Great, two clowns again managed to clutter the thread with bs so anyone sincerely looking for understanding has to dig through tons of garbage.
Reposting this
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My main basic approach that always works is accelerating and decelerating
the unbalanced weight AT THE AXIS, similar to shipov
BUT NEVER LET THE ARMS GO BEYOND 180° or even better beyond 90°.
https://www.youtube.com/watch?v=2WoZPvL-9oIAs you can see his weights go full circle and thus device curbs itself.
My idea (not really my idea, it's an old idea and it's good) is the same just you don't let them go beyond 180° EVER.
Similar to this animation i already shared
https://www.youtube.com/watch?v=eeZXNo4EII0When you accelerate the arms from 0 position as in picture below, device will of course accelerate forward.
As each weight crosses the half point motor must start to decelerate them so they stop at opposite side.
Key point being that as motor decelerates the arms it is experiencing back torque and back torque has nothing to do with linear acceleration, it simply tries to spin the cart, since there are two opposing back torques spin is neutralized, like in helicopter.
Centrifugal pull remains. Pure linear acceleration.
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I think most of you have a good understanding and sense for what centrifugal force is.
But still most of you have trouble seeing the simplicity of it's conversion to linear acceleration.
One way to resolve this is imagine yourself stationary in space, there is a mass passing by parallel
to you at certain speed.
Say you throw a lasso and capture the mass as it passes by, what happens.
Of course, due to your own inertial mass, object's trajectory is now curved toward you,
You have deflected it from it's straight path and as a consequence it is now pulling you,
accelerating you as it follows it's new, curved path.What we got here is the same thing in more controlled environment.
Every vibrator is doing it, it's just that it pulls axis to one side, then another.
Pull must be contained on one side.
This is a good video that demonstrates the phenomena. As long as ball keeps oscillating
on the right side, it pulls the cart to the right. That is all there is to it.
https://www.youtube.com/watch?v=tM9tkgjVVrI