Theoretical Mechanics¶
Strogatz, S. H., Abrams, D. M., McRobie, A., Eckhardt, B., & Ott, E. (2005). Theoretical Mechanics: Crowd Synchrony on the Millennium Bridge. Nature, 438(7064), 43-44.
Cited by¶
2 citations across 2 artifacts.
Each citation links to the sentence it supports in the citing article.
Mechanisms¶
- Anti-Herd Coupling Breaker
- As more people fall into step the sway grows, which makes still more people adjust in time with it: a positive feedback that can drive the lateral motion toward unsafe amplitude, the well-documented hazard behind synchronous crowd loading
This sourceDocuments reciprocal crowd–bridge synchronization as a positive-feedback instability that emerges above a critical crowd size and amplifies lateral sway.
- As more people fall into step the sway grows, which makes still more people adjust in time with it: a positive feedback that can drive the lateral motion toward unsafe amplitude, the well-documented hazard behind synchronous crowd loading
- Phase-Alignment and Staggering Plan
- Its failure mode is over-synchronization: forcing coherence where none is needed makes every activity peak together, concentrating contention and creating a single correlated failure point — the same resonance risk by which independent oscillators, once weakly coupled, can lock into a damaging shared rhythm.
This sourceModels the Millennium Bridge instability as initially independent pedestrian oscillators becoming coupled through bridge motion and synchronizing into a damaging rhythm.
- Its failure mode is over-synchronization: forcing coherence where none is needed makes every activity peak together, concentrating contention and creating a single correlated failure point — the same resonance risk by which independent oscillators, once weakly coupled, can lock into a damaging shared rhythm.
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Registry ID ref:7cfcffa48149 · see in the full table