Force from rotating cylinder
Force from rotating cylinder
(OP)
I have a hollow cylinder rotating at about 2800rpm max. I welded the bottom of a small tab to the end of the cylinder, and want to find the force acting on the tab that would bend it away from the cylinder at those high speeds. Any thoughts?





RE: Force from rotating cylinder
My thought is can you post a picture of your situation
RE: Force from rotating cylinder
Centrifugal force maybe? You know the weight/mass and the C.G. of the tab. You know how it is connected to the cylinder. You know the angular velocity of the tab. That ought to about do it.
RE: Force from rotating cylinder
TTFN

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RE: Force from rotating cylinder
http://onlinevib.yolasite.com/vibration-calculator...
It accepted at least 20,000 mils ( 20" diameter ) input
RE: Force from rotating cylinder
Yes it will be like a fixed edge, and then a force at the other end. I don't know how to calculate the "lateral force" though based on the rotation of the drum. Hopefully the picture helps to explain...it is a very simple sketch to just get my idea across.
RE: Force from rotating cylinder
If so, there is no bending force because all the force is in-plane to the tab. I was expecting the tab to the parallel to the tangent of the circle, in which case, the force =V^2/R
TTFN

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RE: Force from rotating cylinder
RE: Force from rotating cylinder
what is it now ? acceleration is w^2*r, mass = m, offset from base = h/2 ... moment = m*w^2*r*h/2
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RE: Force from rotating cylinder
In the orientation you show the tab, it will not have a bending moment under ideal conditions, as Irstuff suggests, the loads will be in the same plane as the tab. But, a thin tab at that angular velocity might likely act as a thin, unstable airfoil, and vibrate off the cylinder in short order. Also, that tab will cause the entire cylinder to be out of balance if that can be a problem.
RE: Force from rotating cylinder
another day in paradise, or is paradise one day closer ?
RE: Force from rotating cylinder
TTFN

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RE: Force from rotating cylinder
That direction would be insignificant to me. However, any bending/vibration in the other direction previously posted would be damaging.
Balancing is not relevant to this question, simply because this is oversimplified.
RE: Force from rotating cylinder
RE: Force from rotating cylinder
RE: Force from rotating cylinder
agree with IR. I thought there'd be some small tangential inertial effect, but not now. there is as the shaft accelerates, as w changes; but not when w is constant.
I think ...
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RE: Force from rotating cylinder
TTFN

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