Applying Partial Fractions to Solve Laplace Transform Convolution

In summary, to find the convolution of x(t) and h(t), we first take the Laplace transform of both functions, which gives us X(s) = s/(s^2+9π^2) and H(s) = 1/(s+2). We then use the formula Y(s) = X(s)H(s) to find the Laplace transform of the convolution, and finally take the inverse Laplace transform to find y(t). The complication may arise when finding the partial fractions of X(s) and H(s), but it is a necessary step in solving the problem.
  • #1
redundant6939
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Homework Statement


[itex]x(t) = cos(3πt)[/itex]
[itex]h(t) = e-2tu(t)[/itex]

Find [itex]y(t) = x(t) * h(t) [/itex](ie convolution)

Homework Equations


Y(s) = X(s)H(s) and then take inverse laplace tranform of Y(s)

The Attempt at a Solution


[itex] L(x(t)) = \frac{s}{s^2+9π^2} [/itex]
[itex] L(h(t)) = \frac{1}{s+2} [/itex]

I then try to find the partial fractions but it looks more complicated than it should be..
 
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  • #2
What about u(t) ?
 
  • #3
redundant6939 said:

Homework Statement


[itex]x(t) = cos(3πt)[/itex]
[itex]h(t) = e-2tu(t)[/itex]

Find [itex]y(t) = x(t) * h(t) [/itex](ie convolution)

Homework Equations


Y(s) = X(s)H(s) and then take inverse laplace tranform of Y(s)

The Attempt at a Solution


[itex] L(x(t)) = \frac{s}{s^2+9π^2} [/itex]
[itex] L(h(t)) = \frac{1}{s+2} [/itex]

I then try to find the partial fractions but it looks more complicated than it should be..

Show us your partial fractions work. It shouldn't be all that hard.
 

1. What is Laplace transform convolution?

Laplace transform convolution is a mathematical operation used in signal processing and control theory. It involves multiplying the Laplace transforms of two functions and then taking the inverse Laplace transform of the product. This operation allows us to solve differential equations and analyze linear systems in the Laplace domain.

2. How is Laplace transform convolution different from regular convolution?

In regular convolution, the input and impulse response signals are multiplied together and then integrated over time. In Laplace transform convolution, the Laplace transforms of the two signals are multiplied and then the inverse Laplace transform is taken. This allows for a more efficient and elegant way of solving differential equations and analyzing linear systems.

3. What are the applications of Laplace transform convolution?

Laplace transform convolution is commonly used in engineering and physics for solving differential equations and analyzing linear systems. It is also used in signal processing for filtering, deconvolution, and spectral analysis.

4. Can Laplace transform convolution be used for non-linear systems?

No, Laplace transform convolution can only be used for linear systems. Non-linear systems require more complex mathematical tools for analysis.

5. Are there any limitations to using Laplace transform convolution?

One limitation of Laplace transform convolution is that it can only be used for linear time-invariant systems. Additionally, it can be challenging to find the inverse Laplace transform of the product of two Laplace transforms, especially for complex functions.

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