Acoustic panel with sidewall stringers

{
  "publication_number": "US10309305B2",
  "country": "US",
  "kind": "B2",
  "title": "Acoustic panel with sidewall stringers",
  "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": [
    "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.",
    "2. 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.",
    "3. 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.",
    "4. 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.",
    "5. 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.",
    "6. 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.",
    "7. The panel of claim 6, wherein the first channel and the second channel are on opposing sides of the corrugated body.",
    "8. 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.",
    "9. 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.",
    "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.",
    "11. 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.",
    "12. The panel of claim 1, wherein the first sidewall is configured as a single wall structure.",
    "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.",
    "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.",
    "15. The panel of claim 1, wherein each of the stringer bodies is formed from sheet metal.",
    "16. The panel of claim 1, wherein the corrugated structure comprises composite material; and each of the stringer bodies comprises metal.",
    "17. The panel of claim 1, wherein each of the stringer bodies comprises polymer."
  ],
  "description_excerpt": "This disclosure relates generally to noise attenuation and, more particularly, to an acoustic panel (sometimes also referred to as “an acoustic liner” for attenuating noise generated by, for example, a gas turbine engine for an aircraft propulsion system.\n\nAcoustic panels may be used in various applications to attenuate noise. An acoustic panel, for example, may be configured with a nacelle of an aircraft propulsion system to attenuate noise generated by a gas turbine engine. Such an acoustic panel typically includes a honeycomb core connected between a perforated face skin and a solid, non-perforated back skin. The honeycomb core includes a plurality of resonating chambers. These resonating chambers are tuned by selecting a desired chamber length and, thus, core thickness that corresponds to a specific target frequency of noise to be attenuated. Increasing the core thickness, for example, will typically tune the resonating chambers for attenuating lower frequency noise. Conversely, decreasing the core thickness will typically tune the resonating chambers to attenuate higher frequency noise.\n\nRecent trends in aircraft engine design such as higher bypass ratios, larger fan diameters, slower rotating fans and/or fewer number of fan blades have resulted in those aircraft engines generating relatively low frequency noise. Relatively strict space constraints (e.g., loft envelope) for those engines, however, typically limit or prohibit increasing the thickness of an acoustic panel to tune its resonating chambers for such relatively low frequency noise.",
  "cpc": [
    "F02C 7/045",
    "F02K 1/827",
    "G10K 11/16",
    "G10K 11/168",
    "G10K 11/172"
  ],
  "ipc": [
    "F02C 7/045",
    "F02K 1/82",
    "G10K 11/168",
    "F02C 7/24",
    "G10K 11/16",
    "G10K 11/172"
  ],
  "assignees": [
    "Rohr Inc"
  ],
  "inventors": [
    "Charles Michael Biset",
    "Christian Soria"
  ],
  "filing_date": "2016-11-18",
  "publication_date": "2019-06-04",
  "grant_date": "2019-06-04",
  "priority_date": "2016-11-18",
  "application_number": "US-201615355975-A",
  "family_id": "60413089",
  "cited_by_count": 15,
  "citations": [
    "US2333343A",
    "US3341395A",
    "US3380206A",
    "US3734234A",
    "US3848697A",
    "GB1406844A",
    "US3831710A",
    "US3913702A",
    "US3963094A",
    "FR2396868A1",
    "US4231447A",
    "US4298090A",
    "US4333598A",
    "US4643933A",
    "US5487930A",
    "US5635306A",
    "RU2064691C1",
    "US6274216B1",
    "US7051489B1",
    "US20060112655A1",
    "US6725541B1",
    "US6536556B2",
    "US6544623B1",
    "US7661510B2",
    "US7824775B2",
    "US7784283B2",
    "US8628635B2",
    "US20110244150A1",
    "US9303588B2",
    "US9127452B1",
    "US9592918B2",
    "US9761216B2",
    "US9704467B1",
    "US20170301334A1"
  ]
}