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Underwater sound absorption structure with fish scale-shaped partition plates filled with viscouselastic material

A viscoelastic and scale-like technology, which is applied in the field of underwater sound-absorbing composite structure design, can solve the problems of poor broadband sound-absorbing performance of viscoelastic materials, and achieve the effect of improving sound-absorbing performance, simple structure and easy manufacture

Pending Publication Date: 2021-01-29
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Claims
  • Application Information

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Problems solved by technology

[0003] In order to solve the problems of the prior art, the present invention provides an underwater sound-absorbing structure filled with viscoelastic materials with scale-shaped partitions. The underwater sound-absorbing performance of viscoelastic materials is improved through rational design of the structure, and the broadband absorption of viscoelastic materials is solved. Problem with poor acoustic performance

Method used

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  • Underwater sound absorption structure with fish scale-shaped partition plates filled with viscouselastic material
  • Underwater sound absorption structure with fish scale-shaped partition plates filled with viscouselastic material
  • Underwater sound absorption structure with fish scale-shaped partition plates filled with viscouselastic material

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Embodiment

[0023] Examples of materials:

[0024] Metal steel: it is treated as rigid in the simulation calculation.

[0025] Viscoelastic material 1: characterized by a density of 900kg / m 3 , the longitudinal wave velocity is 1000m / s, the longitudinal wave loss factor is 0.09, the shear wave velocity is 100m / s, and the shear wave loss factor is 0.5.

[0026] Water: characterized by a density of 1000kg / m 3 , the speed of sound is 1500m / s.

[0027] The structural dimensions of embodiment and comparative example:

[0028] With reference to Fig. 1 (b), in order to guarantee the objectivity of contrast, the thickness of embodiment and comparative example h keep consistent as h =50mm, the viscoelastic material on both sides of the partition forms a cell, and the width of the cell is a =25mm. Partition thickness t =1mm, the inclination angles of the bottom of the fish scale partition are respectively θ =90°, θ =68° and θ =61° for analysis, where θ =90° indicates a vertical cont...

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Abstract

The invention provides an underwater sound absorption structure with fish scale-shaped partition plates filled with a viscoelastic material. The underwater sound absorption structure comprises a bottom plate, a plurality of partition plates which are distributed at equal intervals and are of a zigzag structure are rigidly connected to the bottom plate, and spaces among the partition plates are filled with the viscoelastic material. Each partition plate of the zigzag structure is of a structure with the bent center, the upper side and the lower side of the bent point are symmetrical about the horizontal plane axis of the bent position, the bottom inclination angle theta of each partition plate is 61-68 DEG, the thickness of the partition plate is 1 / 60 to 1 / 6 of the thickness of the whole structure, and the density of the viscoelastic material is 50-1000 kg / m<3>. Through reasonable design of the structure, the underwater sound absorption performance of the viscoelastic material is improved, and the problem that the broadband sound absorption performance of the viscoelastic material is poor is solved.

Description

technical field [0001] The invention relates to the field of underwater sound-absorbing composite structure design, in particular to an underwater sound-absorbing structure filled with viscoelastic material with fish scale partitions. Background technique [0002] Compared with the sound-absorbing structure in the air environment, underwater sound absorption has always been a more difficult problem due to the higher sound velocity in water and the lower water viscosity. Viscoelastic materials are often used for underwater sound absorption. Viscoelastic materials such as rubber or polyurethane are composed of polymer materials. Under the excitation of sound waves, the molecular chains rub against each other to generate energy loss. Due to the strong penetrating ability of low-frequency sound waves, thicker thicknesses or resonant structures are required to absorb low-frequency sound waves. For example, Alberich-type sound-absorbing coverings introduce cavities inside, and use...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10K11/168
CPCG10K11/168
Inventor 卢天健辛锋先于晨磊段明宇
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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