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Thread Subject:
transfer function in a time constant form

Subject: transfer function in a time constant form

From: pietro

Date: 5 May, 2009 12:44:03

Message: 1 of 5

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

Subject: transfer function in a time constant form

From: Nasser Abbasi

Date: 5 May, 2009 13:10:54

Message: 2 of 5


"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

Subject: transfer function in a time constant form

From: pietro

Date: 5 May, 2009 13:33:01

Message: 3 of 5

"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

Subject: transfer function in a time constant form

From: pietro

Date: 12 May, 2009 13:52:02

Message: 4 of 5

"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?

Subject: transfer function in a time constant form

From: pietro

Date: 12 May, 2009 13:53:02

Message: 5 of 5

"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?

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