一种低通声滤波器组宽频吸声体
    2.
    发明申请

    公开(公告)号:WO2023028813A1

    公开(公告)日:2023-03-09

    申请号:PCT/CN2021/115552

    申请日:2021-08-31

    IPC分类号: G10K11/16 G10K11/162

    摘要: 一种低通声滤波器组宽频吸声体,包括一张微穿孔板、微穿孔板后空腔、与板后空腔相通的一条等截面或变截面曲折声波主通道,以及从声波主通道入口开始沿声波主通道按照截止频率从高到低的顺序布置的多个低通声滤波器。微穿孔板一侧为外部声波入射端,另一侧后布置有空腔,空腔末端与声波主通道的始端相通;外部入射的声波通过微穿孔板进入其后的空腔,而后由空腔进入声波主通道;曲折声波主通道是一条末端封闭的、迂回弯曲的通道,以单层或多层的型式在吸声体中紧密布置;当声波主通道以多层型式布置时,相邻层之间的通道相通,以保证声波主通道从始端到末端连通。该低通声滤波器组宽频吸声体,既能实现采用一条声波主通道,满足一张微穿孔板对吸收不同中心频带声波的相位传播延迟的要求,同时结合声波主通道曲折布置,也能实现超薄的结构尺寸。

    MÓDULO PRISMÁTICO PARA CONTROLO ACÚSTICO AJUSTÁVEL, PAINEL, MÉTODO DE OPERAÇÃO E RESPETIVO MÉTODO DE FABRICO

    公开(公告)号:WO2022254341A1

    公开(公告)日:2022-12-08

    申请号:PCT/IB2022/055093

    申请日:2022-05-31

    IPC分类号: G10K11/16 E04B1/99

    摘要: A presente descrição diz respeito a um módulo prismático para controlo acústico ajustável, em que o referido módulo compreende: um suporte prismático oco; um revestimento flexível elástico em que o revestimento está disposto de forma tensionada numa face de topo do suporte prismático; uma vareta disposta no oco do suporte prismático e deslocável entre uma posição estendida, uma posição intermédia e uma posição recolhida; em que a vareta está acoplada ao revestimento em que: quando a vareta está na posição estendida, o revestimento tem uma forma afunilada para o exterior da estrutura; quando a vareta está na posição recolhida, o revestimento tem uma forma afunilada para o interior da estrutura; quando a vareta está na posição intermédia, o revestimento tem uma forma planar. A presente descrição diz ainda respeito ao método de fabrico e ao método de operar o referido módulo.

    ULTRA-LOW FREQUENCY ACOUSTIC ABSORBER
    5.
    发明申请

    公开(公告)号:WO2022222984A1

    公开(公告)日:2022-10-27

    申请号:PCT/CN2022/088104

    申请日:2022-04-21

    IPC分类号: G10K11/16

    摘要: An ultra-low frequency acoustic absorber (10) and a hybrid membrane resonator (210). The ultra-low frequency acoustic absorber (10) includes a hollow housing (12) having opposed first and second open ends (22, 24), and a plurality of metallic mesh layers (16) stacked within the housing (12). In order to secure the plurality of metallic mesh layers (16) within the hollow housing (12), first and second mesh covers (18, 20) may cover the first and second open ends (22, 24) of the hollow housing (12) respectively. At least one spacer (14) may be provided to form a gap between the housing (12) and a support surface, such as a hard wall (W) or the like. The at least one spacer (14) may have a length sufficient to space the ultra-low frequency acoustic absorber (10) at the position of optimal absorption based on an acoustic soft boundary condition (ASBC). Wherein, each of the metallic mesh layers has an average pore size of approximately 4 X 10-4 mm2. The hybrid membrane resonator (210) includes a housing (222) having an open end (224) and an opposed closed end (226); and a decorated membrane resonator (216) covering and sealing the open end (224) of the housing (222), wherein a cavity (228) is defined within the housing (222), between the decorated membrane resonator (218) and the closed end (226) of the housing (222), the closed end (226) of the housing (222) defining a reflecting back plate, wherein, at least one hole (212) is formed through a sidewall of the housing, the at least one hole (212) being configured to create an acoustic soft boundary condition within the cavity and behind the decorated membrane resonator (210). Wherein, a Fabry-Pérot resonator (214) mounted to an outer face of the closed end (226) of the housing (222), a channel (230) being formed through the closed end (226) of the housing (210) such that the cavity (228) communicates with an interior of the Fabry-Pérot resonator (214).

    ATTÉNUATEUR DU BRUIT GÉNÉRÉ PAR UNE POMPE CENTRIFUGE

    公开(公告)号:WO2022214500A1

    公开(公告)日:2022-10-13

    申请号:PCT/EP2022/059032

    申请日:2022-04-05

    发明人: GUERRY, Pascal

    摘要: Ce dispositif (200) d'atténuation acoustique pour un dispositif électromécanique parcouru par un flux gazeux susceptible de propager des ondes acoustiques, comprend des orifices d'entrée (202) et de sortie (204) d'un flux gazeux, en particulier en vue d'une évacuation dans l'atmosphère. Selon l'invention, le dispositif (200) comprend un canal (206) globalement annulaire définissant un trajet d'écoulement du flux gazeux sensiblement circulaire autour d'un axe principal (X) entre les orifices d'entrée (202) et de sortie (204), et une pluralité d'éléments atténuateurs acoustiques (210) accordés sur une fréquence de résonance d'atténuation avec une bande de fréquences d'atténuation associée, répartis en série circulairement le long dudit canal (206) de façon à être en interaction avec le flux gazeux s'écoulant dans le canal (206), les éléments atténuateurs acoustiques (210) étant formés par des cavités (212) de résonateurs quart d'onde.

    COATED BUILDING PANELS
    7.
    发明申请

    公开(公告)号:WO2022192369A1

    公开(公告)日:2022-09-15

    申请号:PCT/US2022/019512

    申请日:2022-03-09

    摘要: Described herein is a coated building panel comprising an acoustical body comprising a first major surface and a side surface that intersects the first major surface, a coating applied to the first major surface, the coating comprising a polymeric binder, a pigment, and a hydrophobic component present in an amount ranging from about 1.0 wt. % to about 8.0 wt. % based on the total weight of the coating; and wherein the pigment and polymeric binder are present in a weight ratio ranging from about 3.5:1 to about 6.5:1.

    ACOUSTIC BARRIER
    8.
    发明申请
    ACOUSTIC BARRIER 审中-公开

    公开(公告)号:WO2022188901A1

    公开(公告)日:2022-09-15

    申请号:PCT/CZ2021/000053

    申请日:2021-11-08

    IPC分类号: G10K11/16 E04B1/84

    摘要: The invention concerns an acoustic barrier between a space with a noise source and a noise receiving space and its subject matter consists in a barrier (1) consisting of a thin plate with both the radii of curvature of a finite size and the same sign. Barrier (1) is equipped with at least one rib (10) of a closed or an open shape. Ribs (10) consist of thin plates with both the radii of curvature of a finite size and the same sign, whereas a thickness of barrier (1) is equal or less than a thickness of ribs (10).

    意匠材セット及び意匠材セットの設置方法

    公开(公告)号:WO2022172552A1

    公开(公告)日:2022-08-18

    申请号:PCT/JP2021/042804

    申请日:2021-11-22

    IPC分类号: E04B1/84 E04F13/08 G10K11/16

    摘要: 取付体(3a~3d)の形状は、四角形に内接する1倍形状、又は四角形を連続して整数個並べて形成される外形の各辺に内接する整数倍形状であり、カバーは、1倍取付体(3a)に取り付け可能な大きさの1倍カバー(2a)、又は整数倍取付体(3b~3d)に取り付け可能な大きさの整数倍カバー(2b~2d)を含んでおり、1倍取付体(3a)への1倍カバー(2a)の取り付け、整数個分の1倍取付体(3a)への整数倍カバー(2b~2d)の取り付け、又は整数倍取付体(3b~3d)への整数倍カバー(2b~2d)の取り付けにより、複数のカバーで構成される意匠パターンのバリエーションを設定できる。

    吸音材用不織布積層体および吸音材

    公开(公告)号:WO2022168748A1

    公开(公告)日:2022-08-11

    申请号:PCT/JP2022/003266

    申请日:2022-01-28

    发明人: 中原誠 大森平

    摘要: 本発明は、成形時の厚さ回復性、追従性に優れ、吸音性能に優れた吸音材用不織布および吸音材を提供することを課題とする。かかる課題を解決するために、 不織布層αと不織布層βとが積層された吸音材用不織布積層体であって、不織布層αは、繊度が0.4~3.8dtexの短繊維Aと、繊度が4.0~22.0dtexの短繊維Bと、融点が135~190℃の樹脂を外表層に含む短繊維C1とを含有し、前記不織布層αの全質量に対する前記短繊維Aと前記短繊維Bの合計含有質量は86~98質量%であり、前記不織布層αの全質量に対する前記短繊維C1の含有質量は2~14質量%であり、前記短繊維Aと前記短繊維Bの含有質量比(短繊維Aの含有質量/短繊維Bの含有質量)は、0.05~3.80であり、不織布層βは、融点が70~190℃の樹脂を外表層に含む短繊維C2を含有し、前記不織布層βの全質量に対する前記短繊維C2の含有質量は、20~60質量%であり、かつ、前記不織布層αと前記不織布層βが部分融着された吸音材用不織布積層体である。