Can a 3-axis gyroscope assembly resist movement in all directions?

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In summary, the conversation discusses the behavior of gyroscopes and the potential effects of assembling multiple gyroscopes in different axes. There is some disagreement about whether the resulting device would behave as a single gyroscope or not, but it is agreed that it would not resist translational motion. The conversation also briefly touches on using gyroscopes for stabilization purposes.
  • #1
PH7SICS
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Hi everyone, 1st post on this forum and I have a question about gyroscopes

I have noticed that a gyroscope wheel if spinning rapidly will resist motion along the plane of the axis or spindle of the spinning wheel. For example if the wheel is horizontal and you try to move it in a vertical direction you can feel that there is a resistance to that motion.
My question is if you were to assemble 3 gyroscope wheels so that the axis of each wheel were along the X, Y & Z planes would the resulting assembly resist motion in all directions or would the result be that there would not be any resistance to movement in any direction, assuming that all wheels are of the same value and of equal rpm.
 
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  • #2
They would cancel each other out (via forces in the interconnecting structure), and you would not feel the resistance of "precession" anymore.

Here's an introduction to precession for more info:

http://en.wikipedia.org/wiki/Precession


< EDIT -- Turns out I was wrong in the above assumption -- there will still be a net vector angular momentum in an x-y-z gyroscope. See the following posts. >
 
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  • #3
berkeman said:
They would cancel each other out (via forces in the interconnecting structure), and you would not feel the resistance of "precession" anymore.

I don't agree. In fact gyroscopes DO NOT oppose to rotation. They just rotate in a direction different from what "normal" objects do. You can "force" a gyroscope to turn in any direction.
But when you do it, you realize that the forces (in reality the torque) that you are actually applying are not what intuition predicts.

When you put three gyroscopes in X, Y and Z, their angular momentum add vectorially and the sum is never zero. The resulting object behaves as a gyroscope whose angular momentum is the sum of the moments. It is not simple to treat each gyro and its forces separately. I have never tried.
 
  • #4
I counter disagree. Gyroscopes tend to resist changes to its orientation due to its the angular momentum. By resist, I don't mean you cannot change their orientation, but that it will require more force than if it were not spinning.

I do agree that the addition of the angular momentum of 3 perpendicular gyroscopes would result in a non-zero sum.

Back to the original post: With that last note in mind, by having three gyroscopes built into one, you would only be creating a new device that behaves exactly like a single gyroscope.
 
  • #5
mezarashi said:
I counter disagree. Gyroscopes tend to resist changes to its orientation due to its the angular momentum. By resist, I don't mean you cannot change their orientation, but that it will require more force than if it were not spinning.

As you like.
 
  • #6
Using right hand rule, assume that the angular momentum vectors point forward, left, and up. The sum of these vectors would point 45 degrees left of forward and 45 degrees up, with magnitude of the square root of the sum of the squares of each magnitude. If all magnitudes are the same, then it would be SQRT(3) x the magnitude of one of the vectors.

Angular momentum vectors can't cancel each other if they are perpendicular to each other. Some parallel and opposing components between two or more vectors is required.

A link for almost everything you might want to know about gyroscopes, as a series of videos of lectures.

http://www.gyroscopes.org/1974lecture.asp
 
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  • #7
Thank you everyone! Are we all agreed then that the resulting device would behave like a single gyroscope and will not resist motion in the X, Y& Z planes?
 
  • #8
PH7SICS said:
Thank you everyone! Are we all agreed then that the resulting device would behave like a single gyroscope and will not resist motion in the X, Y& Z planes?

NOOO! We all agree that the new object will behave as a gyroscope!
No one said this: will not resist motion in the X, Y& Z planes.
As any gyroscope, it will not resist rotation motion whose axe is parallel to the resultant angular momentum.
 
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  • #9
lpfr said:
NOOO! We all agree that the new object will behave as a gyroscope!

Sorry, that is what I meant, the device would behave as a regular gyroscope ie a single gyroscope?
 
  • #10
Ouf! That's better!
 
  • #11
Thanks for THAT link jeff, I must have missed it before.
 
  • #12
lpfr said:
NOOO! We all agree that the new object will behave as a gyroscope!
No one said this: will not resist motion in the X, Y& Z planes.
As any gyroscope, it will not resist rotation motion whose axe is parallel to the resultant angular momentum.

Also, as any gyroscope, it will not resist any translational motion...
 
  • #13
vanesch said:
Also, as any gyroscope, it will not resist any translational motion...
Also, as any anything, it will not resist any translational motion...
 
  • #14
vanesch said:
Also, as any gyroscope, it will not resist any translational motion...
Better stated as: it will not resist any translatonal motion any different than any object with the same mass. It still has momentum relative to it's mass.
 
  • #15
Jeff Reid said:
Better stated as: it will not resist any translatonal motion any different than any object with the same mass. It still has momentum relative to it's mass.

Correct.

.
 
  • #16
If you have two Gyroscopes rotating on the same axis in opposite directions would it change the resistance?
 
  • #17
Rockmore said:
If you have two Gyroscopes rotating on the same axis in opposite directions would it change the resistance?

Then there is no net angular momentum, so it would not act as gyroscope.
 
  • #18
Rockmore said:
If you have two Gyroscopes rotating on the same axis in opposite directions would it change the resistance?
The external resitstance would be the same as zero angular velocity (not spinning) of the gyroscopes, but internally there would be large and opposing torques on the common axis between the 2 gyroscopes in reaction to any rotation component perpendicular to the axis. It would have to be a strong connection or else it would break.
 
  • #19
gyroscopes staying level

I want to make a gyroscope stabilizer for my video camera. If I make a gyroscope with a horizontal rotation using a small electric motor and start the gyroscope exactly level to the horizon will it remain level or will it begin to drift at some point?
 

1. How does a 3-axis gyroscope assembly work?

A 3-axis gyroscope assembly consists of three gyroscopes that are positioned orthogonally to each other. These gyroscopes measure the rotational movement of an object in three different directions, known as pitch, roll, and yaw. The combined measurements from these gyroscopes allow for accurate tracking of an object's movement in three-dimensional space.

2. Can a 3-axis gyroscope assembly resist movement in all directions?

Yes, a 3-axis gyroscope assembly is designed to measure and resist rotational movement in all three directions. This is achieved through the use of three gyroscopes that work together to accurately measure and counteract movement in all directions.

3. What type of movements can a 3-axis gyroscope assembly resist?

A 3-axis gyroscope assembly can resist rotational movements such as rotation around the X, Y, and Z axes. This includes pitch, roll, and yaw movements, as well as any combination of these movements.

4. How accurate is a 3-axis gyroscope assembly in measuring movement?

The accuracy of a 3-axis gyroscope assembly depends on various factors such as the quality of the gyroscopes, calibration, and external factors like vibrations. However, in general, these assemblies can provide precise and accurate measurements of rotational movement in all directions.

5. Can a 3-axis gyroscope assembly be used in any type of object?

Yes, a 3-axis gyroscope assembly can be used in a wide range of objects, from small electronic devices to large vehicles. As long as the assembly is properly calibrated and installed, it can effectively measure and resist movement in all directions for various applications.

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