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  • 1
    Electronic Resource
    Electronic Resource
    A computer science approach for solving elliptic differential equations (1995)
    New York, NY [u.a.] : Wiley-Blackwell
    Numerical Methods for Partial Differential Equations 11 (1995), S. 573-590 
    Details
    ISSN: 0749-159X
    Keywords: Mathematics and Statistics ; Numerical Methods
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics
    Notes: A method that combines computer science and numerical analysis techniques for the solution of elliptic partial differential equations in domains consisting of the union of rectangles is presented. It is applied to Laplace's equation and to the Navier-Stokes equations in several domains. The method is very flexible and can be easily modified to solve other equations. © 1995 John Wiley & Sons, Inc.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/num.1690110604
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Two-dimensional modeling of microscale transport and biotransformation in porous media (1994)
    New York, NY [u.a.] : Wiley-Blackwell
    Numerical Methods for Partial Differential Equations 10 (1994), S. 65-83 
    Details
    ISSN: 0749-159X
    Keywords: Mathematics and Statistics ; Numerical Methods
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics
    Notes: We develop a model for simulating the growth of a biofilm in a tortuous tube. The solutions to the Navier-Stokes equations and the advection-diffusion equation are calculated numerically using finite differences. These solutions are then coupled with a biofilm growth model. © 1994 John Wiley & Sons, Inc.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/num.1690100105
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  • 3
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    Discrete-time infinity control problem with measurement feedback (1992)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The paper is concerned with the discrete-time H(sub infinity) control problem with measurement feedback. The authors extend previous results by having weaker assumptions on the system parameters. The authors also show explicitly the structure of H(sub infinity) controllers. Finally, they show that it is in certain cases possible, without loss of performance, to reduce the dynamical order of the controllers.
    Keywords: CYBERNETICS
    Type: PB93-197523 , MEMO-COSOR-92-42 , NASA-CR-194681 , NAS 1.26:194681
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Noniterative computation of infimum in H(infinity) optimisation for plants with invariant zeros on the j(omega)-axis (1993)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A simple and noniterative procedure for the computation of the exact value of the infimum in the singular H(infinity)-optimization problem is presented, as a continuation of our earlier work. Our problem formulation is general and we do not place any restrictions in the finite and infinite zero structures of the system, and the direct feedthrough terms between the control input and the controlled output variables and between the disturbance input and the measurement output variables. Our method is applicable to a class of singular H(infinity)-optimization problems for which the transfer functions from the control input to the controlled output and from the disturbance input to the measurement output satisfy certain geometric conditions. In particular, the paper extends the result of earlier work by allowing these two transfer functions to have invariant zeros on the j(omega) axis.
    Keywords: CYBERNETICS
    Type: IEE Proceedings, Part D - Control Theory and Applications (ISSN 0143-7054); 148; 5; p. 298-304.
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Design of localizer capture and track hold for a transport airplane - An H(infinity)/LTR approach (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The authors describe the design of a lateral track-hold control law in a localizer capture and track autopilot using a procedure based on H(infinity)-optimization and loop transfer recovery. The recovery of the achievable performance using output feedback from a satisfactory track-hold design obtained in an H(infinity)-optimization is demonstrated. Simulation for a lateral track command is presented along with robustness properties of the output feedback design. Results indicate that the recovery of achievable performance must be carefully traded-off against control bandwidth limitation.
    Keywords: CYBERNETICS
    Type: IEEE Conference on Decision and Control; Dec 05, 1990 - Dec 07, 1990; Honolulu, HI; United States
    Format: text
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    NASA TECHNICAL REPORTS
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