What is a Tuned Mass Damper?

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FAQ: (1) What's that physics simulation software called?Algodoo (it's free!).(2) Your music is no good. I didn't nail the mix on this video, but it is fixed on subsequent videos.(3) I want to build my own. Where can I find plans?This wasn't meant to be a "how-to" video, but I put some details about the model at this link: )

TaiPei 101 damper baby... fundamental frequency resonant frequency scale model skyscraper skyscraper engineering tuned mass damper vibration engineering