Substructure-decoupling techniques are used to identify a substructure as a standalone system while it is coupled to a complex structure (an assembly of substructures). These recently introduced ...techniques can be used for various applications, e.g., when modal testing methods are not appropriate due to the limits of the measurement equipment, when the substructure cannot be measured separately from the complex structure and for vibration-control techniques. The complex structure consists of the unknown substructure and the remaining structure. A drawback of the available substructure-decoupling techniques is that they require a model of the remaining substructure. However, when the model cannot be calculated or (experimentally) identified, the substructure-decoupling techniques cannot be used. In this paper a new approach is presented that does not require a model of the remaining substructure, but is based on an experimental identification of the interface forces. To research the application possibilities for real situations, complex structures with beam-like coupling elements are investigated. The article includes numerical and experimental test cases.
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