compensative networks, help!

Feb 09, 2004 1 Replies
A

Hi everybody!


I´m desperated, crying for help with this exercise, I´ve tried many ways with no success.



Given the following system, compensate it in order to get a closed-loop damping coefficient of 0.7



The plant is


K.(s+1) G(s)= -------------------- 2 s.(s-1).(s +4s+16)


The feedback is:


H(s)= 1


The fact is that I´ve tried many ways using the root locus diagram and I couldn´t get any compensative network which leads to a two closed-loop dominant conjugated poles.



Please... help me ...



Alejandro


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P

See if this helps. I did this quickly so there aren't much in the way of comments.

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assumed you meant (s^2+4*s+16). Also, if I add an integrator then the system has 6 poles. I assumed you wanted the three complex poles to be at the same place. To do this I had to add some higher order gains to the PID. You would probably need an observer to use these gains as quantizing errors will cause much grief.

Peter Nachtwey

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