield the unknown full order Luenberger observer. The observer poles throughout may be placed freely in the stable region and no derivatives are required in the adaptive law.
    Keywords: MATHEMATICS
    Type: NASA-CR-129193 , TR-72-10
    Format: application/pdf
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  • 7
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    Survey of adaptive control using Liapunov design (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A survey was made of the literature devoted to the synthesis of model-tracking adaptive systems based on application of Liapunov's second method. The basic synthesis procedure is introduced and a critical review of extensions made to the theory since 1966 is made. The extensions relate to design for relative stability, reduction of order techniques, design with disturbance, design with time variable parameters, multivariable systems, identification, and an adaptive observer.
    Keywords: ELECTRONICS
    Type: NASA-CR-129175 , TR-72-7
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  • 8
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    A note on pole assignment (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: It is shown that for a controllable, linear time invariant multivariable system at least max (m,p) poles can be assigned arbitrarily. In certain cases more than max (m,p) oikes can be assigned. This result is particularly useful in designing systems for high integrity in the event of transducer failure. In such an event this design takes advantage of the unequal number of inputs and outputs so as to assure no loss in pole assignability.
    Keywords: ELECTRONIC EQUIPMENT
    Type: NASA-CR-127763 , TR-72-2
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  • 9
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    Pole placement with constant gain output feedback (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Given a linear time invariant multivariable system with m inputs and p outputs, it was shown that p closed loop poles of the system can be preassigned arbitrarily using constant gain output feedback provided (A circumflex, B circumflex) is controllable. These data show that if (A circumflex, B circumflex, C circumflex) is controllable and observable, and Rank B circumflex = m, Rank C circumflex = p, then max (m,p) poles of the system can be assigned arbitarily using constant gain output feedback. Further, it is shown that in some cases more than max (m,p) poles can be arbitrarily assigned. A least square design technique is outlined to approximate the desired pole locations when it is not possible to place all the poles.
    Keywords: ELECTRONICS
    Type: NASA-CR-127446 , TR-72-3
    Format: application/pdf
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  • 10
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    Effects of incomplete adaption and disturbance in adaptive control (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: This investigation focused attention on the fact that the synthesis of adaptive control systems has often been discussed in the framework of idealizations which may represent over simplifications. A condition for boundedness of the tracking error has been derived for the case in which incomplete adaption and disturbance are present. When using Parks' design it is shown that instability of the adaptive gains can result due to the presence of disturbance. The theory has been applied to a nontrivial example in order to illustrate the concepts involved.
    Keywords: ELECTRONICS
    Type: NASA-CR-126379 , TR-72-1
    Format: application/pdf
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