This doctoral thesis addresses the problem of flexible interface characterization for the needs of dynamic substructuring with experimental models. The reliability of the substructuring process is conditioned by the accuracy and consistency of the identified dynamic properties at the contact area. This aspect is problematic in the experimental evaluation due to the unavoidable errors of experimental modal analysis. As a result, it is not possible to establish appropriate constraint conditions between substructures, which is a crucial step in the substructuring process. In our research, the interface problem in experimental substructuring is addressed in different fields. The first part represents the process of obtaining experimental modal models, where a hybrid modal identification method is developed. The proposed identification approach addresses the problem of near-to-node sensor placement in experimental modal analysis. In the second part, different formulations of constraint conditions between substructures are considered. A new constraint weakening approach is proposed to generate and estimate the number of dominant independent constraints. The third part covers the topic of hybrid modeling with equivalent models. Based on the original interpretation of the established methods, a new expansion method is developed in the modal domain. The last part presents an application of the substructuring process with experimental models, obtained by non-contact response measurement methods.
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