Analysis of viscous, Coulomb (friction), and hysteretic damping.
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The group on the footbridge celebrated after the last bolt was torqued. They shared chai, and someone produced an improvised speaker. They played a recording of the bridge before and after. The before sounded anxious, a child on a radiator; the after, composed and measured. It was not a triumph of numbers alone but of attentive care—a town listening to the secret conversations of its own infrastructure and answering back. Analysis of viscous