Questions tagged [gyroscopes]

The tag has no usage guidance.

1
vote
2answers
30 views

Angular momentum and Gyroscopic precession of a top [on hold]

A top is spinning in the counterclockwise direction as seen from above. Its axis of rotation makes an angle of 15º with the vertical. If frictional forces can be neglected, which of the following is ...
1
vote
1answer
40 views

Nutation frequency for a weighted gyroscope

So, I've been led to believe that the frequency of nutation of a gyroscope can be calculated using the formula In which the I's are the moments of inertia around the principal axes and omega-3 is the ...
0
votes
1answer
45 views

What is the rate at which a precessing top falls over?

From the following equation from hyperphysics, as rotational speed $\omega$ decreases, precession speed $\omega_p$ increases. However, from what we observe physically, as rotational speed of the top ...
1
vote
0answers
29 views

Query about why there is a torque on this spinning ring in a magnetic field

We learnt in class that the $\vec m\times \vec B$ is the torque of a current loop in a magnetic field. I was trying to understand this by considering the diagram above. Let the B field be pointing in ...
0
votes
0answers
10 views

Looking for ways to transform time-series data recorded from object movement into equation describing the movement direction of the object

Looking for some time-series data transformation advice! I want to know what's the best way to transform data of 9-tuples time series data of IMU (Inertia Measurement Unit) sensor, recorded from a ...
0
votes
2answers
47 views

Impulse on a Gyroscope

I've been studying gyroscopes, and I understand why a fast spinning gyroscope doesn't fall. However, I don't understand why a slow spinning gyroscope does fall, or why a large enough impulse to a fast ...
0
votes
2answers
58 views

What happens energy-wise if you put a gyroscope at the north pole?

I had an idea for energy generation: put a gyroscope at the north or south pole connected to a dynamo or similar. The idea was that when the gyroscope resists the Earth's rotation, it would drive the ...
0
votes
2answers
143 views

Why does the gyroscope not move upwards?

I have been watching a lot of videos on gyroscopes. Everything I see says there are two steps in gyro precession: Gravity pulls down imparting a torque The gyroscope moves forward It seems to me ...
0
votes
0answers
22 views

what happens when you put two gyroscopes on one an other?

if a gyroscope stays spinning where ever its out what happens when you put one on another one would they both drop to the floor spinning?
0
votes
1answer
46 views

Is a reference frame fixed (without rotation) on a precessing gyroscope an inertial frame of reference?

Let's say we put a human in a closed chamber which is going around a certain point at distance d from its center of mass at some angular velocity w. The centrifugal force on a human will be w squared ...
0
votes
1answer
53 views

A spinning pendulum [closed]

I just thought of a scenario : We rotate a sphere that is hanging from a string about vertical axis and then allow it to oscillate like a pendulum . Will its time period differ from a sphere ...
1
vote
0answers
24 views

Would you feel inertial forces if you were inside a precessing gyroscope?

If a gyroscope is placed orthogonality on an physical axis which is paralel to a gravitational field if you're in a reference frame of the gyroscope do you have to modify Newton's law?
0
votes
0answers
29 views

Gyroscopes - Uniform precession - Externam forces

Suppose that you have a gyroscope with revolution symmetry around a perpendicular axis $\bf{e}$ such that the inertia tensor of this gyroscope can be written: $${\bf{Jc}} = {A\bf{I}} + (\Gamma - A)\...
-1
votes
1answer
57 views

Kinetic energy of a gyroscope toy [closed]

Why the energy only has rotational part $\frac{1}{2}I_1\omega_1^2+\frac{1}{2}I_2\omega_2^2+\frac{1}{2}I_3\omega_3^2$? The center of mass also moves in general.
1
vote
1answer
47 views

What happens when you try to turn a gyroscope with high torque?

I apologize for my lack of basic understanding of gyro-physics, I tried looking up internet, but couldn't find any answer for this particular question. I have been told that if I apply torque to the ...
0
votes
1answer
44 views

Gyroscopic precession on a friction-less surface

I am having trouble understanding the total energy for a heavy spinning symmetric top (Gyroscope) on a friction-less surface. I am trying to understand it via the Lagrangian of the gyroscope. My ...
4
votes
0answers
115 views

Lagrangian of the Euler equations - why are Lin constraints required?

The following equation describes the motion of a rigid body rotation, such as a gyroscope: $$ \frac{d\textbf{L}}{dt} ={\bf{\tau}}= \textbf{r}\times m\textbf{g}= {\omega}\times \textbf{L}$$ where $...
0
votes
1answer
127 views

Accelerometer readings

Good Night. I have a implemented a accelerometer, a gyro and a Magnetometer in raspberry pi. I want measure the linear acceleration (acceleration without gravity) but i don't know how to do it or if ...
1
vote
2answers
344 views

How is a perpendicular angular momentum origin in gyroscopic precession?

Assume in the given diagram, $\theta = 0$, for sake of simplicity Then, I understand there exists an initial angular momentum in the y-direction and a torque in the X direction of the gyroscope. This ...
2
votes
1answer
59 views

Does the weight of a spinning gyroscope change how much weight it can sustain (stabilize)

Hello I recently watched a video about gyroscopes and I wonder what changes the amount of mass it can keep upright. EDIT: I did search online but I couldn't find a website which explains this in a ...
0
votes
2answers
150 views

If a gyroscope is provided a torque in space, what will its motion be after the torque ceases to act?

As there will be no energy dissipation, where will the kinetic energy of precession go as the gyroscope can't precess in the absence of a torque? Thanks in advance!
0
votes
1answer
43 views

Stability of differently shaped gyroscopes

1) Would it be correct to state the following: "The longer the radial distance (the distance from the center of the gyro disc) and the lower the height from ground to disc, the greater the angular ...
1
vote
3answers
174 views

Is it possible to understand the Gyroscope Effect Intuitively?

A stationary wheel, with its axis tied only at one end, falls down, but a rotating wheel, with its axis tied only at one end, doesn't fall down. The explanation given everywhere is by the ...
0
votes
1answer
382 views

Gyroscopic precession - Angular momentum in vertical direction

In the classic example of gyroscopic precession, the wheel starts to process, and now acquires a angular moment also in the vertical direction. Initial angular momentum was in a single plane. The one ...
0
votes
1answer
193 views

How do I calculate size/weight/spinrate of gyro needed to pull with a certain amount of force?

I have a project.. I've got a survey leveling rod which is about 8 feet high, 2 inches in diameter and about 8.5 lbs in weight. I'm envisioning a pair of gyroscopes that attach to the center of the ...
1
vote
0answers
59 views

The flyby anomaly, rotation, and gyroscopes: help understanding the theoretical connection

The flyby effect in spaceflight is described in the question Is the Flyby Anomaly still a thing? It is an very small unexplained acceleration seen in some spacecraft trajectories during flyby ...
0
votes
1answer
60 views

Gyroscope physics

I'm not a physics student, but am attempting to better understand gyroscope physics. Also my first post here. So, I'm looking at this site, at the second diagram with F_1 and F_2, and reading the ...
1
vote
1answer
246 views

How does a gyroscope flip?

Consider a gyroscope which is hanging with a string. Is it possible to $flip$ the orientation of the a gyroscope by oscillating the point of suspension? How does it come out mathematically?
2
votes
0answers
33 views

Effects on Niven Ring Around Kerr Black Hole

Suppose I have a Kerr black hole (rotating, uncharged) and I build a giant ring (a "Niven Ring") around it. I am interested in two related scenarios (I am confused about the second, but am also ...
1
vote
0answers
33 views

How can non-body-fixed angular velocities can be approximated by co-moving ones?

When reading a paper about magnetic bearings, I have stumbled upon the following ansatz which I don't fully grasp (page 3): For a general body, the Euler equations are given in a body fixed ...
3
votes
1answer
573 views

The moment of inertia of a spinning gyroscope assembly

Moment of Inertia (MOI) is typically used to describe a rigid body, so I don't know how well I can express my question in those terms. However, it seems like the best framework for getting at my issue....
0
votes
2answers
195 views

Can/Does angular momentum apply a torque?

Context I'm a psychologist and I'm interested in perception of gyroscopic forces. For that reason, I'm having to think about many of the classic issues relating to gyroscopes in reverse. That is, ...
0
votes
1answer
99 views

How to relate spin speed and time in which a gyroscope falls beyond some angle?

Usually physics books calculate the precession rate of a gyroscope when its momentum wheel is spinning "fast enough." I am looking for an equation to calculate the wheel speed whereat a gyroscope "...
1
vote
1answer
30 views

Could a weighted ball hung from center of cockpit serve as basic bank indicator?

I have always wondered what that string in the windshield of a glider was used for: https://en.wikipedia.org/wiki/Yaw_string Got me thinking. If you hung a weighted string from inside the cockpit (...
1
vote
1answer
287 views

Angular velocity - Gyroscope

I am currently researching the gyroscope on my own and i came across the concept of angular velocity. The torque ($T$) on a gyroscope is caused by $R\cdot F$, where the force i consider it to be ...
1
vote
0answers
195 views

Dynamics of a Gyroscope motion

If we take a gyroscope with a spinning rotor and rotate the gyroscope frame about a vertical axis or the spin axis (see reference figure), we notice that the gimbal+rotor flips about the gimbal axis. ...
3
votes
1answer
240 views

A question about the tennis racket theorem with degenerate eigenvalues $I_1, I_2 , I_3$

If a rigid body has a symmetry such that two of the principal moments of inertia are equals, i.e. $$I_1=I_2> I_3 \qquad{\rm or}\qquad I_1>I_2=I_3.$$ Are the rotations around to the principal ...
1
vote
1answer
67 views

MEMS gyro measured angular velocity vector

Notations I use: Consider a world frame $\{O_0, \vec{i}_0, \vec{j}_0, \vec{k}_0\}$ coordinate system and a rigid body $B$ with a coordinate system $\{O_1, \vec{i}_1, \vec{j}_1, \vec{k}_1\}$ attached ...
1
vote
0answers
70 views

What causes certain spinning tops to flip? [duplicate]

Certain spinning tops flip upside-down once spun sufficiently high, as shown in this video. Suppose I have the following: A cylindrically-symmetric top The principal axes of a given top's moment of ...
1
vote
1answer
522 views

Why can't I use a gyroscope/accelerometer only as a compass?

I am seeing this from the usual smartphone sensors. These sensors (Android here e.g.) take the magnetic field data as input. That is okay, but some phones do not have a magnetic field sensor (they ...
0
votes
1answer
22 views

Is Gyroscopic precession relative to the object in precessions axis of movement when there is drag imposed on the disc?

Does my question make sense? I am referring to the disc of an AutoGyro aircraft. Though the fuselage of a modern pusher AutoGyro will weather vane into the wind, the disc that provides lift does not. ...
3
votes
1answer
654 views

Flat Earth experiment, but with gyroscope

A man conducted "an experiment" (quotes really, really necessary) to prove that earth is flat. Here's a link. He used a spirit level, set it up before takeoff and expected the level to be tilted after ...
0
votes
1answer
73 views

Non-constant angular momentum in gyroscope?

I want to ask about a simple gyroscope experiment: the one in which a man is holding a gyroscope, and sits on a rotating chair, and when he rotates the gyroscope, he himself starts rotating in regard ...
7
votes
2answers
345 views

Feynman's disk paradox used as a gyroscope?

I have recently learned about Feynman's disk paradox, where angular momentum is stored in the properties of the electric field. One example would be a coil with current going through whose axis is ...
3
votes
2answers
352 views

How does a gyrocompass in a moving craft sense the Earth's rotation?

Various descriptions of gyrocompasses that I can find (such as the Wikipedia article) claim that the compass will seek to align itself with the earth's rotational axis. I think I can understand how ...
1
vote
1answer
119 views

Why does gravitational torque on a precessing gyroscope turn the spin momentum instead of making the gyroscope fall?

I read in a physics book that given the spin momentum is high the torque will turn the spin angular momentum instead of making the pendulum fall. What law governs this??
1
vote
1answer
208 views

Is it possible to “override” the Earth magnetic field locally? [closed]

For a mobile application I am developing I would like to know which direction the phone is facing. In the outdoor we can of course use the magneto meter in combination with a gyroscope. However, ...
0
votes
1answer
997 views

How to calculate accurate yaw using Magnetometer and Accelerometer

I'm currently using mobile device accelerometer+gyro+magnetometer attitude to get roll, pitch, and yaw. However, yaw is drifting and becoming not accurate over time. I read there is a way to ...
0
votes
1answer
72 views

What are the limits of gyroscopes in producing momentum?

I was reading a little bit about how gyroscopes can be used to store and release angular momentum, and that got me thinking about a device from the recent William Gibson novel The Peripheral. In the ...
3
votes
1answer
1k views

Gyroscope's motion explained by internal forces

I'm having a hard time trying to figure out the inner mechanisms behind a gyroscope's precession and nutation. To be very specific, I want to consider gyroscopes like this one: My point is: all ...