Jhula principle - increase speed by applying brakes.

[aleks]

Here is a version that should be good to study because a) it is about as simple as I can get and have it running well. b) it is very well balanced. c) we have got best speed (about 120rpm).

So, how much load can you get without system stopping?

[prajna]

12 times more out than in  . No, very little on this scale, I would think.  With heavier weights then more because it is the momentum that is increasing the speed.  Of course the system would have to be rebalanced for the load in order to keep it within its synchronisation band. I think we need to investigate how to widen that band. At the moment we are just overcoming the air resistance but, according to my theory, we change the balance a little so that it tends to accelerate out of sync and apply a load to bring it back in. There will be a limit where the inertial advantage is less than the load. It is a delicate ballancing act between the system accelerating out of sync into a chaotic pattern and decelerating.

If you study the principles of chaos mathematics you should be able to understand this balance. If you have a steady increase in an input to a chaotic system the output is not steady; rather it goes from one stable state to a different stable state and so on until the next state is a chaotic one. Consider a tap (fawcet, for you prisoners of the great satan), as you turn the tap on the water begins to drip out of it. To begin with the drips are slow and regular. As you continue to turn the tap eventually the drips become quicker and regular. Continue to turn and the drips eventually change to very fast but still regular. Eventually the water flows (a chaotic state where one can no loger predict the path of any particular water molecule).  I believe that is a good basis on which to study this model.

[Sataur]

Interesting Prajna.

I was thinking last night over your theory (on your website) about removing energy from a system to allow for more to be produced. It came to me that we are not exactly removing any energy by stopping the pendulum or counterweight from spinning in a certain direction, rather we are just stopping the process of converting potential energy->kinetic energy.

But the interesting thing here is not that. Its that secondary oscillations from pendulums appear to produce more energy output than input. What we should try next is to use your balanced model, apply a load, and then put the energy gathered from that load to reinforce the swinging energy of the pendulum (perhaps this is where the motor or torque functions may come into play). I'll try and tweak some of the scripting to try and simulate this.

Cheers!

[prajna]

Excellent, Sataure.  The theory on my website was an early one.  From watching the random-like movement of the system I got the feeling that if one was to lock the pivot at the right time the energy would be converted from kenetic to potential, just as you noticed.

When you are on a swing you add energy to the swing by swinging your legs as the swing passes its lowest point.  In this system the swing from the pendulum occurs as the pivot is moving in that same direction - it 'swings its legs' at the right time when it is synchronised. However you increase the swinging energy you must make sure it stays synchronous with the rotation of the counterweight. The problem is that a pendulum has a fixed period, so you would need to shorten the pendulum as the rotational velocity of the counterweight increases.

[hartiberlin]

Here is a version that should be good to study because a) it is about as simple as I can get and have it running well. b) it is very well balanced. c) we have got best speed (about 120rpm).

Hi Pranja,
nice model, I just tested it, but there was some kind
of jerky motion at the starting  time...
why is this  ?

How did you exactly build it ?
What parts did you build it with ?
Why do you use 2 different beams, that overlap ?
Why is the rod of the pendulum going through the fixing
of the 2 beams when it rotates ?


Please explain.

P.S: If you set the air resistance to 0.7 kg/m^2
it gets slower,but still runs..

What is an realistic friction in this system.
Can also be other friction components being set,
like point turning friction ?


What about the "optional friction model" under
menupoint "World/Accurancy/More choices"

Must this be enabled or not ?
Many  thanks.
Regards, Stefan.