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theo jansen mechanism Answered

OK, I finally got hold of measurements for theo's strandbeest. these come directly from theo himself which means there accurate however it also means they're not in English. the numbers are there and they're easy to figure out, but it would be nice to know what the paragraph beside them says. so if any can read it, please post a translation. thanks

Discussions

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gedion4000

6 years ago

this should be a better drawing of the leg. hope you can all read them better.

TheoJansenLinkage.jpg
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McMech

7 years ago

Sorry, I know this is an old post but I need to ask. If I were to use these dimensions for a science fair project (Comparing legged to wheeled robots) would I need Theo Jansen's permission?

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KitemanMcMech

Reply 7 years ago

No - they've spread so far around the net, they are basically common knowledge. It would, however, be appropriate to credit him, maybe include a link to his work.

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McMechKiteman

Reply 7 years ago

Thanks, that's what I thought but I didn't want to risk it. I'll make sure to specifically call it a 'Theo Jansen Mechanism'

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MichelMoermans

8 years ago

The following is a direct translation from a 20 year old Belgian who speaks dutch as his mother language (it's me btw ;) ). I kept the translation so directly translated as possible while staying in the context of the text. Hope you enjoy any questions don't feel afraid to ask

Then he would have been busy with that for 100000 years. That much time was not available, therefore he took refuge in the evolutionmethod.

In the computer 1500 legs were created with poles of lengths that were random. The computer looked which legs where close to the perfect walking curve. From those 1500, one hunderd of the best lengths were slected. They got the honor to reproduce themselfs (translation note: evolution so he means "sex to reproduce". There poles where copied and combined to 1500 new legs. These 1500 legs showed a resemblence to there parents and where tested for their comparison to the perfect walking curve. This proces repeated itself for many generations and the computer stayed on for many weeks, months (day and night).
Finally 13 numbers came out, the ones who gave the ideal lengths for the nessecairy poles. The end result was the leg of the Animaris Currens Vulgaris. It was the first walking beachmonster (translation note: beachmonster is the english translation of strandbeest). Yet the Vulgaris resisted heavily against walking. A new computerevolution deliverd the legs of the generations that followed.
Here are the magic numbers: a= 38, b=41,5, c=39,3.... (I didn't want to copy these further)

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larslovespeace

8 years ago

this diagram is on his strandbeest website.

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Groxx

9 years ago

 Holy cow, a million thanks for the numbers!  I've never seen them online before, and I've got a project I want to do with these legs...

I was debating just evolving my own set of numbers, but Jansen's own are known to work, and already done for me :)  I'd never be able to figure this level of detail out of pictures of his beasts, and coming up with the algorithm to evolve them would've been a real pain (and would put me over my time limit for this project).

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mmm1

9 years ago

Does anyone know the diameter of the circle around which the axel rotates, moving the leg? and are these numbers metric or foot/inches?

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Kitemanmmm1

Reply 9 years ago

the metric/imperial question doesn't matter - what's important is the ratio of the various numbers.

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budsiskosmmm1

Reply 9 years ago

i would assume they were in centimeters and the radius of the circle is 15

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benjamander

9 years ago

there are two arrows in the diagram pointing at "vaste punten." Google translates this as "fixed points." I'm going to assume that segments l and a are perpendicular to eachother, making the distance between them sqrt(7.8*7.8+38*38) or approximately 38.8... but if anyone has any insight, I would love to know what you think.

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starwarsfan

9 years ago

I can not read the numbers. can someone post them.

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Kitemanstarwarsfan

Reply 9 years ago

If you click the small i in the corner of the image, you can look at, or download, a larger version.

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westfw

9 years ago

Hey, I sorta know someone Dutch! He kindly provided the following:

...which would take him 105 years. That amount of time was not available, so he switched to the evolution method.

In the computer 1500 legs were created using rods of random length. The computer evaluated which legs approximated the ideal walking curve. Of these 1500 the best 100 were selected. They gained the privilege of reproduction. Their rods were copied and combined into 1500 new legs. These 1500 legs have some liking to their parents and were tested using the ideal curve. This processes went on for many generations and the computer was working for weeks and months (day and night).

In the end 13 numbers evolved, indicating the ideal lengths for the rods. The final result was the leg of the Animares Currens Vulgaris. It was the first walking beach-animal. But still, from time to time the Vulgaris resisted walking. A new computer-evolution produced the legs of the subsequent generations. These are the magig figures: ...

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westfwbudsiskos

Reply 9 years ago

I would not have expected a computer to be involved. Interesting. I wonder if it's one of those things that could be done on a modern home computer in mere minutes...

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n8man

9 years ago

Do not click link, flagged. Can you please keep this site clean and stop posting the link.

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guyfrom7up

9 years ago

Whenever I found the picture (through hours of searching) I was soooo happy. I found it like a year ago. I started translating it, but I got lazy. I think it's in Dutch. All it is is explaining how the mechanism works, like a computer generated it so that the "foot" has a relative flat run along the bottom but it lifts it up after a gait. Don't worry about the paragraph.

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Kitemanguyfrom7up

Reply 9 years ago

Dutch is a good guess - Jansen is Dutch, and his machines stroll around Dutch beaches. You're right, though - the diagram is the gold.