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Lead-lag system and model with Simulink

  1. Sep 27, 2015 #1

    Maylis

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    1. The problem statement, all variables and given/known data
    upload_2015-9-27_14-43-47.png
    upload_2015-9-27_14-44-3.png

    2. Relevant equations


    3. The attempt at a solution
    Hello,

    I am trying to construct the model, but I don't know how to incorporate 3 steps. I tried making 3 step blocks, but the input for the transfer function will only take one line. Then I tried to use one step block and make a vector indicating a new step at 3 different times
    upload_2015-9-27_14-47-13.png
    upload_2015-9-27_14-46-29.png
    But this is not working, it doesn't like the vector input. Any idea how I can utilize 3 steps?
     
  2. jcsd
  3. Sep 28, 2015 #2

    donpacino

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    you can use a summing block and three separate step blocks.
    There is also an input that will allow you to create your own waveform
     
  4. Sep 28, 2015 #3

    Maylis

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    Thanks, I didn't know how the sum block worked before, now I do.
     
  5. Sep 29, 2015 #4

    LvW

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    I am a bit surprised about the transfer function G(s)=(s+1)/(s+1)=1.
    Who told you that this is a lead-lag block? It is a unity gain element, nothing else.
     
  6. Sep 29, 2015 #5

    Maylis

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    The homework assignment said, look at the problem statement.
     
  7. Sep 29, 2015 #6

    LvW

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    Didn`t you realize that G(s)=1 ?
    Should be a typing error; why not googling for lead-lag?
     
  8. Sep 29, 2015 #7

    Maylis

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    Yes, admittedly I don't know what lead-lag means. I was just trying to solve the problem for the homework
     
  9. Sep 29, 2015 #8

    LvW

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    Watch point e) of the problem statement (time constants).
    Time constants appear in th transfer function as factors, for eample: (s*T+1).
     
  10. Sep 29, 2015 #9

    donpacino

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