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Damping in a structure causes free vibration to

  • A.increase steadily in amplitude
  • B.change its period continuously
  • C.decay in amplitude with time
  • D.continue unchanged for ever

Answer: C

Correct answer: decay in amplitude with time

Damping removes energy from the system in each cycle, so successive peaks of free vibration are smaller and the motion dies away. The rate of decay is what defines the damping ratio, and measuring it from the logarithmic decrement of a recorded free vibration is the standard experimental method of determining it.

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