Notice that at 180 deg phase shift the gain is still > 0dB!Cocoleia said:
I'm not sure what I am supposed to looking at to figure this out thenrude man said:
So then my answer would be none of the above so it can be negative ?rude man said:
Cocoleia said:
Phase margin is a measure of how much additional phase shift can be applied to a system before it becomes unstable. It is typically expressed in degrees and indicates how close the system is to the point of oscillation.
The higher the phase margin, the more stable the system is. A phase margin of 0 degrees indicates that the system is at the brink of instability, while a phase margin of 180 degrees indicates perfect stability.
Gain margin is a measure of the amount by which the gain of a system can be increased before it becomes unstable. It is typically expressed in decibels (dB) and is closely related to phase margin.
Phase margin and gain margin can be calculated from the system's open-loop transfer function by using stability criteria such as the Bode plot or Nyquist plot. These plots help to visualize the phase and gain margins and determine their values.
Phase and gain margin are important because they provide insight into the stability of a system and help determine if any modifications are needed to ensure stability. They are also useful for comparing different control system designs and selecting the most suitable one for a given application.
