Abstract
Sound insulation at low frequencies is known to be difficult to measure accurately and to produce poor reproducibility. The use of numerical or analytical methods with the help of powerful computers allows us to understand the phenomenon of sound transmission at such frequencies. In this review, the sound insulation of party walls are shown to be strongly dependant on the acoustical modal characteristics of the connected rooms and of the structural modal characteristics of the party wall. Equal room configurations give a poorer sound insulation, compared with unequal room configuration. The sound insulation is strongly dependant on room dimensions, as well as size, type and edge conditions of the party wall.
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