Sandwich beams and plates have been used for a long time for various applications, in building construction components, for transport vehicles, in skimaking and so forth. Typically there are two skins, often identical, and a core. The scientificliterature is extensive due to the fact that according to the actual application the models describing the skins and the core can be vastly different.The starting point for the present work was a need for improved calculation models for impact sound transmission in buildings. A floating floor construction can be classified as a sandwich, a plate on an elastic interlayer upon a massive floor. Theinterlayer, commonly a porous material, is normally characterised by the elastic properties only, i.e. neglecting the fluid wave motion in the material. Having developed a finite element programme, FEMAk [1] for handling acoustic problems whichincorporates elements describing a porous, flexible material by the Biot-theory, it was very tempting to apply these elements in a finite element description of a sandwich construction.
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