Sustained torsional oscillation
Sustained torsional oscillation
(OP)
Anyone has ideas on effective countermeasures?
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Sustained torsional oscillation
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RE: Sustained torsional oscillation
prex
http://www.xcalcs.com : Online engineering calculations
http://www.megamag.it : Magnetic brakes and launchers for fun rides
http://www.levitans.com : Air bearing pads
RE: Sustained torsional oscillation
RE: Sustained torsional oscillation
(or even worse, "harmonic dampener")
RE: Sustained torsional oscillation
RE: Sustained torsional oscillation
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(2B)+(2B)' ?
RE: Sustained torsional oscillation
RE: Sustained torsional oscillation
Stop twisting it back and forth.
RE: Sustained torsional oscillation
RE: Sustained torsional oscillation
"Dog bones"
i.e. dog bone inertial dampers.
Or something on that principal.
JMW
www.ViscoAnalyser.com
RE: Sustained torsional oscillation
It is easier to damp higher frequencies so increasing stiffness and adding damper will help.
ht
RE: Sustained torsional oscillation
You should know if it's more practical adding or removing mass or stiffness, specially since you have provided preciously little information on your problem.
The dumbest solution is adding mass. If this is a rotating shaft, make sure it remains equilibrated, that is: add something symmetric across the shaft, or equal weights on diametrically opposite sides; and either add that at the exact axial position of the center of mass of the rotor, or if you can't place it there, equilibrate two sets at either sides of the center.
RE: Sustained torsional oscillation
Peter Nachtwey
Delta Computer Systems
http://www.deltamotion.com
RE: Sustained torsional oscillation
The third link is to C-flex spring dampener. We use this approach in a lot of machinery with relatively small size and low loads .
http://www.schroedersteering.com/HomePage.html
http://www.swayaway.com/TechRoom.php
http://www.c-flex.com/brochures.html
RE: Sustained torsional oscillation
RE: Sustained torsional oscillation
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(2B)+(2B)' ?
RE: Sustained torsional oscillation
If it's impossible to get the natural frequency out of the operating range, dampers may be used. However damping is difficult to quantify, so it's preferred to avoid resonance.
RE: Sustained torsional oscillation
Would a longer shaft intended to reduce shaft stiffness be a viable option?
AKA "quill shaft". Commonly used to avoid TVs by lowering the resonant frequency.
Engineering is the art of creating things you need, from things you can get.
RE: Sustained torsional oscillation
1: Link to a producer of composite shafts.
2: A paper on composite shaft vibration. You may have to order the complete paper from Linda Hall Library.
http://www.bactechnologies.com/shafts.htm
RE: Sustained torsional oscillation