1*626 ocean wind power platform intelligent mooring cable and manufacturing method thereof

Abstract

An intelligent mooring cable for an ocean wind power platform is mainly composed of a mooring cable body and cable connectors. The mooring cable body is formed by wrapping a medium-density polyethylene protective layer on a single-strand steel wire rope with the structure of 1 * 626, and the single-strand steel wire rope is formed by twisting a fiber bragg grating sensor for measuring stress and strain and 625 high-strength zinc-plated aluminum rare earth alloy steel wires, wherein the fiber bragg grating sensor is located in the dead center and used for measuring stress and strain. A sensor of the mooring cable body is connected with a submarine cable lead and is subjected to protective casting, and the intelligent mooring cable is manufactured after cooling. Full-time and full-domain stress-strain monitoring of the mooring cable for the ocean wind power platform can be achieved, intelligent development of the ocean engineering mooring field is promoted, the blank of the field is filled up, and the method has high application and prospects.

Description

Technical Field

[0001] The present invention relates to a mooring cable for an offshore wind power platform, and in particular to a 1×626 offshore wind power platform smart mooring cable and a manufacturing method thereof, and belongs to the field of metal product manufacturing and processing. Background Art

[0002] With the advancement of the times and the development of science and technology, the global demand for energy is also increasing day by day. As traditional energy resources are continuously exploited, they will inevitably face the challenges of energy shortage and environmental pollution in the future. To improve the current situation of increasing energy resource shortage, it is imperative to promote the development of new energy.

[0003] Wind energy resources are a renewable and clean energy source with the advantages of low pollution and low cost. In particular, offshore wind energy has the advantage of large and stable wind energy. Therefore, the development of offshore wind power technology can alleviate the current situation of increasing energy shortage and reduce pollution to the environment, which is of great significance.

[0004] Floating offshore wind turbine platforms are primarily secured in seawater by a mooring system. The mooring cables in these systems possess advantages such as a stable elastic modulus and excellent fatigue and corrosion resistance. The lifespan of the mooring cables determines the lifespan of the floating offshore wind turbine platform.

[0005] During the operation of offshore wind turbine platforms, mooring cables face severe fatigue and aging. Due to their long-term exposure to seawater and the sheathing of their surfaces, monitoring their health is challenging. Fiber optic sensing technology, a new generation of health monitoring technology, allows sensors to be embedded within mooring cables for health monitoring. This technology offers high accuracy and a long service life, significantly contributing to the healthy and stable operation of the entire floating offshore wind turbine platform. To enable health monitoring of floating offshore wind turbine platforms and promote intelligent development within the industry, a smart mooring cable was designed that monitors the internal stresses of the mooring cable at all times and across all surfaces.

[0006] Full-time, global monitoring involves pre-engraving grating points along the fiber of the Smart Cable using a laser at fixed intervals along its entire length, based on the product's application scenario and monitoring requirements. Further processing creates a fiber Bragg grating sensor. Based on the Smart Cable's usage scenario, a monitoring frequency that reflects real-time status is designed and calculated. Once programmed, the Smart Cable begins autonomous monitoring at the set frequency. The system collects data from grating points along the entire Smart Cable, analyzes it autonomously, and then self-regulates based on the analysis, achieving full-time, global online monitoring of the entire Smart Cable. Summary of the Invention

[0007] This invention addresses the technical problem of a 1×626 offshore wind power platform intelligent mooring cable, its manufacturing method, and its functional implementation, enabling full-time and global stress and strain monitoring of offshore wind power platform mooring cables. By collecting stress and strain data, the overall condition of the mooring cable can be monitored. When an abnormality occurs, the system promptly issues an alarm, enabling personnel to promptly address it, avoiding more serious safety incidents and reducing losses.

[0008] In order to solve the above problems, the present invention adopts the following technical solutions: A 1×626 smart mooring cable for an offshore wind power platform consists of a mooring cable body and a cable connector. The smart mooring cable body is a single-strand steel wire rope with a 1×626 structure and a strength of ≥1960 MPa, coated with a medium-density polyethylene protective layer. The single-strand steel wire rope is twisted from a fiber optic Bragg grating sensor for monitoring stress and strain, and 625 high-strength galvanized aluminum rare earth alloy steel wires, with the sensor located at the center of the single-strand steel wire rope. The smart mooring cable body is placed in the cable connector, the medium-density polyethylene protective layer on the surface is peeled off, and the filaments are evenly spread out. The fiber optic Bragg grating stress and strain sensor is connected to the submarine cable lead, and a protective box is used to protect the connector. The protective box, sensor, and part of the submarine cable lead are located in an anchoring area inside the cable connector, while another part of the submarine cable lead is located outside the anchoring area. The interior of the cable connector is cast with a casting material, and the protective box, sensor, and part of the submarine cable lead are all anchored in the cable connector. After cooling, the smart mooring cable is completed.

[0009] A method for manufacturing a 1×626 offshore wind power platform smart mooring cable comprises the following steps: Step 1: Wire rope twisting: One ultra-weak fiber Bragg grating sensor for measuring stress and strain is used as the central wire to produce the rope body. 625 high-strength galvanized aluminum rare earth alloy steel wires are twisted layer by layer around the central wire through wire rope twisting equipment to form a single-strand wire rope.

[0010] Step 2: Extrusion: A single steel wire rope is evenly extruded and coated with a medium-density polyethylene protective layer on its surface through an extruder to form a mooring cable body.

[0011] Step 3: Anchoring: Insert both ends of the mooring cable into the cable joints respectively, peel off the medium-density polyethylene protective layer on the surface, and spread the wires evenly; connect the internal sensor to the submarine cable lead through a welding device, and then use a protective box to protect the connector; adjust the position of the submarine cable lead so that part of the submarine cable lead is placed outside the anchoring area.

[0012] Step 4: Casting: Cast the cable joint with resin casting material, and form the smart mooring cable after cooling and solidification.

[0013] The beneficial effects of adopting the above technical solution are: The present invention can realize full-time and full-area stress and strain monitoring of mooring cables for offshore wind power platforms, conduct safety monitoring and evaluation of the long-term operation of offshore wind power platforms, and improve the service life and safe operation of the entire offshore wind power platform. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic cross-sectional diagram of the smart mooring cable structure of the offshore wind power platform.

[0015] Figure 2 Schematic diagram of the smart mooring cable anchoring of the offshore wind power platform.

[0016] Figure 3 Schematic diagram of the overall structure of the smart mooring cable of the offshore wind power platform.

[0017] Figure 4 for Figure 1 Schematic diagram of the fiber Bragg grating sensor structure.

[0018] In the figure: 1-fiber Bragg grating sensor, 2-high-strength zinc-aluminum rare earth alloy coated steel wire, 3-medium-density polyethylene protective layer, 4-single-strand steel wire rope, 5-mooring cable body, 6-rope joint, 7-casting material, 8-submarine cable lead, 9-protection box, 1-1 sensing bare optical fiber, 1-2 sensing bare optical fiber protective coating, 1-3 carbon fiber protective layer, 1-4 glass fiber protective layer. DETAILED DESCRIPTION

[0019] In order to make the objectives, technical solutions and advantages of the present invention more clear, the present invention will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0020] The smart mooring cable of the present invention is composed of a mooring cable body 5 and a cable joint 6; the mooring cable body 5 is made of a single-strand steel wire rope 4 with a structure of 1×626 and a strength of ≥1960MPa, coated with a medium-density polyethylene protective layer 3; the single-strand steel wire rope 4 is twisted with a fiber grating sensor 1 for measuring stress and strain and 625 high-strength galvanized aluminum rare earth alloy steel wires 2, and the sensor 1 is located at the center of the single-strand steel wire rope 4; the mooring cable body 5 is placed in the cable joint 6, and the surface of the middle A high-density polyethylene protective layer 3 is formed, and the filaments are evenly spread out; the fiber optic Bragg grating sensor 1 is connected to the submarine cable lead 8, and a protective box 9 is used to protect the connector; the protective box 9, the sensor 1 and part of the submarine cable lead 8 are located in the anchoring area inside the cable joint 6, and the other part of the submarine cable lead 8 is located outside the anchoring area; the cable joint 6 is cast with a casting material 7, and the protective box 9, the sensor 1 and part of the submarine cable lead 8 are all anchored in the cable joint 6. After cooling, a smart mooring cable is made.

[0021] The ultra-weak fiber Bragg grating sensor 1 for measuring stress and strain is composed from the inside out of a bare optical fiber 1-1 for measuring stress and strain, a layer of bare optical fiber protective coating 1-2, a layer of carbon fiber protective layer 1-3, and a layer of glass fiber protective layer 1-4; A grating is set every 1m along the entire length of the bare sensing fiber 1-1; The sensing bare optical fiber protective coating 1-2 is a high temperature resistant plastic coating; The carbon fiber protective layer 1-3 is a coating layer formed by mixing carbon fiber filaments and rubber; The glass fiber protective layers 1-4 are coating layers formed by mixing glass fiber filaments and plastic; The protective box 9 is a rigid cylindrical box; The submarine cable lead 8 is a single-core submarine cable, mainly made of optical fiber, steel wire and plastic; The casting material 7 is resin.

[0022] A method for manufacturing a 1×626 offshore wind power platform smart mooring cable comprises the following steps: Step 1, wire rope twisting: use one ultra-weak fiber Bragg grating sensor 1 for measuring stress and strain as the central wire to produce the rope body, and 625 high-strength galvanized aluminum rare earth alloy steel wires 2 are twisted layer by layer around the central wire through a wire rope twisting device to form a single-strand wire rope 4.

[0023] Step 2: Extrusion: A single steel wire rope 4 is uniformly extruded and coated with a medium-density polyethylene protective layer 3 on its surface through an extruder to form a mooring cable body 5.

[0024] Step 3: Anchoring: Insert both ends of the mooring cable body 5 into the cable joints 6 respectively, peel off the medium-density polyethylene protective layer 3 on the surface, and evenly spread the threads; connect the internal sensor 1 to the submarine cable lead 8 through a welding device, and then use a protective box 9 to protect the connector; adjust the position of the submarine cable lead 8 so that a part of the submarine cable lead 8 is placed outside the anchoring area.

[0025] Step 4: Casting: Cast the cable joint 6 with the resin casting material 7, and form the smart mooring cable after cooling and solidification.

Claims

1. A 1×626 offshore wind power platform intelligent mooring cable, characterized by: It consists of two parts: a mooring cable body (5) and a cable joint (6); The mooring cable body (5) is made of a single-strand steel wire rope (4) with a structure of 1×626 and a strength of ≥1960 MPa, coated with a medium-density polyethylene protective layer (3); The single-strand steel wire rope (4) is formed by twisting a fiber optic Bragg grating stress and strain sensor (1) with 625 high-strength galvanized aluminum rare earth alloy steel wires (2), and the sensor (1) is located at the center of the single-strand steel wire rope (4); The mooring cable body (5) is placed in the cable joint (6), the medium-density polyethylene protective layer (3) on its surface is peeled off, and the filaments are evenly spread out; The fiber Bragg grating stress and strain sensor (1) is connected to the submarine cable lead (8), and a protection box (9) is used to protect the connector; The protection box (9), the sensor (1) and part of the submarine cable lead (8) are located in the anchoring area inside the cable joint (6), and the other part of the submarine cable lead (8) is located outside the anchoring area; The cable joint (6) is cast with a casting material (7) to anchor the protective box (9), the sensor (1) and part of the submarine cable lead (8) in the cable joint (6). After cooling, the intelligent mooring cable is manufactured.

2. The 1×626 offshore wind power platform smart mooring cable according to claim 1 is characterized in that: The stress and strain ultra-weak fiber Bragg grating sensor (1) is composed from the inside out of a stress and strain sensing bare optical fiber (1-1), a layer of sensing bare optical fiber protective coating (1-2), a layer of carbon fiber protective layer (1-3), and a layer of glass fiber protective layer (1-4).

3. The 1×626 offshore wind power platform smart mooring cable according to claim 2 is characterized by: A grating is provided every 1 m along the entire length of the bare sensing optical fiber (1-1).

4. The 1×626 offshore wind power platform smart mooring cable according to claim 2 is characterized by: The sensing bare optical fiber protective coating (1-2) is a high-temperature resistant plastic coating.

5. The 1×626 offshore wind power platform smart mooring cable according to claim 2 is characterized by: The carbon fiber protective layer (1-3) is a coating layer formed by mixing carbon fiber filaments and rubber.

6. The 1×626 offshore wind power platform smart mooring cable according to claim 2 is characterized by: The glass fiber protective layer (1-4) is a coating layer formed by mixing glass fiber filaments and plastic.

7. The 1×626 offshore wind power platform smart mooring cable according to claim 1 is characterized by: The protection box (9) is a rigid cylindrical box.

8. The 1×626 offshore wind power platform smart mooring cable according to claim 1 is characterized by: The submarine cable lead (8) is a single-core submarine cable, which is mainly made of optical fiber, steel wire and plastic.

9. The 1×626 offshore wind power platform smart mooring cable according to claim 2 is characterized by: The casting material (7) is resin.

10. The method for manufacturing a 1×626 offshore wind power platform smart mooring cable according to claim 1, characterized in that: It includes the following implementation steps: Step 1, wire rope twisting: using one ultra-weak fiber Bragg grating sensor (1) for measuring stress and strain as the center wire to produce a single-strand wire rope (4), and twisting 625 high-strength galvanized aluminum rare earth alloy steel wires (2) layer by layer around the center wire through a wire rope twisting device to produce a single-strand wire rope (4); Step 2: Extrusion: a single steel wire rope (4) is uniformly extruded and coated with a medium-density polyethylene protective layer (3) on its surface through an extruder to form a mooring cable body (5); Step 3, anchoring: insert the two ends of the mooring cable body (5) into the cable connector (6) respectively, peel off the medium-density polyethylene protective layer (3) on its surface, and evenly spread the filaments; connect the internal fiber grating sensor (1) to the submarine cable lead (8) through a fusion splicing device, and then use a protective box (9) to protect the connector; adjust the position of the submarine cable lead (8) so that a part of the submarine cable lead (8) is placed outside the anchoring area; Step 4: Casting: Cast the resin casting material (7) on the cable joint (6), and form the smart mooring cable after cooling and solidification.

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