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I like to promote a discussion regarding what was the cause of the wobble of the millennium bridge that forced the authorities to close it for two years. you can look up videos on YouTube and share them with your comments on this discussion.
The idea is that you are able to answer some of the following questions:
1. What caused the wobble?
2. Which frequency was causing the problem?
3. How did they fix the problem?
4. Any other bridge that has failed? That caused the problem.
5. Any other comment you like to share regarding harmonic forced vibration?