modelling simulink block diagram

2014 2 5
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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

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Go to simulink lobrary and type transfer fcn.

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Holaar
Holaar 2014-2-5
编辑：Holaar 2014-2-5
but transfer fcn must be a fraction form. There must be something in the denominator. And if I set the denominator to 1, and try to set the numerator to 2s+6, it says "order of the denominator must be greater than the numerator".
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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