Damage Detection Using Expanded Dynamic Residuals

Abstract

In this work, an algorithm for detecting the location of damage in a structure using a finite element model and pre- and post-damage measured modal properties is presented. In particular, an algorithm which addresses one aspect of the incomplete measurement problem, namely the measurement of mode shape information at fewer spatial degrees of freedom than that modeled in the finite element model, is presented. The performance of the algorithm is evaluated using the NASA 8-bay experimental test bed. The results indicate that the proposed approach holds great promise for identifying damage when structural instrumentation is limited. The same approach can also be used in model correlation efforts to aid in the selection of physical parameters to be estimated.