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arXiv · 2404.05609

Feedback Stability Under Mixed Gain and Phase Uncertainty

Jiajin Liang·Di Zhao·Li Qiu
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Abstract

In this study, we investigate the robust feedback stability problem for multiple-input-multiple-output linear time-invariant systems involving sectored-disk uncertainty, namely, dynamic uncertainty subject to simultaneous gain and phase constraints. This problem is thereby called a sectored-disk problem. Employing a frequency-wise analysis approach, we derive a fundamental static matrix problem that serves as a key component in addressing the feedback stability. The study of this matrix problem heavily relies on the Davis-Wielandt (DW) shells of matrices, providing a profound insight into matrices subjected to simultaneous gain and phase constraints. This understanding is pivotal for establishing a less conservative sufficient condition for the matrix sectored-disk problem, from which we formulate several robust feedback stability conditions against sectored-disk uncertainty. Finally, several conditions based on linear matrix inequalities are developed for efficient computation and verification of feedback robust stability against sectored-disk uncertainty.

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Jiajin Liang, Di Zhao, Li Qiu. 2024-04-08. Feedback Stability Under Mixed Gain and Phase Uncertainty. https://arxiv.org/abs/2404.05609

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