Laplace transform of convolution with derivative in it

Click For Summary
SUMMARY

The discussion focuses on the Laplace transform of the convolution integral involving a derivative, specifically the expression f(t) = ∫₀^τ sin(8τ)f'(t-τ)dτ. The user is confused about how to handle the f'(t-τ) term within the integral. The relevant equation for Laplace transforms of convolutions is established as F(s)G(s), where F(s) represents the Laplace transform of f(t) and G(s) is the transform of g(t). A potential solution is suggested as F(s) = 8/(s² + 8²)(sF(s) - f(0)).

PREREQUISITES
  • Understanding of Laplace transforms and their properties
  • Familiarity with convolution integrals
  • Knowledge of derivatives in the context of Laplace transforms
  • Basic proficiency in trigonometric functions, specifically sine
NEXT STEPS
  • Study the properties of Laplace transforms, focusing on convolution
  • Learn about the differentiation property of Laplace transforms
  • Explore examples of Laplace transforms involving trigonometric functions
  • Review the application of initial conditions in Laplace transform problems
USEFUL FOR

Students studying differential equations, engineers working with control systems, and anyone seeking to understand the application of Laplace transforms in solving integral equations.

tjosan
Messages
32
Reaction score
2

Homework Statement



Hi,

I am wondering how to Laplace transform this expression

[tex]f(t)=\int^{\tau}_{0} g(\tau)f'(t-\tau)d\tau[/tex]
or more precisely
[tex]f(t)=\int^{\tau}_{0} sin(8\tau)f'(t-\tau)d\tau[/tex]

The [tex]f'(t-\tau)[/tex] gets me confused.

Homework Equations



[tex]\int^{\tau}_{0} f(t-\tau)g(\tau)d\tau[/tex]
and the laplace transform of that is:
[tex]F(s)G(s)[/tex]

The Attempt at a Solution


I have no idea how to proceed.

Maybe
[tex]F(s)=8/(s^2+8^2)(sF(s)-f(0))[/tex]
 
Last edited:
Physics news on Phys.org

Similar threads

Replies
2
Views
2K
  • · Replies 1 ·
Replies
1
Views
1K
  • · Replies 2 ·
Replies
2
Views
3K
  • · Replies 10 ·
Replies
10
Views
3K
  • · Replies 2 ·
Replies
2
Views
2K
  • · Replies 14 ·
Replies
14
Views
3K
  • · Replies 1 ·
Replies
1
Views
1K
  • · Replies 8 ·
Replies
8
Views
3K
  • · Replies 23 ·
Replies
23
Views
3K
  • · Replies 11 ·
Replies
11
Views
2K