custom built transfer function block in simulink

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Nima@
Nima@ 2012-2-10
I want to create a block of transfer function "2s+1" in Simulink.When I try to add ,by editing 1/s+1,could edit numerator for 2s+1 but recieve error message on editing denominator value to 1.Please guide how to proceed.Also,please help me to know,if a transfer function created in matlab by code,can it be converted to the respective block in .mdl file,by any way?

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回答（2 个）

Guy Rouleau
Guy Rouleau 2012-2-10
After you open the block dialog, click on the "Help" button... it should explain everything.
You can find the same here:
http://www.mathworks.com/help/toolbox/simulink/slref/transferfcn.html
Kaustubha Govind
Kaustubha Govind 2012-2-13
The "s" is a derivative term, so why not just use the Derivative block, followed by a Gain=2, and add that output back to the input to get "2s+1".

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