MATLAB Central Newsreader - transfer function in a time constant form

transfer function in a time constant form

pietro — Tue, 05 May 2009 12:44:03 -0400

Is there a command to convert a trasfer function in zero pole form to time constant form? Thanks in advance.

Re: transfer function in a time constant form

Nasser Abbasi — Tue, 05 May 2009 13:10:54 -0400

"pietro " <bracardi82@email.it> wrote in message
news:gtpcaj$bk3$1@fred.mathworks.com...
> Is there a command to convert a trasfer function in zero pole form to time
> constant form? Thanks in advance.

"time constant form" ?

You mean to get the equation of motion from the tf?

something like this?

for example

EDU>> clear all
z = -0.5;
p = [0.1+i 0.1-i];
k = 1;
H = zpk(z,p,k);
tf(H)

Transfer function:
s + 0.5
------------------
s^2 - 0.2 s + 1.01

EDU>> syms s
EDU>> ilaplace( (s + 0.5)/(s^2 - 0.2 *s + 1.01) )

ans =

exp(t/10)*(cos(t) + (3*sin(t))/5)

--Nasser

Re: transfer function in a time constant form

pietro — Tue, 05 May 2009 13:33:01 -0400

"Nasser Abbasi" <nma@12000.org> wrote in message <AVWLl.28621$yr3.5220@nlpi068.nbdc.sbc.com>...
>
> "pietro " <bracardi82@email.it> wrote in message
> news:gtpcaj$bk3$1@fred.mathworks.com...
> > Is there a command to convert a trasfer function in zero pole form to time
> > constant form? Thanks in advance.
>
> "time constant form" ?
>
> You mean to get the equation of motion from the tf?
>
> something like this?
>
> for example
>
> EDU>> clear all
> z = -0.5;
> p = [0.1+i 0.1-i];
> k = 1;
> H = zpk(z,p,k);
> tf(H)
>
> Transfer function:
> s + 0.5
> ------------------
> s^2 - 0.2 s + 1.01
>
> EDU>> syms s
> EDU>> ilaplace( (s + 0.5)/(s^2 - 0.2 *s + 1.01) )
>
> ans =
>
> exp(t/10)*(cos(t) + (3*sin(t))/5)
>
>
> --Nasser
>
In this links is shown the time constant form

https://www.informit.com/articles/article.aspx?p2090&seqNum=9

Re: transfer function in a time constant form

pietro — Tue, 12 May 2009 13:52:02 -0400

"pietro " <bracardi82@email.it> wrote in message <gtpcaj$bk3$1@fred.mathworks.com>...
> Is there a command to convert a trasfer function in zero pole form to time constant form? Thanks in advance.

can't anyone help me?

Re: transfer function in a time constant form

pietro — Tue, 12 May 2009 13:53:02 -0400