Partial Fractions/Laplace Transforms

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In summary, the transfer function X(s) can be broken up into three partial fractions, with one of them being 1/s. To find the Laplace transform, the partial fractions can be solved using the formula \frac{1}{s(s-a)(s-b)} = \frac{1}{ab} \cdot \frac{1}{s} + \frac{1}{a(a-b)} \cdot \frac{1}{s-a} + \frac{1}{b(b-a)} \cdot \frac{1}{s-b}. The values of A, B, and C can be found as A=3, B=nasty, and C=also_nasty.
  • #1
mpm
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I have the transfer function X(s) = (18s+10)/(s(3s^2+18s+10))/

I need to break it up into partial fractions so i can take the Lapalce transform and get it into a response.

I can't figure out what it breaks up into though. I know its 3 partial fractions and one of which is 1/s I believe. But I am not sure about the other two.

Can someone help me with this so maybe I can find the laplace transform of it?

Thanks
 
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  • #2
break-up X(s) by partial fracs using

[tex]X(s)=\frac{A}{s} + \frac{B}{s+3-\frac{\sqrt{51}}{3}}+ \frac{C}{s+3+\frac{\sqrt{51}}{3}}[/tex]

solve to get A=3, B=nasty, C=also_nasty
 
  • #3
This may help:

[tex]\frac {1}{s(s-a)(s-b)} = \frac {1}{ab} \cdot \frac {1}{s} + \frac {1}{a(a-b)} \cdot \frac {1}{s-a} + \frac {1}{b(b-a)} \cdot \frac {1}{s-b}[/tex]
 

FAQ: Partial Fractions/Laplace Transforms

What is a partial fraction?

A partial fraction is a mathematical expression that can be used to decompose a complex rational function into simpler parts. It is a way of breaking down a larger problem into smaller, more manageable pieces.

Why are partial fractions useful?

Partial fractions are useful in many areas of mathematics, including calculus and differential equations. They allow us to simplify complex expressions and make them easier to work with. They also help us solve problems that would be difficult or impossible to solve otherwise.

What is a Laplace transform?

A Laplace transform is a mathematical tool used to convert a function from the time domain to the frequency domain. It is used in many areas of mathematics and engineering, particularly in the study of differential equations.

How are partial fractions and Laplace transforms related?

Partial fractions and Laplace transforms are closely related because they are both used to simplify and solve complex mathematical problems. Laplace transforms can often be used to find the partial fraction decomposition of a function, and vice versa.

What are some applications of partial fractions and Laplace transforms?

Partial fractions and Laplace transforms have many practical applications, including in signal processing, control systems, and circuit analysis. They are also used in fields such as physics, economics, and biology to model and solve real-world problems.

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