I've got a question that has left me stumbled on the Nyquist Stability criterion.

Consider a unity negative feedback system with plant L(s) and gain K in the forward loop.

A nyquist plot is to be generated for this system to meet the following criteria:

1) L(s) has one unstable right half plane pole

2) The closed loop system is stable for
(1/3 < K < 2) and unstable for K=1/3 and K=2.

3) Phase margin of 30 degrees

4) Zero steady state error to a step reference
input.

Help !

 

So how come it took you 35 years to ask that question <grin> I waited but forgot everything I ever knew!!!

Just keeping it light!!

Cheers from :
Jeremy Pollard, CET The Caring Canuckian!
www[.]tsuonline[.]com
Control Design www[.]controldesignmag[.]com
Manufacturing Automation www[.]automationmag[.]com
3 Red Pine Court, RR# 2 Shanty Bay, Ontario L0L 2L0

 

If it makes it any funnier, I'm still in school. Any comments on the question.

 

Sorry Morty .. Bode plots - OK but nyquist??? Those synapses are gone!!!
<grin>

I have a great book on it tho... Intro yo Automatic Controls - Harrison and Bollinger .. profs at the U of Wisconsin. I could scan and email the polar plot chapters if you think it might help

Different perspectives can make a difference

Cheers from :
Jeremy Pollard, CET The Caring Canuckian!
www[.]tsuonline[.]com
Control Design www[.]controldesignmag[.]com
Manufacturing Automation www[.]automationmag[.]com
3 Red Pine Court, RR# 2 Shanty Bay, Ontario L0L 2L0