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Emergence of collective oscillations in human crowds

nature.com

41–43 of 43 posts

Re: Emergence of collective oscillations in human crowds

#41
post #37

All systems with finite speed of information propagation will produce oscillatory phenomena emergently. Nature is short-sighted Nature is governed by differential equations/local behaviour

Now I wonder if there's some insight to be gained from looking at the crowd behavior in the frequency domain, i.e. through a Fourier transform?

Re: Emergence of collective oscillations in human crowds

#42

Crowds of a high enough density push people in orbital waves, with both clockwise and counterclockwise oscillations pulsing at 18 second intervals through the crowd. Monitoring these motions in realtime is possible and may help prevent crowd crush events. Also: At high densities crowds act like sticky springs, with the ground adding the sticky. 18 seconds before the next wave of people crushes you. 18 seconds to get…

I wonder if we couldn't have the equivalent of the water barrels near the start of guard rails, but for crowds?

Maybe giant inflated or crushable areas around an exit that could take up slack?

maybe tie the crush event with something else, like opening extra doors, turning on lighted warning signs or illuminating exits?

Re: Emergence of collective oscillations in human crowds

#43
post #42

Crowds of a high enough density push people in orbital waves, with both clockwise and counterclockwise oscillations pulsing at 18 second intervals through the crowd. Monitoring these motions in realtime is possible and may help prevent crowd crush events. Also: At high densities crowds act like sticky springs, with the ground adding the sticky. 18 seconds before the next wave of people crushes you. 18 seconds to get…

I wonder if we couldn't have the equivalent of the water barrels near the start of guard rails, but for crowds? Maybe giant inflated or crushable areas around an exit that could take up slack? maybe tie the crush event with something else, like opening extra doors, turning on lighted warning signs or illuminating exits?

Doors with crash bars are kind of that. If there's too many people, they'll push up against them and force them open.
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