Matlab transfer functions

coolkav55 — Fri, 27 Mar 2009 13:26:49 -0400

Hey,

How would i go about entering this transfer function into matlab?

K( 1 + 1/Tis + Td(s) )( 1/(0.44s +1)(0.17s+1) )

Its the closed loop TF with PID control.
I know how to enter the second bit, just not sure on the 1st half.
Thanks

Re: Matlab transfer functions

Pascal Gahinet — Sun, 29 Mar 2009 15:04:28 -0400

If you have the Control System Toolbox, do

s = tf('s');
sys = K * (1+1/(Ti*s) + Td*s) / (0.44*s +1) / (0.17*s+1);

- pascal

"coolkav55" <kavanaa1@tcd.ie> wrote in message
news:19909950.1238160439693.JavaMail.jakarta@nitrogen.mathforum.org...
> Hey,
>
> How would i go about entering this transfer function into matlab?
>
> K( 1 + 1/Tis + Td(s) )( 1/(0.44s +1)(0.17s+1) )
>
> Its the closed loop TF with PID control.
> I know how to enter the second bit, just not sure on the 1st half.
> Thanks

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Matlab transfer functions

Re: Matlab transfer functions