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The polar plot of a transfer function with ω as the parameter is known as the
- a)Nyquist plot
- b)Bode plot
- c)Root-locus
- d)Signal flow graph
Correct answer is option 'A'. Can you explain this answer?
Most Upvoted Answer
The polar plot of a transfer function withω as the parameter is ...
Nyquist plot:
Nyquist plots are an extension of polar plots for finding the stability of the closed-loop control systems. This is done by varying ω from −∞ to ∞, i.e. Nyquist plots are used to draw the complete frequency response of the open-loop transfer function.
Method of drawing Nyquist plot:
Nyquist plots are an extension of polar plots for finding the stability of the closed-loop control systems. This is done by varying ω from −∞ to ∞, i.e. Nyquist plots are used to draw the complete frequency response of the open-loop transfer function.
Method of drawing Nyquist plot:
- Locate the poles and zeros of open-loop transfer function G(s)H(s) in ‘s’ plane.
- Draw the polar plot by varying ω from zero to infinity.
- Draw the mirror image of the above polar plot for values of ω ranging from −∞ to zero.
- The number of infinite radii half circles will be equal to the number of poles at the origin.
- The infinite radius half-circle will start at the point where the mirror image of the polar plot ends. And this infinite radius half-circle will end at the point where the polar plot starts.
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The polar plot of a transfer function withω as the parameter is ...
Nyquist plot:
Nyquist plots are an extension of polar plots for finding the stability of the closed-loop control systems. This is done by varying ω from −∞ to ∞, i.e. Nyquist plots are used to draw the complete frequency response of the open-loop transfer function.
Method of drawing Nyquist plot:
Nyquist plots are an extension of polar plots for finding the stability of the closed-loop control systems. This is done by varying ω from −∞ to ∞, i.e. Nyquist plots are used to draw the complete frequency response of the open-loop transfer function.
Method of drawing Nyquist plot:
- Locate the poles and zeros of open-loop transfer function G(s)H(s) in ‘s’ plane.
- Draw the polar plot by varying ω from zero to infinity.
- Draw the mirror image of the above polar plot for values of ω ranging from −∞ to zero.
- The number of infinite radii half circles will be equal to the number of poles at the origin.
- The infinite radius half-circle will start at the point where the mirror image of the polar plot ends. And this infinite radius half-circle will end at the point where the polar plot starts.
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