When a complex structural system must be analyzed for its response to dynamic excitation, some form of substructure coupling method, or component mode synthesis (CMS) method, is usually employed. It is generally necessary to perform some form of vibration test to validate the separate substructure math models, which are then coupled together for the system analysis. When such tests are performed, it is important to give special attention to the way that the substructure is supported and the way that it is excited. A new substructure system identification algorithm, which porduces a linear, viscous-damped, reduced-order physical model (i.e., M, C, and K), is described in this paper, and the results of numerical simulations used to test the proposed new algorithm are presented. Of particular interest is the comparison between the results obtained by using the ordinary least-squares (OLS) method and those based on the total least-squares (TLS) method.
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