Robustness of Sampled-data Control Systems with Uncertain Physical Plant Parameters
Ackermann, J. and Hu, H. Z. (1991) Robustness of Sampled-data Control Systems with Uncertain Physical Plant Parameters. Automatica, Vol. 27, pp. 705-710. ISSN 0005-1098.
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When a linear plant model is discretized for digital control, then uncertain physical plant parameters enter exponentially into the coefficients of the open and closed-loop characteristic polynomials. The resulting robustness problem can be treated in the same "scaled" parameter space as the corresponding continuous-time problem if the plant is physically modelled by ordinary differential equations. Stability regions for both continuous and sampled systems are studied in their common parameter space. It is shown that the real root boundary at s = 0 for the continuous system is identical to the real root boundary at z = 1 for the sampled system. A new real root boundary at z = -1 arises and the complex root boundary is modified by sampling. The computation of these last two parts of the boundary is reduced to a simpler problem by a rational approximation.
|Title:||Robustness of Sampled-data Control Systems with Uncertain Physical Plant Parameters|
|Journal or Publication Title:||Automatica|
|In ISI Web of Science:||Yes|
|Page Range:||pp. 705-710|
|Keywords:||Scaleability; sampling uncertain systems; parameter space stability boundaries.|
|HGF - Research field:||Aeronautics, Space and Transport|
|HGF - Program:||Aeronautics|
|HGF - Program Themes:||L AR - Aircraft Research|
|DLR - Research area:||Aeronautics|
|DLR - Program:||L AR - Aircraft Research|
|DLR - Research theme (Project):||L - Flexible Aircraft (old)|
|Institutes and Institutions:||Institute of Robotics and Mechatronics > Robotic Systems|
|Deposited By:||elib DLR-Beauftragter|
|Deposited On:||13 Nov 2007|
|Last Modified:||27 Apr 2009 06:47|
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