NUMERICAL PARAMETRIC STUDY ON INTERVAL SHIFT VARIATION IN SIMO-SSTD TECHNIQUE FOR EXPERIMENTAL MODAL ANALYSIS (EMA)

Ahmad Fathi Ghazali, Ahmad Azlan Mat Isa

Abstract: SSTD (Single Station Time Domain) technique is one of the efficient methods used to extract modal parameters of a structure. Instead of extracting the parameters in frequency domain by utilising Fast Fourier Transform (FFT) as used by some other methods, this technique only relies on free decay responses to obtain the required parameters. In this paper, a parametric study on time shift interval on algorithm method is investigated. The accuracy assessment is made using simulated analytical data with known properties where percentage error between the results of simulated and this method can be calculated and compared.

Keywords: SSTD (Single Station Time Domain), FFT, EMA

DOI: https://doi.org/10.15623/ijret.2014.0312025