Math Is Fun Forum

Nilbert

Guest

Partial fractions help

Ok, I'm having difficulty with a problem for a College project. I have a transfer function of a system which is:

12.5/(s+3/4)^2 + 99/16

What I need to do is perform partial fractions on this, multiplied by a step input, which is just 1/s. So basically i'm doing parts on:

1/s * 12.5 / (s+3/4)^2 + 99/16

Only I can't figure out how the heck that is supposed to work. I'm obviously going to get A/something for the s term, but for the other.... meh. I've never seen a partial fractions problem with a number term on its own on the bottom.

Once i've done this, I then have to perform a Laplace transform on the result, but I should be ok once I get to that stage, its just the partial practions i'm stuck on.

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: Partial fractions help

Hi Nilbert;

Try this:

---

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.