Cepstral analysis applied to identification of longitudinal vibration in timer piles

摘要

A method for field measurement of timber pile length in bridge foundations is possible by determining the natural frquency spacing between consercutive resonant peaks in the longitudinal freqnency response function (FRF) as well as experimental determination of the longitudinal wave speed. The measurement procedure relies on vibration modes excited through the attachment of small actuators driven with random input and the recorded response of attached accelerometers.