CN-121983010-A - Low flow resistance underwater sound insulation device

Abstract

The application provides a low-flow-resistance underwater sound-insulating device which is characterized by comprising a plurality of air bags with longitudinal sections in a shape capable of being paved, wherein a set gap is kept between each two air bags, and the air bags are distributed perpendicular to the water surface. The application has the advantages of excellent broadband sound insulation performance, capability of effectively inhibiting the influence of various noise sources on the test environment by covering the main frequency band of underwater noise measurement, good hydrodynamic compatibility, low flow resistance maintained while realizing sound isolation by the through-flow design of the air bag array arrangement, capability of avoiding the remarkable disturbance on the test environment, good engineering applicability and economy, convenience in installation, maintenance and expansion by the air bag modularized design, and contribution to large-scale deployment in various water area environments.

Inventors

• JIA HAN
• YANG YUZHEN
• WANG SHUAI
• YANG JUN

Assignees

• 中国科学院声学研究所

Dates

Publication Date

20260505

Application Date

20260112

Claims (6)

1. 1. A low flow resistance underwater sound insulation device, comprising: the longitudinal sections of the air bags are in a compact shape, a set gap is kept among the air bags, and the air bags are distributed perpendicular to the water surface.
2. 2. The low flow resistance underwater sound insulation device as claimed in claim 1, wherein the set gap is less than half of a wavelength corresponding to a set frequency, the set frequency being a maximum frequency required for sound insulation.
3. 3. The low flow resistance underwater sound insulation device as claimed in claim 1, wherein the air bags have a side length of 5-40 times of air bag spacing and a thickness of 5cm-30cm, and the air bag wall thickness is 1mm-5mm.
4. 4. The low flow resistance underwater sound insulation device as claimed in claim 1, wherein the material of the air bag is rubber, PVC or polyurethane.
5. 5. The low flow resistance underwater sound insulation device as claimed in claim 1, wherein adjacent ones of the air bags are connected by a shackle.
6. 6. The low flow resistance underwater sound insulation device as claimed in claim 1, wherein the longitudinal section of the air bag is square, rectangular, diamond, regular hexagon, or other compactable polygonal shape.

Description

Low flow resistance underwater sound insulation device Technical Field The application belongs to the technical field of underwater sound measurement and ocean engineering, and particularly relates to a low-flow-resistance underwater sound insulation device. Background With the rapid development of underwater exploration, ocean engineering and military equipment technologies, the requirement for accurate evaluation of acoustic performance of underwater equipment is increasingly urgent. In complex water area environments such as river channels, lakes, harbors and the like, underwater noise measurement faces the challenge of strong interference of environmental noise for a long time. Broadband background noise generated by water flow turbulence, ship navigation, aquatic organism activities and the like is easy to be overlapped with self radiation noise of target equipment, so that measurement signal distortion is caused, and reliability of equipment acoustic characteristic analysis and performance optimization is severely restricted. Currently, the design of underwater sound insulation structures needs to cope with both acoustic and hydrodynamic constraints. In addition, most of the existing structures have limited sound insulation efficiency in a wide frequency range, and particularly high-efficiency sound insulation is difficult to realize in medium and low frequency bands, so that the requirements of complex underwater sound measurement scenes on wide frequency and high-precision noise control cannot be met. Therefore, how to realize the cooperative optimization of broadband high-efficiency sound insulation and good hydrodynamic performance under the conditions of limited space and load becomes a technical bottleneck to be broken through in the field. Disclosure of Invention The application aims to overcome the defects that the prior art is difficult to meet the requirement of low flow resistance, the water flow resistance is easy to increase, the structural stability is easy to decrease and the like. In order to achieve the above object, the present application provides a low flow resistance underwater sound insulation device comprising: the longitudinal sections of the air bags are in a compact shape, a set gap is kept among the air bags, and the air bags are distributed perpendicular to the water surface. As an improvement of the device, the set gap is smaller than half of the wavelength corresponding to the set frequency, and the set frequency is the maximum frequency required to be insulated. As an improvement of the device, the side length of the air bags is 5-40 times of the air bag spacing, the thickness of the air bags is 5cm-30cm, and the wall thickness of the air bags is 1mm-5mm. As an improvement of the device, the material of the air bag is rubber, PVC or polyurethane. As an improvement of the device, adjacent air bags are connected in a shackle mode. As a modification of the above device, the longitudinal section of the air bag is square, rectangle, diamond, regular hexagon, or other polygonal shapes which can be compactly laid. Compared with the prior art, the application has the advantages that: 1. the broadband sound insulation performance is excellent, the main frequency band of underwater noise measurement is covered, and the influence of various noise sources on the test environment can be effectively restrained; 2. the hydrodynamic compatibility is good, the through-flow design of the air bag array arrangement maintains lower flow resistance while realizing sound isolation, and the obvious disturbance to the test environment is avoided; 3. The air bag has good engineering applicability and economy, and the modularized design of the air bag is convenient for installation, maintenance and expansion, and is beneficial to large-scale deployment in various water area environments. Drawings FIG. 1 is a schematic view of a low flow resistance underwater sound insulation structure with air bags arranged in an array; FIG. 2 shows sound pressure levels of 50Hz-400Hz test points before and after installation of the low-flow-resistance underwater sound insulation structure; FIG. 3 shows sound pressure levels of 400Hz-4000Hz test points before and after installation of the low flow resistance underwater sound insulation structure. Detailed Description The technical scheme of the application is described in detail below with reference to the accompanying drawings. The application provides a low-flow-resistance underwater sound insulation device, which is arranged based on an air bag array, and utilizes the extremely high acoustic impedance difference between air and water body, and combines a barrier mechanism of a free boundary waveguide to plane sound waves to realize high-efficiency sound wave isolation in a wide frequency range. Meanwhile, reasonable gaps are reserved among the air bag units, so that smooth water flow is ensured, and the influence on the stability and safety of the system caused