Variational-based reduced-order model in dynamic substructuring of coupled structures through a dissipative physical interface: Recent advances

Abstract : This paper deals with a variational-based reduced-order model in dynamic substructuring of two coupled structures through a physical dissipative flexible interface. We consider the linear elastodynamic of a dissipative structure composed of two main dissipative substructures perfectly connected through interfaces by a linking substructure. The linking substructure is flexible and is modeled in the context of the general linear viscoelasticity theory, yielding damping and stiffness operators depending on the frequency, while the two main dissipative substructures are modeled in the context of linear elasticity with an additional classical viscous damping modeling which is assumed to be independent of the frequency. We present an appropriate review that we carry out on the different methods used in dynamic substructuring. The method proposed consists in constructing a reduced-order model using the free-interface elastic modes of the two main substructures and, for the linking substructure, an appropriate elastostatic lifting operator and the frequency-dependent fixed-interface vector basis.