wobbly
A free canvas demo — play it in your browser, no install. Why the London Millennium Bridge wobbled. Open it in a browser: a crowd walking out of step makes the deck run away anyway, because people leaning against a moving floor are a shock absorber wired backwards. Toggle to the storybook synchrony mechanism and watch it need a different crowd.
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Open the live demo Source on GitHubFrom the README
On 10 June 2000 the London Millennium Bridge opened, filled with people, and started swinging sideways hard enough that some of them held on to the rail. It shut two days later and stayed shut for two years.
Leave the mechanism on negative damping, drag the crowd past about forty people, and the deck runs away. Now look at the phase ring: it is a smear. It stays a smear. Nobody is marching in step, and the bridge is going anyway.
with Arup's measured numbers for the centre span. No synchrony anywhere in that derivation.
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