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More interesting reading around "Tuned Mass Dampers" http://en.wikipedia.org/wiki/Tuned_mass_damper

The first I had heard of a tuned mass damper was in the installation on Taipei 101. There's a good video of it moving that gives you an idea of just how colossal these things are: https://www.youtube.com/watch?v=NYSgd1XSZXc

What I also find very interesting are the "tuned column liquid dampers", which applies the same idea of "tuning" the period of the liquid system to one period of the structure. They are found to be very effective in dissipating energy after seismic events or constant wind. I'm a civil engineering student (currently writing my thesis) and I just loved this systems when I learned from them.

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