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Using centered finite difference approximations (FDA) for the
second-order partial derivatives, we obtain a finite difference
scheme for the ideal wave equation
[30,18]:
where is the time sampling interval, and is a spatial
sampling interval.
Substituting the FDA into the wave equation, choosing ,
where
is sound speed (normalized to
below), and sampling at times and positions , we obtain
the following explicit finite difference scheme for the string
displacement:
|
(4) |
where the sampling intervals and have been normalized to
1. To initialize the recursion at time , past values are needed
for all (all points along the string) at time instants and
. Then the string position may be computed for all by
Eq. (4) for
. This has been called the
FDTD or leapfrog finite difference scheme [9].
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Download wgfdtd.pdf