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Old Sep 16th 2018, 11:37 AM   #1
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Gyroscope flipped upside down

Hi
Can you tell if is it possible for a mechanical Gyroscope to mantain its original position aften being flipped upside down?
thanks
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Old Sep 16th 2018, 06:08 PM   #2
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Originally Posted by amadeok View Post
Hi
Can you tell if is it possible for a mechanical Gyroscope to mantain its original position aften being flipped upside down?
thanks
You mean return to its original position ???

So first it's axis upright ... then a force is applied and it 'flips' through 180 and its axis is now 'upside down' ....

It is stable in this new position ... has no memory of it's previous position ... and will not move from the new position unless a new force is applied.
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Old Sep 16th 2018, 11:14 PM   #3
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Originally Posted by oz93666 View Post
You mean return to its original position ???

So first it's axis upright ... then a force is applied and it 'flips' through 180 and its axis is now 'upside down' ....

It is stable in this new position ... has no memory of it's previous position ... and will not move from the new position unless a new force is applied.
Lets say there is a gyroscope in an airplane and the airplane makes a turn or flip where the gyro gets upside down and then up again, can the gyroscope mantain its horizontality during and after the flip? Ė
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Old Sep 17th 2018, 12:44 AM   #4
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This is a gyroscope with gimbals


You can see the circle of metal closest to the spinning gyroscope is supported at two points and is free to turn , so is the vertical shaft entering the stand free to turn ... If this were in a plane , no matter how the plane moved the gyroscope is free and will want to maintain the same orientation , and it will , it will not change orientation relative to the Earth , and this is how a gyro compass works ...

This is a gyroscope without gimbals


It looks quite similar , but here the inner hoop of metal is welded to the next one ..no movement is possible. If you were holding this firmly by the top and bottom supports , and the plan flipped , the gyroscope would want to continue as it was , but would be FORCED to turn with the plane , and you , holding the gyroscope would feel the gyroscope resist.
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Old Sep 17th 2018, 09:58 AM   #5
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The "artificial horizon" instrument in an aircrafts instrumentation is essentially driven by gyroscopes.
The older aeroplanes actually use 3 linked gyroscopes
each one spinning on a different axis, at 90 deg. relative to the others.

Even though these are beautiful examples of precision engineering,
there is unavoidably some drift (due to friction etc),
so part of the pre-flight process is to set the alignment of the gyros.

Most modern aircraft now use a "ring laser" arrangement which (having no moving parts) is more reliable.
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Old Yesterday, 12:12 AM   #6
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Hi,
I made this hyro with this game that has a decent physics system, and angular momentum works, but afte flipping it a few times it gets a bit drifted:

I believe this is because of gimbal lock?
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Old Yesterday, 01:17 AM   #7
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I suspect this computer program does not reflect reality well ....

Why are there jets on the flywheels ?? no need for these , and why are these jets firing in the opposite direction ??? they would slow the flywheels.
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Old Yesterday, 02:34 AM   #8
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A couple of thoughts on your simulation.

Physics simulations in game engines often have to use shortcuts, simplifications and approximations to provide the processing speed required.

3D angular orientations are computationally problematic.
They require significant processing time to compute, thus again many game engines use quicker approximations.

Also note that when using the standard Yaw, Pitch Roll angle definitions,
at pitch = 90 degrees, it is impossible to distinguish between yaw and roll.
As pitch approaches 90 degrees the Yaw & Roll calculations become computationally ill conditioned
a small difference in the input values gives a large difference in the output.
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