# US 9,752,595 B2 · Nacelle core with insert > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,752,595 B2 - Document ID: US9752595B2 - Status: Granted - Kind: B2 - Application number: 14/931,508 - Filed: 2015-11-03 - Published: 2017-05-04 - Granted: 2017-09-05 - Earliest claimed: 2015-11-03 - Assignees: Rohr, Inc. - Applicants: Rohr, Inc. - Inventors: Jose S. Alonso-Miralles; Charles M. Biset; Christian Soria - Web page: https://patentgrep.com/patent/US9752595B2 ## CPC - F04D 29/665: {by means of resonance chambers or interference} - F04D 29/522: {especially adapted for elastic fluid pumps} - B64D 2033/0206: {comprising noise reduction means, e.g. acoustic liners} - F05B 2250/283: Honeycomb - F05B 2260/96: Preventing, counteracting or reducing vibration or noise - F04D: NON-POSITIVE-DISPLACEMENT PUMPS (engine fuel-injection pumps F02M; ion pumps H01J41/12; electrodynamic pumps H02K44/02) - B64D: EQUIPMENT FOR FITTING IN OR TO AIRCRAFT; FLIGHT SUITS; PARACHUTES; ARRANGEMENT OR MOUNTING OF POWER PLANTS OR PROPULSION TRANSMISSIONS IN AIRCRAFT - F05B: INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G ## Abstract Aspects of the disclosure are directed to a structure comprising: a plurality of cells, a first non-permeable insert in a first cell of the plurality of cells, the first insert configured to constrict, by at least a first threshold amount, a flow of fluid in the first cell such that: acoustic power over a frequency range is attenuated by the structure by at least a second threshold amount, and a resonant frequency associated with the structure is shifted by at least a third threshold amount. ## Claims ### Claim 1 A structure comprising: a plurality of cells; a non-permeable first insert in a first cell of the plurality of cells, the first insert configured to constrict, by at least a first threshold amount, a flow of fluid in the first cell such that: acoustic power over a frequency range is attenuated by the structure by at least a second threshold amount, and a resonant frequency associated with the structure is shifted by at least a third threshold amount; wherein a surface of the first insert forms a hole that extends along an axis through the first insert, and a sectional geometry of the surface as viewed in a plane parallel to the axis is substantially round. ### Claim 2 (depends on 1) The structure of claim 1, wherein the first threshold amount is 90%. ### Claim 3 (depends on 1) The structure of claim 1, wherein the frequency range corresponds to 0-10 KHz. ### Claim 4 (depends on 1) The structure of claim 1, further comprising a non-permeable second insert, wherein the first insert is located at a first distance as measured from a bottom of the first cell, and wherein the second insert is located at a second distance as measured from the bottom of the first cell. ### Claim 5 (depends on 4) The structure of claim 4, wherein the first distance and the second distance are different. ### Claim 6 (depends on 1) The structure of claim 1, further comprising a non-permeable second insert, wherein the second insert is located in the first cell. ### Claim 7 (depends on 1) The structure of claim 1, further comprising a non-permeable second insert, wherein the second insert is located in a second cell of the plurality of cells. ### Claim 8 (depends on 1) The structure of claim 1, wherein each of the plurality of cells has a substantially hexagonal shape, and wherein the cells are arranged relative to one another to form a honeycomb profile. ### Claim 9 (depends on 8) The structure of claim 8, wherein outer edges of the first insert adhere to the shape of the first cell. ### Claim 10 (depends on 1) The structure of claim 1, wherein the frequency range and the second threshold amount are based on at least one of: a count of inserts within at least one of the cells, a location of the first insert within the first cell, a size of the first insert, a size of a hole defined by the first insert, a shape of the first insert, or a shape of the first cell. ### Claim 11 (depends on 1) The structure of claim 1, wherein the structure is configured to be incorporated in a nacelle of an aircraft. ### Claim 12 (depends on 11) The structure of claim 11, wherein the structure is configured to be incorporated in at least one of a translating sleeve or a blocker door. ### Claim 13 (depends on 11) The structure of claim 11, wherein at least one of the frequency range or the second threshold amount is based on a size of a fan housed within the nacelle. ### Claim 14 (depends on 1) The structure of claim 1, wherein the frequency range corresponds to 0-1 KHz. ### Claim 15 (depends on 1) The structure of claim 1, wherein the sectional geometry of the surface as viewed in the plane parallel to the axis is semi-circular. ### Claim 16 A structure comprising: a plurality of cells; a non-permeable first insert in a first cell of the plurality of cells, the first insert configured to constrict, by at least a first threshold amount, a flow of fluid in the first cell such that: acoustic power over a frequency range is attenuated by the structure b at least a second threshold amount, and a resonant frequency associated with the structure is shifted by at least a third threshold amount; a non-permeable second insert in a second cell of the plurality of cells; and a non-permeable third insert in the second cell of the plurality of cells; wherein the first insert is substantially located at a center of the first cell, the second insert is substantially located at a top of the second cell, and the third insert is substantially located at a bottom of the second cell. ### Claim 17 (depends on 16) The structure of claim 16, wherein the first insert is a first distance from a bottom of the first cell, the second insert is a second distance from the bottom of the second cell, the third insert is a third distance from the bottom of the second cell, and the first distance is less than the second distance and greater than the third distance. ### Claim 18 A structure, comprising: a plurality of cells comprising a first cell; and a non-permeable first insert arranged in the first cell, the first insert configured to constrict, by at least a first threshold amount, a flow of fluid in the first cell such that: acoustic power over a frequency range is attenuated by the structure by at least a second threshold amount, and a resonant frequency associated with the structure is shifted by at least a third threshold amount; wherein an aperture extends along a centerline through the first insert, the aperture is partially formed by an annular edge portion of the first insert, and the annular edge portion comprises a curved bevel. ### Claim 19 (depends on 18) The structure of claim 18, wherein the aperture is further partially formed by a second annular edge portion of the first insert, and the second annular edge portion comprises a curved bevel.