Stability Margins and Optimality
For stabilization of an unstable system, feedback is a necessity. With uncertainties in the operating environment, and in system components, feedback is needed to preserve stability and improve performance. However, feedback can also be dangerous. A tighter feedback loop, instead of achieving better performance, may cause instability. To guard against such dangers, the quantitative concepts of gain and phase stability margins were among the frequency domain tools of the classical Nyquist-Bode designs.
KeywordsStability Margin Phase Margin Gain Margin Optimal Stabilization Input Uncertainty
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