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The book provides a comprehensive introduction to both traditional and modern control theories, often including to help students simulate and visualize complex systems.

The Nyquist plot maps the open-loop transfer function G(s)H(s) around the critical point (-1,0). The net number of encirclements equals N = P - Z, where P = open-loop unstable poles, Z = closed-loop unstable poles (must be zero for stability). Automatic Control System Hasan Saeed Pdf Free 178

Gain margin and phase margin (from Bode/Nyquist plots) indicate how close the system is to instability. The book provides a comprehensive introduction to both