CONSISTENT-MODE INDICATOR FOR THE EIGENSYSTEM REALIZATION-ALGORITHM

A new method is described for assessing the consistency of structural modal parameters identified with the eigensystem realization algorithm . Identification results show varying consistency in practice due to m any sources including high modal density, nonlinearity, and inadequate excitation. Consistency is considered to be a reliable indicator of a ccuracy. The new method is the culmination of many years of experience in developing a practical implementation of the eigensystem realizati on algorithm. The effectiveness of the method is illustrated using dat a from NASA Langley's controls-structures-interaction evolutionary mod el.