Damping Estimation Method Using the Spectral Analysis Technique Based on the Auto-Regressive Model Fitting

概要

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A practical method whereby the damping ratio of a structure subjected to random excitations can be estimated is proposed. This method is based on the characteristics of the AR spectral analysis technique by Akaike. Using good correspondence of the shape of the frequency response function around the dominant peaks in the proposed method to that in the linear structural theory, estimation of the damping ratio to the fundamental vibration modes can be satisfactorily carried out by using curve-fitting technique. As a practical example, the damping ratio for the ground model which is necessarily used for the generation of an artificial earthquake motion is estimated and quite good results are obtained. It is expected that this method will be widely applicable to other technical dynamic problems in which estimation of damping is required.
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