Abstract Summary
When performing modal identification of structural systems, the main goal is to accurately extract the modal properties from the measured vibration data. The system identification can be carried out either in time or frequency-domain depending on the primary data used in the identification process, i.e., a time-domain free decay or frequency-domain function. In this paper a novel system identification technique formulated in the frequency domain is introduced. The technique consists of a frequency domain method entitled poly-refence Complex Frequency formulated in Modal Model (pCF-MM). The idea behind the formulation of such approach is to derive an eigenvalue problem by comparing to the frequency-domain function (e.g., the Half Spectrum (HS) or the Frequency Response Function (FRF)) evaluated at two neighbouring frequency lines. In order to illustrate its robustness, the novel pCF-MM is applied to the vibration data of a balcony specimen to estimate its first vibration modes.
