Convolution Integral and Differential Equation

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Discussion Overview

The discussion revolves around the application of the convolution integral and the convolution theorem in the context of solving a differential equation. Participants explore how to approach the problem, particularly focusing on the relationship between the functions involved and the use of Laplace transforms.

Discussion Character

  • Exploratory, Technical explanation, Mathematical reasoning

Main Points Raised

  • One participant expresses confusion about where to start with the problem involving convolutions.
  • Another participant asks for clarification on the convolution theorem and the specific functions involved in the problem.
  • A participant provides the definition of convolution for piecewise continuous functions and relates it to the problem, identifying specific functions as f(t-τ) and g(τ).
  • There is a suggestion that the integral in the problem represents the convolution of y(t) and e^{-10t}, prompting a discussion on applying the convolution theorem.
  • One participant shares their progress in formulating an equation involving Y(s) and the inverse Laplace transform, seeking guidance on how to isolate Y(s).
  • Another participant advises taking the Laplace transform of all terms in the differential equation to obtain an algebraic equation in Y(s) for further manipulation.

Areas of Agreement / Disagreement

Participants appear to be exploring the problem collaboratively, but there is no consensus on the specific steps to take or the best approach to solve for Y(s). Multiple viewpoints and methods are presented without resolution.

Contextual Notes

Participants have not fully resolved the mathematical steps necessary to isolate Y(s) or the implications of the convolution theorem in this context. There are also dependencies on the definitions of the functions involved.

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I am really confused where to start with this problem. I know about convolutions somewhat. We have done them a little. Where is a good place to begin with this problem?
 
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What does the convolution theorem state about two functions? What are those two functions in this problem?

BiP
 
if f and g are piecewise continuous then the convolution of the two is
\int f(\tau)g(t-\tau)d\tau from 0 to t
or
\int f(t-\tau)g(\tau)d\tau from 0 to t

and

F(s)G(s)=Laplace Transform of the convolution of f and g


in this case y(t-w) is f(t-\tau) and e^{-10w} is g(\tau)

So now how can I use this too get y(t)?
 
Do you see that the integral in the problem you gave is the convolution of y(t) and e^{-10t ?

How can you apply the convolution theorem? You will obtain an algebraic equation in s. Solve it for Y(s).

BiP
 
So what I've figured so far is s*Y(s)-25* inverse laplace of {Y(s)G(s)} = 1

How can I solve for Y(s) when it is in the inverse laplace transform?
 
Taking the Laplace transform of every term in the differential equation should give you an algebraic equation in Y(s). Solve for this in terms of s, then take the inverse transform.

BiP
 

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