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A tuned mass damper reduces vibration by

  • A.adding a rigid mass fixed directly to the topmost storey of the structure
  • B.removing mass from the upper storeys of the structure
  • C.stiffening the structure so that its frequency rises
  • D.adding a mass tuned to the structure's frequency and damped against it

Answer: D

The auxiliary mass moves out of phase with the structure and its damper absorbs the energy, which narrows and lowers the resonance peak. Mass ratios of around one per cent are typical, and the tuning has to be maintained if it is to keep working.

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