In this paper, a new damage identification formulation is presented for damage identification of the specified fluid-structure system considering rigorous fluid-structure interaction and model updating method. The formulation is clearly proposed based on coupled asymmetric eigenvalue problem with the aid of incomplete modal data. In this formulation, nodal pressures of the fluid domain are not required to measure. Moreover, the fluid domain is presumed compressible, inviscid and irrotational. In order to demonstrate the accuracy and performance of the presented method, two completely and partially fluid-filled tanks with different cases of damages are analyzed. It is shown that the proposed strategy is capable of identifying the location and severity of damages with high accuracies.

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