Nyquist Plot & stability
Nyquist Plot & stability
(OP)
Can any one explain how Nyquist plot is assosciated with predicting Stability of a system
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RE: Nyquist Plot & stability
H(s)/[1+G(s)H(s)].
As can be seen from the equation, the system will blow up when the product G(s)H(s) approaches -1. If you plot trajectory on the nyquist plot you can see how close it comes to the -1 point. Gain margin is how far below |1| the gain was when angle passed through 180. Phase margin is how much ahead of 180 was the phase when gain decreased through the magnitude |1| circle. Same info can be gained from Bode plot. There's lot's more that can be said....
RE: Nyquist Plot & stability
Further, will u be able to qoute some websites/ URL's for reference
regards,
kashyap
RE: Nyquist Plot & stability
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