CN111792044A - 构成吸声材料的组件 - Google Patents

构成吸声材料的组件 Download PDF

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CN111792044A
CN111792044A CN202010242072.2A CN202010242072A CN111792044A CN 111792044 A CN111792044 A CN 111792044A CN 202010242072 A CN202010242072 A CN 202010242072A CN 111792044 A CN111792044 A CN 111792044A
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assembly
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弗洛里安·拉维斯
弗洛朗·梅卡
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Airbus Operations SAS
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    • 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 form; Layered products having particular features of form
    • B32B3/02—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form characterised by features of form at particular places, e.g. in edge regions
    • B32B3/08—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form characterised by features of form at particular places, e.g. in edge regions characterised by added members at particular parts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64D—EQUIPMENT FOR FITTING IN OR TO AIRCRAFT; FLIGHT SUITS; PARACHUTES; ARRANGEMENTS OR MOUNTING OF POWER PLANTS OR PROPULSION TRANSMISSIONS IN AIRCRAFT
    • B64D29/00—Power-plant nacelles, fairings, or cowlings
    • B64D29/06—Attaching of nacelles, fairings or cowlings
    • 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 form; Layered products 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 form; Layered products 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 form; Layered products 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
    • 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
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/20—Layered products comprising a layer of metal comprising aluminium or copper
    • 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 form; Layered products having particular features of form
    • B32B3/26—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer
    • B32B3/266—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer characterised by an apertured layer, the apertures going through the whole thickness of the layer, e.g. expanded metal, perforated layer, slit layer regular cells B32B3/12
    • 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 form; Layered products having particular features of form
    • B32B3/26—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer
    • B32B3/30—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer characterised by a layer formed with recesses or projections, e.g. hollows, grooves, protuberances, ribs
    • 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
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • 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
    • 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
    • G10K11/162—Selection of materials
    • 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
    • G10K11/162—Selection of materials
    • G10K11/168—Plural layers of different materials, e.g. sandwiches
    • 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
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/10—Properties of the layers or laminate having particular acoustical properties
    • B32B2307/102—Insulating
    • 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
    • B32B2605/00—Vehicles
    • B32B2605/18—Aircraft
    • 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
    • G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
    • G10K2210/10—Applications
    • G10K2210/107—Combustion, e.g. burner noise control of jet engines
    • 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
    • G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
    • G10K2210/10—Applications
    • G10K2210/128—Vehicles
    • G10K2210/1281—Aircraft, e.g. spacecraft, airplane or helicopter

Abstract

本发明涉及一种构成吸声材料的组件(100)，所述组件包括第一面板(102)，第二面板(104)，所述第二面板穿设有孔(106)，中间面板(110)，所述中间面板穿设有通孔(132)，并且布置在所述第一面板与所述第二面板之间，第一结构(112)，所述第一结构在所述第一面板与所述中间面板之间，并且包括第一笼体(202)，第二结构(114)，所述第二结构在所述第二面板与所述中间面板之间，并且包括第二笼体(214)，以及对于所述中间面板的每个通孔的管件(130)，所述管件在其两个端部处开口，其中，所述管件的端部中的一个端部在所述通孔处固定至所述中间面板，并且其中，所述管件的另一个端部容纳在第一笼体内。这种组件使得可以获得宽频带衰减并且易于制造。

Description

构成吸声材料的组件
技术领域
本发明涉及一种构成吸声材料的组件。
背景技术
飞行器的发动机在操作期间产生噪声。这个发动机容纳在短舱中，其目的是使这噪声衰减，已知的是在短舱的结构中将构成吸声材料的组件安装在发动机周围。
这种构成吸声材料的组件具有例如蜂窝结构的形式。这种蜂窝结构包括两个平行的面板，其中一个面板被穿孔，并且相对于彼此并列的六边形小室布置这些面板之间。
在其他的应用中，还已知的是使用放置在腔室中的截头锥体。
虽然，从声学角度看，这种组件提供了令人满意的结果，然而期望的是找到以下构成吸声材料的组件，该组件使得可以使多个声学频率衰减并且容易制造。
发明内容
本发明的目的是提出一种构成吸声材料的组件，该组件能够使多个声学频率衰减并且易于制造。
为此，提出一种构成吸声材料的组件，所述组件包括：
-第一面板，
-第二面板，所述第二面板穿设有孔，
-中间面板，所述中间面板穿设有通孔，并且布置在所述第一面板与所述第二面板之间，
-第一蜂窝结构，所述第一蜂窝结构在所述第一面板与所述中间面板之间延伸，并且包括第一笼体，
-第二蜂窝结构，所述第二蜂窝结构在所述第二面板与所述中间面板之间延伸，并且包括第二笼体，以及
-对于所述中间面板并且对于所述中间面板的每个通孔的管件，所述管件在其两个端部处开口，其中，所述管件的端部中的一个端部在所述通孔处固定至所述中间面板，并且其中，所述管件的另一个端部容纳在第一笼体内。
这种组件使得可以获得宽频带衰减并且易于制造。
有利地，至少两个管件具有不同的长度。
有利地，所述中间面板、所述第二面板、以及所述管件由声学刚性材料生产。
附图说明
通过阅读下面对实施方式实例的描述，本发明的上述特征以及其他特征将更加清楚地显现，所述描述关于附图给出，在附图中：
[图1]是根据本发明的构成吸声材料的组件的截面放大视图。
具体实施方式
图1示出了根据本发明的构成吸声材料的组件100。组件100包括彼此相距一定距离的第一面板102和第二面板104。这些面板中的一个面板(在这种情况下为第二面板104)穿设有穿过面板的孔106，以允许声波通过。
中间面板110布置在第一面板102与第二面板104之间。三个面板102、104和110是平行的。
第一蜂窝结构112在第一面板102与中间面板110之间延伸，并且第二蜂窝结构114在第二面板104与中间面板110之间延伸。
因此，根据堆叠方向50，组件100依次包括第一面板102、第一蜂窝结构112、中间面板110、第二蜂窝结构114、以及第二面板104。
第一结构112包括一系列第一笼体202，其中每个第一笼体202都是中空的，并且由在与堆叠方向50的平行的平面中延伸的壁204界定。以优选的方式，每个第一笼体202界定了六边形小室，但是可以设想到其他的形式。
类似地，第二结构114包括一系列第二笼体214，其中每个第二笼体214都是中空的，并且由在平行于堆叠方向50的平面中延伸的壁216界定。以优选的方式，每个第二笼体214界定了六边形小室，但是可以设想到其他的形式。
第一面板102和第一结构112例如通过粘接、焊接等固定至彼此。
第二面板104和第二结构114例如通过粘接、焊接等固定至彼此。
第一结构112和中间面板110例如通过粘接、焊接等固定至彼此。附图标记116示出了交联的粘合片。
第二结构114和中间面板110例如通过粘接、焊接等固定至彼此。附图标记118示出了交联的粘合片。
第二结构114连同第二面板104和中间面板110形成使声学高频率衰减的四分之一波长谐振器。因此，组件100使得可以获得宽频带衰减并且易于制造。
对于每个第一笼体202，组件100还包括至少一个管件130，该管件在其两个端部处开口，并且在与堆叠方向50平行的方向上延伸。
每个管件130的端部中的一个端部在所述面板为此目的而具有的通孔132处固定至中间面板110，该通孔穿过所述面板。因此，第二笼体214与第一笼体202之间经由管件130而存在流体连续性。管件130例如通过焊接、粘接等固定至中间面板110。
每个管件130的另一个端部容纳在第一笼体202的内部并且在其中开口。
第一结构112连同第一面板102、中间面板110、以及管件130形成使声学低频率衰减的亥姆霍兹(Helmholtz)谐振器。
在第一结构112内衰减的频率尤其取决于每个第一笼体202的管件130的数量、管件130的直径、以及管件130的长度。
因此，为了使更宽的频谱衰减，管件130的长度从第一笼体202到另一笼体是不同的。也就是说，至少两个管件130具有不同的长度。
根据具体的实施例，例如，每个管件的内直径在0.5mm与3mm之间，并且管件130的长度可以例如在10mm与25mm之间变化。
在飞行器发动机的情况下，并且根据特定的实施例，在进气的情况下，第二面板104所穿设的穿孔水平为6％至8％的量级，并且在推力反向器的情况下，为13％至15％的量级。
构成组件100的各种元件可以由不同的材料生产，例如，诸如铝或铝合金的金属材料或复合材料。将元件固定在一起的方法将同样取决于所用的材料。
中间面板110、第二面板104、以及管件130由声学刚性材料生产，即，这些材料不会通过声波的作用而变形。另一方面，中间面板110、第二面板104、以及管件130由可机械可变形或柔性的材料生产，使得可以将它们应用在双弯曲部上。
根据具体的实施例，第二结构114的高度为25mm的量级，以便在飞行器发动机的背景下使感兴趣的频率衰减，并且第一结构112的高度为15mm的量级。
用于制造组件100的方法是简单的，并且该方法包括：
-第一供应步骤，在该第一供应步骤期间，提供具有通孔132的中间面板110和管件130，
-第一组装步骤，在该第一组装步骤期间，在每个通孔132处，将管件130固定至中间面板110，
-第二供应步骤，在该第二供应步骤期间，供应这样组装的第一面板102和第一结构112，
-第二组装步骤，在该第二组装步骤期间，将中间面板110固定至第一结构112，
-第三供应步骤，在该第三供应步骤期间，供应这样组装的第二面板104和第二结构114，
-第四组装步骤，在该第四组装步骤期间，将中间面板110固定至第二结构114。
其中，第二结构114粘接至中间面板，在通孔132处不存在交联的粘合片，以便防止管件130的阻塞。

Claims (3)

1.一种构成吸声材料的组件(100)，所述组件包括：
-第一面板(102)，
-第二面板(104)，所述第二面板穿设有孔(106)，
-中间面板(110)，所述中间面板穿设有通孔(132)，并且布置在所述第一面板(102)与所述第二面板(104)之间，
-第一蜂窝结构(112)，所述第一蜂窝结构在所述第一面板(102)与所述中间面板(110)之间延伸，并且包括第一笼体(202)，
-第二蜂窝结构(114)，所述第二蜂窝结构在所述第二面板(104)与所述中间面板(110)之间延伸，并且包括第二笼体(214)，以及
-对于所述中间面板(110)并且对于所述中间面板(110)的每个通孔(132)的管件(130)，所述管件在其两个端部处开口，其中，所述管件(130)的端部中的一个端部在所述通孔(132)处固定至所述中间面板(110)，并且其中，所述管件(130)的另一个端部容纳在第一笼体(202)内。
2.根据权利要求1所述的组件(100)，其特征在于，至少两个管件(130)具有不同的长度。
3.根据权利要求1和2之一所述的组件(100)，其特征在于，所述中间面板(110)、所述第二面板(104)、以及所述管件(130)由声学刚性材料生产。
CN202010242072.2A 2019-04-02 2020-03-31 构成吸声材料的组件 Pending CN111792044A (zh)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2870857A (en) * 1956-03-06 1959-01-27 Celotex Corp Translucent acoustical correction ceiling construction
US3948346A (en) * 1974-04-02 1976-04-06 Mcdonnell Douglas Corporation Multi-layered acoustic liner
CN105173059A (zh) * 2015-08-13 2015-12-23 中国航空工业集团公司西安飞机设计研究所 一种双层蜂窝降噪结构
CN105493176A (zh) * 2013-08-12 2016-04-13 赫克赛尔公司 用在声学结构中的声波导
CN105719634A (zh) * 2014-12-04 2016-06-29 北京市劳动保护科学研究所 宽带复合吸声结构
CN108725748A (zh) * 2017-04-25 2018-11-02 空中客车运营简化股份公司 声学处理面板及飞行器

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2038410B (en) * 1978-12-27 1982-11-17 Rolls Royce Acoustic lining utilising resonance
US4421811A (en) * 1979-12-21 1983-12-20 Rohr Industries, Inc. Method of manufacturing double layer attenuation panel with two layers of linear type material
US4743740A (en) * 1985-10-07 1988-05-10 Rohr Industries, Inc. Buried element deicer
US6619913B2 (en) * 2002-02-15 2003-09-16 General Electric Company Fan casing acoustic treatment
US9514734B1 (en) * 2011-06-30 2016-12-06 The United States Of America As Represented By The Administrator Of National Aeronautics And Space Administration Acoustic liners for turbine engines
US11092077B2 (en) * 2018-03-28 2021-08-17 Pratt & Whitney Canada Corp. Aircraft component and method of manufacture

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2870857A (en) * 1956-03-06 1959-01-27 Celotex Corp Translucent acoustical correction ceiling construction
US3948346A (en) * 1974-04-02 1976-04-06 Mcdonnell Douglas Corporation Multi-layered acoustic liner
CN105493176A (zh) * 2013-08-12 2016-04-13 赫克赛尔公司 用在声学结构中的声波导
CN105719634A (zh) * 2014-12-04 2016-06-29 北京市劳动保护科学研究所 宽带复合吸声结构
CN105173059A (zh) * 2015-08-13 2015-12-23 中国航空工业集团公司西安飞机设计研究所 一种双层蜂窝降噪结构
CN108725748A (zh) * 2017-04-25 2018-11-02 空中客车运营简化股份公司 声学处理面板及飞行器

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US20200316900A1 (en) 2020-10-08

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