A new bionic anti-icing chock for semi-submersible floating wind turbine foundation structure

Abstract

The application belongs to the technical field of ocean engineering equipment, and discloses a novel bionic ice-resistant and wave-damping device for a semi-submersible floating wind turbine foundation structure. The novel and excellent ice-resistant and wave-damping device is designed based on the bionic concept and energy consumption principle. The device comprises a semi-submersible floating foundation structure steel pile, a monitoring control system, a hydraulic drive system and a bionic ice-resistant and wave-damping structure system. In the ice season, the upper conical surface of the bionic ice-resistant and wave-damping structure system is in contact with sea ice, and the bending damage of the sea ice is induced, and the heat energy generated by the friction and resistance reduction effect helps to resist ice. In the ice-free period, the vertical concave-convex surface of the bionic ice-resistant structure is in contact with waves, and wave damping is performed. The natural vibration frequency of the offshore wind turbine can be adjusted to prevent resonance damage. In summary, the application is suitable for the wind power plant area in the high-latitude sea area of China, and provides reliable technical support for the ice-resistant and wave-damping of the semi-submersible floating wind turbine, and realizes the safe and stable maintenance of the semi-submersible floating wind turbine foundation in all climates.

Description

Technical Field

[0001] This invention relates to the field of marine engineering equipment technology, and in particular to a novel biomimetic anti-icing and wave-damping device for a semi-submersible floating wind turbine foundation structure. Background Technology

[0002] With onshore energy resources becoming increasingly depleted, shifting from land-based energy to the vast ocean energy resources, and vigorously developing offshore wind power as a clean energy source, is an effective way to achieve the goal of "carbon peaking and carbon neutrality." In the global new energy system, offshore wind power technology has gradually become a research focus. Currently, offshore wind turbines are gradually moving from fixed structures in near-shore and shallow waters to floating structures in deep waters. There are many types of floating wind turbine foundation structures, among which semi-submersible floating wind turbine foundations are widely used in global offshore floating wind farms due to their good stability and mobility, and convenient installation.

[0003] my country's high-latitude sea areas (such as the sea areas near Tianjin and Liaoning) have a high density of wind energy reserves, but varying degrees of icing occur during the cold winter months. Sea ice poses a serious threat to the operation and safety of offshore wind turbines, especially the foundation structures of semi-submersible to floating wind turbines. The impact of sea ice needs to be carefully considered. If one of the support columns is damaged, it can lead to the tilting or even failure of the entire structure. Moreover, the superstructure will also experience strong vibrations. All of these factors will seriously affect the stability of the offshore floating wind turbine structure and the safe operation of the wind turbine unit. Furthermore, the environment in which deep-sea floating wind turbines operate is even harsher, with complex and variable wave conditions. Traditional anti-icing cones and other protective measures lack wave-damping capabilities; in fact, the increased contact area can amplify the impact of waves on the superstructure. Examples include adjustable anti-icing cone structures for marine structure pile foundations (application number CN202120559102.2), detachable anti-icing devices for offshore nuclear power platforms (application number CN201410549262.3), anti-icing cone devices and offshore wind turbine generators (application number CN201711418762.3), and an anti-icing device for jack-up offshore platforms (application number CN201710378804.9). Therefore, when applying semi-submersible floating wind turbines to wind farm areas where sea ice occurs, the optimized design of their foundation structure for ice and wave damping is particularly crucial and is a core issue that urgently needs to be addressed by those skilled in the art. Summary of the Invention

[0004] The purpose of this invention is to provide a novel biomimetic anti-icing and wave-damping device for semi-submersible floating wind turbine foundations, designed to effectively mitigate the damage caused by ice-induced vibrations to the wind turbine foundation structure. This invention is of great significance for both improving the stability of semi-submersible floating wind turbine foundations and the reliability of wind turbine grid-connected operation.

[0005] To achieve the above objectives, the technical solution of the present invention is as follows: A novel biomimetic anti-icing and wave-damping device for a semi-submersible floating wind turbine foundation structure includes a semi-submersible floating foundation steel pile 1, a monitoring and control system, a hydraulic drive system 3, and a biomimetic anti-icing and wave-damping structure system 4; the hydraulic drive system 3 is installed on the side of the semi-submersible floating foundation steel pile 1; the biomimetic anti-icing and wave-damping structure system 4 is fitted onto the outside of the semi-submersible floating foundation steel pile 1 and connected to the hydraulic drive system 3 for vertical movement; the monitoring and control system is installed on the semi-submersible floating foundation steel pile 1 and the wind turbine tower, and connected to... The system is connected to a hydraulic drive system 3; the biomimetic anti-icing and wave-damping structure system 4 is a honeycomb-shaped biomimetic structure, which includes three honeycomb-shaped steel column groups 41 and a damping fluid 45; the honeycomb-shaped steel column groups 41 are connected to the hydraulic drive system 3 through rubber damping 42; the honeycomb-shaped steel column groups 41 are a closed structure, including multiple closed steel columns; each steel column is filled with damping fluid 45 and completely sealed; the inner surface of the honeycomb-shaped steel column groups 41 is painted to increase the frictional resistance between the damping fluid 45 and the surface of the honeycomb-shaped steel column groups 41; the heat generated by friction helps to melt the surrounding sea ice.

[0006] The biomimetic anti-icing and wave-damping structure system 4 is divided into an upper conical surface, a vertical surface, and a lower conical surface from top to bottom; the vertical surface is a concave-convex surface.

[0007] The cone angle of the upper cone surface is 30 degrees.

[0008] The monitoring and control system includes a laser vibration meter 21, an acceleration sensor 22, and a controller 23. The laser vibration meter 21 is placed on top of the steel piles 1 of the semi-submersible floating foundation structure and is used to measure the movement speed, displacement, and acceleration of sea ice. The acceleration sensor 22 is installed on the wind turbine tower to measure the vibration frequency of the wind turbine. The measurement data of the laser vibration meter 21 and the acceleration sensor 22 are transmitted to the controller 23. The controller 23 is connected to the hydraulic drive system 3 to adjust the height of the biomimetic anti-icing and wave-damping structure system 4. During the peak ice season, the hydraulic drive system 3 adjusts the upper conical surface of the biomimetic anti-icing and wave-damping structure system 4 to contact the sea ice, causing the sea ice to bend and break. During the ice-free season, the hydraulic drive system 3 adjusts the vertical surface of the biomimetic anti-icing and wave-damping structure system 4 to contact the waves, and the concave and convex surfaces of the honeycomb structure outer surface of the biomimetic anti-icing and wave-damping structure system 4 dampen the waves.

[0009] The beneficial effects of this invention: The novel biomimetic anti-icing and wave-damping device for semi-submersible floating wind turbine foundations of this invention is suitable for deep-sea floating wind turbine foundations in high-latitude regions with high anti-icing requirements. Designed using biomimetic concepts and energy-dissipating principles, the novel anti-icing structure effectively suppresses ice-induced vibrations and improves the safety and stability of offshore wind turbines. This invention is of great significance for both improving the stability of semi-submersible floating wind turbine foundations and the reliability of wind turbine grid-connected operation. Attached Figure Description

[0010] Figure 1 This is a structural schematic diagram of a novel biomimetic anti-icing and wave-damping device for a semi-submersible floating wind turbine foundation.

[0011] Figure 2 This is a schematic diagram of the layout of the monitoring and control system of the present invention;

[0012] Figure 3 This is a schematic diagram of the hydraulic drive system of the present invention;

[0013] Figure 4 The following is a schematic diagram of the biomimetic anti-icing system of the novel biomimetic anti-icing and wave-damping structure for the semi-submersible floating wind turbine foundation of the present invention: (a) is a schematic diagram of the biomimetic anti-icing and wave-damping structure system; (b) is a schematic diagram of the honeycomb steel column group; and (c) is a schematic diagram of the damping fluid.

[0014] Figure 5 This is a top view of the planar arrangement of the device of the present invention;

[0015] Figure 6 This is a top view of the schematic diagram of the device of the present invention;

[0016] Figure 7 This is a flowchart illustrating the monitoring and control system of the device of the present invention.

[0017] Figure 8 This is a rendering of a novel biomimetic anti-icing and wave-damping structure for a semi-submersible floating wind turbine foundation.

[0018] In the diagram: 1 is the semi-submersible floating foundation steel pile; 3 is the hydraulic drive system; 4 is the biomimetic anti-icing and wave-damping structure system; 21 is the laser vibration meter; 22 is the acceleration sensor; 23 is the controller; 31 is the hydraulic actuator; 32 is the pulley track; 33 is the universal pulley; 34 is the connecting circular plate; 41 is the honeycomb steel column group; 42 is the rubber damper; 43 is the bolt; 44 is the sealing ring; 45 is the damping fluid; 46 is the group connecting bolt. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] During the peak ice-covered winter season, the upper conical surface of the high-strength, rigid biomimetic anti-icing and wave-damping device can be automatically adjusted to be level with the ice surface according to the evolution of ice conditions, inducing bending damage to the sea ice. The honeycomb structure is filled with high-damping fluid, resulting in excellent vibration reduction. The heat energy generated by the frictional energy dissipation design can mitigate the compression damage to the offshore wind turbine foundation structure caused by sea ice. Based on the Frequency Design Principles (TFLS), the height of the anti-icing structure device is automatically adjusted to help keep the wind turbine's natural frequency between the 1P and 3P frequency bands, thus preventing resonance damage and reducing the probability of structural failure or reduced fatigue life. During ice-free periods, the vertical surface of the biomimetic anti-icing and wave-damping structure system is adjusted to contact the waves for wave damping, thereby maintaining the safety and stability of the semi-submersible floating wind turbine foundation under all weather conditions.

[0021] A novel biomimetic anti-icing and wave-damping device for a semi-submersible floating wind turbine foundation structure includes a semi-submersible floating foundation steel pile 1, a monitoring and control system, a hydraulic drive system 3, and a biomimetic anti-icing and wave-damping structure system 4.

[0022] Preferably, the semi-submersible floating foundation steel pile 1 is made of special steel with good corrosion resistance;

[0023] Preferably, the monitoring and control system includes a laser vibration meter 21, which is placed on top of the steel piles 1 of the semi-submersible floating foundation structure. This meter can non-contactly measure the movement speed, displacement, and acceleration of the surrounding sea ice. An acceleration sensor 22 is also included, capable of measuring the vibration frequency of the wind turbine. The measured data is transmitted to a controller 23. After a preset program, commands are applied to the controller of the hydraulic drive system 3 to flexibly adjust the height of the biomimetic anti-icing and wave-damping structure system 4, preventing resonance in the wind turbine and thus preventing structural failure or reduced fatigue life. During periods of high ice cover, the controller of the hydraulic drive system 3 adjusts the upper conical surface of the biomimetic anti-icing and wave-damping structure system 4 to contact the sea ice, inducing bending and damage. During ice-free periods, the vertical surface of the biomimetic anti-icing and wave-damping structure system 4, i.e., the "concave-convex" surface, is adjusted to contact the waves for wave damping, thereby maintaining the safety and stability of the semi-submersible floating wind turbine foundation under all weather conditions.

[0024] Preferably, the hydraulic drive system 3 is used to provide power to adjust the height of the bionic anti-icing and wave-damping structure system 4. The semi-submersible floating foundation steel pile 1 is equipped with a pulley track 32, and the bionic anti-icing and wave-damping structure is equipped with a fixed universal pulley 33, which has a locking function.

[0025] Preferably, the biomimetic anti-icing and wave-damping structure system 4 is a honeycomb structure made of special steel, which is prefabricated and has advantages such as high strength, high rigidity, impact resistance, and good vibration reduction performance. The honeycomb structure is filled with a high-damping fluid and completely sealed. The inner surface of the honeycomb structure is painted to increase the friction-reducing effect between the high-damping fluid and the steel surface. In addition, the heat energy generated by the friction-reducing effect is collected by an integrated heat collection tube device and concentrated on the outermost side to assist in melting the surrounding sea ice.

[0026] refer to Figures 1 to 7 , Figure 1 A schematic diagram of a novel biomimetic anti-icing and wave-damping structure for a semi-submersible floating wind turbine foundation. Figure 2 A schematic diagram of the layout of the monitoring and control system for a novel biomimetic anti-icing and wave-damping structure for a semi-submersible floating wind turbine foundation. Figure 3 A schematic diagram of the hydraulic drive system for a novel biomimetic anti-icing and wave-damping structure for a semi-submersible floating wind turbine foundation. Figure 4 A schematic diagram of a novel biomimetic anti-icing and wave-damping structure for a semi-submersible floating wind turbine foundation; Figure 5 This is a top view of the planar arrangement of the device of the present invention; Figure 6 This is a top view of a schematic diagram of the device of the present invention; Figure 7 This is a flowchart illustrating the monitoring and control system of the device of the present invention.

[0027] This invention provides a novel biomimetic anti-icing and wave-damping device for semi-submersible floating wind turbine foundations. It is used in offshore wind turbine foundation structures and includes a semi-submersible floating foundation steel pile 1, a monitoring and control system, a hydraulic drive system 3, and a biomimetic anti-icing and wave-damping structure system 4. A laser vibration meter 21, an acceleration sensor 22, and a controller 23 together form the monitoring and control system. Its main function is to intelligently adjust the position of the biomimetic anti-icing and wave-damping structure system 4 in conjunction with the hydraulic drive system 3 according to seasonal changes in ice conditions or tidal range. During periods of high ice cover, the hydraulic drive controller adjusts the upper conical surface of the biomimetic anti-icing and wave-damping structure to contact the sea ice, inducing the sea ice to bend and break. During ice-free periods, it adjusts the vertical surface of the biomimetic anti-icing and wave-damping structure to contact the sea waves, using special steel... The honeycomb-like structure with its uneven surface helps to dampen waves, thus stabilizing the semi-submersible floating wind turbine foundation under all weather conditions. Furthermore, the natural frequency of the offshore wind turbine can be adjusted by changing the positions of the three biomimetic anti-icing wave-damping structure systems 4, preventing resonance damage and reducing the probability of structural failure or reduced fatigue life. The hydraulic drive system 3, composed of a hydraulic actuator 31, pulley rails 32, universal pulleys 33, and connecting circular plates 34, primarily provides power for adjusting the position of the biomimetic anti-icing wave-damping structure systems 4. The biomimetic anti-icing wave-damping structure system 4 consists of a honeycomb-shaped steel column group 41, specially designed rubber dampers (with pre-drilled bolt holes) 42, bolts 43, sealing rings 44, high-damping fluid 45, and group connecting bolts 46. Its main function is to reduce vibration in the offshore wind turbine. The structure has advantages such as high strength, high rigidity, impact resistance, and excellent vibration damping performance. The structure is completely sealed and filled with a highly damped fluid. The inner surface of each hexagonal steel member is painted to increase the frictional resistance between the damping fluid and the inner surface of the steel. During periods of high ice cover, this frictional resistance generates considerable heat energy that can effectively melt the sea ice surrounding the ice-resistant structure.

[0028] Specifically, the laser vibration meter 21 is first installed on top of the steel pile 1 of the semi-submersible floating foundation structure. It can non-contactly measure the vibration frequency of the surrounding sea ice. An acceleration sensor is installed on the offshore wind turbine to measure its own vibration frequency. The signals from both are transmitted to the semi-centralized controller 23. The controller 23 compares the vibration frequencies of the two through a pre-programmed procedure. If there is a possibility of resonance damage, the biomimetic anti-icing and wave-damping structure system 4 is adjusted through the hydraulic drive system 3 to change the natural frequency of the offshore wind turbine and thus prevent resonance damage.

[0029] Specifically, the hydraulic actuator 31 is connected to the connecting circular plate 34 via bolts and a universal pulley (with locking function) 33, and the pulley track 32 is connected to the semi-submersible floating foundation steel pile 1 via matching bolts.

[0030] Specifically, each honeycomb steel column group 41 is prefabricated in the factory by welding each honeycomb steel column, ensuring complete sealing and simultaneously injecting a special high-damping fluid 45. Its inner surface is then painted to increase the friction and resistance reduction effect between the damping fluid and the inner surface of the steel. A special rubber damper (with pre-drilled bolt holes) 42 connects each honeycomb steel column group 41 to the connecting circular plate 34 via bolts 43 and sealing rings 45, thereby connecting it to the semi-submersible floating foundation structure steel pile 1. Furthermore, each honeycomb steel column group 41 is connected by group connecting bolts... The 46 bolts are connected to form a novel biomimetic anti-icing and wave-damping device with a good overall structure. Its main function is to reduce vibration of offshore wind turbines. During the high ice season, the hydraulic drive controller adjusts the upper conical surface of the biomimetic anti-icing and wave-damping structure to contact the sea ice, inducing the sea ice to bend and break. During the ice-free season, the vertical surface of the biomimetic anti-icing and wave-damping structure is adjusted to contact the waves. Waves are damped by the "concave and convex" surface of the honeycomb structure made of special steel, thereby maintaining the safety and stability of the semi-submersible floating wind turbine foundation under all climatic conditions.

[0031] Specifically, after all the devices are installed, the monitoring system 2, hydraulic drive system 3, and biomimetic anti-icing and wave-damping structure system 4 are debugged, and the sealing performance of each honeycomb steel column group 41 is tested. If there are no problems, it can be put into use.

[0032] This novel biomimetic anti-icing and wave-damping device for semi-submersible floating wind turbine foundations can be applied not only to semi-submersible floating wind turbine foundations, but also to other offshore wind turbine foundations, such as monopile foundations, tripod foundations, and jacket foundations.

[0033] The device of this invention is of certain significance for ice prevention and wave dissipation in sea ice disaster areas. The novel anti-ice and wave dissipation structure device is designed based on biomimetic concepts and energy consumption principles. It can effectively suppress ice-induced vibration and weaken wave action, improve the safety and stability of offshore wind turbines, and the heat energy it dissipates can help melt sea ice.

[0034] In summary, this invention patent presents a novel anti-icing and wave-damping structure designed using biomimetic concepts and energy-dissipating principles. It can maintain the safety and stability of semi-submersible floating wind turbine foundations under all weather conditions. Specifically, during periods of high ice cover, it induces bending and breakage of sea ice to achieve ice resistance; during ice-free periods, the "concave-convex" surface of the structure's outer surface provides wave damping, effectively suppressing ice-induced vibrations and weakening wave effects, thus improving the safety and stability of offshore wind turbines. Overall, this invention patent is of great significance for both improving the stability of semi-submersible floating wind turbine foundation structures and the reliability of wind turbine grid-connected operation.

[0035] Although preferred embodiments of the present invention have been described above in conjunction with the accompanying drawings, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art, under the guidance of the present invention, can make many other modifications without departing from the spirit and scope of the claims, and all of these modifications fall within the scope of the claims of the present invention.

Claims

1. A novel biomimetic anti-icing and wave-damping device for a semi-submersible floating wind turbine foundation structure, characterized in that, The novel biomimetic anti-icing and wave-damping device for the semi-submersible floating wind turbine foundation structure includes a semi-submersible floating foundation steel pile (1), a monitoring and control system, a hydraulic drive system (3), and a biomimetic anti-icing and wave-damping structure system (4); the hydraulic drive system (3) is installed on the side of the semi-submersible floating foundation steel pile (1); the biomimetic anti-icing and wave-damping structure system (4) is fitted onto the outside of the semi-submersible floating foundation steel pile (1) and connected to the hydraulic drive system (3) for vertical movement; the monitoring and control system is installed on the semi-submersible floating foundation steel pile (1) and the wind turbine tower and connected to the hydraulic drive system (3); The biomimetic anti-icing and wave-damping structure system (4) is a honeycomb-shaped biomimetic structure, which includes three honeycomb-shaped steel column groups (41) and a damping fluid (45); the honeycomb-shaped steel column groups (41) are connected to the hydraulic drive system (3) through rubber damping (42); the honeycomb-shaped steel column groups (41) are a closed structure, including multiple closed steel columns; each steel column is filled with damping fluid (45) and completely sealed; the inner surface of the honeycomb-shaped steel column groups (41) is painted to increase the friction and resistance reduction effect between the damping fluid (45) and the surface of the honeycomb-shaped steel column groups (41); the heat generated by friction helps to melt the surrounding sea ice; The biomimetic anti-icing and wave-damping structure system (4) is divided into an upper conical surface, a vertical surface, and a lower conical surface from top to bottom; the vertical surface is a concave-convex surface; The monitoring and control system includes a laser vibration meter (21), an acceleration sensor (22), and a controller (23). The laser vibration meter (21) is placed on top of the semi-submersible floating foundation steel pile (1) to measure the speed, displacement, and acceleration of sea ice. The acceleration sensor (22) is installed on the wind turbine tower to measure the vibration frequency of the wind turbine. The measurement data of the laser vibration meter (21) and the acceleration sensor (22) are transmitted to the controller (23). The controller (23) is connected to the hydraulic drive system (3) to adjust the height of the bionic anti-ice wave-damping structure system (4). During the peak ice season, the hydraulic drive system (3) adjusts the upper conical surface of the bionic anti-ice wave-damping structure system (4) to contact the sea ice, causing the sea ice to bend and break. During the ice-free season, the hydraulic drive system (3) adjusts the vertical surface of the bionic anti-ice wave-damping structure system (4) to contact the waves, using the concave and convex surfaces of the honeycomb structure outer surface of the bionic anti-ice wave-damping structure system (4) to dampen the waves.

2. The novel biomimetic anti-icing and wave-damping device for semi-submersible floating wind turbine foundation structure according to claim 1, characterized in that, The cone angle of the upper cone surface is 30 degrees.

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