Difference between nyquist plot and bode plot

The Bode plots graph the logarithm of the gain and the phase lag against the logarithm of the frequency. The Nyquist plot consists of the trajectory of G(iω) , as ω runs over a range of frequencies, where G(s) is the transfer function of the system.

1. What is the difference between polar plot and Nyquist plot?
2. What is the difference between a root locus plot and a Bode plot?
3. What does a Nyquist plot show?
4. What is Bode plot used for?

What is the difference between polar plot and Nyquist plot?

The primary difference between the polar plots and the Nyquist plot is that the polar plots are based on frequencies range from zero to infinity, while the Nyquist plot also deals with negative frequencies.

What is the difference between a root locus plot and a Bode plot?

Bode plots show the gain-phase relationship with frequency directly and are most useful for compensating fixed-gain amplifiers. Root-locus plots show the closed-loop poles in the s-plane and how these poles vary with loop gain.

What does a Nyquist plot show?

4.2.

A Nyquist plot shows on the complex plane the real part of an FRF against its imaginary part with frequency as an implicit variable. The benefit of using Nyquist plot comes from the circularity of an FRF on the complex plane.

What is Bode plot used for?

The Bode plot is a popular tool with control system engineers because it lets them achieve desired closed-loop system performance by graphically shaping the open-loop frequency response using clear and easy-to-understand rules.