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Control Systems question

Control Systems question

Control Systems question

(OP)


Hi Guys, can anyone help me with this control systems tutorial problem been asking around and I can't seem to find any solutions. Would be much appreciated. Thank You.

RE: Control Systems question

Students are not supposed to be asking questions on this forum. However, I have a few comments. I would call BS on the professor that asked these questions. Where would one get such detailed transfer functions? It is possible to estimate the transfer function for problem 2 but in over 40 years I have NEVER SEEN a transfer function as complicated as problem #1 and #3 in real life.

#1 is a mess. This isn't two hard if you treat it like a inner and outer loop. This isn't too hard with Mathcad or wxMaxima.
#2 it isn't that hard to calculate the open loop transfer function if the closed loop transfer function is known when you know the feedback function.
#3 The zero is on the right hand side. You can use root locus since there is only one gain or K to worry about. However, in real life there are many gains. Also, being stable is nice but in reality people want precision and one gain will not hack it. There are 3 poles. Two will be complex. It is when these poles reach the imaginary axis the system is marginally stable.

So, the questions are poor/unrealistic and you haven't done your home work.

Peter Nachtwey
Delta Computer Systems
http://www.deltamotion.com
http://forum.deltamotion.com/
IFPE Hall of Fame Member

RE: Control Systems question

(Moved to student forum)

Richard, you need to show us your work first, then we will guide you appropriately based upon what you've shown us... but we do not provide flat out answers.

Dan - Owner
http://www.Hi-TecDesigns.com

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