Announcing: The Dynamic Offset Oscillating Rotational System -- The DOORS
by Tom Sheehan ©2008
http://www.youtube.com/watch?v=2Uahq3Mozf8
This is so easy to make. I came up with it about a week ago.
My PC is slow, so the video is choppy, but you can see how it works and you can easily replicate it in WM2D for yourselves.
Can you please share the actual wm2d file?
Is there a way to do that with the demo version of WM2D?
That's why I like this setup. You can make it from scratch in about 30 seconds!
Nope you can't do that. But I got wm2d for pretty low sum.
I'm trying to replicate it but I can't exactly make it do full turns but it's definitely very active and requires more attention!
Here are some helpful hints:
1. Make the big oscillating wheel super massive.
2. Zoom way in on the small wheel to get the pin closer to the center.
3. Keep trying different spots to drop the oscillating wheel from to start it, trial and error.
4. Or, balance the oscillating wheel on either of the other two wheels and let it roll into place.
GraViTaR, check your pm and yes I'm still trying to find the sweet spot.
Greetings GraViTaR
Well there is only one way to make sure it is not a WM2D effect and that will be for someone to build it. But it looks more like a flywheel effect. Once a heavy flywheel is spun it can spin for a long time with good bearings.
Here is the official final version.
And it turns just as well in this configuration, too!
@GraViTaR
interesting device !
How many KGs of weight did you set the wheels ?
Many thanks.
Regards, Stefan.
Hi All,
I quickly put something together as a WM2D file.
Well, it works infinitely, but only when you disable air resistance.
ButI had enabled Friction model under accuracy.
Hmm,. when air resistance is enabled, it does not work anymore,
so I guess it is a rounding error with WM2D...???
Regards, Stefan.
Here is the file:
http://www.overunity.com/index.php?action=tpmod;dl=get209
Indeed it seems to lose gradually to a pin friction or a counter torque. I wouldn't say this is a bug though, it's just like a pendulum that keeps swinging if there's no friction.
OK, on my new setup with the two big wheels side by side, they start out turning "downwards" onto each other. They start to slow down quite noticeably and after about five minutes they stop completely.
THEN, they start rotating in the opposite direction.
They accelerate and eventually rotate at a rate even faster than they were originally.
They peak out and maintain this more rapid rotation to the very last frame of the simulation.
I'm going to make a video of this.
GraVITar
is it time for a physical simulation?
Throw down the specs and I will build it !![when you are ready]
Chet
This is a screen shot of the final frame with the rotational velocity graph of the large fixed wheel.
You can see how it starts off above zero, then at about two minutes, you can see where it stops then falls below zero into the negative and starts going in the opposite direction.
It steadily accelerates to its peak speed at about 19 minutes and stays there for about two minutes then drops back down slightly and remains there for the duration of the sim, which is where it was for a long time before it reached its peak speed.
It seems as though its acceleration and sustained rotation is a product of resonance, where the system finds its oscillatory/rotational balance and stays there.
This is a video of the first 7:45:
http://www.youtube.com/watch?v=w0NenSh9BHg
Quote from: ramset on December 15, 2008, 09:31:09 PM
GraVITar
is it time for a physical simulation?
Throw down the specs and I will build it !![when you are ready]
Chet
Do you think you could make this? I picture the two outer wheels with convex rims and the middle wheel with a concave rim.
The picture below isn't to scale but should give you an idea of what I mean.
Hopefully, this will hold the freewheel in place. If not, I picture some guiding rollers on the sides of it.
Gravitar
Synchronicity HAS to be maintained for this to work[no slipping allowed?]
Gears would change things ?
Could more drive wheels compensate?
Chet
Quote from: hartiberlin on December 15, 2008, 03:58:38 PM
Hi All,
I quickly put something together as a WM2D file.
Well, it works infinitely, but only when you disable air resistance.
ButI had enabled Friction model under accuracy.
Hmm,. when air resistance is enabled, it does not work anymore,
so I guess it is a rounding error with WM2D...???
Regards, Stefan.
Here is the file:
http://www.overunity.com/index.php?action=tpmod;dl=get209
Stefan, I tried your setup and increased the mass of the oscillating wheel.
It worked with air resistance just fine.
you just have to experiment with different masses for the different wheels, also different locations, angles, etc.
Well,ifyou increase the mass,
you have to make sure it is not just some kind
of flywheel effect.
How many KGs did you make the wheel weight ?
As the wheel then has much inertia, it will
keep on spinning very long to see any change in
WM2D.
So better just try it first with 100 Gramms only weights or so...
Regards, Stefan.
Quote from: hartiberlin on December 18, 2008, 05:24:07 PM
Well,ifyou increase the mass,
you have to make sure it is not just some kind
of flywheel effect.
How many KGs did you make the wheel weight ?
As the wheel then has much inertia, it will
keep on spinning very long to see any change in
WM2D.
So better just try it first with 100 Gramms only weights or so...
Regards, Stefan.
Any gravity wheel is going to be part flywheel, just as windmills are.
I am trying to post a file but it's not working right.
The file has the DOORS accelerating from a reverse state.
It starts off going "backwards", stops, then starts turning in the "right" direction, steadily accelerating the whole time.
Both high air resistance and electrostatics are activated.
The oscillating wheel is 20kg and the rotational wheel is 100kg.
Trying again:
This file has the DOORS accelerating from a reverse state.
It starts off going "backwards", stops, then starts turning in the "right" direction, steadily accelerating the whole time.
Both high air resistance and electrostatics are activated.