Besslers prime mover and its enabler.

[Roxaway59]

Its in the early hours here Fletcher so I will get to bed but thanks for the help I appreciate it. I will have another look at WM2D tomorrow.
Graham

[ArchCalc]

I use "Tile" to find my keys.

[Fletcher]

Nice tip Archc - or cascade ..

No probs Roxaway-2-sleep - make a quick sim or drawing of what you want and we can have a play with it ..

You can make the COM any innumerable ways to be an inverted pendulum that is top-heavy - the problem is getting the reset to regain GPE after it has rockedaway ..

[Roxaway59]

Hi Fletcher I found the problem in WM2D. You had the single 23g weight set to 230g so the wheel swung like a pendulum from 3 o'clock to 9 o'clock. Switch it back to 23g and you will see it creates a small inverted pendulum. On my WM2D I had to get rid of the mechanism first because it shows the COM of everything.
Graham

[Roxaway59]

I noticed something odd when I was running your file. The air resistance is powering the wheel so I had to turn it off. Try this in yours. Take the sim that you sent me, rotate the wheel with the 230g weight at about 12 o'clock, leave air resistance on and run it. In mine it went over unity until I turned the air resistance off. What do you make of that?
Graham

[Roxaway59]

Just for clarity I will go over what I am attempting to do using screenshots in Algodoo. Will post these shortly.
Graham

[Fletcher]

Hi Fletcher I found the problem in WM2D. You had the single 23g weight set to 230g so the wheel swung like a pendulum from 3 o'clock to 9 o'clock.

Switch it back to 23g and you will see it creates a small inverted pendulum.

On my WM2D I had to get rid of the mechanism first because it shows the COM of everything.

Switched the green counter-weight to 23 gms - my bad - if you add or remove anchors (see blue and red notes) they take mass out of the calculations - so if you anchor the mass parts in the side mech the System COM icon will only measure and show for the wheel .. they were anchored ..

I noticed something odd when I was running your file. The air resistance is powering the wheel so I had to turn it off.

Try this in yours. Take the sim that you sent me, rotate the wheel with the 230g weight at about 12 o'clock, leave air resistance on and run it. In mine it went over unity until I turned the air resistance off. What do you make of that?

I checked my accuracy setting - still at 1,000 fps - but Air Resistance was on LOW as per imported from your original file - shifted the wheel so the counter-weight was at just past 12 o'cl and ran sim - swung like a pendulum - with air resistance on LOW and NONE both times did NOT go over tdc on the swing up ..

[Roxaway59]

Right Fletcher I will try the anchor next time I'm on there as for the over unity thing it must be to do with my version because I don't know whats causing that. You asked if I could clarify what I am doing so I hope this Algodoo screenshot will help. Let me know if it clarifies everything.
Graham

[Roxaway59]

This is obviously important Fletcher because if you can sim this in WM2D and get the same results as I have in Algodoo then that would be significant.
Graham

[Roxaway59]

For anyone who would like to look at this in Algodoo here's the file. Just delete the crosses holding the wheel and the mechanisms to try them out. The accuracy is set high at 4800 and air resistance is on.
Graham

[Fletcher]

This is obviously important Fletcher because if you can sim this in WM2D and get the same results as I have in Algodoo then that would be significant.
Graham

I'm not trying to be flippant, just understand .. here is a very simplified and exaggerated version (not accurate to yours) of what I'm seeing - in short the center wheel has a slightly low and left COM to start with ..

The side views of the mech boil down imo into a balanced bar with the pivot not in the middle but biased to the bottom i.e. beneath the x axis making it balanced but top heavy - after a short pulse torque the lever loses PE and rotates until it hangs below the pivot (bottom heavy) ..

I'm not sure at all if I can sim in WM what you are proposing as the movement in the z axis .. file attached ..

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[Roxaway59]

Ok Fletcher well thanks for taking the time to look at it. I will see if I can do some more simulating in WM2D and try and improve things. In mine the COM is slightly high pointing at 12 o'clock and the wheel turns better than it does in Algodoo. The mechanisms are only suppose to turn slightly till they are in position and if you look at the last video I posted they turn less than the ones on that wheel.
Graham

[Roxaway59]

After my posts yesterday I realized that I may not be making it clear what I am trying to get these mechanisms to do so here is an update on the Algodoo simulation and I have added stoppers which show just how little these mechanisms are falling into position when they are released.
Graham

[Roxaway59]

I am going to post some WM2D simulations and screenshots of the wheel and mechanisms once I have done them so forum members can compare these with the Algodoo simulations.
Graham

[Roxaway59]

Here are some screen shots of the COM on WM2D and as you can see it is pointing at 12 o'clock. The first 2 are a close up of the start then finish and the next 2 show the whole wheel with the start then finish.
Graham