Characterization of the Stabilizing PID Controller Region for the Model-Free Time-Delay System

<table>The Nyquist plot for Example <a href="https://static.hindawi.com/articles/jam/volume-2013/926430/figures/#ex1">6</a>.</table>

Journal of Applied Mathematics

Figure 2: Characterization of the Stabilizing PID Controller Region for the Model-Free Time-Delay System 