Single Arm Wheel Concept

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Oxygon
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Single Arm Wheel Concept

Post by Oxygon »

This I thought up about a year ago... never went anywhere (dont have a simulator), can't build anything... maybe you guys can test it...

the wheel seems overbalanced 4 out of 8 of the 45 degree motion changes...

Nine is a double of one... ignore

4 out of 8 motions isnt good until you realize that 4 out of 8 are "Null"...

this by itself wouldn't continue...

you would have to pair these up...

perhaps maybe more than four...?
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45degreemotion.jpg
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re: Single Arm Wheel Concept

Post by Oxygon »

Here are more concepts...

they look good!

hope they perform...

p.s. - it feels good to express these...

before I would have kept them to myself...
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slippingarm.jpg
truearmsmall.jpg
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Re: re: Single Arm Wheel Concept

Post by Oxygon »

Oxygon wrote:Here are more concepts...

they look good!

hope they perform...

p.s. - it feels good to express these...

before I would have kept them to myself...
here "slippingarm.jpg" slips out at 10 or 9 o'clock... and back in at 6 o'clock...

I think thats pretty good to get it back in at 6 o'clock!

I havent seen that before...

the "truearmsmall.jpg" image falls outward at 11-12 o'clock and back at 4-5 o'clock... nothing that new, however the method is different...
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re: Single Arm Wheel Concept

Post by jim_mich »

I'll try the 'truearmsmall' on wm2d. It should take about 45 minutes.

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re: Single Arm Wheel Concept

Post by jim_mich »

TrueArmSmall keels.

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Oxygon's TrueArmSmall wm2d by Jim_Mich
Oxygon's TrueArmSmall wm2d by Jim_Mich
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re: Single Arm Wheel Concept

Post by Oxygon »

jim_mich we all owe you a great debt of gratitude... thanks...

Can you run "slippingarm" simulation...

thats my pick of the two...

edit: actually now that I look at it... maybe its not so good...
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Re: re: Single Arm Wheel Concept

Post by jim_mich »

Oxygon wrote: Can you run "slippingarm" simulation...
Sorry, out of time. It's getting late. Maybe tomorrow?

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re: Single Arm Wheel Concept

Post by Jonathan »

I'm sorry I didn't see this earilier, I might have saved Jim some time. The one he did a sim on is like MT24,25.
I didn't understand the first design in this thread, how do the green and black weights move so that the black are always above the green? I think scene three in that sequence is unbalanced the wrong way, and that the device would settle between scenes two and three.
I think the slippingarm design is vaguely similar to MT2-8, but is sufficiently different in it's use of connecting rods and internal ramps/slopes that I look forward to Jim's sim if he gets the time (I don't right now).
Disclaimer: I reserve the right not to know what I'm talking about and not to mention this possibility in my posts. This disclaimer also applies to sentences I claim are quotes from anybody, including me.
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re: Single Arm Wheel Concept

Post by jim_mich »

On the first one here I think you only look at the green balls? The black balls just represent the alternate location and aren't really there?

I'd like to model it. And I've got some other research on electrolysis to do. And a couple computer programs to write. And a fax machine to test and repair. And the house need a second coat of paint. And the grass needs mowing again. And I need to rebuild the porch before winter.

Never enough time!

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re: Single Arm Wheel Concept

Post by jim_mich »

I ran the 'Single Arm Wheel Concept' through wm2d and it keeled badly. Attached are views of the paths traced by each weight and the weights middle point.

I played with it attaching springs at different points and it ran longer before keeling. I found it interesting. I want to work more on this one using different springs.

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PS. The wheel rotates CCW. The pink path is the center of gravity of the two weights. It rests right at the center of the wheel for 1/2 rotation, then moves around the path as shown. Springs can cause it to tip early moving the CG above center on the left side. I'm trying to get springs to keep the CG below center on the right. If you look closely at the pictures you will see that it is just the reverse, lower on the left and higher on the right which is what causes it to keel.
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Oxygon's 'Single Arm Wheel Concept' wm2d by Jim_Mich
Oxygon's 'Single Arm Wheel Concept' wm2d by Jim_Mich
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Re: re: Single Arm Wheel Concept

Post by Oxygon »

jim_mich wrote:I ran the 'Single Arm Wheel Concept' through wm2d and it keeled badly. Attached are views of the paths traced by each weight and the weights middle point.

I played with it attaching springs at different points and it ran longer before keeling. I found it interesting. I want to work more on this one using different springs.
I just want to make sure that you understand it is to be coupled with many more "modules"...

it would "keel" by itself...

I havent drawn a model yet... but maybe this "z" arm pattern my work in a segmented wheel... as fixed connections within... who knows... ;|

I'll draw something...

I am not crossing my fingers, it'll most likely keel... ya never know...

...

Update: notta... same old problem...;(
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re: Single Arm Wheel Concept

Post by jim_mich »

Oxygon, I don't think using more modules would effect it much. Adding a heavy flywheel does about the same thing. Think of a single cylinder lawnmower engine. You don't need twelve cylinders to make an engine work. You just need a flywheel to smooth things out. When I model I start with a light flywheel and see what happens. Then I increase the flywheel weight and see how it effects things. With a heavy flywheel and no friction it may run until the program fills the history file which can at times take 1/2 hour.
Only if modules worked off each other in some way would more than a few be needed.
I still find this idea interesting and hope to spend more time with it.

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re: Single Arm Wheel Concept

Post by Lightwave »

good idea, a crankshaft also uses a counter balance as well as a flywheel
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Re: re: Single Arm Wheel Concept

Post by Oxygon »

jim_mich wrote:Oxygon, I don't think using more modules would effect it much. Adding a heavy flywheel does about the same thing. Think of a single cylinder lawnmower engine. You don't need twelve cylinders to make an engine work...

...Only if modules worked off each other in some way would more than a few be needed...
I have to disagree... I only base my opinion on my "mind's eye" evaluation...

the modules are only in effect less than 50% of the time... so a 5 module combination would suffice...

Also I stopped thinking "fast model" ideas a good while ago... a flywheel may interfere...

Again that is only a gut feeling...
"A man with a new idea is a crank until he succeeds."~ M. Twain.
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re: Single Arm Wheel Concept

Post by jim_mich »

I went to a three module which was complicated enough. I tried a four module but it had weight on top of weight and I got lost as to which was which and could not finish it. This runs a little longer before it keels.

Something I've noticed with wm2d is that when a weight hits an object the wheel (any wheel) slows down. I might assume that wm2d dissipates energy durring a collision? Does this imitate real life world?

But a bouncing ball that collides with a fixed surface does not slow. Just for reference I use no friction figuring that if a wheel model speeds up I've found a gainer and if it slows its a looser.

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re-do using three modules, wm2d by Jim_Mich
re-do using three modules, wm2d by Jim_Mich
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