Web-Based Control System Analysis and Design
Margin
DESCRIPTION:
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: