Soundproofing panel with beads, and a method of manufacture

摘要

A soundproofing panel ( 2 ) comprises a core ( 4 ) sandwiched between a solid wall ( 6 ) and a porous wall ( 8 ), the core being connected to the walls and comprising partitions ( 12 ) extending in the thickness direction between the two walls so as to form cells ( 10 ) each cell containing at least one sound energy dissipating layer ( 14 ), the dissipating layers ( 14 ) being constituted by hollow spherical beads ( 20 ) having mutually contacting walls that are porous and micro-perforated, and being held in position in the thickness direction between the two walls ( 6, 8 ) by nets ( 22 ) that are secured to the partitions.