An underwater noise suppression device for offshore wind power single pile construction

Abstract

The present application relates to the field of marine working noise reduction equipment, especially to a kind of offshore wind power single pile construction underwater noise suppression device, including bottom base, noise reduction net group, elastic support component, damping element group, the bottom base is hollow structure, the noise reduction net group is fixedly arranged on the bottom base, the noise reduction net group includes noise reduction outer net and noise reduction inner net, the damping element group is arranged on the noise reduction net group, the elastic support component is connected the noise reduction outer net and the noise reduction inner net, solve the technical problem that existing underwater noise suppression device is difficult to be flexibly adapted to different scenes, and the noise reduction effect is poor for low-frequency noise.

Description

Technical Field

[0001] This invention relates to the field of noise reduction equipment for marine operations, and more particularly to an underwater noise suppression device for offshore wind power monopile construction. Background Technology

[0002] Underwater noise, as a new type of marine pollution source, is a common operating method in projects such as cross-sea bridges and offshore wind power. The underwater noise generated poses a threat to the survival and reproduction of marine life, such as interfering with behavior, masking acoustic communications, and even causing hearing and physical damage. In addition, it has potential adverse effects on the entire marine ecosystem, such as changing the migration patterns and habitats of organisms, thereby affecting the cascading effects of the entire food chain and leading to a decline in biodiversity.

[0003] Existing underwater pile driving noise reduction technologies mainly include bubble curtains, sound barriers, and underwater acoustic dampers. However, all three technologies have certain technical drawbacks. For example, bubble curtains have poor noise reduction effects on low-frequency noise and are easily affected by currents; sound barriers involve large-scale engineering and are costly; and the effectiveness of underwater acoustic dampers depends on the selection of damping materials and their placement structure. Currently, the types of damping element materials used in underwater acoustic dampers are limited, and the element placement methods mainly rely on experience, lacking simulation calculation analysis.

[0004] Chinese patent application number 202310761920.4 discloses a method for suppressing flow noise from an acoustic array based on an underwater unmanned platform, belonging to the field of underwater acoustic signal processing. The invention includes the following steps: calculating the wavenumber response function, calculating the random field of pressure within the casing, calculating the casing transfer function, calculating the flow noise power spectrum of a single hydrophone, calculating the flow noise power spectrum of the entire towed linear array, and canceling the flow noise from the acoustic array through adaptive filtering. This invention designs a complete processing flow by combining a flow noise response prediction algorithm with a self-noise cancellation algorithm for adaptive filtering, which can effectively cancel the flow noise from the acoustic array based on an underwater unmanned platform, improving the accuracy and efficiency of target detection. This invention can be easily applied to various unmanned underwater platforms to reduce flow noise interference from towed linear arrays. The technical solution proposed above, which calculates the noise power spectrum using an algorithm and then generates adaptive filtering for cancellation, is easily affected by seawater density, impurity content, and microbial content and concentration in practical applications, making it difficult to achieve ideal results. Physical noise isolation is more suitable for use in various environments and scenarios. Summary of the Invention

[0005] Therefore, in order to address the above problems, this invention proposes an underwater noise suppression device for offshore wind power monopile construction, which solves the technical problems that existing underwater noise suppression devices are difficult to adapt flexibly to different scenarios and have poor noise reduction effects for low-frequency noise.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: an underwater noise suppression device for offshore wind power monopile construction, comprising a submerged base, a noise reduction mesh assembly, an elastic support assembly, and a damping element assembly. The submerged base is a hollow structure. The noise reduction mesh assembly is fixedly installed on the submerged base. The noise reduction mesh assembly includes an outer noise reduction mesh and an inner noise reduction mesh. The damping element assembly is installed on the noise reduction mesh assembly. The elastic support assembly connects the outer noise reduction mesh and the inner noise reduction mesh.

[0007] The outer noise-reducing mesh is made of polyethylene with a density of 910-960 kg / m³, a mesh diameter of no more than 2.0 cm × 2.0 cm, and a thickness of no more than 1.25 mm; the inner noise-reducing mesh is made of polyethylene with a density of 925-940 kg / m³, a mesh diameter of no more than 2.2 cm × 2.2 cm, and a thickness of no more than 1.5 mm.

[0008] The damping element group includes a first damping element and a second damping element. The first damping element is disposed on the noise reduction outer net, and the second damping element is disposed on the noise reduction inner net. Both the first damping element and the second damping element are closed-cell polyethylene. The density of the first damping element is 90 kg / m³, and the density of the second damping element is 110 kg / m³.

[0009] The noise-reducing inner net is fixedly installed on the submerged base. The elastic support assembly includes a first connecting support rod and a second connecting support rod, which are rotatably connected. The first connecting support rod is rotatably connected to the noise-reducing inner net, and the second connecting support rod is rotatably connected to the noise-reducing outer net. The noise-reducing outer net is not connected to the submerged base. The noise-reducing outer net shifts with changes in water flow and underwater pressure.

[0010] Furthermore, both the first damping element and the second damping element are cylinders with a diameter of 4cm and a height of 6cm, and both are arranged in a matrix manner.

[0011] Furthermore, the noise reduction outer net includes a plurality of first support columns and a first support rope for connecting each of the first support columns, and the noise reduction inner net includes a plurality of second support columns and a second support rope for connecting each of the second support columns. The first damping element is arranged on the first support rope, and the second damping element is arranged on the second support rope. The noise reduction outer net and the noise reduction inner net are arranged in a ring.

[0012] Furthermore, a first groove is provided on the side of the first support column near the second support column, and a second groove is provided on the side of the second support column near the first support column. Both the first and second grooves are elongated grooves. A first slider is slidably disposed in the first groove, and a second slider is slidably disposed in the second groove. The first connecting support rod is rotatably connected to the noise reduction outer mesh by hinge with the first slider, and the second connecting support rod is rotatably connected to the noise reduction inner mesh by hinge with the second slider. The first connecting support rod and the second connecting support rod are hinged to each other.

[0013] Furthermore, both the first and second slide grooves are provided with push rods, which are respectively located at both ends of the first and second sliders. The push rods are elastic push rods, which generate push forces on the first and second sliders respectively after being subjected to force.

[0014] Furthermore, the first support column can move up and down vertically, and the up and down movement of each first support column is independent of each other. The first support columns are arranged in a ring, and their up and down movement is progressive between adjacent columns, maintaining an overall wave-like up and down undulation.

[0015] Furthermore, the outer circumferential surface of the first damping element is provided with a first wave-making structure, and the outer circumferential surface of the second damping element is provided with a second wave-making structure. The first wave-making structure and the second wave-making structure cooperate to disturb the water flow between the noise reduction outer net and the noise reduction inner net.

[0016] Furthermore, both the first damping element and the second damping element rotate on the first support rope and the second support rope respectively, accompanied by water flow disturbance.

[0017] Furthermore, the first wave-like structure is a first wave-like protrusion disposed on the outer circumferential surface of the first damping element, the first wave-like protrusion being spirally arranged around it; the second wave-like structure is a second wave-like protrusion disposed on the outer circumferential surface of the second damping element, the second wave-like protrusion being spirally arranged around it.

[0018] Furthermore, the first wave protrusion is inclined with its horizontal surface facing upwards, while the second wave protrusion is inclined with its horizontal surface facing downwards.

[0019] By adopting the aforementioned technical solution, the beneficial effects of the present invention are:

[0020] 1. The technical solution proposed in this invention, compared to existing underwater noise reduction nets, can concentrate underwater pile driving noise energy below 1kHz through material improvements and structural optimization. It is also less expensive and suitable for pile driving in deep water (shallower than 40m) and large-diameter pile foundations (within 8m). Even in deep water and strong tidal current environments, it maintains a stable and efficient noise reduction effect. Its adaptability to ocean currents is due to its optimized structure, specifically: by setting up a double-layer noise reduction net, with the inner and outer nets made of polyethylene materials of different densities, it can reduce noise layer by layer. Polyethylene itself is a high-performance plastic material… The noise reduction mesh exhibits outstanding advantages in applications, mainly due to its high strength, weather resistance, and acoustic processing capabilities. Among them, high-density electron-irradiated cross-linked polyethylene absorbs and scatters sound waves through its honeycomb closed-cell structure, effectively reducing high-frequency noise while being non-toxic and environmentally friendly. In this invention, noise reduction is achieved through layered noise reduction using noise reduction meshes made of polyethylene materials of different densities. Furthermore, damping elements, made of closed-cell polyethylene, are placed on the inner and outer noise reduction meshes. Through their structure, these elements can absorb the impact energy of water flow. By converting structural vibration energy into heat energy through molecular friction or hysteresis, they suppress resonance and reduce the amplitude of noise radiation.

[0021] 2. In this invention, the noise-reducing inner net is fixedly installed on the submerged base. The noise-reducing outer net and the noise-reducing inner net are movably connected by an elastic support component. During construction, piling operations are carried out on the noise-reducing inner net. The fixed connection of the noise-reducing inner net improves the stability of the noise-reducing net assembly during construction and avoids interference with piling operations due to water flow disturbance. The connection between the noise-reducing outer net and the noise-reducing inner net in this invention uses an elastic support component, which includes a first connecting support rod and a second connecting support rod that are hinged to each other. The two support rods are also rotatable, just like the noise-reducing outer net and the noise-reducing inner net. The connection method is different; the outer noise reduction net is not connected to the submerged base. It can fluctuate with the water flow. The purpose is that when the outer and inner noise reduction nets are relatively fixed, the ocean current between them is basically still due to the influence of their surroundings. Compared with the still ocean current, the flowing ocean current can absorb the vibration of noise through the impact of the water flow, thus assisting in the noise reduction operation. Therefore, when the outer noise reduction net is disturbed by the external water flow, it will accept the disturbance and fluctuate. The fluctuation further drives the water flow between the inner and outer noise reduction nets to fluctuate, thus improving the noise reduction effect.

[0022] 3. The purpose of setting the first damping element and the second damping element in this invention is to work together to improve the noise reduction effect. Closed-cell polyethylene foam material, with its unique structure and physical properties, can achieve efficient noise reduction. The honeycomb closed-cell structure consumes sound wave energy through friction damping, reduces the propagation intensity of high-frequency noise (vibration noise of pile drivers), and the sound absorption rate can reach more than 30%.

[0023] 4. In this invention, an elastic support component is used to connect the noise reduction inner net and the noise reduction outer net. The purpose is to provide the noise reduction outer net with better freedom of movement and ensure that the noise reduction outer net can follow the fluctuations of the external ocean current during use. Push rods are set in the first and second chutes, and the pushing method is elastic pushing. The purpose is to ensure that the overall structure of the noise reduction outer net can be supported during the process of being disturbed by the water flow and following the fluctuations, so as not to cause problems such as collision with the noise reduction inner net due to excessive water flow impact force.

[0024] 5. The first damping element and the second damping element in this invention are respectively provided with a first wave-deflecting structure and a second wave-deflecting structure, and the two work together. The first damping element and the second damping element themselves will rotate with the impact of the water flow. During the rotation, the first wave-deflecting structure and the second wave-deflecting structure react with the ocean current and disturb the ocean current. In this way, the ocean current between the noise reduction inner net and the noise reduction outer net can be disturbed. The turbulent and flowing ocean current can disperse and buffer the sound wave vibration generated by the pile driver. Then, the sound wave achieves the best noise reduction effect after being filtered by the noise reduction outer net.

[0025] 6. In this invention, the first wave protrusion is tilted with the horizontal surface facing upward, and the second wave protrusion is tilted with the horizontal surface facing downward. This ensures that the two do not interfere with each other during the disturbance process and each forms two currents with different directions. The currents will collide and converge, which will disperse the internal sound wave vibrations and further improve the noise reduction effect. Attached Figure Description

[0026] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0027] Figure 1 This is a schematic diagram of the noise reduction inner network structure of the present invention (with a recessed base).

[0028] Figure 2 This is a schematic diagram of the noise reduction external network structure of the present invention;

[0029] Figure 3 This is a top view of the overall structure of the present invention;

[0030] Figure 4 for Figure 3 Enlarged view of point A in the middle;

[0031] Figure 5 This is a schematic diagram of the connection structure between the first support column and the second support column in this invention;

[0032] Figure 6 This is a schematic diagram of the structure of the first damping element in this invention;

[0033] Figure 7 This is a schematic diagram of the structure of the second damping element in this invention;

[0034] Figure 8 This is a schematic diagram of the vertical lifting and unfolding of the first support column in this invention;

[0035] Figure 9 This is a top-view diagram illustrating the principle of incorporating the influence of ocean currents during the operation of this invention. Detailed Implementation

[0036] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0037] Please see Figures 1-9 This invention provides an underwater noise suppression device for offshore wind power monopile construction, comprising a submerged base 1, a noise reduction mesh assembly 2, an elastic support component 5, and a damping element assembly. The submerged base 1 is a hollow structure, defined as a ring structure with a hollow center. The noise reduction mesh assembly 2 is fixedly installed on the submerged base 1, and includes an outer noise reduction mesh 22 and an inner noise reduction mesh 21. The damping element assembly is installed on the noise reduction mesh assembly 2, and the elastic support component 5 connects the outer noise reduction mesh 22 and the inner noise reduction mesh 21.

[0038] The noise reduction outer mesh 22 is made of polyethylene with a density of 960 kg / m³, a mesh diameter of 2.0 cm × 2.0 cm, and a thickness of 1.25 mm; the noise reduction inner mesh 21 is made of polyethylene with a density of 940 kg / m³, a mesh diameter of 2.2 cm × 2.2 cm, and a thickness of 1.5 mm.

[0039] The damping element group includes a first damping element 4 and a second damping element 3. The first damping element 4 is disposed on the noise reduction outer mesh 22, and the second damping element 3 is disposed on the noise reduction inner mesh 21. Both the first damping element 4 and the second damping element 3 are closed-cell polyethylene. The density of the first damping element 4 is 90 kg / m³, and the density of the second damping element 3 is 110 kg / m³.

[0040] The noise-reducing inner net 21 is fixedly installed on the submerged base 1. The elastic support component 5 includes a first connecting support rod 51 and a second connecting support rod 52. The first connecting support rod 51 and the second connecting support rod 52 are rotatably connected. The first connecting support rod 51 is rotatably connected to the noise-reducing inner net 21, and the second connecting support rod 52 is rotatably connected to the noise-reducing outer net 22. The noise-reducing outer net 22 is not connected to the submerged base 1. The noise-reducing outer net 22 shifts with changes in water flow and underwater pressure.

[0041] Both the first damping element 4 and the second damping element 3 are cylinders with a diameter of 4cm and a height of 6cm. They are both arranged in a matrix. The noise reduction outer net 22 includes 12 first support columns 223 and a first support rope 221 for connecting each of the first support columns 223. The noise reduction inner net 21 includes 12 second support columns 213 and a second support rope 211 for connecting each of the second support columns 213. The first damping element 4 is arranged on the first support rope 221, and the second damping element 3 is arranged on the second support rope 211. The noise reduction outer net 22 and the noise reduction inner net 21 are arranged in a ring.

[0042] A first groove 222 is provided on the side of the first support column 223 near the second support column 213, and a second groove 212 is provided on the side of the second support column 213 near the first support column 223. Both the first groove 222 and the second groove 212 are elongated grooves. A first slider 7 is slidably disposed in the first groove 222, and a second slider 6 is slidably disposed in the second groove 212. The first connecting support rod 51 is rotatably connected to the noise reduction outer mesh 22 by hinge with the first slider 7, and the second connecting support rod 52 is rotatably connected to the noise reduction inner mesh 21 by hinge with the second slider 6. The first connecting support rod 51 and the second connecting support rod 52 are hinged to each other.

[0043] Both the first slide groove 222 and the second slide groove 212 are provided with push rods 8. The push rods 8 are respectively located at both ends of the first slider 7 and the second slider 6. The push rods 8 are elastic push rods, and after being subjected to force, they generate push force on the first slider 7 and the second slider 6 respectively.

[0044] The first support column 223 can move up and down in the vertical direction. The up and down movement of each first support column 223 is independent of each other. The first support columns 223 are arranged in a ring. Their up and down movement is progressive between adjacent columns, and the whole column maintains a wave-like up and down undulation.

[0045] The outer circumferential surface of the first damping element 4 is provided with a first wave-like structure 41, and the outer circumferential surface of the second damping element 3 is provided with a second wave-like structure 31. The first wave-like structure 41 and the second wave-like structure 31 cooperate to disturb the water flow between the noise reduction outer net 22 and the noise reduction inner net 21. Both the first damping element 4 and the second damping element 3 rotate on the first support rope 221 and the second support rope 211 respectively, accompanied by the water flow disturbance. The first wave-like structure 41 is a first wave-like protrusion provided on the outer circumferential surface of the first damping element 4, and the first wave-like protrusion is spirally arranged around it. The second wave-like structure 31 is a second wave-like protrusion provided on the outer circumferential surface of the second damping element 3, and the second wave-like protrusion is spirally arranged around it. The first wave-like protrusion is inclined with its horizontal surface facing upward, and the second wave-like protrusion is inclined with its horizontal surface facing downward.

[0046] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0047] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A device for suppressing underwater noise during offshore wind power single pile construction, comprising a bottom-sinking base, a noise reduction net group, an elastic support assembly, and a damping element group, characterized in that: The bottom-sinking base is a hollow structure, the noise reduction net set is fixedly arranged on the bottom-sinking base, the noise reduction net set comprises a noise reduction outer net and a noise reduction inner net, the damping element set is arranged on the noise reduction net set, and the elastic support assembly is connected with the noise reduction outer net and the noise reduction inner net. The net material of the noise reduction outer net is polyethylene, the density is 910kg / m³-960kg / m³, the mesh diameter is not greater than 2.0cm*2.0cm, and the thickness is not greater than 1.25mm; the net material of the noise reduction inner net is polyethylene, the density is 925kg / m³-940kg / m³, the mesh diameter is not greater than 2.2cm*2.2cm, and the thickness is not greater than 1.5mm; The damping element set comprises first damping elements and second damping elements, the first damping elements are arranged on the noise reduction outer net, the second damping elements are arranged on the noise reduction inner net, the first damping elements and the second damping elements are both closed-cell polyethylene, the density of the first damping elements is 90kg / m³, and the density of the second damping elements is 110kg / m³; The noise reduction inner net is fixedly arranged on the bottom-sinking base, the elastic support assembly comprises first connecting support rods and second connecting support rods, the first connecting support rods and the second connecting support rods are rotatably connected, the first connecting support rods are rotatably connected with the noise reduction inner net, the second connecting support rods are rotatably connected with the noise reduction outer net, the noise reduction outer net and the bottom-sinking base are not connected with each other, and the noise reduction outer net is offset along with the change of water flow and underwater pressure.

2. The underwater noise suppression device for offshore wind power single pile construction according to claim 1, characterized in that: The first damping elements and the second damping elements are both cylinders with a diameter of 4cm and a height of 6cm, and are arranged in a matrix mode.

3. The device according to claim 2, characterized in that: The noise reduction outer net comprises a plurality of first support columns and first support ropes for connecting the first support columns, the noise reduction inner net comprises a plurality of second support columns and second support ropes for connecting the second support columns, the first damping elements are arranged on the first support ropes, the second damping elements are arranged on the second support ropes, and the noise reduction outer net and the noise reduction inner net are annularly arranged.

4. The device according to claim 3, characterized in that: First sliding grooves are arranged on one side of the first support column close to the second support column, second sliding grooves are arranged on one side of the second support column close to the first support column, the first sliding grooves and the second sliding grooves are both long-strip-shaped sliding grooves, first sliding blocks are slidably arranged in the first sliding grooves, second sliding blocks are slidably arranged in the second sliding grooves, the first connecting support rods are rotatably connected with the noise reduction outer net by being hingedly connected with the first sliding blocks, the second connecting support rods are rotatably connected with the noise reduction inner net by being hingedly connected with the second sliding blocks, and the first connecting support rods and the second connecting support rods are hingedly connected with each other.

5. The device according to claim 4, characterized in that: Push rods are arranged in the first sliding grooves and the second sliding grooves, the push rods are arranged at two ends of the first sliding blocks and the second sliding blocks respectively, the push rods are elastically pushed, and the first sliding blocks and the second sliding blocks are respectively pushed by the push rods under stress.

6. The device according to claim 5, characterized in that: The first support columns can be lifted up and down in the vertical direction, the up and down lifting of each first support column is independent of each other, each first support column is arranged in a ring shape, and the up and down lifting mode is progressive up and down between adjacent first support columns, and the whole keeps a wave shape up and down.

7. The device according to claim 6, characterized in that: The outer circumferential surface of the first damping element is provided with a first wave structure, the outer circumferential surface of the second damping element is provided with a second wave structure, and the first wave structure and the second wave structure disturb the water flow between the noise reduction outer net and the noise reduction inner net.

8. The device according to claim 7, characterized in that: The first damping element and the second damping element are accompanied by water flow disturbance and rotate on the first support rope and the second support rope respectively.

9. The device according to claim 8, characterized in that: The first wave structure is a first wave protrusion arranged on the outer circumferential surface of the first damping element, the first wave protrusion is arranged in a spiral shape, and the second wave structure is a second wave protrusion arranged on the outer circumferential surface of the second damping element, the second wave protrusion is arranged in a spiral shape.

10. The device according to claim 9, characterized in that: The first wave protrusion is inclined upward in the horizontal plane, and the second wave protrusion is inclined downward in the horizontal plane.

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