The invention aims to provide an absorber which can enable a submarine to realize underwater invisibility in low-frequency detection of sonar when the absorber is attached to the surface of the submarine, and belongs to the technical field of acoustics. According to the invention, a hard baffle plate structure, a viscous-elastic material, an air gap and a metal core are coupled, so that a closed pressure-resistant underwater sound absorber for realizing underwater low-frequency broadband absorption is designed, and the absorber is periodically composed of unit structures. Each unit structure relates to a plurality of hard baffle structures, and the whole unit structure presents a closed surface and has good stability in an underwater environment. A viscous-elastic material with a damping property is laid on the inner side of the baffle, and an air gap is added between the inner wall of the baffle and the viscous-elastic material to increase vibration of the viscous-elastic material so as to increase loss of incident waves by the absorber. By adjusting all structural parameters, more than 85% of sound waves can be absorbed within the frequency range of 300 Hz to 850 Hz, the average thickness of the absorber is 62 mm, and the average thickness of the absorber is only 1/81 of the wavelength at the position of 300 Hz.

    本发明的目的是提供一种吸收器,使其附着在潜艇表面时能让潜艇在声呐的低频探测中实现水下隐身,属于声学技术领域。本发明通过对硬质挡板结构、粘弹性材料、空气间隙和金属芯进行耦合,设计了一种实现水下低频宽带吸收的封闭式耐压水声吸收器,该吸收器由单元结构周期性组成。单元结构涉及若干硬质挡板结构,整体呈现出一个封闭的表面,在水下环境具有较好的稳定性;在挡板内侧铺设具有阻尼性质的粘弹性材料,并在挡板内壁与粘弹性材料之间添加空气间隙来增大粘弹性材料的振动,以增大吸收器对入射波的损耗。通过调节各结构参数,本发明实现了在300Hz~850Hz频率范围内对声波有85%以上的吸收,吸收器平均厚度为62mm,在300Hz处仅为波长的1/81。


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    Titel :

    Closed pressure-resistant underwater sound absorber for realizing underwater low-frequency broadband absorption


    Weitere Titelangaben:

    一种实现水下低频宽带吸收的封闭式耐压水声吸收器


    Beteiligte:
    YIN JIANBO (Autor:in) / LI YIMING (Autor:in)

    Erscheinungsdatum :

    2023-07-18


    Medientyp :

    Patent


    Format :

    Elektronische Ressource


    Sprache :

    Chinesisch


    Klassifikation :

    IPC:    G10K Tonerzeugungsvorrichtungen , SOUND-PRODUCING DEVICES / B63G OFFENSIVE OR DEFENSIVE ARRANGEMENTS ON VESSELS , Angriffs- oder Verteidigungsanordnungen auf Schiffen



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