Assembly of a foam high, and application that - latter has the soundproofing of closed spaces

摘要

The present invention relates to a set of insonorisation.elle relates to a set of acoustic insulation, comprising superposed layers in the form of a first group of layers (36) having a good resistance to the passage of air, and a second group (24) of layers with a mass - spring comprising a layer (28) having a function of a heavy mass of a viscoelastic and a layer (26) of the spring type; the first group of layers comprises a layer (36) of a foam with open cells of a high porosity, tortuosity high and good resistance to the passage of air, this layer (36) which, thanks to its high tortuosity, excellent properties of the acoustic absorption to the medium frequencies and hautes.application to the soundproofing of the passenger compartment of the motor.