# How to input exponentials in transfer functions using Simulink?

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Milca Munguia 2023년 3월 22일
댓글: Walter Roberson 2023년 3월 30일
This is my transfer function but I don't know how to input this on Simulink.

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### 답변(3개)

Sam Chak 2023년 3월 22일
You can insert the Transport Delay block (found in the Library of Continuous function blocks) after the transfer function.
See example here:
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Walter Roberson 2023년 3월 22일
If this must be implemented as transfer functions then you will need to copy the transfer function block several times, set the Input Delay differently on each copy, and then add the results all together.
Each individual transfer function can only represent a single exp(), not a sum of exp()
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Walter Roberson 2023년 3월 30일
You are right, @Paul -- that is a difference between the Simulink blocks and the MATLAB functions.

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Paul 2023년 3월 22일
In addition to using a single transfer function along with gains and transport delays as suggested by @Sam Chak, if you have the Control SystemToolbox, you can use one LTI System block and enter the transfer function as the LTI system variable parameter. For example, if
H(s) = 1/(s +1)*(exp(-1*s) - exp(-0.5*s))
then the expression for the block parameter would be:
tf(1,[1 1])*( exp(-1*tf('s')) - exp(-0.5*tf('s')) )

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