Tuesday, January 18, 2011

nyquist stablity

The Nyquist stability criterion
The closed loop system is stable if and only if the net number of anticlockwise encirclements of the point -1+j0 by the Nyquist plot of the system loop gain transfer function G(s) is equal to
the number of poles of G(s) in the right half-plane:
Ncounterclock = P.

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