SIGNAL ANALYSIS DEVICE, EXCITING FORCE MEASUREMENT SYSTEM, SIGNAL ANALYSIS METHOD, AND PROGRAM RECORDING MEDIUM

摘要

In order to highly accurately derive exciting force in a high-frequency range produced in a structure, this signal analysis device is provided with: a forcibly excited vibration analysis means for deriving an acceleration frequency response characteristic on the basis of a forcibly excited vibration component of time history data of acceleration vibration response from an observed target that has been excited; a damped free vibration analysis means for deriving a frequency response function of the observed target, from a vibration amplification factor calculated on the basis of the damping ratio of a damped free vibration component of the time history data of acceleration vibration response; and an exciting force frequency characteristic deriving means for deriving the frequency characteristics of exciting force, by dividing the acceleration frequency response characteristics by the frequency response function of the observed target.