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Homework Help: Closed-loop transfer function

  1. Jan 2, 2014 #1
    1. The problem statement, all variables and given/known data

    Augment the model to include a proportional position controller and derive the closed-loop transfer function.

    The model is an hydraulic actuator system pushing against a mass.

    3. The attempt at a solution

    I think I have completed the first part correctly with putting in the proportional position controller however I am unsure how to go about deriving the transfer function. Do I need to simplify the model first? Any help would be appreciated

    Many Thanks

    Attached Files:

  2. jcsd
  3. Jan 2, 2014 #2


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    Staff: Mentor

    You'd add the feedback signal using one of those small circle thingos with a + and - on it.

    I reckon you have probably worked through a question similar to this in a tutorial or as a text book example, so look through those sources for ideas if no one replies here.
  4. Jan 3, 2014 #3

    rude man

    User Avatar
    Homework Helper
    Gold Member

    First, you need to come up with the transfer function without the feedback. Have you done this or are you able to?

    Did they tell you what transfer function to look for? x/v or x/F or ???
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