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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



9 years ago

TRANSLATION OF THE DUTCH TEXT: Enjoy and thank you for sharing the magical numbers! :-)

Then it would take him one hundred thousands of years. So much time wasn't available hence I took my refuge into evolution.

In the computere were fifteenhundred legs created with random lenghts. The computer sorted out which legs converged to the ideal walking curve. Out of the fifteenthundred were the hundred best selected. They received the privilige of to reproduce. Their little rods were copied and combined to fifteenhundred new legs. These fifteenhundred legs showed common characteristics with their parents en were tested upon their equality with the ideal curve. This proces went on for many generations while the computer running for weeks and months, day and night.

Eventually thirtheen numbers was the outcome of the evolutionary proces whom indicated the ideal lengths for the required rods. The final result was the leg of Animaris Currens Vulgaris. It was the first walking strandbeest. Yet the Vulgaris resisted from time to time heavenly to walk.

A new computer simulated evolution resulted into the next generation's legs.
Here are the magic numbers: a = 38, b = 41.5, c = 39.3, d = 40.1, e = 55.8, f = 39.4, g = 36.7, h = 65.7, i = 49, j = 50, k = 61.9, l = 7.8, m = 15


11 years ago

I don't read Dutch, but with help from babelfish, I got at least an approximation of that paragraph. He explains his genetic algorithm for generating the ideal step curve/shape. 1500 sample lengths were randomly generated, then assessed for fitness. The 100 best were kept, then combined with another 1500 random samples, to give iterations based on the fittest. This cycle was repeated day and night for weeks by the computer to arrive at these "magic numbers". The most important piece of Dutch on the sheet here is "vaste punten" on the diagram, which is indicating the fixed points (the hip pivot and the crank axle)