rotational vibration
What happens when you change the tension on the fan drive belts? If they
are
implicated at all, that'll change the resonant frequency. It's a bit far
to
drive over to Blighty so we can instrument it up and workout where the
resonance is :-(
Mark Rand (Did similar work on power station foundations once)
ETFM
I've never tried that. I keep the eight belts pretty tight, 1/2" deflection
in the three foot between pulley spacing. can't go tighter, I'd take out
bearings. What do you think running loose would do? Not much margin here, I
smoked all the belts once, pretty spendy to rebelt this unit.
Karl
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