Feedback Stability Under Mixed Gain and Phase Uncertainty
<|reference_start|>Feedback Stability Under Mixed Gain and Phase Uncertainty: 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.<|reference_end|>
@article{liang2024feedback,
    title={Feedback Stability Under Mixed Gain and Phase Uncertainty},
    author={Jiajin Liang, Di Zhao, Li Qiu},
    journal={arXiv preprint arXiv:2404.05609},
    year={2024},
    archivePrefix={arXiv},
    eprint={2404.05609},
    primaryClass={math.OC cs.SY eess.SY}
}