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Underwater sound absorption structure of sinusoidal partition plates filled viscous-elastic materials

A viscoelasticity and baffle technology, applied in the direction of sound-producing equipment, instruments, etc., can solve the problem of poor broadband sound absorption performance, and achieve the effects of good absorption, improved viscoelasticity, and increased contact area.

Active Publication Date: 2021-01-01
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Abstract
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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 absorption structure filled with sinusoidal partitions and viscoelastic materials, which improves the underwater sound absorption performance of viscoelastic materials through rational design of the structure, and solves the problem of poor broadband sound absorption performance. the puzzle

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Embodiment

[0025] Examples of materials:

[0026] Metal steel: it is treated as rigid in the simulation calculation.

[0027] 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.

[0028] Water: characterized by a density of 1000kg / m 3 , the speed of sound is 1500m / s.

[0029] The structural dimensions of embodiment and comparative example:

[0030] With reference to Fig. 1 (b), in order to guarantee the objectivity of comparison, the thickness h of embodiment and comparative example remains consistent as h=50mm, and the viscoelastic material of each dividing plate and its two sides forms a cell, and the width of cell It is a=40mm. Taking the middle point of the bottom surface as the far point and the horizontal direction as the x-axis, the equation is x=A·sin(B·πy), wherein the bending degree of the zigzag part...

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Abstract

The invention provides an underwater sound absorption structure of sinusoidal partition plates filled viscous-elastic materials. The structure comprises a bottom plate, a plurality of sinusoidal bentpartition plates distributed at equal intervals are rigidly connected to the bottom plate, and the spaces between the sinusoidal bent partition plates are filled with a viscous-elastic material with the density of 500 kg / m<3> to 1000 kg / m<3>. The height of each sinusoidal bent partition plate is recorded as h, the distance between every two adjacent sinusoidal bent partition plates is 4h / 5, and the thickness t of each sinusoidal bent partition plate is h / 60-h / 6. As the shearing loss of the viscous-elastic materials is far greater than the compression loss, the sound wave loss capability of theviscous-elastic materials can be greatly improved. The sinusoidal partition plates provide a larger surface area and a bent path to increase the sound wave propagation distance, so that the sound absorption performance of the viscous-elastic materials can be improved to a great extent. On the other hand, the sinusoidal partition plates are connected with the bottom plate, so that the structure has certain bearing capacity, and the water pressure resistance of the structure is further improved.

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 sinusoidal partitions and viscoelastic materials. 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): G10K11/172G10K11/162
CPCG10K11/172G10K11/162Y02T70/10
Inventor 卢天健辛锋先于晨磊段明宇
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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