Robust stabilization of linear multivariable systems: relations to approximation |
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Authors: | KEITH GLOVER |
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Affiliation: | Information Engineering Division,Department of Engineering , University of Cambridge , Trumpington Street, Cambridge, CB2 1PZ, U.K. |
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Abstract: | A simple feedback controller methodology is presented that allows for exact tracking of the sinusoidal input signals and rejection of the sinusoidal disturbances in a closed loop control system. The control method is motivated by a mathematical inequality that expresses the tracking and disturbance rejection requirements for a closed loop system. The exact tracking of the input command at a particular frequency requires an infinite loop gain for the system at the frequency of the in put command. A second order undamped transfer function is cascaded to each input channel to increase the loop transfer function gain at the frequency of the input command. A feedback controller is then designed via the LQG/LTR method to stabilize the system while the loop gain remains large at the frequency of the input. The method is experimentally verified on a single axis servo system and extended to multivariable systems. |
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