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Registered Member #72
Joined: Thu Feb 09 2006, 08:29AM
Location: UK St. Albans
Posts: 1659
Uspring wrote ...
Here's an intuitive way of understanding gyroscopic forces: Imagine a top, made, e.g. from a circular disk, in front of you, the axis being vertical and spinning clockwise. The rim at the right will be moving towards you, the one on the left away from you.
Now tilt the tops axis away from you. The rim on the right will then have an upward velocity component and you need an upward force on the right to generate that. On the left you'll get a downward velocity component and you'll need a downward force there. In total this means, that you need a turning left torque on the axis to account for that. This torque appears only during the tilting motion and will be larger for faster spinning tops, since then the vertical components will be larger.
No way Uspring, there is no way that post will have the effect you desire. I would have thought you'd have learned by now from my failures.
While what you write about gyros is correct, I strongly suspect that anybody who doesn't already grok how they work will have their knowledge or intuition improved by your word picture. The problem is the torque and precession are at right angles. Unless someone gets the effect of an impulse at different phases of circular or simple harmonic motion, the intuitive feeling will still be that torque is along the axis of precession.
I did a thought experiment many years ago which involved whirling a nut on the end of a string in a circle, basically a gyro with no shaft and no bearings, and experimenting with making it precess. Sure enough, it behaves according to gyro maths. If I can video that experiment, or find a version of it on youtube, so a real visual rather than word pictures, then maybe that could advance understanding. There are any number of bike wheels hanging from string, but I don't think those will help nearly as much.
Registered Member #3414
Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245
Dr. Slack wrote ...
. The problem is the torque and precession are at right angles. Unless someone gets the effect of an impulse at different phases of circular or simple harmonic motion, the intuitive feeling will still be that torque is along the axis of precession.
.
One easy way to demonstrate this is with an angle grinder. You can both see and feel what is happening.
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Question About Hybrid (IC + generator) and Rotation.
