- you can rotate your frequency response plot on the Nyquist diagram and never changed your encirclement condition
- this means your system can robustly handle phase uncertainty and time delays
What does infinite phase margin mean of a transfer function and is this even practical in the real world?
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Roger van Rensburg
le 19 Juin 2015
Réponse apportée : Roger van Rensburg
le 26 Juil 2015
Goodday all,
I've stabilized a very unstable inverted pendulum system using state-feedback. When I analyze stability using frequency response by observing the bode plot in Matlab, I found the magnitude in the gain margin plot below the 0db line for all frequencies (see bode attached). This causes my phase margin to be infinite but does cross the -180 degree line in the phase margin plot that gives me a finite gain margin. I don't understand the significance of the infinite phase margin, is it good or bad for a system or even practical? I know from tutorials that the higher the gain and phase margin the better the stability.
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Craig
le 22 Juil 2015
A few ways to interpret an infinite phase margin is:
-craig
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