Inverse laplace transform without partial fractions

In summary, to find the inverse Laplace transform of 6/[s^4(s-2)^2], you can use partial fractions or the Bromwich integral. It is also possible to manipulate the expression to use the Laplace table, but it may not necessarily make the process easier.
  • #1
shreddinglicks
212
6

Homework Statement


take inverse laplace of:

6/[s^4(s-2)^2]

Homework Equations


6/[s^4(s-2)^2]

The Attempt at a Solution


I used partial fractions. I was wondering if It could be manipulated to where I could use the laplace table?
 
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  • #2
If you don't want to use partial fractions, you could evaluate the Bromwich integral:
$$\frac{1}{2\pi i}\int_{\sigma-i\infty}^{\sigma+i\infty} \frac {6 e^{st}}{s^4(s-2)^2}\,ds$$
 
  • #3
shreddinglicks said:

Homework Statement


take inverse laplace of:

6/[s^4(s-2)^2]

Homework Equations


6/[s^4(s-2)^2]

The Attempt at a Solution


I used partial fractions. I was wondering if It could be manipulated to where I could use the laplace table?
You could write it as$$
\frac 6 {s^4}\cdot \frac 1 {(s-2)^2}$$inverse both factors using table methods, and take the convolution for your answer. Not sure it would be any easier though.
 

1. What is the inverse Laplace transform?

The inverse Laplace transform is a mathematical operation that takes a function in the frequency domain and converts it back to the time domain. It is the reverse operation of the Laplace transform, which converts a function from the time domain to the frequency domain.

2. What is partial fraction decomposition?

Partial fraction decomposition is a method used to break down a rational function into simpler fractions. This is useful for solving integrals and performing other mathematical operations.

3. Do I always need to use partial fraction decomposition when finding the inverse Laplace transform?

No, partial fraction decomposition is not always necessary for finding the inverse Laplace transform. It is a useful tool for solving certain types of functions, but there are other methods that can be used as well.

4. Can I use a calculator to find the inverse Laplace transform without using partial fractions?

Yes, there are calculators and software programs that can compute the inverse Laplace transform without requiring the use of partial fraction decomposition. However, it is still important to understand the concept of partial fractions and how it relates to the inverse Laplace transform.

5. What are some common applications of the inverse Laplace transform?

The inverse Laplace transform is used in many areas of science and engineering, including control systems, signal processing, and circuit analysis. It is also used in solving differential equations, which are fundamental to many fields of science and engineering.

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