Robust Controller Design by Linear Programming with Application to a Double-Axis Positioning System

A linear programming approach is proposed to tune fixed-order linearly parameterized controllers for stable LTI plants. The method is based on the shaping of the open-loop transfer function in the Nyquist diagram. A lower bound on the crossover frequency and a new linear stability margin which guarantees lower bounds for the classical robustness margins are defined. Two optimization problems are proposed and solved by linear programming. In the first one the robustness margin is maximized for a given lower bound on the crossover frequency, whereas in the second one the integrated error is minimized with constraints on the new stability margin. The method can directly consider multi-model as well as frequency-domain uncertainties. An application to a high-precision double-axis positioning system illustrates the effectiveness of the proposed approach.

Published in:
Control Engineering Practice, 15, 2, 197-208
Prj_ControllerDesignLinProg Prj_RobustRST_PosSyst
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Note: The status of this file is: Involved Laboratories Only

 Record created 2005-12-02, last modified 2018-07-08

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