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Question about transfer function calculations

Asked by Saeed Ahmadzadeh Mahboobi on 10 Nov 2018 at 21:43
Latest activity Edited by Aquatris
on 14 Nov 2018 at 15:43
I have a Transfer function (in Laplace area), and know that the output signal of the system should be a definite value (to be more precise, it's a constant in time area, like 5). How can I calculate the input signal for this output value with MATLAB? in other words: I have the "Transfer function in laplace area" as well as "the output in time area", how can I calculate the input signal using MATLAB?

  3 Comments

You need to give more information. Does your transfer function has right half plane zeros, what is the order of the tranfer function, does it have same number of poles and zeros?
No, the Function has just one pole: F=a/(s+b) , whereby a and b are constants and the output should be a constant like c (in time area).
How can I get the input signal for this output ? Thank you
If the output is a constant 'c' for a transfer function F(s) = a/(s+b), it means that you are applying a constant input. The gain of F(s) at DC (or 0 Hz, or for constant input) is 'a/b'. So if you apply a constant input 'u = c*b/a', then the output will be 'y = F(0j)*u = a/(0+b)*(c*b/a)=c'.
Hope this helps.

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