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modelling simulink block diagram

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Holaar
Holaar 2014-2-5
回答： Azzi Abdelmalek 2014-2-5
I'm using simulink to model the following:
U(s) ------> 2s+6 ------> X(s)
So the input U(s) multiplied by (2s+6) gives the output X(s). Now my problem is which block in simulink allows me to write (2s+6)? Should it be a gain? But then gain blocks require a numerical value, and this 2s+6 obviously has s. How do I do this. THanks.

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Anuj
Anuj 2014-2-5
Go to simulink lobrary and type transfer fcn.
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Anuj
Anuj 2014-2-5
s in numerator means differntiation, you can use derivative block multiplied by 2 and then add 6 to get 2s+6.
Holaar
Holaar 2014-2-5
ok so du/dt = s. What about s^2? I just link up two derivative blocks? THanks a lot

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Azzi Abdelmalek
Azzi Abdelmalek 2014-2-5
Try this approximation:
(2s+6)/(0.0000001s+1)

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