8. Dispersion–Corrected, Operationally Normalized Stabilization Diagrams for Robust Structural Identification

This study aims at incorporating a certain degree of formalization to stabilization diagrams by integrating two additional features: the former introduces a new quantity, the modal dispersion metric, which expresses a certain part of the total stochastic vibration energy, and it is attributed to each vibration mode. The latter implements a polynomial chaos expansion framework for quantifying the effect of the operational conditions into the modal dispersion index. By combining these two features, a vibration mode is deemed as a structural one when it appears stabilized, i.e., comes with a high modal dispersion index and is operationally normalized. The proposed method is characterized by global applicability, thus also serving as a common measure of effectiveness among diverse parametric identification methods.