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  • 1975-1979  (6)
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  • 1
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    Eigenvalue/eigenvector assignment using output feedback (1978)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: The problem of pole-assignment in a linear time-invariant multivariable system using output feedback is considered. New sufficient conditions are derived to assign an almost arbitrary set of min (n, m+r-1) distinct eigenvalues, where n, m, and r are the number of states, inputs, and outputs, respectively. The analysis also highlights the freedom in selection of closed-loop eigenvectors which can be used for response shaping.
    Keywords: CYBERNETICS
    Type: IEEE Transactions on Automatic Control; AC-23; Feb. 197
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Minimal order observers for linear functions of the state vector (1978)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: The problem of estimating linear functions of a state vector in a multi-input/output system is considered. A simple lower bound on the observer order with arbitrary eigenvalues is established. Algorithms to construct minimal-order stable (or arbitrary dynamics) observers are also outlined.
    Keywords: CYBERNETICS
    Type: Electronics Letters; 14; Apr. 27
    Format: text
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  • 3
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    Eigenvalue/eigenvector assignment using output feedback (1978)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The problem of eigenvalue assignment in a linear time-invariant system using output feedback is considered. New sufficient conditions are derived to assign an almost arbitrary set of minimum (n,m + r - 1) distinct eigenvalues where n, m, and r are the number of states, inputs, and outputs, respectively. These conditions precisely identify the class of systems where such an assignment is impossible. The synthesis technique also highlights the freedom in selection of closed-loop eigenvectors under output feedback. The utility of eigenvalue/eigenvector assignment in transient response shaping is illustrated by the design of a controller for the lateral dynamics of an aircraft.
    Keywords: CYBERNETICS
    Type: NASA-TP-1118 , L-11869
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Modal control theory and application to aircraft lateral handling qualities design (1978)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A multivariable synthesis procedure based on eigenvalue/eigenvector assignment is reviewed and is employed to develop a systematic design procedure to meet the lateral handling qualities design objectives of a fighter aircraft over a wide range of flight conditions. The closed loop modal characterization developed provides significant insight into the design process and plays a pivotal role in the synthesis of robust feedback systems. The simplicity of the synthesis algorithm yields an efficient computer aided interactive design tool for flight control system synthesis.
    Keywords: AIRCRAFT STABILITY AND CONTROL
    Type: NASA-TP-1234 , L-12177
    Format: application/pdf
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  • 5
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    A new spectral synthesis procedure for multivariable regulators (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A method for selecting a multivariable state feedback controller that simultaneously achieves an a priori specification on closed loop eigenvalues and good mode mixing is presented. The problem is solved by projecting a desired modal matrix onto a constraint set containing the null space of the closed-loop state matrix, while assuring that the projection is in the null space. The feedback matrix follows immediately in the formulation. An example involving a helicopter hover controller is presented.
    Keywords: CYBERNETICS
    Type: Annual Allerton Conference on Communication, Control and Computing; Oct 04, 1978 - Oct 06, 1978; Monticello, IL
    Format: text
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  • 6
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    Design of robust state feedback controllers via eigenvalue/eigenvector assignment (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A new method of selecting a multivariable state feedback controller is presented. The resulting controller simultaneously realizes arbitrary closed-loop eigenvalues, approximates specified modal behavior and achieves low eigensystem sensitivity with respect to plant parameter variations. The method characterizes a vector space slightly larger than the null space of the closed-loop system matrix and projects a desired modal matrix onto this space. Sensitivity of eigenvalues and eigenvectors is then minimized local to the desired modal matrix using a gradient search technique. A tutorial example to illustrate the design procedure is given.
    Keywords: CYBERNETICS
    Type: Annual Asilomar Conference on Circuits, Systems, and Computers; Nov 06, 1978 - Nov 08, 1978; Pacific Grove, CA
    Format: text
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