VARIABLE HEIGHT SOUND-ABSORBING STRUCTURE Russian patent published in 2020 - IPC B32B3/12 

FIELD: construction.

SUBSTANCE: invention relates to sound-absorbing panels with resonant-type cells intended for use in aerospace engineering, transport equipment, radio engineering and construction. Different-height sound-absorbing structure comprises external panels, one of which is perforated, and cellular filler with different height of cells. Cells of the filler are divided into groups having a periodic structure. Each group includes a central cell and cells spirally around it with different heights. At that, the cell with the largest or smallest volume is received as the central cell, and at the central cell with the largest volume around it there are cells with reduced volumes, and at central cell with minimum volume there are cells with increased volumes. Neighbouring cells have different shapes and/or volumes.

EFFECT: technical result is higher efficiency of noise reduction.

6 cl, 5 dwg