Globally enriched substructuring techniques for vibro-acoustic simulation

The coupling between structures and internal and/or external acoustics in fluids is a common issue in many industrial design fields. Discretization of these kinds of problems results in a large number of equations which might sometimes impede a reasonable design time-line. Model reduction methods are used to efficiently reduce the system size and conduct analysis on the reduced problems. This research paper outlines some extensions of the standard Craig-Bampton method to strongly coupled vibroacoustic problems. Namely, the standard Craig-Bampton basis is enriched with the approximations of global mode representations, which are the outcomes of a new iterative solver that is being developed, namely Iterative Reduced Correction Algorithm, IRCA. An academic test example is considered to show the validity of the proposed substructuring schemes along with error comparisons on the frequency values.