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In Reply to: Vibration and isolation - long comments posted by David Aiken on March 23, 2003 at 14:15:02:
Hi David,Interesting.
I have to spend a little time digesting this.
"Below that 1.4 times the resonant frequency, however, the isolation device actually magnifies the vibration it passes, peaking somewhare around 0.7 times the resonant frequency of the spring and then reducing back to no magnification at 0 Hz."A question then. Why is the peak at "0.7 time the resonant frequency" and not at the resonant frequency? (Looking at figures 4 and 5 in Shannon's article.)
Thanks David.
Follow Ups:
Barry,I didn't have my copy of the article in front of me and I was trying to remember the shape of the curve. What I remembered was a diffeent curve I'd seen somewhere -obviously for something else - and I had my brain on remote and took a guess at how far along the scale between ) and 1.4 times resonant frequency the peak fell. For some reason I was visualising a bell curve and the shape is nothing like that. Put it down to a "senior moment" .
It has to peak at the resonant frequency and that's what the graph shows. After all, the resonant frequency defines when it really resonates the most.
Stupid me.
Hi David,"It has to peak at the resonant frequency and that's what the graph shows. After all, the resonant frequency defines when it really resonates the most."
Yes.
(Okay.)
"Stupid me."No.
(Could happen to any of us.)
Happy Listening!
Barry
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