Bubble curtain / foam board composite device for underwater sound absorption and noise reduction and noise reduction method

Abstract

The invention discloses a bubble curtain / foam board composite noise reduction method for underwater sound absorption and noise reduction. The method enables bubbles to move upward between two porous surfaces opposite to each other on two foam boards to form a bubble curtain, thereby realizing the combination of the bubble curtain noise reduction and the foam material noise reduction. With the help of the porous surfaces of the foam boards, the bubbles can be continuously refined through the collision between the two during the bubble rising process, thereby further enhancing the sound absorption and noise reduction effect of the bubble curtain. The foam boards can support the bubble curtain, weaken the influence of airflow and water flow on the bubble curtain, and stabilize the noise reduction effect.

Description

Technical Field

[0001] The invention belongs to the technical field of sound absorption and noise reduction, and specifically relates to a bubble curtain / foam board composite device for underwater sound absorption and noise reduction and a noise reduction method. Background Art

[0002] Underwater construction work, high-frequency vibration of equipment, ship navigation and missile launching processes will all generate a lot of noise. In particular, the installation and operation of offshore wind power equipment, oil exploration and actual combat exercises all require noise reduction to reduce the harm of noise to marine life and the health of surrounding people.

[0003] At present, the commonly used underwater noise reduction methods mainly include: (1) installing a sleeve with a sound-absorbing material on the vibration device that is the main source of noise. However, the sleeve is expensive and is only applicable to some specific devices in the construction process. The application range is very small and the installation process has great limitations; (2) setting up a sound insulation device around the noise source to reduce the transmission of noise to the outside, but the noise reduction effect is not ideal; (3) setting up a bubble curtain around the noise source. By arranging a water pipe system on the seabed surface, an air water pump introduces air into the duct, and the bubbles rising from the pipe mouth form a closed bubble curtain. Due to the difference in density between air and water, the bubble curtain produces high damping loss and scattering on noise propagation, and brings the noise out of the water and discharges it into the air for noise reduction. However, the bubble curtain is easily affected by water flow and air flow, and there is a problem of unstable effect. Summary of the invention

[0004] In order to improve the noise reduction effect, expand the application scope and solve the problem of unstable noise reduction effect, the present invention discloses a bubble curtain / foam board composite device and a noise reduction method for underwater sound absorption and noise reduction.

[0005] The bubble curtain / foam board composite noise reduction method for underwater sound absorption and noise reduction enables bubbles to move upward between two opposite porous surfaces of two foam boards to form a bubble curtain, thereby achieving a combination of bubble curtain noise reduction and foam material noise reduction.

[0006] The bubble curtain / foam board composite device for underwater sound absorption and noise reduction comprises two foam boards which are relatively distributed and connected as a whole, and a space is reserved between two opposite porous surfaces of the two foam boards for accommodating a pipeline system connected to a gas compression pump above the water surface to allow bubbles to move upward to form a bubble curtain when noise is generated.

[0007] Furthermore, the pipeline system includes an air supply pipeline connected to a gas compression pump above the water surface, and an air jet pipeline connected to the air supply pipeline and located at the bottom of the interval. The air jet pipeline is provided with spray holes along the length direction for spraying gas into the water to form bubbles.

[0008] Furthermore, two foam boards form a spliced ​​wall.

[0009] Furthermore, the two foam boards form an integrated wall.

[0010] Furthermore, any one of the two foam boards is selected from an organic foam material board, a plant fiber foam material board, a metal foam material board, and a ceramic foam material board.

[0011] The present invention discloses a bubble curtain / foam board composite device and a noise reduction method for underwater sound absorption and noise reduction, which combines two noise reduction methods and has the following beneficial effects:

[0012] (1) Both bubble curtains and foam materials have good sound absorption and noise reduction effects. The sound absorption and noise reduction effects can be further improved after the two are combined;

[0013] (2) With the help of the porous surface of the foam board, the bubbles can be continuously refined through the collision between the two during the rising process of the bubbles, thereby further enhancing the sound absorption and noise reduction effect of the bubble curtain;

[0014] (3) The foam board can support the bubble curtain, weaken the influence of air flow and water flow on the bubble curtain, and stabilize the noise reduction effect;

[0015] (4) The bubble curtain / foam board composite device can be installed outside the noise source and is suitable for various underwater noise reduction environments, such as underwater construction work, high-frequency vibration of equipment, ship navigation and missile launch;

[0016] (6) The bubble curtain / foam board composite device can manufacture underwater sound-absorbing and noise-reducing devices of different shapes by splicing or processing multiple foam boards to meet the noise reduction needs of noise sources of different shapes.

[0017] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the following is a detailed description of the preferred embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of a first embodiment of a bubble curtain / foam board composite device for underwater sound absorption and noise reduction of the present invention;

[0019] Figure 2 yes Figure 1 A schematic diagram of the embodiment shown after removing one side of the foam board;

[0020] Figure 3 yes Figure 1 a side schematic view of the illustrated embodiment;

[0021] Figure 4 yes Figure 1A schematic diagram of the embodiment shown in the noise reduction state;

[0022] Figure 5 It is a schematic diagram of a second embodiment of a bubble curtain / foam board composite device for underwater sound absorption and noise reduction of the present invention;

[0023] Figure 6 yes Figure 5 A schematic diagram of the embodiment shown after removing the outer foam plate;

[0024] Figure 7 yes Figure 5 A schematic side view of the illustrated embodiment.

[0025] Among them, 1: square foam board, 2: pipeline system, 2-1: jet pipeline, 2-2: air supply pipeline, 3: bubble curtain, 4: gas compression pump, 5: connecting parts, 6: water, 7: cylindrical foam board. DETAILED DESCRIPTION

[0026] The present invention discloses a bubble curtain / foam board composite noise reduction method for underwater sound absorption and noise reduction, which enables bubbles to move upward between two porous surfaces of two foam boards to form a bubble curtain, thereby realizing the composite noise reduction of the bubble curtain and the foam board. The following embodiment is a specific device for realizing the aforementioned composite noise reduction method.

[0027] See also Figures 1 to 3 , which is the first embodiment of the bubble curtain / foam board composite device for underwater sound absorption and noise reduction of the present invention. This embodiment includes two square foam boards 1 and a pipeline system 2. The two square foam boards are arranged opposite to each other and assembled into a spliced ​​wall using four connectors 5. At the same time, a gap is reserved between the two opposite porous surfaces of the two square foam boards; the pipeline system is arranged in the aforementioned gap, specifically including an air supply pipeline 2-2 extending in the vertical direction, and a jet pipeline 2-1 located at the bottom of the gap and extending in the horizontal direction. The upper end of the air supply pipeline is connected to the gas compression pump 4 located above the water surface, and the lower end is connected to the jet pipeline. The jet pipeline is provided with multiple spray holes along the length direction, and the optimal position of the spray hole is: facing the porous surface of the square foam board.

[0028] Any one of the two square foam boards is selected from one of an organic foam material board, a plant fiber foam material board, a metal foam material board and a ceramic foam material board, that is, the two foam boards can be made of the same material or different materials; the pore diameter of the foam board is 0.1-2mm and the thickness is 0.5-50mm; the connecting piece is any one of a glued part, a riveted part, and a screw and nut assembly part.

[0029] See also Figure 4This embodiment is applicable to various underwater noise reduction environments. For example, for underwater piling operations, multiple spliced ​​walls are assembled to separate the piling area from the non-piling area. The specific method can be: multiple spliced ​​walls are assembled along the circumference and limited to the periphery of the piling pipe by floating blocks, or multiple spliced ​​walls are assembled along the circumference and connected to the outer wall of the piling pipe by a support frame, or multiple spliced ​​walls are assembled along the length direction to isolate the piling pipe on one side. Before construction, start the gas compression pump, and the air flows through the air supply pipe and the jet pipe and then sprays into the water from the spray hole to form bubbles. The bubbles rise in the gap between the two square foam boards to form a bubble curtain, and the foam material noise reduction with good sound absorption and noise reduction effect and the bubble curtain noise reduction are compounded to further improve the noise reduction effect. In the process of rising, the bubbles will continuously collide with the porous surface of the square foam board, and be further cut and refined, so as to improve the noise reduction effect of the bubble curtain and the overall noise reduction effect. At the same time, the square foam board can play a fixed supporting role for the bubble curtain, stabilize the bubble curtain, and weaken the influence of airflow and water flow on the bubble curtain.

[0030] Of course, in other embodiments of the present invention, other forms of spliced ​​walls can be obtained by using foam boards of other shapes (such as arc-shaped) instead of square foam boards according to actual needs.

[0031] See also Figures 5 to 7 , which is the second embodiment of the bubble curtain / foam board composite device for underwater sound absorption and noise reduction of the present invention. This embodiment includes two cylindrical foam boards 8 and a pipeline system. The small-diameter cylindrical foam board is located in the large-diameter cylindrical foam board and is assembled into an integrated wall through a connector 5. At the same time, an annular interval is reserved between the porous surfaces of the two cylindrical foam boards; the pipeline system includes an air supply pipeline extending in the vertical direction, and an air jet pipeline located at the bottom of the annular interval and extending in the horizontal direction. The upper end of the air supply pipeline is connected to the gas compression pump located above the water surface, and the lower end passes through the two cylindrical foam boards and is connected to the air jet pipeline. The air jet pipeline is provided with multiple spray holes along its length.

[0032] In order to meet the noise reduction requirements of the cylindrical noise source, the foam board is designed to be cylindrical in shape in this embodiment, and the integrated wall formed by two cylindrical foam boards can be individually limited to the periphery of the noise source. In view of the above-mentioned design ideas, in other embodiments of the present invention, the foam board can be designed to be spherical, arc-shaped, square, cover-shaped, umbrella-shaped or other special shapes according to the shape of the noise source to obtain other forms of integrated walls.

[0033] Of course, in other embodiments of the present invention, the cylindrical foam plate described in the second embodiment can be rotated 90 degrees, and an annular air jet pipe is arranged at the bottom of the annular interval, and the lower end of the air supply pipe passes through the annular interval and is connected to the air jet pipe. Furthermore, according to the length of the cylindrical foam plate, multiple annular air jet pipes can be arranged from bottom to top in the annular interval.

[0034] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Other modifications or equivalent substitutions made to the technical solution of the present invention by ordinary technicians in the field should be included in the scope of the claims of the present invention as long as they do not depart from the design and scope of the technical solution of the present invention.

Claims

1. A bubble curtain / foam board composite device for underwater sound absorption and noise reduction, characterized in that It comprises two foam plates which are relatively distributed and connected as a whole, and a gap is reserved between two opposite porous surfaces of the two foam plates for accommodating a pipeline system connected to a gas compression pump above the water surface so as to allow bubbles to move upward to form a bubble curtain when noise is generated; the pipeline system comprises an air supply pipeline connected to the gas compression pump above the water surface, and an air jet pipeline which is connected to the air supply pipeline and is located at the bottom of the gap, and the air jet pipeline is provided with spray holes along the length direction for spraying gas into the water to form bubbles, and the spray holes face the porous surfaces of the foam plates.

2. The bubble curtain / foam board composite device for underwater sound absorption and noise reduction according to claim 1, characterized in that Two foam boards form a spliced ​​wall.

3. The bubble curtain / foam board composite device for underwater sound absorption and noise reduction according to claim 1, characterized in that Two foam panels form a one-piece wall.

4. A bubble curtain / foam board composite device for underwater sound absorption and noise reduction according to any one of claims 1 to 3, characterized in that Any one of the two foam boards is selected from one of an organic foam material board, a plant fiber foam material board, a metal foam material board and a ceramic foam material board.

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