Frequency Methods: Bode Diagram and Nyquist Diagram

This lecture covers frequency methods in control systems, focusing on Bode diagrams and Nyquist diagrams. The instructor explains how to analyze a system's response to sinusoidal signals, how to plot Bode diagrams to understand system behavior, and how Nyquist diagrams provide insight into stability. Through examples, the lecture demonstrates how to calculate poles, zeros, and gain from these diagrams, emphasizing the importance of understanding system stability and relative order. The instructor also introduces the Cauchy argument principle to analyze stability in closed-loop systems. The lecture concludes with a discussion on stability criteria and the significance of conformal mapping in system analysis.