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    Sound attenuator
    2.
    发明授权
    Sound attenuator 失效
    声音衰减器

    公开(公告)号：US5117939A

    公开(公告)日：1992-06-02

    申请号：US551361

    申请日：1990-07-12

    申请人： Yoshihiro Noguchi ,  Toshihisa Imai ,  Yutaka Takahashi ,  Ken Morinushi ,  Hideharu Tanaka

    发明人： Yoshihiro Noguchi ,  Toshihisa Imai ,  Yutaka Takahashi ,  Ken Morinushi ,  Hideharu Tanaka

    IPC分类号： F24F13/02 ,  G10K11/16

    CPC分类号： G10K11/16

    摘要： A sound attenuator has at least one sound absorber composed of a hollow body of a hard porous material and an outer or inner layer of air, and exhibits good sound-absorbing property even in a low frequency range, even if the hollow body has a small wall thickness. The hollow body may be provided with projections or a semicircular or otherwise shaped part or parts, or both, serving to maintain the outer or inner layer of air in proper shape. The device is inexpensive and yet is very reliable in quality. When the device is long, the projections in linear form are particularly useful for restraining any flanking transmission of noise and thereby enabling the device to achieve a higher rate of attenuation per unit length. The sound-absorbing property of the device can be controlled over a wide range of frequencies if the hollow body has a porosity varying continuously in a specific direction. The device exhibits an improved sound-absorbing property particularly in a low frequency range if the hollow body is provided with a skin layer on its wall surface facing an air passage.

    Sound absorbing mechanism using a porous material
    5.
    发明授权
    Sound absorbing mechanism using a porous material 失效
    使用多孔材料的吸声机构

    公开(公告)号：US6109388A

    公开(公告)日：2000-08-29

    申请号：US185545

    申请日：1998-11-04

    申请人： Kouji Tsukamoto ,  Katsuhisa Ootsuta ,  Shuichi Tani ,  Masayuki Kurashina ,  Toshihisa Imai

    发明人： Kouji Tsukamoto ,  Katsuhisa Ootsuta ,  Shuichi Tani ,  Masayuki Kurashina ,  Toshihisa Imai

    IPC分类号： E01F8/00 ,  E04B1/82 ,  E04B1/86 ,  G10K11/16 ,  G10K11/172

    CPC分类号： G10K11/172 ,  G10K11/16

    摘要： A sound absorbing mechanism using a porous material has a sound absorbing plate of a thin plate porous material made by partially heating for welding plastic particles and a supporting member for supporting the sound absorbing plate and forming a back air space. More than one pair of resonators having a separated back air space in the aforementioned back air space are fixed to the sound absorbing plate, and the resonators are disposed to be opposed to a sound insulator with the supporting member between. Plural reflecting members or increased sound absorbers may be disposed to be opposed to the surface of the sound absorbing plate opposite to the surface equipped with the resonators, or a perforated protecting plate fixing the plural reflecting members or the increased sound absorbers thereon are may be equipped. The sound absorbing mechanism has a superior sound absorption characteristic from lower frequencies to higher frequencies.

    摘要翻译： 使用多孔材料的吸音机构具有由用于焊接塑料颗粒的部分加热制成的薄板多孔材料的吸声板和用于支撑吸声板的支撑构件并形成后部空间。 在上述背部空间中具有分离的后部空气空间的多于一对谐振器被固定到吸声板，并且谐振器被设置成与支撑构件之间的隔音板相对。 可以将多个反射构件或增加的吸声器设置成与吸音板的与配有谐振器的表面相对的表面相对，或者可以在其上固定多个反射构件或增加的吸声器的穿孔保护板 。 吸声机构具有从低频到高频的优异的吸声特性。