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Annular slotted low-frequency underwater sound absorption deep sub-wavelength superstructure

A deep subwavelength, superstructure technology, applied in the direction of sound production equipment, instruments, etc., can solve the problems of unfavorable engineering application, complex low frequency sound absorption structure, difficult to achieve low frequency sound wave absorption, etc., to achieve excellent performance, excellent low frequency sound absorption performance. Effect

Active Publication Date: 2020-09-22
XI AN JIAOTONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005](1) It is difficult to realize the absorption of low-frequency sound waves by deep subwavelength structures;
[0006](2) Low-frequency sound-absorbing structures are generally complicated, which is not conducive to engineering applications

Method used

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  • Annular slotted low-frequency underwater sound absorption deep sub-wavelength superstructure
  • Annular slotted low-frequency underwater sound absorption deep sub-wavelength superstructure
  • Annular slotted low-frequency underwater sound absorption deep sub-wavelength superstructure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] The thickness of the rubber is 30mm, the thickness of the steel plate is 10mm, the side length of the cell is 40mm, the number of annular grooves is 6, the height of the annular groove is 10mm, the groove width of the annular groove is 0.5mm, and the adjacent ring The thickness of the rubber between the grooves is 1mm.

Embodiment 2

[0053] The thickness of the rubber is 40mm, the thickness of the steel plate is 15mm, the side length of the cell is 50mm, the number of circular grooves is 6, the height of the circular groove is 15mm, the groove width of the circular groove is 1mm, adjacent circular grooves The thickness of the rubber between the grooves is 1.5mm.

Embodiment 3

[0055] The thickness of the rubber is 50mm, the thickness of the steel plate is 20mm, the side length of the cell is 60mm, the number of annular grooves is 6, the height of the annular groove is 20mm, the groove width of the annular groove is 1.5mm, and the adjacent ring The thickness of the rubber between the grooves is 2mm.

[0056] Adopt above-mentioned material and structure dimension to carry out numerical simulation, the result that provides embodiment is as follows:

[0057] In terms of acoustic performance of the present invention, refer to figure 2 Shown are the sound absorption coefficients of three embodiments of an annular slotted low-frequency underwater sound-absorbing deep sub-wavelength superstructure in the range of 0-1500 Hz.

[0058] It can be seen from the figure that the sound absorption coefficient of Example 1 in the range of 799-1106 Hz is greater than 0.8, and reaches the sound absorption peak at 928 Hz, the peak size is 0.99, and the structural size...

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Abstract

The invention discloses an annular slotted low-frequency underwater sound absorption deep sub-wavelength superstructure. Each cell is of a cube structure, a plurality of annular grooves in each cell are distributed in a concentric circle mode, the annular grooves are located in the center of rubber in the horizontal direction, the annular grooves are located in the lower side of the rubber in thevertical direction, and the plurality of cells are arranged in an array mode to form the annular slotted low-frequency underwater sound absorption deep sub-wavelength superstructure. By means of the structure, low-frequency perfect sound absorption of a deep sub-wavelength size structure is achieved, the structure can be laid on the surface of underwater equipment, the requirement for underwater low-frequency vibration and noise reduction is met, the structure has wide engineering application prospects, and a brand-new solution is provided for the low-frequency vibration and noise reduction problem of the underwater equipment.

Description

technical field [0001] The invention belongs to the technical field of underwater sound absorption, and in particular relates to an annular slotted low-frequency underwater sound-absorbing deep subwavelength superstructure. Background technique [0002] Acoustic waves are currently the only communication method that can transmit information over long distances underwater. Therefore, for underwater structures, the problem of vibration and noise reduction has always been a major engineering problem in the field of underwater acoustics. Due to the longer wavelength of underwater low-frequency sound waves, the wavelength of 1000Hz sound waves can reach 1.5m, which is far larger than the size of general sound-absorbing structures. Therefore, compared with high-frequency sound waves, low-frequency sound waves are more difficult to deal with. [0003] In this regard, researchers have conducted extensive research on underwater sound-absorbing structures under water backing, steel ba...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10K11/172G10K11/162
CPCG10K11/172G10K11/162
Inventor 辛锋先卢天健段明宇于晨磊
Owner XI AN JIAOTONG UNIV
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