Re: Is it a "memory" effects?
- From: Bill Ward <bward@xxxxxxxxxxxxxxxxxxxxxxx>
- Date: Sun, 24 Dec 2006 20:47:36 GMT
On Sun, 24 Dec 2006 02:56:17 -0800, top9 wrote:
http://www.oswirus.krakow.pl/cat_14/gyroscope/
A symmetric harnessed gyroscope accelerated to a given spinning
frequency takes different time periods to stop, depending on the
direction of previous spins. For repeated alternating, anticlockwise and
clockwise spinning, the rotation period in both directions significantly
increases, which is not the case when the gyroscope is repeatedly
rotated in the same direction. Using the measurements it was observed,
that the time of gyroscope's rotation was significantly lengthened or
shortened, what indicates that it either increased or decreased the
movement resistance of the gyroscope. The presented experimental results
suggest the existence of anomalous movement resistance and demonstrate
that a fixed spinning gyroscope displays unusual history-dependent
movement resistance effects. The effect is real, large, reproducible and
does not follow from experimental errors.
1. Why not try gas bearings? That would remove any solid-to-solid
contact issues.
2. If the gyro were run in a low pressure helium environment, aerodynamic
drag would be reduced.
3. There was no mention of lubricating the bearings. Was this tried?
There are two obvious, expected, frictional loss terms - fluid friction
(aerodynamic drag), proportional to the square of the velocity, and
solid-to-solid friction, which is closer to linear. What does the
velocity vs time data show as the wheel slows during each run?
The contribution of each mechanism should be easily separable by viewing
the deceleration data as the sum of the two loss terms. Which is the
source of the unexpected effect?
I don't think you have adequately ruled out burnishing effects on the
bearings. I would expect the bearing losses to decrease from their initial
as-machined state. I believe the effect is called "breaking in" in
English. Asymmetry with respect to the previous direction of rotation
would not seem surprising.
With gas bearings, there should be only symmetrical aerodynamic drag, and
any unexpected effects should stand out much more convincingly.
Regards,
Bill Ward
.
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- Is it a "memory" effects?
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