How to Draw Nyquist Plot?
Procedure to draw Nyquist Plot:
1. Draw Polar Plot
2. Draw Inverse polar Plot
3. Draw and map using Nyquist Contour
Rules of Nyquist Plot
- Determine the transfer function of the system.
- Calculate the complex transfer function value by putting s= jω, where ‘ω’ is angular frequency and ‘j’ is the imaginary unit.
- Determine the magnitude and phase of the complex transfer function.
- Plot the points in the polar coordinate for each frequency point.
- Connect all the points to create a smooth Nyquist curve. The curve represents the change in magnitude and phase with frequency.
- Calculate the number of encirclements around the point (-1,0). Each encirclement represents the value of ‘N’. The stability can be calculated using Nyquist Stability Criteria as discussed above.
Nyquist Plot
A Nyquist plot is a graphical representation used in control engineering. It is used to analyze the stability and frequency response of a system. The plot represents the complex transfer function of a system in a complex plane. The x-axis represents the real part of the complex numbers and the y-axis represents the imaginary part. Each point on the Nyquist plot reflects the complex value of the transfer function at that frequency.
Table of Content
- Nyquist Stability Criteria
- Important Terminologies of Nyquist Plot
- How to draw Nyquist Plot?
- Stability analysis using Nyquist Plot
- Solved Example of Nyquist Plot
- Advantages of Nyquist Plot
- Disadvantages of Nyquist Plot
- Application of Nyquist Plot
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