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MEC524 — Chapter 5
Bode Plots & Nyquist
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Bode Plots — Component Blueprint

Displays Magnitude (dB) and Phase (degrees) on logarithmic frequency scales, revealing individual pole and zero contributions.

◆ Diagram
Bode Plot — Frequency BlueprintMagnitude (dB)0 dBωgc0 dB/dec−20 dB/dec−40ωcPhase (°)−180°−90°0°ωpcω (log)±20 dB/decade RuleEach Pole−20 dB/decadeEach Zero+20 dB/decadeDouble Pole−40 dB/decadeIntegrator 1/s−20 dB/dec from ω=0Best for: Controller design & individual pole/zero analysisDual-graph frequency mapping on logarithmic scales
◆ Key Points
01.Two separate graphs: Magnitude plot + Phase plot
02.Each pole drops slope by −20 dB/decade at break frequency
03.Each zero adds +20 dB/decade at break frequency
04.Log scale makes multiplication → addition (simpler analysis)
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Ch 4: Root Locus