1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Control Theory

  1. Apr 26, 2008 #1
    Hi there. I'm wondering if anyone can help. I've got a few past papers I'm working on at the moment and there are a few questions I don't even know where to start with. Here's one:

    a. Write down the transfer function for a time delay and then evaluate its corresponding frequency response as a magnitude and phase shift.

    b. A unity negative feedback control system that can be modelled as a pure time delay in series with an integrator is controlled using proportional control. After a small change in setpoint is made a sustained oscillation occurs which has a period of 120 seconds. Determine:

    i. The value of the controller gain
    ii. The magnitude of the processor dead time.

    Thanks again in advance
  2. jcsd
  3. Apr 26, 2008 #2


    User Avatar

    You must show some work before we can help you.
  4. Apr 27, 2008 #3
    CEL, that's the whole point of the sentence in my post that contains the phrase 'I don't even know where to start'!
  5. Apr 27, 2008 #4


    User Avatar

    I suggest that you look for information on some book. Modern Control Engineering, by Ogata, is a good option.
  6. Apr 27, 2008 #5
    Thanks CEL. Does that have exam type questions in it? That's really what I'm after for practice. My notes have examples in but nothing even remotely like the type of questions which have been set in the exam papers I've seen.
  7. Apr 27, 2008 #6


    User Avatar

    I have no idea what type are exam questions, but the book has lots of examples.
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?

Similar Discussions: Control Theory
  1. Control theory (Replies: 1)

  2. Control Theory (Replies: 2)