Simple CrossBar Oscillator

[hansvonlieven]

Sorry Ruggero,

The file must have become corrupt during transfer. The avi on my computer works fine but when I downloaded I had a problem. Will try to upload it again.

Hans

[ruggerodk]

Thank you Hans,...
and if you in the meantime would be kind enough to just show a still image, it will surely be appreciated.

To Fletcher:
Try Quicktime Player download from Apple.com

regards
ruggero ;-)

[hansvonlieven]

It is working now. Just tested it.

Hans

[ruggerodk]

Thanks Hans - I see yhe first AVI now...the pendulum with spring holding a rolling beam/fulcrum, the whole thing placed on a lever.

My comments are:
Firstly I believe the springs are to rigid and the distance for the 'Roller' to roll has to be longer (outer positions further apart).
Secondly, I wonder what physics this software are dealing with, as it is perfectly obvious from the simulation, that the lever does not follow or react normally to displacement of the weight of the 'roller'.

Try doing a simple daily life experiment:

Put some cloth on a hanger and hang it on a rod in the wardrobe.
Give it a slight push, and watch the wondering movement.

regards
ruggero ;-)

If anyone can make a simulation of the Simple Crossbar Oscillator, shown on the top of this thread, I would much appreciate it, thanks.

[hansvonlieven]

If you have a look at my other simulation you can see why your arrangement behaves like this. In this type of arrangement the centre of gravity shifts along the y-axis mainly. In a pure system there is no movement along the x-axis at all. In your arrangement there is some but it is erratic, taking on the chaotic motion reminiscent of a double pendulum.

The softer the springs and the longer the potential movement the more erratic it becomes. The short tight springs dampen it enough to get at least some predictable motion.

That is why I made the second simulation, because I was not quite sure what was causing it. Now I know.

Hans von Lieven

[ruggerodk]

I see your point Hans,

It makes me wonder what happens in your first simulation "newphenomenon"...it also had some spring attachment to the 'rolling' pendulum, right...?

BUT-BUT-BUT....

I would really appreciate if we could go back to discuss the ORIGINAL idea of this thread - no hard feeling Hans, the pendulum or double pendulum spring attachment got some potentional, and deserves its own discussion line.

Remember that (1): the Simple CrossBar Oscillator (InsideTube) is working as two opposing spring connected pendulums
and (2): it is ment to HOLD or GRAB the spring at the most outer stretched position for later release
and finally (3): the release mechanism are controlled to be released when the weight are at a weightless state.

Think of two opposing PoGo's connected to each other....

I still kindly ask anyone to help making a WM2D simulation of this particular design...please.

Best regards
ruggero ;-)

[ruggerodk]

Hi All,

I have taken the liberty to start a thread to discuss the specific design of Hans's experiment with sliding pendulum.

Please go to "New Phenomenon (Sliding Pendulum)" in General Discussion.

I will continue this present thread only to discuss the Simple CrossBar Oscillator.

Best regards
ruggero ;-)

[ruggerodk]

Anyone out there who fancy to help making a WM2D simulation of the Simple CrossBar Oscillator????????

ruggero ;-)