Additional Frequencies Near the Fundamental Mode
Jeff La Favre
jlafavre@gmail.com
The lateral and
torsional modes for bars D4 through C7 were examined in part four of the
pages covering these modes. The lateral and torsional modes for these
bars do not vibrate at frequencies close to the fundamental mode. Therefore,
we should not expect to see any beating patterns in the wave traces of
bars D4 through C7 due to beating against the fundamental. However, there
are a number of bars in this range for the La Favre marimba that clearly
have beating patterns when the bars are analyzed with the resonators in
place. The B4 bar has a very strong beating pattern for example. But when
the B4 bar is analyzed without the resonator in place, there is no beating
pattern in the wave trace envelope. I am currently investigating resonator
tuning, which appears to be the cause of the beating patterns found and
will report my findings on this page when completed.
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