A new method for frequency response analysis of large finite element models of structures is presented. The method uses multi-level substructuring with a very large number of substructures to minimize computation. The process of partitioning the model into substructures is automated to minimize human input requirements. Similarly, substructure modes are selected by an automated adaptive procedure which constructs a model with a minimum number of degrees of freedom for satisfying a user-specified error tolerance. Procedures for performing very efficient analysis over a frequency window are presented, and some preliminary computational performance results are given.
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