# US 8,464,831 B2 · Noise attenuation panel and a gas turbine component comprising a noise attenuation panel > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,464,831 B2 - Document ID: US8464831B2 - Status: Granted - Kind: B2 - Application number: 13/496,238 - Filed: 2009-09-17 - Published: 2012-07-05 - Granted: 2013-06-18 - Earliest claimed: 2009-09-17 - Assignees: Volvo Aero Corporation - Applicants: Marcus Olander Burak; Lars-Erik Eriksson - Inventors: Marcus Olander Burak; Lars-Erik Eriksson - Web page: https://patentgrep.com/patent/US8464831B2 ## CPC - F02C 7/045: having provisions for noise suppression - F01D 9/041: {using blades (F01D5/148 takes precedence)} - F01D 25/162: {Bearing supports} - F02K 1/827: {Sound absorbing structures or liners} - G10K 11/172: using resonance effects - F05D 2250/191: perforated - F05D 2250/283: honeycomb - F05D 2260/96: Preventing, counteracting or reducing vibration or noise - F05D 2260/963: by Helmholtz resonators - Y02T 50/60: Efficient propulsion technologies, e.g. for aircraft - F02C: GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS (construction of turbines F01D; jet-propulsion plants F02K; construction of compressors or fans F04; generating combustion products of high pressure or high velocity F23R; using gas turbines in compression refrigeration plants F25B11/00) - F01D: NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES (machines or engines for liquids F03; non-positive displacement pumps F04D) - F02K: JET-PROPULSION PLANTS (features of jet-propulsion plants common to gas-turbine plants, air intakes or fuel supply control of air-breathing jet-propulsion plants F02C7/00, F02C9/00) - G10K: SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR - F05D: INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## Abstract A noise attenuation panel includes a first wall, a second wall and partition walls connected to the first and second walls and defining cells between the first and second walls. The first wall is provided with a plurality of through holes. At least two of the cells are interconnected via a communication hole. One of the through holes leads to a first of the at least two interconnected cells and a second of the interconnected cells is configured to prevent any gas flow through the second cell. ## Claims ### Claim 1 A noise attenuation panel comprising a first wall, a second wall and partition walls connected to the first and second walls and defining cells between the first and second walls, wherein the first wall is provided with a plurality of through holes, wherein at least two of the cells are interconnected via a communication hole, one of the through holes leads to a first of the at least two interconnected cells, and that second of the interconnected cells is configured to prevent any gas flow through the second cell, and one of the communication holes to the first cell is provided at an opposite end of the partition wall in relation to the first wall. ### Claim 2 (depends on 1) A noise attenuation panel according to claim 1, wherein the partition walls form a honeycomb structure. ### Claim 3 (depends on 1) A noise attenuation panel according to claim 1, wherein at least three cells are interconnected via communication holes. ### Claim 4 (depends on 3) A noise attenuation panel according to claim 3, wherein the first cell forms an end cell in the at least three interconnected cells. ### Claim 5 (depends on 3) A noise attenuation panel according to claim 3, wherein at least three cells of the at least three interconnected cells are arranged along a straight line. ### Claim 6 (depends on 3) A noise attenuation panel according to claim 3, wherein only the first cell in the at least three interconnected cells is provided with a through hole in its associated part of the first wall. ### Claim 7 (depends on 2) A noise attenuation panel according to claim 2, wherein the partition walls define hexagonal cells. ### Claim 8 (depends on 1) A noise attenuation panel according to claim 1, wherein at least three cells are interconnected via communication holes and one of the communication holes is provided between the second cell and an intermediate cell between the first and second cells in the interconnected cells in the vicinity of the first wall. ### Claim 9 (depends on 1) A noise attenuation panel according to claim 1, wherein the through holes are isotropically distributed in the first wall. ### Claim 10 (depends on 1) A noise attenuation panel according to claim 1, wherein the second wall is continuous thereby forming a closed side of the cells. ### Claim 11 (depends on 1) A gas turbine engine component, wherein it comprises at least one noise attenuation panel according to claim 1 and that the noise attenuation panel is arranged so that a surface of the first wall opposite the cells faces a gas channel. ### Claim 12 (depends on 11) A gas turbine engine component according to claim 11, wherein the panel is arranged so that a surface of the second wall opposite the cells faces an external surface of a body of the component. ### Claim 13 A gas turbine engine component comprising at least one noise attenuation panel, the panel comprising a first wall and partition walls connected to the first wall and defining cells, wherein the first wall is provided with a plurality of through holes, wherein at least two of the cells are interconnected via a communication hole, one of the through holes leads to a first of the at least two interconnected cells, a second of the interconnected cells is configured to prevent any gas flow through the second cell, and one of the communication holes to the first cell is provided at an opposite end of the partition wall in relation to the first wall. ### Claim 14 (depends on 13) A gas turbine engine component according to claim 13, wherein the noise attenuation panel is arranged in a correspondingly shaped recess in a body of the component so that the opposite surface of the first wall is arranged flush with the adjacent gas turbine component surface. ### Claim 15 (depends on 13) A gas turbine engine component according to claim 13, wherein the noise attenuation panel is arranged at as guide blade. ### Claim 16 (depends on 13) A gas turbine engine component according to claim 13, wherein the noise attenuation panel is arranged at a cylindrical surface of a ring-shaped part defining the gas channel. ### Claim 17 A noise attenuation panel comprising a first wall, a second wall and partition walls connected to the first and second walls and defining cells between the first and second walls, wherein the first wall is provided with a plurality of through holes, wherein at least three of the cells are interconnected via a first communication hole in a first partition wall between a first two of the three interconnected cells and via a second communication hole in a second partition wall between a second two of the three interconnected cells, one of the through holes leads to a first of the at least three interconnected cells, a second of the interconnected cells is configured to prevent any gas flow through the second cell, and the first and second communication holes are provided at opposite ends of the first and second partition walls in relation to the first wall.