A method for substructure decoupling of mechanical systems by using frequency response functions

The need for modification in many mechanical systems occurs due to the parameters that are not taken into account during the design process and the changes made on the main structure. This can be in the form of removing a substructure from the main structure. Although the dynamic properties of the main structure are known, it is important to know what the dynamic properties of the new structure will be formed by the substructure removed from the main structure. In this study, a method for substructure decoupling of mechanical systems based on the Sherman–Morrison formula is presented. The frequency response functions (FRFs) of the main structure relating to the decoupling coordinates are directly used in the developed method. The main highlight of the presented method is needed neither a physical model nor a modal model, since FRFs are directly used. It is also more useful than methods using modal properties, since a limited number of FRFs are used for decoupling coordinates.