Today was spent at the creative assessment console a bit more doing some
revision
and assessment for the "shut that noise up" project.
With a few hours in action with the DCI treated airbox there's been a bit of
time
to ponder the new cabin experience using the Clarity Aloft headset.
Things have been very comfortable, however a resonant band has been showing up
---From 4100rpm to about 4800rpm where the carbi noise is howling. This is just
not
acceptable and has not passed the Area-51 EQA (experience quality assessment).
Coming back to the console the Modal Frequency analysis file was reopened and
forensic
data more closely looked for evidence of Mass Vibration... The forensic's
team were not required to fabricate false evidence or narrative on this
occasion.
Running the Modal solution again it was found that very little resonance was
being
generated by the airbox; some resonance was displaying at various bands within
our interrogation but we are convinced the information gained points toward
another source presenting the howling; most probably the carburettor throats
themselves.
While the file was open it was a good opportunity to assess the Modal qualities
of the pending baffle addition Mod. These results were even better than the non
baffled airbox; data gathered shows very little Modal vibration from idle
through
to max rpm; and this is a great unanticipated result straight off the bat...
Coupled with the earlier gathered Harmonic Acoustic results we can assume
that there will be very little carburettor noise in action; so its expected
the howling will be successfully vanquished from the sacred realm.
Winter is almost here, and the baffle Mod must be installed.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=510870#510870
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