Vibration Testing

Ernest, what the heck does "... fairly steady state and random,"
mean??

....
and just before flutter sets in the vibration begins
to diverge logritmically (I know that ain't spelt rite).

A circuit with a sort of squelch mode would be very useful, especially
during initial flight testing.

Or maybe better than a squelch threshold might be a LED bar-graph
showing relative magnitude..??

Sid Knox

Velocity N199RS
Starduster N666SK
KR2 N24TC
W7QJQ

You are dreaming ...

Yes you can predict flutter speeds by measuring the variation of modal
damping with speed. This can be done using accelerometers mounted on the
structure and connected to appropriate signal processing hardware.

However this must be done in a carefully controlled flight test environment
on an aircraft fitted with with equipment to excite various vibration modes
(rotating mass and other types of exciters are used).

Not something you can just lash onto any airplane and so flying and have a
light that flashes on when flutter is immenent !!




"sidk" wrote in message
om...
Ernest, what the heck does "... fairly steady state and random,"
mean??

....
and just before flutter sets in the vibration begins
to diverge logritmically (I know that ain't spelt rite).

A circuit with a sort of squelch mode would be very useful, especially
during initial flight testing.

Or maybe better than a squelch threshold might be a LED bar-graph
showing relative magnitude..??

Sid Knox

Velocity N199RS
Starduster N666SK
KR2 N24TC
W7QJQ