Component-mode synthesis method variants in the dynamics of coupled structures

The component-mode synthesis method is usually adopted in order to reduce t he number of degrees-of-freedom of structures composed of two or more subst ructures without loosing the main physical characteristics of the whole str ucture. Many approaches of this method have been proposed in the literature . These approaches differ from each other for the boundary conditions which are imposed at the interface of the two substructures. In this paper four variants of interface boundary conditions are examined. For each set of con ditions a suitable coordinate transformation, compatible with the condition s at the boundary degrees-of-freedom between the two substructures, is pres ented. Moreover, in the numerical applications a comparison between the fou r component-mode synthesis variants here proposed with respect to the same variants proposed in the literature is presented. The better accuracy of th e proposed approach is shown.