Membrane cavity coupling type underwater acoustic board

A coupling-type, sound-absorbing panel technology, which is applied in the direction of sound-generating devices and instruments, can solve the problems of not proposing an underwater low-frequency sub-wavelength sound-absorbing structure, and the effect of lower-frequency sound waves is not good, so as to achieve good broadband sound-absorbing ability and improve Effects of low-frequency sound absorption performance and uniform viscoelastic sound absorption performance
CN112017625APending Publication Date: 2020-12-01HARBIN INST OF TECH
9 Cites 0 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
HARBIN INST OF TECH
Publication Date
2020-12-01

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

The invention aims to provide an underwater sound absorption structure with a good low-frequency sound absorption effect. The average sound absorption coefficient of the sound absorption structure canreach 0.7 or above within the frequency range of 3000Hz. The invention relates to an underwater low-frequency sound absorption structure, in particular to a membrane cavity coupling type underwater acoustic board, which comprises an installation layer, a sound absorption layer and a structure cavity. The average sound absorption coefficient of the sound absorption structure can be 0.7 or above within the frequency range of 3000Hz. The sound absorption layer and the installation layer are laminated and bonded, wherein a plurality of structural cavities are formed in the sound absorption layer,each structural cavity is one or a combination of two of a double-horn shape or a vase shape with the gradually-changed hole diameter, the lower surface of each structural cavity is flush with the bottom surface of the sound absorption layer, a film structure is arranged in each structural cavity, and an asymmetric mass block is arranged on the film structure.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The invention relates to an underwater low-frequency sound-absorbing structure, in particular to a membrane cavity coupling type underwater sound-absorbing panel. Background technique

[0002] As an effective underwater sound-absorbing structure, the sound-absorbing panel can not only control the radiated noise of the ship, but also resist active sonar detection. The sound-absorbing panel is light in weight and small in size, which meets the structural design requirements of light weight and high efficiency for ship noise reduction.

[0003] For the surface sound-absorbing coating of underwater vehicles, rubber damping materials are mainly used at present. Because the low-frequency sound-absorbing performance of a uniform single material is not ideal, and is limited by the law of mass density, traditional underwater sound-absorbing materials are not effective in the low-frequency range. It is not good enough to meet the sound absorption requirements of...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More