A design method and system of a dual shared mooring system and a dual shared mooring system

Abstract

The present application belongs to the technical field of mooring system, and provides a design method and system of a double-shared mooring system and the double-shared mooring system, comprising: for the shared mooring line, the horizontal distance and the vertical distance between the two end points of the shared mooring line are obtained, and the tension component of the shared mooring line at the fairlead is calculated; for the anchor line, based on the tension component of the shared mooring line at the fairlead, the distance between the contact point of the anchor line and the seabed and the anchor point is obtained through iterative solution; for the anchor, the tension of the end of the anchor line connected to the anchor is obtained, and the anchor parameter is calculated; wherein the shared mooring line is arranged between two floating structures, each floating structure is provided with a plurality of anchor lines, and the anchor lines of the two floating structures without the shared mooring line share the anchor point. The mooring line cost, the anchor cost, the seabed rock and soil site survey cost and the installation cost can be effectively reduced, the installation steps are reduced, the operation risk is reduced, and the utilization efficiency of the mooring system is greatly improved.

Description

Technical Field

[0001] This invention belongs to the field of mooring system technology, and particularly relates to a design method, system, and dual-shared mooring system. Background Technology

[0002] The statements in this section are merely background information related to the present invention and do not necessarily constitute prior art.

[0003] Offshore areas possess abundant wind energy resources, and floating offshore wind turbines (FOWTs) are suitable for developing these rich wind resources in deep-sea areas. Simultaneously, offshore solar energy resources are also plentiful, and floating offshore photovoltaic systems can fully utilize these resources without being limited by spatial constraints. Overall, the development of offshore wind power and offshore photovoltaics towards deeper and more distant waters is an inevitable trend.

[0004] Currently, cost is a major constraint on the development of floating structures such as floating wind turbines. To limit the movement of floating structures within permissible limits, they need to be moored and secured. Mooring system components include mooring lines (materials such as anchor chains, steel cables, and polyester fibers) and anchors located on the seabed. As the water depth increases, the required length of the mooring lines increases significantly, leading to a corresponding increase in material costs. This also increases costs related to anchor materials, surveying, and installation. Furthermore, installing seabed anchors is difficult and carries high construction risks. These factors diminish the cost and installation advantages of offshore floating wind turbines and floating photovoltaic systems, limiting the large-scale commercialization of renewable energy sources such as wind and solar power in deep waters. Summary of the Invention

[0005] To address the technical problems existing in the background art, the present invention provides a design method, system, and dual-shared mooring system, which can effectively reduce mooring line costs, anchor costs, seabed rock and soil on-site investigation costs, and installation costs, reduce installation steps and thus reduce operational risks, and significantly improve the utilization efficiency of the mooring system.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] The first aspect of the present invention provides a design method for a dual-shared mooring system.

[0008] A design method for a dual-shared mooring system includes:

[0009] For a shared mooring line, the horizontal and vertical distances between the two endpoints of the shared mooring line are obtained, and the tension component of the shared mooring line at the guide hole is calculated using the nonlinear elastic catenary equation of the shared mooring line.

[0010] For the anchor line, based on the tension component of the shared mooring line at the guide hole, the distance between the contact point between the anchor line and the seabed and the anchor point is obtained by iteratively solving the two-segment ordinary mooring line catenary equation.

[0011] For the anchor, obtain the tension at the end of the anchor line connected to the anchor, calculate the net load on the anchor point, and calculate the anchor parameters based on the net load on the anchor point.

[0012] The shared mooring line is set between two floating structures, each of which has multiple anchor lines, and the anchor lines of the two floating structures do not share anchor points.

[0013] Furthermore, the specific steps of the iterative solution include:

[0014] The distance between the contact point between the anchor line and the seabed and the anchor point is initially set. By solving the two-segment catenary equation of a normal mooring line, the tension component of the anchor line at the guide hole is obtained and compared with the tension component of the shared mooring line at the guide hole.

[0015] If the tension components of the anchor line and the shared line at the guide hole are not equal, update the distance between the anchor line's contact point with the seabed and the anchor point until the tension components of the anchor line and the shared line at the guide hole are equal.

[0016] Furthermore, the nonlinear elastic catenary equation of the shared mooring line is constructed based on Hooke's law, Newton's first law, and the principle of conservation of mass.

[0017] Furthermore, the two floating structures, a shared mooring line between the two floating structures, four anchor points, and four anchor lines connecting the anchors to the floating structures constitute a cell.

[0018] Furthermore, the four adjacent cell bodies share anchor points with each other.

[0019] Furthermore, the anchor line is arranged symmetrically about the shared mooring line.

[0020] A second aspect of the present invention provides a design system for a dual-shared mooring system.

[0021] A design system for a dual-shared mooring system includes:

[0022] The data acquisition module is configured to: for a shared mooring line, acquire the horizontal and vertical distances between the two endpoints of the shared mooring line, and calculate the tension component of the shared mooring line at the guide hole using the nonlinear elastic catenary equation of the shared mooring line;

[0023] Anchor line design module, which is configured to: for anchor line, based on the tension component of the shared mooring line at the guide hole, obtain the distance between the contact point of the anchor line and the seabed and the anchor point by iteratively solving the two-segment ordinary mooring line catenary equation;

[0024] Anchor design module, configured to: for anchor, obtain the tension at the end of the anchor line connected to the anchor, calculate the net load on the anchor point, and calculate the anchor parameters based on the net load on the anchor point;

[0025] The shared mooring line is set between two floating structures, each of which has multiple anchor lines, and the anchor lines of the two floating structures do not share anchor points.

[0026] A third aspect of the present invention provides a computer-readable storage medium.

[0027] A computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps in the design method of a dual-shared mooring system as described in the first aspect above.

[0028] A fourth aspect of the present invention provides a computer device.

[0029] A computer device includes a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor, when executing the program, implements the steps in a design method for a dual-shared mooring system as described in the first aspect above.

[0030] A fifth aspect of the present invention provides a dual-shared mooring system.

[0031] A dual-shared mooring system includes: multiple anchors, a shared mooring line disposed between two floating structures, and multiple anchor lines connecting the anchors and the floating structures, wherein the anchor lines of the two floating structures that do not share a shared mooring line share an anchor point;

[0032] The anchor parameters and the distance between the anchor line's contact point with the seabed and the anchor point are designed using a dual-shared mooring system design method as described in the first aspect.

[0033] Compared with the prior art, the beneficial effects of the present invention are:

[0034] This invention can effectively reduce the costs of mooring lines, anchors, on-site investigation of seabed rock and soil, and installation. It reduces installation steps and thus reduces operational risks, significantly improves the utilization efficiency of mooring systems, promotes the large-scale and commercialization of offshore floating wind farms and photovoltaic power plants, and enhances technological competitiveness in the field of deep-sea floating wind turbines. Attached Figure Description

[0035] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0036] Figure 1 This is a schematic diagram of an intracellular floating structure sharing a mooring line, as shown in Embodiment 1 of the present invention;

[0037] Figure 2 This is a schematic diagram of an intracellular floating structure sharing a mooring line, as shown in Embodiment 1 of the present invention;

[0038] Figure 3 This is a schematic diagram of the shared anchor point of the floating structure shown in Embodiment 1 of the present invention;

[0039] Figure 4 This is a schematic diagram of a floating structure group dual-shared mooring network shown in Embodiment 1 of the present invention;

[0040] Figure 5 This is a schematic diagram of the two-section ordinary mooring line catenary plane shown in Embodiment 1 of the present invention;

[0041] Figure 6 This is a schematic diagram of the shared mooring line catenary plane shown in Embodiment 1 of the present invention. Detailed Implementation

[0042] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0043] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0044] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0045] It should be noted that the flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of methods and systems according to various embodiments of the present invention. It should be noted that each block in a flowchart or block diagram may represent a module, segment, or portion of code, which may include one or more executable instructions for implementing the logical functions specified in the various embodiments. It should also be noted that in some alternative implementations, the functions marked in the blocks may occur in a different order than that shown in the drawings. For example, two consecutively represented blocks may actually be executed substantially in parallel, or they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in the flowcharts and / or block diagrams, and combinations of blocks in the flowcharts and / or block diagrams, may be implemented using a dedicated hardware-based system that performs the specified functions or operations, or using a combination of dedicated hardware and computer instructions.

[0046] Terminology Explanation:

[0047] A floating mooring system at sea includes mooring lines and anchors; mooring lines are mostly made of materials such as anchor chains or polyester fibers, with one end connected to the floating platform and the other end connected to the anchor; the anchor is fixed to the seabed; a multi-line anchor is an anchor connected to multiple mooring lines, i.e., sharing an anchor point.

[0048] Example 1

[0049] This embodiment provides a design method for a dual-shared mooring system.

[0050] This embodiment provides a design method for a dual-shared mooring system, which is a novel design method for mooring systems of floating structures such as floating wind turbines. Specifically, it is a design method for a shared mooring system in which multiple floating offshore wind turbines, floating photovoltaic and other floating structure foundations simultaneously share mooring lines and anchor points.

[0051] This embodiment provides a design method for a dual-shared mooring system, which breaks through the existing design methods of floating marine structures (wind turbines, photovoltaics, etc.) mooring systems. It proposes a floating structure mooring method with dual-shared mooring, that is, in a group of structures composed of floating marine structures, two shared mooring forms are nested at the same time: shared mooring lines and shared anchor points.

[0052] The dual-shared design aims to improve the mooring efficiency and effectiveness of mooring devices (anchor and mooring line). This embodiment provides a design method for a dual-shared mooring system, using an offshore floating wind turbine (with a Spar platform as its bottom floating foundation) as an example. First, a shared mooring line system consisting of two floating wind turbines (two floating structures) serves as the cell of the shared network. The two Spar floating platforms within this cell are connected by a transversely arranged shared mooring line, as shown below. Figure 1 As shown, this reduces the number of required anchor points and mooring lines, corresponding to the first type of shared mooring. Adjacent shared mooring cells share anchor points, meaning one anchor point connects to four mooring lines from four different cells, as shown below. Figure 2 As shown, this corresponds to the second type of shared mooring.

[0053] Within the dual-shared network cell of an offshore floating structure group (wind farm), a shared mooring line system is adopted. The cell consists of two floating structures, one shared mooring line (referred to as the shared line), four mooring lines connected to anchors (referred to as anchor lines), and four anchor points, forming the first layer of sharing in the dual-shared network, namely the shared mooring line. The shared line is composed of steel cables with protective sheaths, with both ends connected to the cable guide holes of the offshore floating wind turbine platform. The mooring lines connected to the anchor points (referred to as anchor lines) consist of two or three sections of material. One end of the anchor line is connected to the cable guide hole of the floating platform, and the other end is connected to the anchor point fixed to the seabed. To maintain sufficient safety margin, a catenary mooring method is adopted, and one section of the anchor line lies flat on the seabed. The anchor lines are arranged symmetrically about the shared line, such as... Figure 2 As shown.

[0054] Simultaneously, four adjacent shared network cells share anchor points. These shared anchor points are suction pile anchors (SPA) suitable for bearing multi-directional loads. These shared anchor points connect to mooring lines from the four adjacent cells, exhibiting 90° rotational symmetry, thus forming the second layer of shared anchor points in the dual-shared mooring system. In offshore floating structure dual-shared mooring networks, shared mooring lines are used within the cells, and cells are interconnected through shared anchor points. The first layer of sharing is nested within the second layer, ultimately forming a dual-shared mooring network, as shown below. Figure 4 As shown, this significantly improves mooring efficiency and economic benefits.

[0055] The design of the floating wind turbine dual-shared mooring system mainly consists of two parts: the shared line system and the shared anchor point system.

[0056] (1) Design of mooring line system based on catenary equation:

[0057] The catenary plane is a vertical plane defined by the shape of the catenary. In engineering design, ordinary mooring lines are usually designed in multiple segments, each with different mooring characteristics, such as material, diameter, and linear density. A two-segment ordinary mooring line plan is shown below. Figure 5 As shown. The origin of the coordinate system is located at cable guide hole P. f At (0,0), the upper end of the mooring line section s2 is connected to the cable guide hole P. f It is connected to the lower segment s1 via connection point Pc, and the end of the lower segment is connected to anchor point P. a L b It is the contact point P between the lower section and the seabed. t To anchor point P a The distance between them.

[0058] The nonlinear elastic equations for each segment and the mechanical equilibrium equations for the connection points are established. The equations for the two-segment ordinary mooring catenary are as follows:

[0059]

[0060]

[0061] In the formula, h and l are respectively P f With P t The vertical and horizontal distances between them. H and V are the horizontal and vertical components of the tension T at the guide hole, respectively. s1 and s2 are the stress-free lengths of the lower and upper sections of the mooring line. and E1A1 and E2A2 represent the weight of the upper and lower mooring lines in the water. E1A1 and E2A2 are the tensile stiffness of the upper and lower sections, respectively.

[0062] The catenary plane of the shared mooring line is as follows Figure 6 As shown, the origin of the coordinate system is located at the first cable guide hole P. f Place.

[0063] Based on Hooke's Law, Newton's First Law, and the principle of conservation of mass, the equation for the nonlinear elastic catenary of a shared mooring line is as follows:

[0064]

[0065]

[0066] In the formula l * and h * H represents the horizontal and vertical distances between the two endpoints of the shared mooring line, respectively. * and V * These are the horizontal and vertical components of the tension T of the shared line at the cable guide hole, respectively, and s is the total stress-free length of the shared line. E is the weight of the shared linear element in water. E and A are the elastic modulus and cross-sectional area of ​​the shared linear element.

[0067] The specific design process of the shared line system is as follows: First, based on the input variable h * ,s, E and A represent the distance l between the two endpoints of a given shared mooring line. * The mooring tension component (the tension component of the shared line at the guide hole) H can be calculated using formulas 3 and 4. * and V * .

[0068] The locations of the guide hole and anchor point are fixed. Since the current force acting on the mooring line is ignored, the vertical tension component V is determined solely by the weight of the mooring line in the water. The iterative process involves the initial design input variable L. b The value of l can be obtained by solving equations 1 and 2. The tension components H and V of the anchor line at the guide hole are then obtained and compared with the tension components of the shared line at the guide hole. By continuously updating L... b The iteration continues until the tension components of the anchor line and the shared line at the cable guide hole are equal, then the iteration is complete.

[0069] (2) The structural form, dimensions and other parameters of the anchor need to be designed according to the magnitude of the load on the anchor:

[0070] In a single-line mooring system, the variation in anchor load is controlled by the tension at the end of the single mooring line (obtained through time-domain response calculations). For a multi-line mooring system, the anchor must withstand tension loads from the ends of multiple mooring lines (anchor lines).

[0071] The net load on a shared anchor point is defined as the vector sum of the mooring line tension vectors acting on that anchor, and is simply referred to as the net force T of the multi-line anchor. multi The calculation formula is as follows:

[0072]

[0073] Where T i T is the tension vector generated by each mooring line acting on the multi-line anchor, where n is the number of mooring lines connected to the multi-line anchor. Because of the catenary mooring method, the anchor is not subjected to forces from the vertical direction; therefore, the component of the tension in the Z-direction is always zero. multi The magnitude can be simplified to the force acting on it in the XY plane:

[0074]

[0075] Among them, T multiX With T multiY These are the resultant forces of the components of the tension along each line of action in the X and Y directions, respectively.

[0076] The dual-shared mooring method can effectively reduce mooring line costs, anchor costs, seabed geotechnical survey costs, and installation costs. It also reduces installation steps, thereby lowering operational risks, significantly improving the utilization efficiency of the mooring system, promoting the large-scale commercialization of offshore floating wind farms and photovoltaic power plants, and enhancing technological competitiveness in the field of deep-sea floating wind turbines. This invention has broad application prospects in offshore floating wind turbines, floating photovoltaic systems, and other floating structure clusters.

[0077] Example 2

[0078] This embodiment provides a design system for a dual-shared mooring system.

[0079] A design system for a dual-shared mooring system includes:

[0080] The data acquisition module is configured to: for a shared mooring line, acquire the horizontal and vertical distances between the two endpoints of the shared mooring line, and calculate the tension component of the shared mooring line at the guide hole using the nonlinear elastic catenary equation of the shared mooring line;

[0081] Anchor line design module, which is configured to: for anchor line, based on the tension component of the shared mooring line at the guide hole, obtain the distance between the contact point of the anchor line and the seabed and the anchor point by iteratively solving the two-segment ordinary mooring line catenary equation;

[0082] Anchor design module, configured to: for anchor, obtain the tension at the end of the anchor line connected to the anchor, calculate the net load on the anchor point, and calculate the anchor parameters based on the net load on the anchor point;

[0083] The shared mooring line is set between two floating structures, each of which has multiple anchor lines, and the anchor lines of the two floating structures do not share anchor points.

[0084] It should be noted that the above modules implement the same examples and application scenarios as the steps in Embodiment 1, but are not limited to the content disclosed in Embodiment 1. It should also be noted that the above modules, as part of a system, can be executed in a computer system such as a set of computer-executable instructions.

[0085] Example 3

[0086] This embodiment provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the steps in the design method of a dual-shared mooring system as described in Embodiment 1 above.

[0087] Example 4

[0088] This embodiment provides a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the program, it implements the steps in the design method of a dual-shared mooring system as described in Embodiment 1 above.

[0089] Example 5

[0090] This embodiment provides a dual shared mooring system, including multiple anchors, a shared mooring line disposed between two floating structures, and multiple anchor lines connecting the anchors and the floating structures, wherein the anchor lines of the two floating structures that do not have a shared mooring line share an anchor point;

[0091] The anchor parameters and the distance between the contact point between the anchor line and the seabed and the anchor point were designed using the design method of a dual-shared mooring system described in Example 1.

[0092] This embodiment provides a dual-shared mooring system that enables intelligent ice resistance in offshore photovoltaic (PV) fields and can promptly feed back the working status of each part of the system to the onshore control center, achieving real-time interconnection between the offshore PV field ice resistance system and the onshore control center. It can centrally monitor and control the operation of the entire PV field dual-shared mooring system on land and issue early warnings in the event of extreme ice conditions.

[0093] This embodiment provides a dual-shared mooring system that adopts targeted anti-icing solutions for different areas of the offshore photovoltaic field. It has intelligent and self-sufficient anti-icing effects and its power supply is self-sufficient, eliminating the need to connect to a power source outside the offshore photovoltaic field. This improves the overall anti-icing capability of the offshore photovoltaic field and reduces power consumption and operating costs.

[0094] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A design method for a dual-shared mooring system, characterized in that, include: For a shared mooring line, the horizontal and vertical distances between the two endpoints of the shared mooring line are obtained, and the tension component of the shared mooring line at the guide hole is calculated using the nonlinear elastic catenary equation of the shared mooring line. For the anchor line, based on the tension component of the shared mooring line at the guide hole, the distance between the contact point between the anchor line and the seabed and the anchor point is obtained by iteratively solving the two-segment ordinary mooring line catenary equation. For the anchor, obtain the tension at the end of the anchor line connected to the anchor, calculate the net load on the anchor point, and calculate the anchor parameters based on the net load on the anchor point. The shared mooring line is set between two floating structures, each floating structure is equipped with multiple anchor lines, and there is no shared anchor point between the anchor lines of the two floating structures with the shared mooring line; Two floating structures, a shared mooring line between the two floating structures, four anchor points, and four anchor lines connecting the anchors to the floating structures constitute a cell. The four adjacent cell bodies share anchor points with each other; The specific steps of the iterative solution include: The distance between the contact point between the anchor line and the seabed and the anchor point is initially set. By solving the two-segment catenary equation of a normal mooring line, the tension component of the anchor line at the guide hole is obtained and compared with the tension component of the shared mooring line at the guide hole. If the tension components of the anchor line and the shared line at the guide hole are not equal, update the distance between the anchor line's contact point with the seabed and the anchor point until the tension components of the anchor line and the shared line at the guide hole are equal.

2. The design method of a dual-shared mooring system according to claim 1, characterized in that, The nonlinear elastic catenary equation for the shared mooring line is constructed based on Hooke's law, Newton's first law, and the principle of conservation of mass.

3. The design method of a dual-shared mooring system according to claim 1, characterized in that, The anchor lines are arranged symmetrically about the shared mooring lines.

4. A design system for a dual-shared mooring system, characterized in that, A design method for a dual-shared mooring system according to any one of claims 1-3 includes: The data acquisition module is configured to: for a shared mooring line, acquire the horizontal and vertical distances between the two endpoints of the shared mooring line, and calculate the tension component of the shared mooring line at the guide hole using the nonlinear elastic catenary equation of the shared mooring line; Anchor line design module, which is configured to: for anchor line, based on the tension component of the shared mooring line at the guide hole, obtain the distance between the contact point of the anchor line and the seabed and the anchor point by iteratively solving the two-segment ordinary mooring line catenary equation; Anchor design module, configured to: for anchor, obtain the tension at the end of the anchor line connected to the anchor, calculate the net load on the anchor point, and calculate the anchor parameters based on the net load on the anchor point; The shared mooring line is set between two floating structures, each of which has multiple anchor lines, and the anchor lines of the two floating structures do not share anchor points.

5. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the program is executed by the processor, it implements the steps in the design method of a dual-shared mooring system as described in any one of claims 1-3.

6. A computer device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the program, it implements the steps in the design method of a dual-shared mooring system as described in any one of claims 1-3.

7. A dual-shared mooring system, comprising: Multiple anchors, a shared mooring line between two floating structures, and multiple anchor lines connecting the anchors to the floating structures, wherein the anchor lines of the two floating structures do not share a mooring line and share an anchor point; The anchor parameters and the distance between the contact point between the anchor line and the seabed and the anchor point are designed using the design method of a dual-shared mooring system as described in any one of claims 1-3.

Images