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Froggy
| | Posted on Tuesday, March 27, 2012 - 09:29 pm: | 
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quote:Spinning the bottle at a higher speed would just cause it to rotate more eccentricly, so what would the point be.
Actually it wouldn't, it would smooth out just like it did with the beads. |
Blake
| | Posted on Tuesday, March 27, 2012 - 09:50 pm: |
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If that bottle were scaled up to the size of a tire, it would be vibrating horrendously. The bottle appears to smooth, but in truth is vibrating significantly. It's just not flopping around wildly like at low speed.
Thanks Frank. And excellent call on the effect of increased angular velocity (rate of spin).
Natural frequency matters. At lower speeds close to or at the natural frequency of vibration, the bottle wobbles horribly. As the speed increases above and well beyond that of the natural frequency, the magnitude of displacement and vibration is greatly diminished, almost to the point of appearing that it was eliminated. It wasn't. The bottle is still vibrating harshly, just through a much smaller displacement. |
Blake
| | Posted on Tuesday, March 27, 2012 - 09:56 pm: |
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>>> Let's just agree to disagree on this one.
I can't do that, on account of truth matters.
For reference study up on the theory of vibrations and also look into the energy equations of dynamic systems.
Which requires more energy, an oscillating/vibrating system displacing 0.5 inches at 100 RPM or the same system displacing 0.05 inches at 1000 RPM?
Hint: Dynamic mass energy is proportional to velocity squared. |
Tempest766
| | Posted on Tuesday, March 27, 2012 - 11:19 pm: |
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I'm glad I could contribute to the madness. I think I'm against the concept of snake-oil-beads...I mean dynabeads. |
Beached
| | Posted on Tuesday, March 27, 2012 - 11:51 pm: |
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I know guys who swear by the results after using Dynabeads. All have big sportbikes and good name brand tubeless tires. The shop that mounts my tires says that properly mounted good tires are well balanced probably would not cause any vibration anyway but they always static balance. I have a small balance weight on both wheels. The test for balance for the beads should be done on a dynamic wheel balance machine and even if it does work, conventional balancing is cheaper and it works. Incidentally, Schrödinger's Tire Beads balance and unbalance at the same time, I think. |
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