Web-Based Control System Analysis and Design
The function calculates and plots the minimum gain margin, phase margin,
and corresponding crossover frequencies of an SISO system. The gain margin is the factor
by which the gain K can be raised before the system becomes unstable. It can be calculated
from 1/G(jw), where |G(jw>)| is the magnitude at frequency w which makes the
phase angle of G(jw) equal to -180 degrees.
Similarly, the phase margin is another measure which is used to indicate the stability
margin of a system. It can be calculated from the phase of G(jw)-180 degrees at
frequency w which makes the magnitude |G(jw)| equal to 1.0. The frequency w is
then called crossover frequency.
Please select a model to represent the system: