초록 ▼

A multilayer acoustic treatment panel including 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. The perforated skin includes at least one pair of high-p

A multilayer acoustic treatment panel including 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. 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 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 the two ends of a soundwave flow channel arranged in the second cellular-structure core.

대표청구항 ▼

1. A multilayer acoustic treatment panel comprising: a first cellular-structure core sandwiched between a perforated skin and an intermediate skin; anda second cellular-structure core sandwiched between the intermediate skin and a continuous skin;wherein the perforated skin includes at least one pai

1. A multilayer acoustic treatment panel comprising: a first cellular-structure core sandwiched between a perforated skin and an intermediate skin; anda 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. 2. A panel according to claim 1, wherein the high-porosity zones of a given pair communicate with the soundwave flow channel via wells passing both through the first cellular-structure core and the intermediate skin. 3. A panel according to claim 1, wherein the high-porosity zones of a given pair communicate with the soundwave flow channel via wells passing through the first cellular-structure core and via a plurality of orifices formed through the intermediate skin. 4. A panel according to claim 1, wherein the high-porosity zones of a given pair communicate with the soundwave flow channel through passages formed between cavities of the first cellular-structure core and a plurality of orifices formed through the intermediate skin. 5. A panel according to claim 1, wherein the zones of the intermediate skin overlying the first cellular-structure core bounded by the soundwave flow channel. 6. A panel according to claim 1, wherein the soundwave flow channel is formed by a corridor that is defined laterally by walls of the second cellular-structure core. 7. A panel according to claim 1, wherein the soundwave flow channel is formed by an array of adjacent cavities of the second cellular-structure core that communicate with one another via porous walls. 8. A panel according to claim 1, wherein the perforated skin includes a plurality of pairs of high-porosity zones that are transversely spaced from one another. 9. A panel according to claim 8, wherein the inlet zones and the outlet zones are in alignment in directions that are substantially transverse relative to the panel. 10. A turbojet nacelle comprising at least one acoustic treatment panel according to claim 1 on an inside face thereof. 11. A nacelle according to claim 10, wherein the perforated skin of the acoustic treatment panel is in contact with a cold stream flow passage defined on an outside by the inside face of the nacelle. 12. A turbojet including at least one acoustic treatment panel according to claim 1 on an outside face thereof. 13. A turbojet according to claim 12, wherein the perforated skin of the acoustic treatment panel is in contact with a cold stream flow passage defined on an inside by the outside face of the turbojet.