vibrating string displacement, partial differential problem

by leoflc
Tags: differential, displacement, partial, string, vibrating
leoflc is offline
Feb9-08, 08:46 PM
P: 56
1. The problem statement, all variables and given/known data
A damped vibrating string of length 1, that satisfies
u_tt = u_xx - ([tex]\beta[/tex])u_t

with the boundary conditions:

initial conditions:


solve for u(x,t) if [tex]\beta[/tex]^2 < 4Pi^2

3. The attempt at a solution

if u(x,t)=F(x)G(t)

So by using partial differential equations, I got:


I solved for F(x) with B.Cs and got:
F(x)=C*Sin(P*x), where C is a const.

when I tried to solve for G(t), I got a long equation with 2 constants in there.
If I try to solve for u(x,t) by using the F(x)G(t), I will have something with three unknow constants.

Am I on the right track?
I'm not sure how/when to apply I.Cs and [tex]\beta[/tex] to solve for u(x,t).

Thank you very much!
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