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Example
For the vibrating mass-spring system introduced in §2.1 and
Figure 2.1, we assume that
- all masses , so , and
- all damping constants , so .
This simplies the equations of motion to
.
We solve them by substituting
, where is
a constant vector and is a constant scalar to be determined.
This yields
Thus is an eigenvector
and is an eigenvalue of the symmetric positive
definite tridiagonal matrix . Thus is pure imaginary
and we get that is periodic with period
.
Symmetric tridiagonal matrices have particularly fast and efficient
eigenvalue algorithms.
Later sections deal with the cases of nonunit masses
and nonzero damping constants .
Susan Blackford
2000-11-20