The main provisions of the theory of sound matching of wave fields are considered, which makes it possible to investigate the mechanism of sound transmission through single-layer and multi-layer enclosing structures, taking into account the dual nature of sound transmission. Analytical expressions are given for determining the ultimate sound insulation of the fence, which can not be exceeded for a given mass and geometric dimensions. The reserves of increasing of the sound insulation of single-layer and multi-layered enclosing structures used in construction have been investigated.
$^1$Nizhny Novgorod State University of Architecture and Civil Engineering
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