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Pseudo-acceleration differs from true peak acceleration of the mass in that it is

  • A.always numerically larger than the true value
  • B.independent of the damping assumed
  • C.derived from the peak displacement and the period
  • D.measured directly by an accelerograph on the mass

Answer: C

Pseudo-acceleration is the spectral displacement multiplied by the square of the circular frequency, so it is exactly the quantity that gives the elastic force in the spring. For small damping it is very close to the true peak acceleration.

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