How to read Bode Plots?
Blode plots show the frequency response, that is, the changes in magnitude and phase as a function of frequency.
Parameters of Bode Plot
Figure 1 shows the gain and phase plot. The gain cross over frequency (wpc) and phase crossover frequency (wpc) can be calculated using gain plot and phase plot respectively.
Wgc is the value at 0dB whereas Wpc is the value at -180o.
Phase margin and gain can be calculated by extending the graph as shown in the figure.
Stability by bode plot:
ωpc > ωgc ->System is stable ωpc < ωgc ->System is unstable ωpc = ωgc ->System is marginally stable
Bode Plots in Control System
Bode plots describe the linear time-invariant systems’ frequency response (change in magnitude and phase as a function of frequency). It helps in analyzing the stability of control system. It applies to the minimum phase transfer function i.e. (poles and zeros should be in the left half of the s-plane).
In this article, we are going to learn what is Bode Plot and Types of Bode Plots and how to draw Blode plot and parameters of Bode plot, we are going to learn what is Phase and Gain Margin and what are the advantages and disadvantages of Bode plots in Control System.
Table of Content
- What are Bode Plots?
- Types of Bode Plot
- How to draw Bode Plot?
- How to read Bode Plots?
- Phase and Gain Margins
- Advantages
- Disadvantages
- Solved Examples
- FAQs
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