We present in this paper a  simulation-based assessment of our recently-presented subspace-based monitoring and diagnostics algorithms. The study is based on a simple but realistic simulation of a rocked during flight with
known dynamics. The faults are represented by changes in the mass matrix, and stationary as well as non-stationary excitations are considered. A new idea for a reverted use of the test is introduced that could have applications in FE-model updating.

Keywords : structural identification, in operation health monitoring, subspace algorithms.