In the process of the structural integrity and launch-environment survivability assessment of satellite structures, dynamic mathematical models are used for load prediction. These analytical models need to be test-verified. Therefore it is of vital importance to correlate the Finite Element model with experimental vibration data and to further fine-tuned and update the model. In the classical modal parameter estimation approach, the baseline data are Frequency Response Functions measured in laboratory conditions with low-level excitation.
However, real operating conditions may differ significantly. The integration of the modal survey with the qualification shaker test combines the advantage of more realistic excitation level with productivity. This paper investigates the validity of modal analysis based on vibration control tests. This issue is complicated by the fact that during the qualification test often the load conditions are unknown.
Modal analysis can only be based on transmissibilities in this case. Also the structure can only be excited in one direction at a time. A test structure was subjected to different typical vibration qualification test. The results of modal analysis based on Vibration Control data are compared with operational modal analysis and traditional input-output modal analysis.
