Publications:Comments on "A Revisit to the Gain and Phase Margins ofLinear Quadratic Regulators"
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|Title||Comments on “A Revisit to the Gain and Phase Margins ofLinear Quadratic Regulators”|
|Journal||IEEE Transactions on Automatic Control|
|Abstract||In the above paper, an example is given, showing that the LQ controller gives an arbitrary small gain margin with respect to variations of the open-loop plant. As a remedy, a dynamic-state feedback is proposed which is claimed to give an arbitrary large gain margin. This is incorrect. In fact, the proposed dynamic state feedback controller does not even stabilize the nominal system.|