Damping Identification Using a Robust FRF-Based Model Updating Technique (original) (raw)

Frequency Response Functions (FRFs) residues have been widely used in time to update Finite Element models. The main reasons for this are that FRFs are very sensitive to modal properties such as damping, local modes influence is included, and no modal analysis is strictly required. Nevertheless, it is well known that due to the nature of the FRFs, model updating strategies may suffer serious discontinuities in the topology of the objective function, causing the updating procedure to diverge or to find a local non-physical minimum. This paper addresses the situation by presenting a residue that avoids such numerical instabilities. In particular we concentrate on damping identification. A benchmark from a European group is used to assess the goodness of the method compared to other well known techniques.