Interval shift variation´s effect on modal analysis extraction method accuracy using SSTD technique

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 study on time shift interval on algorithm method is investigated. It is found that altering specific settings could improve the accuracy of natural frequency and damping ratio of a structure. 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.