False ceiling
    4.
    发明授权
    False ceiling 失效
    虚假天花板

    公开(公告)号:US5740649A

    公开(公告)日:1998-04-21

    申请号:US537674

    申请日:1995-10-19

    摘要: A false ceiling for buildings designed to absorb acoustic waves has perfoed plates. One or several suspended plates (1, 6) are provided which are so hard that they cannot vibrate. The plates have a plurality of regularly or irregularly arranged holes (4, 7) with 0.2-3 mm diameter, the surface of the holes being less than 4% of the total surface. The air in the holes (4, 7) forms with the overlying cavities (11) a dampening active mass system of the foil absorber type.

    摘要翻译: PCT No.PCT / EP94 / 01277 Sec。 371 1995年10月19日日期 102(e)1995年10月19日PCT PCT 1994年4月20日PCT公布。 公开号WO94 / 24382 日期1994年10月27日设计用于吸收声波的建筑物的假天花板具有多孔板。 提供了一个或多个悬挂板(1,6),它们非常硬,使得它们不能振动。 这些板具有多个规则或不规则布置的孔(4,7),其直径为0.2-3mm,孔的表面小于总表面的4%。 孔(4,7)中的空气与覆盖空腔(11)形成箔吸收器类型的阻尼活性质量系统。

    Sound attenuating laminate installation for jet aircraft engines
    5.
    发明授权
    Sound attenuating laminate installation for jet aircraft engines 失效
    用于喷气式飞机发动机的声衰减层压装置

    公开(公告)号:US4947958A

    公开(公告)日:1990-08-14

    申请号:US333345

    申请日:1989-04-05

    申请人: Stephen J. Snyder

    发明人: Stephen J. Snyder

    IPC分类号: B32B15/04 E04B1/84

    摘要: The present invention relates to a novel installation of a sound attenuating laminate. More particularly, the invention relates to the installation of a simpler, lighter, and more effective noise attenuating laminate which is made up of seven layers of material. The laminate includes a duct liner, a moisture barrier, a first protecting layer, a screen, acoustic attenuating material, a second protecting layer, and a solid backing sheet. The laminate is readily incorporated into various sections of a jet engine compartment in order to attenuate the sound produced by the jet engine. Hollow rivets are used to conduct acoustical energy to the intermediary layers of the laminate. This novel means for conducting the acoustical energy to the intermediary layers of the laminate also allows for an improved anti-icing system, for more efficient jet engine operation, and for more efficient dissipation of acoustic energy.

    摘要翻译: 本发明涉及一种声音衰减层压板的新颖安装。 更具体地,本发明涉及由七层材料构成的更简单,更轻和更有效的噪声衰减层压板的安装。 层压板包括管道衬垫,防潮层,第一保护层,筛网,声衰减材料,第二保护层和固体背衬片材。 层压板容易地结合到喷气发动机室的各个部分中,以便减弱由喷气发动机产生的声音。 空心铆钉用于向层压板的中间层传导声能。 这种用于对层压体的中间层进行声能的新颖手段还允许改进的防冰系统,用于更有效的喷气发动机操作以及更有效地消散声能。