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The difficulty of modal parameter extraction of the particular bridge under study increased with the increase in speed due to decreased excitation time.
Power mode shapes possess similar shapes to conventional mode shapes but are obtained by basing them on signal power spectral densities without any modal parameter extraction.
Then a frequency-domain poly reference modal identification scheme by coupling the cross-correlation technique with conventional frequency-domain poly reference modal parameter extraction is presented.
The signals of the nodal locations can further be utilized to determine the relative flexibilities through the modal parameter extraction methods, considering signals which are either stationary or nonstationary.
In the present study, since the recorded signal is nonstationary as excitation is nonstationary, the extracted modal parameters and their derivatives are always in question if FFT is used for modal parameter extraction (Qiao 2009; Gu 2010; Yu and Giurgiutiu 2005).
Only the structural displacement response in free vibration condition need to be measured and as the input to the modal parameter extraction algorithm such that all of the structural modal frequencies and mode shapes of the system can be determined successfully.
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Classical modal parameter extractions usually require measurements of both the input force and the resulting response in laboratory conditions.
Thus, real modal parameters are extracted from complex modes by some efficient mathematical equations.
Then, structural modal parameters are extracted from the low damping response signal by ICA.
Operational modal analysis is the primary tool for modal parameter identification in civil engineering.
Study the best parameter extraction.
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