Identifiability problems for substructural identification under free vibration

摘要

The identifiability of the substructure in free vibration is probed in this paper. It is shown the spectral analysis in frequency domain fails to achieve the identifiability of the substructure， neither the base nor top story. The parametric method can assure the identifiability of the base and top story， only if a certain condition is satisfied. And the option of the acceleration or velocity as the plant output will make a difference to the identifiability.