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Non-linear control system stability investigation using the circle criterion

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1 Author(s)
Ho, C.F. ; University of Hong Kong, Electrical Engineering Department, Hong Kong, Hong Kong

The circle criterion provides a convenient method of testing stability in nonlinear feedback systems. The need for computer computation of the relative stability conditions for the Nyquist plot can be avoided by using a logarithmic gain-phase plot on the Nichols chart. The results of this technique agree within about 1% with those obtained from a computer solution of the Nyquist plot.

Published in:

Radio and Electronic Engineer  (Volume:41 ,  Issue: 6 )