This paper presents a general method to investigate the vibroacoustic behavior of complex structures coupled to acoustic cavities at low frequencies. A finite element description is used for structural displacements and fluid pressure fields. The coupled forced system is expanded on the uncoupled structure and rigid cavity modal basis. The structural modal analysis is performed using a free-interface component mode synthesis technique. The method proves to be accurate and well suited to parameter studies on structural complexities. In this paper, the method is applied to investigate the sound transmission paths in buildings at low frequencies. In addition, a general elastic joint between the separating wall and the lateral walls is accounted for in the model. The original free-interface technique has been modified both in the definition of the attachment modes and in the assembly procedure to account for the mass-less joint which is considered as a substructure in the component mode synthesis. An example is presented to validate the approach. Additional applications will be detailed in the poster session.
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