Patent ID: 9546602
Date: 2017-01-17
CPC Classifications: B64D,F02C,F02K,F05D,G10K

Claim:
1. A multilayer acoustic treatment panel comprising: a first cellular-structure core sandwiched between a perforated skin and an intermediate skin; and a second cellular-structure core sandwiched between the intermediate skin and a continuous skin; wherein the perforated skin includes at least one pair of high-porosity zones presenting a perforation ratio greater than a perforation ratio of a remainder of the perforated skin and including an inlet zone and an outlet zone that are longitudinally spaced apart from each other, the high-porosity zones of a given pair communicating through the first cellular-structure core and the intermediate skin with two ends of a soundwave flow channel arranged in the second cellular structure core; wherein the intermediate skin is perforated except for zones overlying a portion of the first cellular-structure core bounded by the soundwave flow channel, the zones being continuous.