# US 10,309,305 B2 · Acoustic panel with sidewall stringers > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,309,305 B2 - Document ID: US10309305B2 - Status: Granted - Kind: B2 - Application number: 15/355,975 - Filed: 2016-11-18 - Published: 2018-05-24 - Granted: 2019-06-04 - Earliest claimed: 2016-11-18 - Assignees: Rohr, Inc. - Applicants: Rohr, Inc. - Inventors: Charles Michael Biset; Christian Soria - Web page: https://patentgrep.com/patent/US10309305B2 ## CPC - F02C 7/045: having provisions for noise suppression - F02K 1/827: {Sound absorbing structures or liners} - G10K 11/16: Methods or devices for protecting against, or for damping, noise or other acoustic waves in general (G10K11/36 takes precedence) - G10K 11/168: Plural layers of different materials, e.g. sandwiches - G10K 11/172: using resonance effects - 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) - 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 ## Abstract A panel is provided for attenuating noise. This panel includes a porous first skin, a second skin and a core, which is connected between the porous first skin and the second skin. The core includes a corrugated body and a plurality of stringer bodies. The corrugated body includes a plurality of corrugations configured from at least a plurality of baffles and a plurality of porous septums. Each of the corrugations includes a respective one of the baffles and a respective one of the porous septums. A first of the corrugations forms a first channel that extends laterally between a first of the baffles and a first of the porous septums. The stringer bodies are spaced longitudinally along the first channel. Each of the stringer bodies includes a first sidewall disposed within the first channel and configured to fluidly isolate longitudinally adjacent portions of the first channel from one another. ## Claims ### Claim 1 A panel for attenuating noise, comprising: a porous first skin; a second skin; and a core connected between the porous first skin and the second skin, the core including a corrugated body and a plurality of stringer bodies; the corrugated body including a plurality of corrugations configured from at least a plurality of baffles and a plurality of porous septums, each of the corrugations including a respective one of the baffles and a respective one of the porous septums, wherein a first of the corrugations forms a first channel that extends laterally between a first of the baffles and a first of the porous septums; and the stringer bodies spaced longitudinally along the first channel, each of the stringer bodies comprising a first sidewall disposed within the first channel and configured to fluidly isolate longitudinally adjacent portions of the first channel from one another; wherein each of the stringer bodies further includes a tongue laterally connected to the first sidewall, and the tongue is mated with a respective groove in a peak formed by the first of the baffles and a second of the porous septums. ### Claim 2 (depends on 1) The panel of claim 1, wherein a second of the corrugations forms a second channel that extends laterally between a second of the baffles and a second of the porous septums; and each of the stringer bodies comprising a second sidewall disposed within the second channel and configured to fluidly isolate longitudinally adjacent portions of the second channel from one another. ### Claim 3 (depends on 1) The panel of claim 1, wherein each of the stringer bodies extends laterally across the first of the corrugations and a second of the corrugations. ### Claim 4 (depends on 1) The panel of claim 1, wherein the first sidewall of each of the stringer bodies extends from the porous first skin to the first of the baffles and the first of the porous septums. ### Claim 5 (depends on 1) The panel of claim 1, wherein the first sidewall of each of the stringer bodies extends from the second skin to the first of the baffles and the first of the porous septums. ### Claim 6 (depends on 1) The panel of claim 1, wherein a second channel extends laterally between the first of the porous septums and a second of the baffles; the core further includes a plurality of second stringer bodies; each of the second stringer bodies comprising a second sidewall disposed within the second channel and configured to fluidly isolate longitudinally adjacent portions of the second channel from one another. ### Claim 7 (depends on 6) The panel of claim 6, wherein the first channel and the second channel are on opposing sides of the corrugated body. ### Claim 8 (depends on 6) The panel of claim 6, wherein a cavity extends laterally between the first of the baffles and the second of the baffles and is fluidly coupled with perforations in the porous first skin; the first septum extending from the porous first skin and the first of the baffles to the second skin and the second of the baffles, and dividing the cavity into fluidly coupled first and second sub-cavities; the first sub-cavity extends longitudinally between the first sidewalls of an adjacent pair of the stringer bodies; and the second sub-cavity extends longitudinally between the second sidewalls of an adjacent pair of the second stringer bodies. ### Claim 9 (depends on 1) The panel of claim 1, wherein a second of the corrugations forms a second channel that extends laterally between a second of the baffles and the second of the porous septums; each of the stringer bodies comprising a second sidewall disposed within the second channel and configured to fluidly isolate longitudinally adjacent portions of the second channel from one another, and the tongue is configured as a bridge that extends laterally between and connects the first sidewall and the second sidewall. ### Claim 10 A panel for attenuating noise, comprising: a porous first skin; a second skin; and a core connected between the porous first skin and the second skin, the core including a corrugated body and a plurality of stringer bodies; the corrugated body including a plurality of corrugations configured from at least a plurality of baffles and a plurality of porous septums, each of the corrugations including a respective one of the baffles and a respective one of the porous septums, wherein a first of the corrugations forms a first channel that extends laterally between a first of the baffles and a first of the porous septums; and the stringer bodies spaced longitudinally along the first channel, each of the stringer bodies comprising a first sidewall disposed within the first channel and configured to fluidly isolate longitudinally adjacent portions of the first channel from one another; wherein a second of the corrugations forms a second channel that extends laterally between a second of the baffles and a second of the porous septums; wherein each of the stringer bodies comprising a second sidewall and a bridge; wherein the side sidewall is disposed within the second channel and configured to fluidly isolate longitudinally adjacent portions of the second channel from one another; and wherein the bridge extends laterally between and connects the first sidewall and the second sidewall. ### Claim 11 (depends on 10) The panel of claim 10, wherein the bridge lays over a peak formed by the first of the baffles and the second of the porous septums. ### Claim 12 (depends on 1) The panel of claim 1, wherein the first sidewall is configured as a single wall structure. ### Claim 13 A panel for attenuating noise, comprising: a porous first skin; a second skin; and a core connected between the porous first skin and the second skin, the core including a corrugated body and a plurality of stringer bodies; the corrugated body including a plurality of corrugations configured from at least a plurality of baffles and a plurality of porous septums, each of the corrugations including a respective one of the baffles and a respective one of the porous septums, wherein a first of the corrugations forms a first channel that extends laterally between a first of the baffles and a first of the porous septums; and the stringer bodies spaced longitudinally along the first channel, each of the stringer bodies comprising a first sidewall disposed within the first channel and configured to fluidly isolate longitudinally adjacent portions of the first channel from one another; wherein the first sidewall is configured as a multi-wall structure. ### Claim 14 A panel for attenuating noise, comprising: a porous first skin; a second skin; and a core connected between the porous first skin and the second skin, the core including a corrugated body and a plurality of stringer bodies; the corrugated body including a plurality of corrugations configured from at least a plurality of baffles and a plurality of porous septums, each of the corrugations including a respective one of the baffles and a respective one of the porous septums, wherein a first of the corrugations forms a first channel that extends laterally between a first of the baffles and a first of the porous septums; and the stringer bodies spaced longitudinally along the first channel, each of the stringer bodies comprising a first sidewall disposed within the first channel and configured to fluidly isolate longitudinally adjacent portions of the first channel from one another; wherein each of the stringer bodies further includes a tab that projects out from the first sidewall and is attached to the corrugated body. ### Claim 15 (depends on 1) The panel of claim 1, wherein each of the stringer bodies is formed from sheet metal. ### Claim 16 (depends on 1) The panel of claim 1, wherein the corrugated structure comprises composite material; and each of the stringer bodies comprises metal. ### Claim 17 (depends on 1) The panel of claim 1, wherein each of the stringer bodies comprises polymer.