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    • 4. 发明申请
    • BROADBAND ACOUSTIC ABSORPTION METAMATERIALS
    • 宽带声学吸收材料
    • WO2017187216A1
    • 2017-11-02
    • PCT/IB2016/000598
    • 2016-04-25
    • ACOUSTIC METAMATERIALS CO., LTD.
    • SHENG, PingCHEN, ShuyuYANG, Min
    • G10K11/168G10K11/172
    • G10K11/168G10K11/172
    • A sound suppression structure is made up of plural planar vibration units (131, 132), which establish plural resonant frequencies. A dissipative layer (171) is positioned on a front side of the vibration units (131, 132) with a separation (176) between the dissipative layer (171) and the planar vibration units (131, 132) sufficient to permit substantially free movement of the planar vibration units (131, 132). A shallow sealed gas cell array (161, 162) is positioned behind vibration units (131, 132), with one or more of the planar vibration units (131, 132) forming one side of each sealed gas cell in the array (161, 162). The sealed gas cell array (161, 162) interacts with the planar vibration units (131, 132), to absorb energy at the resonant frequencies. The dissipative layer enhances absorption efficiency, resulting in absorption of energy at frequencies other than the resonant frequencies, and the combination of the planar vibration unit, the shallow sealed gas cells and the dissipative layer providing a plurality of resonant modes for broadband sound absorption.
    • 声音抑制结构由多个平面振动单元(131,132)组成,其建立多个谐振频率。 耗散层(171)位于振动单元(131,132)的前侧,耗散层(171)和平面振动单元(131,132)之间的间隔(176)足以允许基本上自由移动 的平面振动单元(131,132)。 一个浅的密封气室阵列(161,162)位于振动单元(131,132)的后面,一个或多个平面振动单元(131,132)形成阵列(161,162)中每个密封气室的一侧, 162)。 密封的气室阵列(161,162)与平面振动单元(131,132)相互作用,以吸收谐振频率下的能量。 耗散层增强了吸收效率,导致在谐振频率以外的频率处吸收能量,并且平面振动单元,浅密封气室和耗散层的组合提供用于宽带吸声的多个谐振模式。 / p>
    • 6. 发明申请
    • COMPOSITE ELASTIC WAVE WAVEGUIDE
    • 复合弹性波浪波
    • WO2016177994A1
    • 2016-11-10
    • PCT/GB2016/051124
    • 2016-04-22
    • UNIVERSITY OF BATH
    • CHEREDNICHENKO, KirillCOOPER, Shane
    • G10K11/162G10K11/168E02D27/34E04H9/02G10K11/24G10K11/36
    • G10K11/162E02D27/34G10K11/168G10K11/24G10K11/36
    • Aspects and embodiments provide a method of selecting physical characteristics of elements forming a composite elastic waveguide structure configurable to propagate an elastic wave and a composite elastic waveguide structure formed from elements having selected physical characteristics. The method comprises: selecting an elastic wave propagation speed within the composite structure; calculating, based on the selected elastic wave propagation speed, a range of values for at least one the physical characteristic of at least one of at least two elements forming the composite structure, such that propagation of the elastic wave through the combined elements of the composite material at the selected elastic wave propagation speed occurs according to a wave mode in which displacement of a surface of the composite material formed from the at least two elements is substantially zero. Aspects recognise that the propagation of elastic waves in a composite material waveguide may differ from the propagation of elastic waves in a homogeneous material waveguide. In particular, in an appropriately designed composite material, an elastic wave of may propagate through the composite structure and leave, for example, the upper surface of the composite structure substantially unmoved. Homogeneous structures do not allow for propagation of elastic waves in such a manner.
    • 方面和实施例提供了一种选择形成复合弹性波导结构的元件的物理特性的方法,所述复合弹性波导结构可配置成传播弹性波,以及由具有选定物理特性的元件形成的复合弹性波导结构。 该方法包括:在复合结构内选择弹性波传播速度; 基于所选择的弹性波传播速度计算形成复合结构的至少两个元件中的至少一个的至少一个的物理特性的值的范围,使得弹性波通过复合材料的组合元件的传播 根据由至少两个元件形成的复合材料的表面的位移基本上为零的波模式发生选择的弹性波传播速度下的材料。 方面认识到复合材料波导中弹性波的传播可能与均质材料波导中的弹性波的传播不同。 特别地,在适当设计的复合材料中,弹性波可以传播通过复合结构,并且离开例如复合结构的上表面基本上不被移动。 均匀结构不允许以这种方式传播弹性波。