The Nyquist Criterion is a graphical method used in control theory to determine the stability of a feedback control system based on its open-loop frequency response. By analyzing the Nyquist plot, which represents how the gain and phase of a system change with frequency, engineers can assess whether the closed-loop system will remain stable under various conditions. This criterion connects transient response, steady-state error, stability, digital controller design, and linearization by providing a framework to evaluate system performance across these areas.
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