Estimation of Modal Parameters of Buildings by Wavelet Transform

Abstract eng:
In this paper, determination of structural dynamic characteristics by wavelet transform (WT), which is capable of yielding time-frequency representation of structural response, is employed. In this application of WT, to achieve optima simultaneous localization in time and frequency domains the shape of mother wavelet has been controlled. For this, modified Morlet wavelet, having two free parameters, was used. The optimum values of these two parameters were obtained by employing an optimization technique which minimizes the entropy of the continuous wavelet transform, while varying these parameters simultaneously. The effectiveness of this algorithm in determination of modal parameters of buildings, especially those having close modal frequencies, was investigated and results is presented in this paper. Moreover the results of WT have been compared with those of AVS and NExT-ERA techniques, especially with regard to the number of identified modes.

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