WO2019070156A1 - Method for fabricating a blank of an acoustic structure - Google Patents
Method for fabricating a blank of an acoustic structure Download PDFInfo
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- WO2019070156A1 WO2019070156A1 PCT/RU2018/000640 RU2018000640W WO2019070156A1 WO 2019070156 A1 WO2019070156 A1 WO 2019070156A1 RU 2018000640 W RU2018000640 W RU 2018000640W WO 2019070156 A1 WO2019070156 A1 WO 2019070156A1
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- Prior art keywords
- walls
- membrane
- cells
- elastic material
- caps
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
- B32B3/10—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a discontinuous layer, i.e. formed of separate pieces of material
- B32B3/12—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a discontinuous layer, i.e. formed of separate pieces of material characterised by a layer of regularly- arranged cells, e.g. a honeycomb structure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C7/00—Features, components parts, details or accessories, not provided for in, or of interest apart form groups F02C1/00 - F02C6/00; Air intakes for jet-propulsion plants
- F02C7/04—Air intakes for gas-turbine plants or jet-propulsion plants
- F02C7/045—Air intakes for gas-turbine plants or jet-propulsion plants having provisions for noise suppression
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C7/00—Features, components parts, details or accessories, not provided for in, or of interest apart form groups F02C1/00 - F02C6/00; Air intakes for jet-propulsion plants
- F02C7/24—Heat or noise insulation
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- 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
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- 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
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/172—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using resonance effects
Definitions
- the present invention relates to acoustic systems, and can be used to fill the sound-absorbing structure of an aircraft engine nacelle used to reduce acoustic noise.
- a honeycomb element comprising a first and a second edge, wherein said honeycomb element further comprises a row of walls located between said first and second edges, and the walls define a row of cells in which indicated
- the cell has a cross-sectional area perpendicular to said walls and a depth limited by the distance between said first and second edges; membrane covers are formed by a sheet of elastic material having a thickness and an outer border, wherein said sheet
- the 25 of elastic material is sufficiently elastic so that it can be rolled up and inserted into the said cells with the formation of the mentioned membrane caps containing a resonator part, which runs transversely relative to the said cells and has an outer edge located at the said walls, and a flange part extending from parallel to the said walls and containing a stopping surface that is in frictional contact with said walls, wherein said stopping surface has a width, wherein she ins locking surface and the ability of the elastic material to restore its original shape enough to provide friction clutch membrane covers with cell walls, place membrane covers in cells so that membrane covers are fixed in place only by friction clutch membrane covers with walls, before performing membrane covers from a sheet of elastic material, the said sheet of elastic material is processed, and the flange part mentioned membrane caps are subjected to perforations (Patent RU 2606454, IPC: G10K11 / 172, publ. 10.01.2017).
- the disadvantage of this method is the possibility of displacement and loss of the patterns of membrane covers from the cells of the honeycomb element to the stage of applying adhesive due to insufficient frictional closure of the patterns of membrane covers with the walls of the cells of the honeycomb element.
- the consequence of which is the presentation of high requirements for the stability of the geometry of the honeycomb core.
- the technical objective of the claimed invention is to increase the effectiveness of reducing acoustic noise and reducing the number of scrap in the blanks of the acoustic structure.
- a workpiece acoustic structure which provides a honeycomb element containing the first and second edges
- the specified honeycomb element further comprises a number of walls located between the specified first and second edges, with Thereby, said walls limit a series of cells, in which each indicated cell has a cross-sectional area located perpendicular to said walls, and depths y, limited by the distance between said first and second edges, membrane covers are formed, formed by a sheet of elastic material having a thickness and an outer border, wherein said sheet of elastic material is sufficiently elastic so that it can be rolled up and 5 to insert into the said cells with the formation of the mentioned membrane caps containing a resonator part that extends transversely relative to the said cells and has an outer edge located at said walls and a flange part extending parallel to the said walls and containing a stopping surface located in frictional contact with these walls, with the specified locking surface has a width, with the width of the locking
- the flange part of the mentioned membrane caps is subjected to perforation, characterized in that the processing of a sheet of elastic material is carried out by passing through a calender, and before placing the membrane caps, incisions are made in the flange portion of the diaphragm cap patterns to the outer edge of the resonator portion.
- the number of cuts in the flange part of the pattern of membrane covers is 3 or 6. Passing a sheet of elastic material through a calender can increase the effectiveness of reducing acoustic noise, adjust the amount of acoustic resistance of membrane covers, and reduce acoustic noise.
- the length of the incisions and the zoo direction are adjusted for each of the cells according to an algorithm that ensures optimal intersection of the patterns of the membrane caps in the corners of the cells of the honeycomb element without wrinkling the material.
- a single set of essential features with common known provides a solution to the problem with the achievement of technical result and characterizes the proposed technical solution significant differences compared with the prior art and allows to increase the effectiveness of reducing acoustic noise and reduce the number of defects in the blanks of the acoustic structure.
- FIG. 15 in FIG. 1 is a cross-sectional view of an exemplary blank of a sound-absorbing structure, in which a set of membrane caps is located inside the cells of a honeycomb element;
- FIG. 2 shows a cross-sectional view of an exemplary membrane cap
- FIG. 3 20 in FIG. 3 is a perspective view of exemplary diaphragm cap patterns.
- a method of manufacturing a billet acoustic structure is as follows, in the manufacture of the billet acoustic structure 1, perform the steps that provide honeycomb element 2, which
- Cellular element 2 further comprises a row of walls 5 located between two edges 3 and 4 to form a row of cells 6.
- Each of the cells 6 has a cross-sectional area located perpendicular to the cell walls, and the depth bounded by the distance z0 between the first and second edges.
- the advantage of this procedure is that calendering allows you to adjust the amount of acoustic resistance of the membrane covers 7.
- the membrane covers 7 are formed from a sheet of elastic acoustic material by folding the patterns of the membrane covers 8.
- the patterns of the membrane covers 8 include the resonator part 9, which runs in the transverse plane section relative to the cells 6 of the honeycomb element 2 and has an outer edge 10 located at the walls 5, and a flange portion 11, extending parallel to the walls 5 and containing the locking surface 12, which is in frictional contact with the walls 5.
- Making patterns of membrane caps 8 is provided by cutting a sheet of elastic acoustic material.
- the flange part 11 of the membrane cover patterns 8 is perforated and notched to the outer edge of the resonator part 10.
- Pre-perforation of the patterns before bending in the form of a membrane provides channels into which glue can penetrate to enhance the connection of the membrane covers 7 and the cell element 2. Cut to the outer edge of the resonator part 10 provides a reduction in the number of scrap in the blanks of the acoustic structure, due to more dense junction of the membrane roof patterns 8 to the walls 5 of the honeycomb element 2 in the process of their placement in the cells 6.
- the step of folding and inserting into the cells 6 of the honeycomb element 2 of the patterns of the membrane covers 8 is performed together using the punch so that the membrane covers 7 are fixed in place only by means of friction clutch locking the surface 12 with the walls 5 of the honeycomb element 2.
- the frictional adhesion is ensured by the size of the locking surface, the ability of the elastic material to restore its original shape, and the absence in the corners of the cells 6 with element 2 folds of the material of the membrane caps 7.
- the stage of applying the binder on The mounting surface of the membrane covers 7 is performed by any procedure for applying an adhesive substance with the condition of selective application in such a way that only the flange parts of the 11 membrane covers 7 are involved.
- the invention used for the engine nacelle of an aircraft engine improves the efficiency of reducing acoustic noise and reduces the number of scrap in the blanks of the acoustic structure.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
Abstract
Description
Способ изготовления заготовки акустической структуры A method of manufacturing a billet acoustic structure
Настоящее изобретение относится к акустическим системам, и может быть использовано для заполнения звукопоглощающей конструкции мотогондолы авиационных двигателей, применяемой для снижения ю акустических шумов. The present invention relates to acoustic systems, and can be used to fill the sound-absorbing structure of an aircraft engine nacelle used to reduce acoustic noise.
В области авиационного двигателестроения существует проблема, связанная с необходимостью создания акустической структуры с широкими характеристиками звукопоглощения. In the field of aircraft engine building there is a problem associated with the need to create an acoustic structure with broad sound absorption characteristics.
Наиболее близким к заявляемому способу изготовления акустической Closest to the claimed method of manufacturing acoustic
15 структуры является способ изготовления заготовки акустической структуры, в котором обеспечивают сотовый элемент, содержащий первую и вторую кромку, при этом указанный сотовый элемент дополнительно содержит ряд стенок, расположенных между указанными первой й второй кромками, при этом указанные стенки ограничивают ряд ячеек, в котором каждая указанная15 of the structure is a method for producing a preform of an acoustic structure in which a honeycomb element is provided comprising a first and a second edge, wherein said honeycomb element further comprises a row of walls located between said first and second edges, and the walls define a row of cells in which indicated
20 ячейка имеет площадь поперечного сечения, расположенную перпендикулярно к указанным стенкам, и глубину, ограниченную расстоянием между указанной первой и второй кромками, выполняют мембранные крышки, образованные листом эластичного материала, имеющего толщину и внешнюю границу, при этом указанный лист20, the cell has a cross-sectional area perpendicular to said walls and a depth limited by the distance between said first and second edges; membrane covers are formed by a sheet of elastic material having a thickness and an outer border, wherein said sheet
25 эластичного материала является достаточно упругим для того, чтобы его можно было свернуть и вставить в упомянутые ячейки с образованием упомянутых мембранных крышек, содержащих резонаторную часть, которая проходит поперечно относительно упомянутых ячеек и имеет внешний край, расположенный у упомянутых стенок, и фланцевую часть, проходящую зо параллельно упомянутым стенкам и содержащую стопорную поверхность, находящуюся во фрикционном контакте с указанными стенками, при этом указанная стопорная поверхность имеет ширину, при этом ширины стопорной поверхности и способности эластичного материала восстанавливать первоначальную форму достаточно для обеспечения фрикционного сцепления мембранных крышек со стенками ячеек, размещают мембранные крышки в ячейках таким образом, чтобы мембранные крышки зафиксировались на месте только посредством фрикционного сцепления мембранных крышек со стенками, перед выполнением мембранных крышек из листа эластичного материала, проводят обработку указанного листа эластичного материала, а фланцевую часть упомянутых мембранных крышек подвергают перфорации (Патент RU 2606454, МПК: G10K11/172, опубл. 10.01.2017). 25 of elastic material is sufficiently elastic so that it can be rolled up and inserted into the said cells with the formation of the mentioned membrane caps containing a resonator part, which runs transversely relative to the said cells and has an outer edge located at the said walls, and a flange part extending from parallel to the said walls and containing a stopping surface that is in frictional contact with said walls, wherein said stopping surface has a width, wherein she ins locking surface and the ability of the elastic material to restore its original shape enough to provide friction clutch membrane covers with cell walls, place membrane covers in cells so that membrane covers are fixed in place only by friction clutch membrane covers with walls, before performing membrane covers from a sheet of elastic material, the said sheet of elastic material is processed, and the flange part mentioned membrane caps are subjected to perforations (Patent RU 2606454, IPC: G10K11 / 172, publ. 10.01.2017).
Недостатком этого способа является возможность смещения и выпадения выкроек мембранных крышек из ячеек сотового элемента до этапа нанесения клеящего вещества ввиду недостаточного фрикционного замыкания выкроек мембранных крышек со стенками ячеек сотового элемента. Следствием чего является предъявление высоких требований к стабильности геометрии сотового заполнителя. The disadvantage of this method is the possibility of displacement and loss of the patterns of membrane covers from the cells of the honeycomb element to the stage of applying adhesive due to insufficient frictional closure of the patterns of membrane covers with the walls of the cells of the honeycomb element. The consequence of which is the presentation of high requirements for the stability of the geometry of the honeycomb core.
Технической задачей заявляемого изобретения является повышение эффективности снижения акустического шума и уменьшение количества брака в заготовках акустической структуры. The technical objective of the claimed invention is to increase the effectiveness of reducing acoustic noise and reducing the number of scrap in the blanks of the acoustic structure.
Поставленная задача с достижением технического результата заявленного изобретения решается тем, что в способе изготовления заготовки акустической структуры, в котором обеспечивают сотовый элемент, содержащий первую и вторую кромку, при этом указанный сотовый элемент дополнительно содержит ряд стенок, расположенных между указанными первой и второй кромками, при этом указанные стенки ограничивают ряд ячеек, в котором каждая указанная ячейка имеет площадь поперечного сечения, расположенную перпендикулярно к указанным стенкам, и глубину, ограниченную расстоянием между указанной первой и второй кромками, выполняют мембранные крышки, образованные листом эластичного материала, имеющего толщину и внешнюю границу, при этом указанный лист эластичного материала является достаточно упругим для того, чтобы его можно было свернуть и 5 вставить в упомянутые ячейки с образованием упомянутых мембранных крышек, содержащих резонаторную часть, которая проходит поперечно относительно упомянутых ячеек и имеет внешний край, расположенный у упомянутых стенок, и фланцевую часть, проходящую параллельно упомянутым стенкам и содержащую стопорную поверхность, ю находящуюся во фрикционном контакте с указанными стенками, при этом указанная стопорная поверхность имеет ширину, при этом ширины стопорной поверхности и способности эластичного материала восстанавливать первоначальную форму достаточно для обеспечения фрикционного сцепления мембранных крышек со стенками ячеек,The task with the achievement of the technical result of the claimed invention is solved by the fact that in the method of manufacturing a workpiece acoustic structure, which provides a honeycomb element containing the first and second edges, with the specified honeycomb element further comprises a number of walls located between the specified first and second edges, with Thereby, said walls limit a series of cells, in which each indicated cell has a cross-sectional area located perpendicular to said walls, and depths y, limited by the distance between said first and second edges, membrane covers are formed, formed by a sheet of elastic material having a thickness and an outer border, wherein said sheet of elastic material is sufficiently elastic so that it can be rolled up and 5 to insert into the said cells with the formation of the mentioned membrane caps containing a resonator part that extends transversely relative to the said cells and has an outer edge located at said walls and a flange part extending parallel to the said walls and containing a stopping surface located in frictional contact with these walls, with the specified locking surface has a width, with the width of the locking surface and the ability of an elastic material to restore the original This shape is sufficient to ensure frictional adhesion of membrane caps with cell walls,
15 размещают мембранные крышки в ячейках таким образом, чтобы мембранные крышки зафиксировались на месте только посредством фрикционного сцепления мембранных крышек со стенками, перед выполнением мембранных крышек из листа эластичного материала, проводят обработку указанного листа эластичного материала, а15 place the membrane covers in the cells so that the membrane covers are locked in place only by frictional adhesion of the membrane covers to the walls, before the membrane covers are made of an elastic material sheet, the said elastic material is processed, and
20 фланцевую часть упомянутых мембранных крышек подвергают перфорации, отличающийся тем, что обработку листа эластичного материала осуществляют путем пропускания через каландр, а перед размещением мембранных крышек выполняют надрезы фланцевой части выкроек мембранных крышек до внешнего края резонаторной части. 20, the flange part of the mentioned membrane caps is subjected to perforation, characterized in that the processing of a sheet of elastic material is carried out by passing through a calender, and before placing the membrane caps, incisions are made in the flange portion of the diaphragm cap patterns to the outer edge of the resonator portion.
25 Кроме того, количество надрезов фланцевой части выкройки мембранных крышек равно 3 или 6. Пропускание листа эластичного материала через каландр позволяет повысить эффективность снижения акустического шума, регулировать величину акустического сопротивления мембранных крышек, снизить акустический шум. Длина надрезов и зо направление регулируется для каждой из ячеек по алгоритму, обеспечивающему оптимальное примыкание выкроек мембранных крышек в углах ячеек сотового элемента без образования складок материала. Это дает уменьшение требований к точности изготовления сотового элемента, и позволяет обеспечить уменьшение количества брака в заготовках 5 акустической структуры за счет более плотного примыкания выкроек мембранных крышек к стенкам сотового элемента в процессе их размещения в ячейках сотового элемента. 25 In addition, the number of cuts in the flange part of the pattern of membrane covers is 3 or 6. Passing a sheet of elastic material through a calender can increase the effectiveness of reducing acoustic noise, adjust the amount of acoustic resistance of membrane covers, and reduce acoustic noise. The length of the incisions and the zoo direction are adjusted for each of the cells according to an algorithm that ensures optimal intersection of the patterns of the membrane caps in the corners of the cells of the honeycomb element without wrinkling the material. This gives a reduction in the requirements for the accuracy of manufacture of the honeycomb element, and allows for a reduction in the number of scrap in the blanks 5 acoustic structure due to the more dense junction of the patterns of membrane covers to the walls of the honeycomb element in the process of their placement in the cells of the honeycomb element.
Единая совокупность новых существенных признаков с общими известными обеспечивает решение поставленной задачи с достижением ю технического результата и характеризует предложенное техническое решение существенными отличиями по сравнению с известным уровнем техники и позволяет повысить эффективность снижения акустического шума и уменьшить количество брака в заготовках акустической структуры. A single set of essential features with common known provides a solution to the problem with the achievement of technical result and characterizes the proposed technical solution significant differences compared with the prior art and allows to increase the effectiveness of reducing acoustic noise and reduce the number of defects in the blanks of the acoustic structure.
Сущность изобретения поясняется чертежами, где: The invention is illustrated by drawings, where:
15 на фиг.1 изображён вид поперечного сечения примерной заготовки звукопоглощающей конструкции, в которой набор мембранных крышек расположен внутри ячеек сотового элемента; 15 in FIG. 1 is a cross-sectional view of an exemplary blank of a sound-absorbing structure, in which a set of membrane caps is located inside the cells of a honeycomb element;
на фиг. 2 показан вид поперечного сечения примерной мембранной крышки; in fig. 2 shows a cross-sectional view of an exemplary membrane cap;
20 на фиг.З представлен вид в перспективе примерных выкроек мембранных крышек. 20 in FIG. 3 is a perspective view of exemplary diaphragm cap patterns.
Способ изготовления заготовки акустической структуры осуществляется следующим образом, при изготовлении заготовки акустической структуры 1, выполняют этапы, на которых обеспечивают сотовый элемент 2, который A method of manufacturing a billet acoustic structure is as follows, in the manufacture of the billet acoustic structure 1, perform the steps that provide honeycomb element 2, which
25 содержит первую кромку 3, размещенную ближе всего к источнику шума, и вторую кромку 4. Сотовый элемент 2 дополнительно содержит ряд стенок 5, расположенных между двумя кромками 3 и 4 с образованием ряда ячеек 6. Каждая из ячеек 6 имеет площадь поперечного сечения, расположенную перпендикулярно к стенкам ячейки, и глубину, ограниченную расстоянием зо между первой и второй кромками. Обеспечивают выполнение мембранных крышек 7 из листа эластичного акустического материала для последующего расположения внутри ячеек 6 сотового элемента 2. В качестве признака настоящего способа изготовления заготовки акустической структуры обеспечивают обработку листа эластичного акустического материала, пропусканием через, по меньшей мере, два валка каландра посредством чего осуществляется каландрирование. Преимущество этой процедуры заключается в том, что каландрирование позволяет регулировать величину акустического сопротивления мембранных крышек 7. Мембранные крышки 7, сформированы из листа эластичного акустического материала сворачиванием выкроек мембранных крышек 8. Выкройки мембранных крышек 8 включают в себя резонаторную часть 9, которая проходит в плоскости поперечного сечения относительно ячеек 6 сотового элемента 2 и имеет внешний край 10, расположенный у стенок 5, и фланцевую часть 11, проходящую параллельно стенкам 5 и содержащую стопорную поверхность 12, находящуюся во фрикционном контакте со стенками 5. Выполнение выкроек мембранных крышек 8 обеспечивается резкой листа эластичного акустического материала. Предварительно размещению и фиксации в ячейках 6 фланцевую часть 11 выкроек мембранных крышек 8 подвергают перфорации и надрезают до внешнего края резонаторной части 10. Предварительная перфорация выкроек перед изгибанием в форме мембраны обеспечивает каналы, в которые может проникнуть клей для усиления связи мембранных крышек 7 и ячейки сотового элемента 2. Надрез до внешнего края резонаторной части 10 обеспечивает уменьшение количества брака в заготовках акустической структуры, за счет более плотного примыкания выкроек мембранных крышек 8 к стенкам 5 сотового элемента 2 в процессе их размещения в ячейках 6. Этап сворачивания и вставки в ячейки 6 сотового элемента 2 выкроек мембранных крышек 8 выполняют вместе с использованием пуансона таким образом, чтобы мембранные крышки 7 зафиксировались на месте только посредством фрикционного сцепления стопорной поверхности 12 со стенками 5 сотового элемента 2. Фрикционное сцепление обеспечивается размером стопорной поверхности, способностью эластичного материала восстанавливать первоначальную форму, и отсутствием в углах ячеек 6 сотового элемента 2 складок материала мембранных крышек 7. Этап нанесения связующего вещества на поверхность крепления мембранных крышек 7 выполняют любой процедурой нанесения клеящего вещества с условием выборочного нанесения таким образом, чтобы задействованы были только фланцевые части 11 мембранных крышек 7. 25 comprises a first edge 3, located closest to the noise source, and a second edge 4. Cellular element 2 further comprises a row of walls 5 located between two edges 3 and 4 to form a row of cells 6. Each of the cells 6 has a cross-sectional area located perpendicular to the cell walls, and the depth bounded by the distance z0 between the first and second edges. Ensure the implementation of membrane covers 7 from a sheet of elastic acoustic material for the subsequent location inside the cells 6 of the honeycomb element 2. As a sign of the present method of manufacturing a preform of the acoustic structure, the sheet of elastic acoustic material is processed, passing through at least two rolls of a calender whereby calendering is carried out. The advantage of this procedure is that calendering allows you to adjust the amount of acoustic resistance of the membrane covers 7. The membrane covers 7 are formed from a sheet of elastic acoustic material by folding the patterns of the membrane covers 8. The patterns of the membrane covers 8 include the resonator part 9, which runs in the transverse plane section relative to the cells 6 of the honeycomb element 2 and has an outer edge 10 located at the walls 5, and a flange portion 11, extending parallel to the walls 5 and containing the locking surface 12, which is in frictional contact with the walls 5. Making patterns of membrane caps 8 is provided by cutting a sheet of elastic acoustic material. Pre-placement and fixation in the cells 6, the flange part 11 of the membrane cover patterns 8 is perforated and notched to the outer edge of the resonator part 10. Pre-perforation of the patterns before bending in the form of a membrane provides channels into which glue can penetrate to enhance the connection of the membrane covers 7 and the cell element 2. Cut to the outer edge of the resonator part 10 provides a reduction in the number of scrap in the blanks of the acoustic structure, due to more dense junction of the membrane roof patterns 8 to the walls 5 of the honeycomb element 2 in the process of their placement in the cells 6. The step of folding and inserting into the cells 6 of the honeycomb element 2 of the patterns of the membrane covers 8 is performed together using the punch so that the membrane covers 7 are fixed in place only by means of friction clutch locking the surface 12 with the walls 5 of the honeycomb element 2. The frictional adhesion is ensured by the size of the locking surface, the ability of the elastic material to restore its original shape, and the absence in the corners of the cells 6 with element 2 folds of the material of the membrane caps 7. The stage of applying the binder on The mounting surface of the membrane covers 7 is performed by any procedure for applying an adhesive substance with the condition of selective application in such a way that only the flange parts of the 11 membrane covers 7 are involved.
Таким образом, предлагаемое изобретение, используемое для мотогондолы авиационного двигателя, позволяет повысить эффективность снижения акустических шумов и уменьшить количество брака в заготовках акустической структуры. Thus, the invention used for the engine nacelle of an aircraft engine improves the efficiency of reducing acoustic noise and reduces the number of scrap in the blanks of the acoustic structure.
Claims
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| RU2017135487 | 2017-10-05 | ||
| RU2017135487A RU2699298C2 (en) | 2017-10-05 | 2017-10-05 | Method for manufacturing acoustic structure blank |
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| WO2019070156A1 true WO2019070156A1 (en) | 2019-04-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| PCT/RU2018/000640 Ceased WO2019070156A1 (en) | 2017-10-05 | 2018-10-03 | Method for fabricating a blank of an acoustic structure |
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| RU (1) | RU2699298C2 (en) |
| WO (1) | WO2019070156A1 (en) |
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| RU2747346C1 (en) * | 2020-07-13 | 2021-05-04 | Акционерное общество «ОДК-Авиадвигатель» | Automated method for producing a cellular filler with membrane covers |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2472509A1 (en) * | 2007-03-22 | 2012-07-04 | Hexcel Corporation | Septum cap for acoustic honeycomb |
| RU2492046C2 (en) * | 2009-04-28 | 2013-09-10 | Эйрбас Оператионс Гмбх | Method of making component of fibrous composite for aircraft and space engineering |
| WO2016182693A1 (en) * | 2015-05-11 | 2016-11-17 | Hexcel Corporation | Acoustic structures with multiple degrees of freedom |
| RU2606454C2 (en) * | 2011-10-24 | 2017-01-10 | Хексел Корпорейшн | Acoustic cellular system with perforated membrane caps |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4265955A (en) * | 1978-05-01 | 1981-05-05 | The Boeing Company | Honeycomb core with internal septum and method of making same |
| US5997985A (en) * | 1998-09-10 | 1999-12-07 | Northrop Grumman Corporation | Method of forming acoustic attenuation chambers using laser processing of multi-layered polymer films |
-
2017
- 2017-10-05 RU RU2017135487A patent/RU2699298C2/en active
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2018
- 2018-10-03 WO PCT/RU2018/000640 patent/WO2019070156A1/en not_active Ceased
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2472509A1 (en) * | 2007-03-22 | 2012-07-04 | Hexcel Corporation | Septum cap for acoustic honeycomb |
| RU2492046C2 (en) * | 2009-04-28 | 2013-09-10 | Эйрбас Оператионс Гмбх | Method of making component of fibrous composite for aircraft and space engineering |
| RU2606454C2 (en) * | 2011-10-24 | 2017-01-10 | Хексел Корпорейшн | Acoustic cellular system with perforated membrane caps |
| WO2016182693A1 (en) * | 2015-05-11 | 2016-11-17 | Hexcel Corporation | Acoustic structures with multiple degrees of freedom |
Also Published As
| Publication number | Publication date |
|---|---|
| RU2017135487A3 (en) | 2019-04-08 |
| RU2699298C2 (en) | 2019-09-04 |
| RU2017135487A (en) | 2019-04-08 |
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