Patent ID: 9500131
Filing Date: 2016-11-22
CPC Classification: B64D,F02C,F05D,Y02T

Claim Text:
1. A sound-absorbing arrangement for an engine nacelle, comprising: a first damping structure that comprises a sound-damping honeycomb structure between a perforated inner layer and an outer layer, wherein the first damping structure has a first section and a second section which are arranged behind each other in an axial direction, and a second damping structure that is formed in a ring-shaped manner and adjoining the second section of the first damping structure externally in a radial direction, wherein the second damping structure is formed by multiple hollow chambers adjacent to each other in a circumferential direction, wherein the hollow chambers are formed without an internal honeycomb structure, wherein at least one of the hollow chambers includes a hollow open interior with a first the at least one hollow chamber to fluidly couple the interior of the at least one hollow chamber to the first damping structure, the second side of the at least one hollow chamber being fluidly closed to the first damping structure except through the first side.