Component optimization method and device for offshore wind turbine jacket

Abstract

The invention discloses a component optimization method and device for an offshore wind turbine jacket, and relates to the field of jacket component optimization. According to the method, the lower root distance size of the jacket and the size of the steel pipe pile are linked with geological data and rated equipment data of the offshore wind turbine, so that the lower root distance size of the jacket and the size of the steel pipe pile better meet the actual requirements of the offshore wind turbine; therefore, the optimization accuracy of the lower root opening size and the steel pipe pile size of the offshore wind turbine jacket is improved. By constructing the minimum independent size variable group, the construction size of the jacket can be comprehensively constrained, so that the optimization of the section size of the component is more accurate, and the optimization accuracy of the section size of the component of the offshore wind turbine jacket is improved. And iterative optimization is performed on the most core lower root distance, the steel pipe pile and the section size of the component in the offshore wind turbine jacket, so that the component optimization accuracy of the offshore wind turbine jacket is improved, and stable operation of the offshore wind turbine is guaranteed.

Description

Technical Field

[0001] The present invention belongs to the field of pipe frame component optimization, and in particular relates to a component optimization method and device for an offshore wind turbine pipe frame. Background Art

[0002] With the continuous development of marine resources, offshore platforms are also being widely constructed and applied. Among them, the jacket structure is born out of offshore oil exploitation. It is a fixed marine engineering structure with advantages such as large deck area, large variable load, and safe and reliable structure. It is widely used in offshore oil production platforms. In recent years, offshore wind power has gradually developed to deep sea. The jacket foundation is increasingly used in offshore wind turbine foundations due to its good stiffness performance and strong adaptability to water depth.

[0003] Due to the particularity and complexity of the working loads on the jacket in the marine environment, a large number of calculations need to be performed in the jacket design environment to determine the size selection of each structural component. However, in the current design process of the jacket of offshore wind turbines, the diameter, thickness and height of the tower in the jacket are calculated through the information of the ocean and the wind turbine, so as to complete the intelligent design of the jacket. However, this method is limited to the wind turbine information, ocean information and tower size, resulting in the jacket component optimization being not comprehensive and accurate. Another method is to collect data for knowledge distillation to obtain the jacket component optimization, but this method is limited by the collected data and cannot accurately optimize the jacket components according to the actual working environment of the offshore wind turbine. Therefore, there is an urgent need for a new offshore wind turbine jacket component optimization method and device to solve the defects of the prior art. Summary of the invention

[0004] The present invention aims to provide a component optimization method and device for an offshore wind turbine jacket to solve the above technical problems. By using the data of the offshore wind turbine and the minimum independent size variable group, the lower root opening size, steel pipe pile size and component cross-sectional size of the jacket are optimized, thereby improving the accuracy of component optimization of the offshore wind turbine jacket.

[0005] In order to solve the above technical problems, an embodiment of the present invention provides a component optimization method for an offshore wind turbine jacket, comprising:

[0006] Obtain hydrological data, geological data and rated equipment data for offshore wind turbines;

[0007] Determine the lower root opening size and steel pipe pile size of the jacket according to the geological data and rated equipment data;

[0008] Construct the minimum independent size variable group of the jacket according to the preset offshore wind turbine structural requirements;

[0009] Determining the cross-sectional dimensions of the components of the jacket according to the minimum independent dimension variable group;

[0010] According to the lower root opening size, steel pipe pile size and component cross-sectional size, combined with the hydrological data, geological data and rated equipment data of the offshore wind turbine, the components of the offshore wind turbine jacket are optimized and verified to obtain the optimal jacket of the offshore wind turbine.

[0011] It can be understood that, compared with the prior art, the present invention optimizes the lower root opening size and steel pipe pile size of the jacket through the geological data and rated equipment data of the offshore wind turbine, so that the lower root opening size and steel pipe pile size of the jacket are linked to the geological data and rated equipment data of the offshore wind turbine, so that the lower root opening size and steel pipe pile size of the jacket are more in line with the actual needs of the offshore wind turbine, thereby improving the accuracy of the optimization of the lower root opening size and steel pipe pile size of the jacket of the offshore wind turbine. By constructing the minimum independent size variable group, the component size of the jacket can be fully constrained, so that the optimization of the cross-sectional size of the component is more accurate, and the accuracy of the optimization of the cross-sectional size of the component of the jacket of the offshore wind turbine is improved. Based on the hydrological data, geological data and rated equipment data of the offshore wind turbine, the most core lower root opening, steel pipe pile and component cross-sectional size of the jacket of the offshore wind turbine are iteratively optimized, which improves the accuracy of the optimization of the components of the jacket of the offshore wind turbine, so that the jacket of the offshore wind turbine obtained can better meet the operating requirements of the offshore wind turbine, ensuring the stable operation of the offshore wind turbine.

[0012] As a preferred solution, the determining of the lower root opening size and the steel pipe pile size of the jacket according to the geological data and the rated equipment data specifically includes:

[0013] Determine the lower root opening size of the conductor frame according to the rated equipment data;

[0014] Determine the grouting leg length and leg wall thickness of the jacket according to the preset first optimization method and enumeration method, and then determine the diameter of the steel pipe pile of the jacket;

[0015] Determine the length of the steel pipe piles of the jacket based on the diameter of the steel pipe piles of the jacket and in combination with the geological data;

[0016] The size of the steel pipe pile of the conductor frame is obtained according to the pile diameter and the pile length of the steel pipe pile of the conductor frame.

[0017] This preferred solution optimizes the lower root opening size and steel pipe pile size of the jacket through the geological data and rated equipment data of the offshore wind turbine, so that the lower root opening size and steel pipe pile size of the jacket are linked to the geological data and rated equipment data of the offshore wind turbine, making the lower root opening size and steel pipe pile size of the jacket more in line with the actual needs of the offshore wind turbine, thereby improving the optimization accuracy of the lower root opening size and steel pipe pile size of the jacket of the offshore wind turbine.

[0018] As a preferred solution, the method of determining the grouting leg length and the leg wall thickness of the jacket according to the preset first optimization method and the enumeration method, and then determining the diameter of the steel pipe pile of the jacket, specifically includes:

[0019] The pre-equipment pile diameter set is screened according to the enumeration method, and the offshore wind turbine frequency corresponding to the screened candidate pile diameters is verified to obtain the initial pile diameter;

[0020] According to the preset first optimization method, the length and wall thickness of the slurry plug leg of the jacket are determined in combination with the initial pile diameter, and then the diameter of the steel pipe pile of the jacket is determined.

[0021] This preferred solution optimizes and enumerates the grouting leg length and leg wall thickness of the jacket so that the diameter of the steel pipe piles of the jacket is more in line with the operation requirements of the offshore wind turbine, thereby improving the accuracy of the optimization of the steel pipe pile size of the offshore wind turbine jacket.

[0022] As a preferred solution, the preset first optimization method is used to determine the length and wall thickness of the grouting legs of the jacket in combination with the initial pile diameter, and then determine the diameter of the steel pipe piles of the jacket, specifically including:

[0023] Determine the size limit table of the jacket grouting section according to the preset offshore wind turbine structural requirements and in combination with the initial pile diameter;

[0024] Constructing a radial contact pressure expression for the jacket grouting section according to the jacket grouting section size restriction table;

[0025] Determine the wall thickness of the jacket leg and the first pile diameter according to the radial contact pressure expression of the jacket grouting section;

[0026] Constructing an expression for the axial bearing capacity of the jacket grouting section according to the jacket grouting section size restriction table;

[0027] According to the expression of the axial bearing capacity of the grouting section of the jacket, the grouting leg length and the second pile diameter of the jacket are determined in combination with the first pile diameter;

[0028] The diameter of the steel pipe piles of the conductor frame is determined according to the second pile diameter.

[0029] This preferred solution optimizes and enumerates the grouting leg length and leg wall thickness of the jacket so that the diameter of the steel pipe piles of the jacket is more in line with the operation requirements of the offshore wind turbine, thereby improving the accuracy of the optimization of the steel pipe pile size of the offshore wind turbine jacket.

[0030] As a preferred solution, the determining of the length of the steel pipe piles of the jacket based on the diameter of the steel pipe piles of the jacket in combination with the geological data specifically includes:

[0031] Constructing an axial bearing capacity expression and an anti-pull bearing capacity expression of the jacket according to the geological data;

[0032] According to the axial bearing capacity expression and the anti-pull bearing capacity expression, combined with the diameter of the steel pipe pile of the jacket, the preset steel pipe pile length is iteratively optimized using the dichotomy method to obtain the steel pipe pile length of the jacket.

[0033] This preferred solution constructs the axial bearing capacity expression and the anti-pullout bearing capacity expression of the jacket through geological data, so as to iteratively optimize the length of the steel pipe piles of the jacket, so that the length of the steel pipe piles of the jacket is more in line with the operation requirements of the offshore wind turbine, thereby improving the accuracy of the optimization of the steel pipe pile size of the offshore wind turbine jacket.

[0034] As a preferred solution, the minimum independent size variable group of the jacket is constructed according to the preset offshore wind turbine structural requirements, specifically including:

[0035] Obtain the variation range of the outer diameter and wall thickness of the round tube in the jacket according to the preset offshore wind turbine structural requirements;

[0036] According to the preset offshore wind turbine structural requirements, the upper limit of the wall thickness difference between the adjacent wall thickness segments on the main leg and the diagonal brace in the jacket is obtained;

[0037] A minimum independent size variable group of the catheter frame is constructed according to the variation range and the upper limit of the wall thickness difference.

[0038] This preferred solution constructs a minimum independent size variable group through the variation range of the outer diameter and wall thickness of the circular tube in the conductor rack and the upper limit of the wall thickness difference between adjacent wall thickness segments on the main legs and the diagonal braces, which can constrain the components of the conductor rack, thereby ensuring the optimization accuracy of the cross-sectional dimensions of the components of the conductor rack.

[0039] As a preferred solution, the determining of the cross-sectional dimensions of the components of the jacket according to the minimum independent dimension variable group specifically includes:

[0040] The minimum independent size variable group is used as a driving parameter, and a calculation model is established in combination with a preset component maximum stress ratio, a component minimum stress ratio and a component fatigue damage target range;

[0041] Iterate and evaluate the preset initial component cross-sectional dimensions of the jacket according to the calculation model to obtain an evaluation result;

[0042] When the evaluation result meets the preset threshold requirement, the iteration of the preset initial component cross-sectional size is completed to obtain the component cross-sectional size of the conductor pipe rack.

[0043] This preferred solution can comprehensively constrain the component dimensions of the jacket through the minimum independent dimension variable group, thereby making the optimization of the component cross-sectional dimensions more accurate and improving the accuracy of the optimization of the component cross-sectional dimensions of the offshore wind turbine jacket.

[0044] As a preferred solution, the preset initial component cross-sectional dimensions of the jacket are iterated and evaluated according to the calculation model to obtain an evaluation result, which specifically includes:

[0045] The preset initial component cross-sectional dimensions include: initial circular tube component cross-sectional dimensions;

[0046] The outer diameter and the wall thickness of the initial cross-sectional dimensions of the circular tube component are iterated and evaluated in sequence according to the calculation model to obtain a wave and current load evaluation result of the initial cross-sectional dimensions of the circular tube component.

[0047] This preferred solution can comprehensively constrain the component dimensions of the jacket through the minimum independent dimension variable group, thereby making the optimization of the component cross-sectional dimensions more accurate and improving the accuracy of the optimization of the component cross-sectional dimensions of the offshore wind turbine jacket.

[0048] As a preferred solution, the components of the offshore wind turbine jacket are optimized and verified according to the lower root opening size, steel pipe pile size and component cross-sectional size, combined with the hydrological data, geological data and rated equipment data of the offshore wind turbine, to obtain the optimal jacket of the offshore wind turbine, specifically including:

[0049] Obtain several calibration indicators of offshore wind turbine jackets based on hydrological data, geological data and rated equipment data of offshore wind turbines;

[0050] Constructing an initial jacket of an offshore wind turbine according to the lower root opening size, steel pipe pile size and component cross-sectional size;

[0051] The initial jacket is verified according to each verification index, and the lower root opening size, steel pipe pile size and component cross-sectional size are optimized according to the verification result, so that the initial jacket of the offshore wind turbine meets each verification index, and the optimal jacket of the offshore wind turbine is obtained.

[0052] This preferred solution iteratively optimizes the core lower root opening, steel pipe piles and component cross-sectional dimensions of the offshore wind turbine jacket through the hydrological data, geological data and rated equipment data of the offshore wind turbine, thereby improving the component optimization accuracy of the offshore wind turbine jacket, making the obtained offshore wind turbine jacket more in line with the operating requirements of the offshore wind turbine and ensuring the stable operation of the offshore wind turbine.

[0053] Accordingly, an embodiment of the present invention provides a component optimization device for an offshore wind turbine jacket, comprising: an offshore wind turbine data acquisition module, a lower root opening and steel pipe pile size calculation module, a minimum independent size variable group calculation module, a component cross-section size calculation module, and an optimal jacket construction module;

[0054] Wherein, the offshore wind turbine data acquisition module is used to acquire hydrological data, geological data and rated equipment data of the offshore wind turbine;

[0055] The lower root opening and steel pipe pile size calculation module is used to determine the lower root opening size and steel pipe pile size of the jacket according to the geological data and rated equipment data;

[0056] The minimum independent size variable group calculation module is used to construct the minimum independent size variable group of the jacket according to the preset offshore wind turbine construction requirements;

[0057] The component cross-sectional dimension calculation module is used to determine the component cross-sectional dimension of the jacket according to the minimum independent dimension variable group;

[0058] The optimal jacket construction module is used to optimize and verify the components of the offshore wind turbine jacket according to the lower root opening size, steel pipe pile size and component cross-sectional size, combined with the hydrological data, geological data and rated equipment data of the offshore wind turbine, to obtain the optimal jacket of the offshore wind turbine.

[0059] It can be understood that, compared with the prior art, the present device optimizes the lower root opening size and steel pipe pile size of the jacket through the geological data and rated equipment data of the offshore wind turbine, so that the lower root opening size and steel pipe pile size of the jacket are linked to the geological data and rated equipment data of the offshore wind turbine, so that the lower root opening size and steel pipe pile size of the jacket are more in line with the actual needs of the offshore wind turbine, thereby improving the accuracy of the optimization of the lower root opening size and steel pipe pile size of the jacket of the offshore wind turbine. By constructing the minimum independent size variable group, the construction size of the jacket can be fully constrained, so that the optimization of the cross-sectional size of the component is more accurate, and the accuracy of the optimization of the cross-sectional size of the component of the jacket of the offshore wind turbine is improved. Based on the hydrological data, geological data and rated equipment data of the offshore wind turbine, the most core lower root opening, steel pipe pile and cross-sectional size of the jacket of the offshore wind turbine are iteratively optimized, which improves the accuracy of the optimization of the components of the jacket of the offshore wind turbine, so that the jacket of the offshore wind turbine can better meet the operating requirements of the offshore wind turbine, and ensure the stable operation of the offshore wind turbine. BRIEF DESCRIPTION OF THE DRAWINGS

[0060] Figure 1 : A flowchart of the steps of a component optimization method for an offshore wind turbine jacket provided by an embodiment of the present invention;

[0061] Figure 2: A schematic diagram of a grouting structure of an offshore wind turbine jacket provided by an embodiment of the present invention;

[0062] Figure 3 : A schematic diagram of independent dimension variables of an offshore wind turbine jacket provided by an embodiment of the present invention;

[0063] Figure 4 : A flow chart of an offshore wind turbine jacket optimization algorithm provided by an embodiment of the present invention;

[0064] Figure 5 : A schematic structural diagram of a component optimization device for an offshore wind turbine jacket provided by an embodiment of the present invention;

[0065] Among them, 201: offshore wind turbine data acquisition module; 202: lower root opening and steel pipe pile size calculation module; 203: minimum independent size variable group calculation module; 204: component section size calculation module; 205: optimal jacket construction module. DETAILED DESCRIPTION

[0066] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0067] The jacket structure was born out of offshore oil exploitation and is a fixed marine engineering structure with the advantages of large deck area, large variable load, safe and reliable structure, etc. In recent years, offshore wind power has gradually developed towards deep seas, and the jacket foundation is increasingly being used in offshore wind turbine foundations due to its good stiffness performance and strong adaptability to water depth.

[0068] Due to the particularity and complexity of the marine environment and the working loads on the jacket, a large amount of numerical calculations are required in each link of the jacket design, and quantitative analysis is used to support the size selection of each structural component. In the jacket design, the main steps that require calculation support are: overall structural layout, selection of structural component sections, pile foundation selection, and grouting connection design. The jacket of an offshore wind turbine includes: an outer platform, ladder and cage, fall arrester, mooring parts, sacrificial anodes, main legs, submarine cable protection pipes, grouting pipelines, grouting connection sections, guide tips, upper transition sections, intermediate platforms, and X-supports.

[0069] Among them, the overall structural layout of the jacket needs to reasonably determine the upper and lower root openings of the jacket main legs and the number of X-braces based on the water depth and wave height information of the offshore wind farm site, so that the stress of the jacket rigid frame part and the steel pipe piles can reach a reasonable state; the selection of structural component sections includes determining the parameters such as the outer diameter, wall thickness, tapered section variable diameter length of each section according to the stress conditions of each jacket component, so that each component can obtain the lowest total structural weight under the premise of meeting the control conditions such as strength, stability, node shearing, fatigue, and whole machine frequency; the pile foundation selection includes determining the pile diameter, pile length, and pile construction method based on the pile foundation bearing capacity requirements of the jacket foundation and the geological parameters of the machine site, so that the pile foundation engineering volume is optimized and the whole machine frequency can meet the design requirements; the grouting connection design is the design of high-strength concrete grouting between the nested connection with the steel pipe piles. The grouting connection section needs to meet the axial and bending bearing capacity requirements. The pile diameter, plug tip wall thickness, and pile top wall thickness are all related control variables.

[0070] Therefore, in the above-mentioned structural composition of the offshore wind turbine duct rack, the technicians proposed an offshore wind turbine duct rack design method based on artificial intelligence. This method trains the artificial intelligence regression model through the hydrological and wind turbine parameters of the offshore wind turbine, but fails to consider the impact of geological conditions on the structure. It is also limited to the tower diameter, thickness and height, and fails to optimize the complex foundation type of the duct rack foundation. The technicians also proposed another offshore wind turbine duct rack design method that combines knowledge distillation with transfer learning, but this method relies on public data sets for knowledge distillation and cannot guarantee that the designed offshore wind turbine duct rack meets the actual standards. Therefore, based on the above-mentioned defects of the prior art and combined with the structural composition of the offshore wind turbine duct rack, the embodiment of the present invention proposes a component optimization method and device for the offshore wind turbine duct rack. For details, please refer to Example 1 and Example 2 below.

[0071] Embodiment 1

[0072] Please refer to Figure 1 , is a flowchart of a method for optimizing components of an offshore wind turbine jacket provided by an embodiment of the present invention, including steps S101-S105.

[0073] Step S101: Acquire hydrological data, geological data and rated equipment data of the offshore wind turbine.

[0074] In an optional embodiment, the hydrological data of the offshore wind turbine include: water level, wind, wave, current, machine position coordinates, wave numerical model point coordinates, wind rose diagram, wave rose diagram, wave scatter diagram and wave numerical model parameters; the geological data of the offshore wind turbine include: seismic acceleration, seawater resistivity, machine position mud surface elevation, seismic response spectrum curve and drilling parameter table; the rated equipment data of the offshore wind turbine include: load calculation foundation top elevation, large component weight, large component center of mass coordinates, large component moment of inertia, extreme working condition foundation load, power generation condition foundation load, equivalent fatigue load, whole machine frequency window, tower equivalent density, tower geometry and tower concentrated additional mass distribution;

[0075] Step S102: Determine the lower root opening size and steel pipe pile size of the jacket according to the geological data and rated equipment data.

[0076] In this embodiment, the determining of the lower root opening size and the steel pipe pile size of the jacket according to the geological data and the rated equipment data specifically includes:

[0077] Determine the lower root opening size of the conductor frame according to the rated equipment data;

[0078] Determine the grouting leg length and leg wall thickness of the jacket according to the preset first optimization method and enumeration method, and then determine the diameter of the steel pipe pile of the jacket;

[0079] Determine the length of the steel pipe piles of the jacket based on the diameter of the steel pipe piles of the jacket and in combination with the geological data;

[0080] The size of the steel pipe pile of the conductor frame is obtained according to the pile diameter and the pile length of the steel pipe pile of the conductor frame.

[0081] This embodiment optimizes the lower root opening size and steel pipe pile size of the jacket through the geological data and rated equipment data of the offshore wind turbine, so that the lower root opening size and steel pipe pile size of the jacket are linked to the geological data and rated equipment data of the offshore wind turbine, so that the lower root opening size and steel pipe pile size of the jacket are more in line with the actual needs of the offshore wind turbine, thereby improving the optimization accuracy of the lower root opening size and steel pipe pile size of the jacket of the offshore wind turbine.

[0082] Please refer to Figure 2 , is a schematic diagram of a grouting structure of an offshore wind turbine jacket provided by an embodiment of the present invention; wherein, R JL is the outer radius of the jacket leg (i.e. grouting leg), t JL is the wall thickness of the jacket leg, R p is the outer radius of the jacket steel pipe pile, t p is the wall thickness of the jacket steel pipe pile, t g is the wall thickness of the jacket grouting slurry, s is the jacket shear key spacing, and L is the length of the jacket steel pipe pile.

[0083] In this embodiment, the method of determining the grouting leg length and the leg wall thickness of the jacket according to the preset first optimization method and the enumeration method, and then determining the diameter of the steel pipe pile of the jacket, specifically includes:

[0084] The pre-equipment pile diameter set is screened according to the enumeration method, and the offshore wind turbine frequency corresponding to the screened candidate pile diameters is verified to obtain the initial pile diameter;

[0085] According to the preset first optimization method, the length and wall thickness of the slurry plug leg of the jacket are determined in combination with the initial pile diameter, and then the diameter of the steel pipe pile of the jacket is determined.

[0086] This embodiment optimizes and enumerates the grouting leg length and leg wall thickness of the jacket so that the diameter of the steel pipe piles of the jacket is more in line with the operation requirements of the offshore wind turbine, thereby improving the accuracy of the optimization of the steel pipe pile size of the offshore wind turbine jacket.

[0087] In an optional embodiment, the pre-equipment pile diameter set is first screened by enumeration method to verify whether the whole machine frequency is within the frequency window given by the wind turbine manufacturer, and then the initial pile diameter is obtained.

[0088] In this embodiment, the method of determining the length and wall thickness of the grouting legs of the jacket according to the preset first optimization method in combination with the initial pile diameter, and then determining the diameter of the steel pipe piles of the jacket, specifically includes:

[0089] Determine the size limit table of the jacket grouting section according to the preset offshore wind turbine structural requirements and in combination with the initial pile diameter;

[0090] Constructing a radial contact pressure expression for the jacket grouting section according to the jacket grouting section size restriction table;

[0091] Determine the wall thickness of the jacket leg and the first pile diameter according to the radial contact pressure expression of the jacket grouting section;

[0092] Constructing an expression for the axial bearing capacity of the jacket grouting section according to the jacket grouting section size restriction table;

[0093] According to the expression of the axial bearing capacity of the grouting section of the jacket, the grouting leg length and the second pile diameter of the jacket are determined in combination with the first pile diameter;

[0094] The diameter of the steel pipe piles of the conductor frame is determined according to the second pile diameter.

[0095] This embodiment optimizes and enumerates the grouting leg length and leg wall thickness of the jacket so that the diameter of the steel pipe piles of the jacket is more in line with the operation requirements of the offshore wind turbine, thereby improving the accuracy of the optimization of the steel pipe pile size of the offshore wind turbine jacket.

[0096] In an optional embodiment, please refer to Table 1, which is a dimension limitation table of a jacket grouting section provided in an embodiment of the present invention.

[0097] Table 1

[0098]

[0099]

[0100] In some optional implementations of this embodiment, an expression for the axial bearing capacity of the jacket grouting section is constructed according to the jacket grouting section size restriction table, specifically including the calculation process of equations (1) to (11) in the following optional implementations.

[0101] In an optional embodiment, the moment of inertia of the cross section of the jacket grouting leg (leg column) is determined:

[0102] I JL =π((2R JL ) 4 -(2R JL -2t JL ) 4 ) / 64 (1),

[0103] Among them, I JL is the cross-sectional moment of inertia, R JL is the radius of the jacket grouting leg, t JL is the wall thickness of the conductor leg.

[0104] In an alternative embodiment, the support spring stiffness is determined:

[0105]

[0106] Among them, k rD is the stiffness of the support spring, E is the elastic modulus of the steel (in MPa), R JL is the radius of the jacket grouting leg, t JL is the wall thickness of the jacket leg, R p is the outer radius of the jacket steel pipe pile, t p is the wall thickness of the jacket steel pipe pile, t g is the wall thickness of the jacket grouting slurry, and m is the elastic modulus ratio of steel to high-strength grouting material.

[0107] In an optional embodiment, the elastic length of the steel pipe pile is determined according to the cross-sectional inertia moment and the support spring stiffness:

[0108]

[0109] Among them, l e is the elastic length of the steel pipe pile, k rDis the stiffness of the support spring, I JL is the moment of inertia of the cross section, and E is the elastic modulus of the steel (in MPa).

[0110] In an optional embodiment, the number of effective shear keys of the steel pipe pile under the action of axial force is determined according to the elastic length of the steel pipe pile:

[0111] n=floor[(Lg-sEdge-l e ) / s] (4),

[0112] Among them, n is the number of effective shear keys of the steel pipe pile under the action of axial force, Lg is the total grouting length of the steel pipe pile, sEdge is used to accommodate the fit between the pile driver's bayonet and the inner wall of the pile top, l e is the elastic length of the steel pipe pile, and s is the shear key spacing of the jacket.

[0113] In an optional embodiment, the design load strength per unit length of a single shear key is determined according to the number of effective shear keys of the steel pipe pile under the action of axial force:

[0114]

[0115] Among them, F V is the design load strength per unit length of a single shear key, R JL is the radius of the jacket grouting leg, n is the number of effective shear keys of the steel pipe pile under axial force, and V is the maximum design value of the axial force of each leg of the jacket under each working condition.

[0116] In an optional embodiment, the radial stiffness is determined according to the jacket grouting section size limit table:

[0117]

[0118] Where k is the radial stiffness, R JL is the outer radius of the jacket leg (i.e. grouting leg), t JL is the wall thickness of the jacket leg, R p is the outer radius of the jacket steel pipe pile, t p is the wall thickness of the jacket steel pipe pile, t g is the wall thickness of the jacket grouting slurry, E is the elastic modulus of the steel (in MPa), and E g is the elastic modulus of the jacket grouting slurry (in MPa).

[0119] In an optional embodiment, the shear strength of the interface of the jacket grouting connection section is determined according to the radial stiffness:

[0120]

[0121] Among them, f bkis the shear strength of the interface of the grouting connection section of the jacket, R JL is the outer radius of the jacket leg (i.e., grouting leg), h is the minimum height of the shear key, s is the jacket shear key spacing, k is the radial stiffness, and f ck It is the characteristic compressive strength of 75mm cubic grout (in MPa).

[0122] In an optional embodiment, the shear strength of the interface of the jacket grouting connection section obtained in formula (7) should not exceed the strength value of the slurry at the time of failure obtained by the following formula (8):

[0123]

[0124] Among them, f bk is the shear strength of the interface of the jacket grouting connection section, h is the minimum height of the shear key, s is the distance between the jacket shear keys, and f ck It is the characteristic compressive strength of 75mm cubic grout (in MPa).

[0125] In an optional embodiment, the characteristic strength per unit length of each shear bond is obtained according to equations (7) and (8):

[0126] F Vcap =f bk s (9),

[0127] Among them, F Vcap is the characteristic strength per unit length of each shear bond, f bk is the shear strength of the interface of the grouting connection section of the jacket, and s is the shear key spacing of the jacket.

[0128] In an optional embodiment, the material coefficient is set to 2.0, and the design strength per unit length of each shear key is determined as:

[0129] F Vcap,d =F Vcap / 2 (10),

[0130] Among them, F Vcap，d is the design strength per unit length of each shear key, F Vcap is the characteristic strength per unit length of each shear bond.

[0131] In an optional embodiment, the expression for the axial bearing capacity of the jacket grouting section is determined based on the design load strength per unit length of a single shear key and the characteristic strength per unit length of each shear key, in combination with the jacket grouting section size restriction table:

[0132] F V ≤F Vcap,d (11)

[0133] Among them, F Vcap,dis the design strength per unit length of each shear key, F V Design load strength per unit length for a single shear key.

[0134] By calculating the above formulas (1) to (11), the expression of the axial bearing capacity of the jacket grouting section can be obtained, so as to determine the length of the grouting legs of the jacket grouting section of the offshore wind turbine. In this process, the diameter of the jacket steel pipe pile is adjusted so that the diameter of the steel pipe pile meets the grouting requirements of the jacket.

[0135] In some optional implementations of this embodiment, the jacket grouting section radial contact pressure expression is constructed according to the jacket grouting section size restriction table, specifically including equations (12) to (13) in the following optional embodiments.

[0136] In an optional embodiment, the maximum nominal radial contact pressure is determined based on the bending moment and shear force of the jacket grouting section:

[0137]

[0138] Among them, p rom is the maximum nominal radial contact pressure, l e is the elastic length of the steel pipe pile, k rD is the stiffness of the support spring, I JL is the cross-sectional inertia moment, E is the elastic modulus of the steel (in MPa), R JL is the outer radius of the jacket leg (i.e., grouting leg), M0 is the bending moment of the jacket grouting section, and Q0 is the shear force of the jacket grouting section.

[0139] In an optional embodiment, the limiting condition of the maximum nominal radial contact pressure is:

[0140] p nom ≤1.5MPa (13),

[0141] Among them, p rom is the maximum nominal radial contact pressure.

[0142] In an optional embodiment, according to the maximum nominal radial contact pressure and its restriction conditions of equations (12) and (13), combined with the jacket grouting section size restriction table, an expression for the jacket grouting section radial contact pressure is constructed.

[0143] It should be noted that, according to equations (1) to (3) and (12), it can be concluded that the bending resistance of the grouting connection section has nothing to do with the height, width, spacing of the shear key and the compressive strength of the slurry, but is related to the relevant parameters of the steel pipe pile and the jacket leg column and the slurry elastic modulus. Therefore, in this embodiment, the outer radius of the jacket grouting leg is set as follows:

[0144] R JL =R p -0.25 (14),

[0145] Among them, R JL R is the outer radius of the jacket leg (i.e. grouting leg), p is the outer radius of the jacket steel pipe pile.

[0146] In some optional implementations of this embodiment, determining the wall thickness of the jacket leg and the first pile diameter according to the radial contact pressure expression of the jacket grouting section specifically includes:

[0147] According to the preset step size, such as 2 mm, the wall thickness of the jacket grouting leg is adjusted to meet the requirements of formula (13). When the adjusted wall thickness exceeds the leg column geometry limit in the jacket grouting section size limit table, or exceeds the corresponding plate rolling thickness limit (95 mm), it means that there is no feasible solution for the bending performance under the current pile diameter, and the pile diameter needs to be increased.

[0148] According to the adjusted wall thickness of the jacket grouting leg and the corresponding pile diameter, the jacket leg wall thickness and the first pile diameter are determined.

[0149] In some optional implementations of this embodiment, the determining of the grouting leg length and the second pile diameter of the jacket according to the expression for the axial bearing capacity of the jacket grouting section in combination with the first pile diameter specifically includes:

[0150] According to a preset step length, such as 0.1 m, the total grouting length Lg in the jacket is adjusted based on the first pile diameter to meet the requirements of formula (11);

[0151] When the ratio of the grouting length to the leg column diameter exceeds the upper limit in the jacket grouting section size limit table, it means that there is no feasible solution for the axial bearing capacity under the current pile diameter, and the pile diameter needs to be increased;

[0152] The total grouting length of the adjusted jacket needs to be checked to see if it exceeds the designed grouting length of the jacket. If it exceeds, the top elevation of the jacket steel pipe piles should be increased.

[0153] The grouting leg length and the second pile diameter of the jacket are determined according to the adjusted total grouting length in the jacket and the corresponding pile diameter.

[0154] It should be noted that, since the adjustment of the wall thickness and the grouting length of the grouting leg is adjusted according to a constant step size, there may be a situation where iterative repeated fluctuations cannot converge. Therefore, the embodiment of the present invention also sets memory variables for the adjustment of the wall thickness and the grouting length respectively. When it is found that a certain variable repeatedly increases and decreases, the optimization branch of the variable is shielded, and only the increase branch is executed to ensure that the algorithm can converge to a feasible solution. Among them, the principle of adjusting the grouting length and the wall thickness of the grouting leg according to the memory variable is the same.

[0155] Specifically, taking the wall thickness of the grouting leg as an example, two memory variables Told and Tnew are set, and the initial value is 0, which are used to record the last and last adjustment of the wall thickness of the grouting leg. When the wall thickness of the grouting leg increases, Told = Tnew, Tnew = 1 is assigned; when the wall thickness of the grouting leg decreases, Told = Tnew, Tnew = -1 is assigned; among them, the wall thickness of the grouting leg is allowed to decrease only when Told × Tnew ≠ -1.

[0156] In this embodiment, the determining of the length of the steel pipe piles of the jacket based on the diameter of the steel pipe piles of the jacket in combination with the geological data specifically includes:

[0157] Constructing an axial bearing capacity expression and an anti-pull bearing capacity expression of the jacket according to the geological data;

[0158] According to the axial bearing capacity expression and the anti-pull bearing capacity expression, combined with the diameter of the steel pipe pile of the jacket, the preset steel pipe pile length is iteratively optimized using the dichotomy method to obtain the steel pipe pile length of the jacket.

[0159] This embodiment constructs an axial bearing capacity expression and an anti-pull bearing capacity expression of the jacket through geological data, so as to iteratively optimize the length of the steel pipe piles of the jacket, so that the length of the steel pipe piles of the jacket is more in line with the operation requirements of the offshore wind turbine, thereby improving the accuracy of the optimization of the steel pipe pile size of the offshore wind turbine jacket.

[0160] In an optional embodiment, the expression of the axial bearing capacity of the jacket specifically includes:

[0161]

[0162] Among them, Q d is the design value of the axial bearing capacity of a single pile (in kN), γ R is the partial coefficient of the axial bearing capacity of a single pile, U is the outer circumference of the shaft section, q fi is the standard value of the ultimate lateral friction resistance of the i-th layer of soil of a single pile (in kPa), q R is the standard value of the ultimate end resistance of a single pile (in kPa), l iis the length of the pile body passing through the i-th layer of soil (in m), A is the outer peripheral area of ​​the pile end (in m 2 ), η is the bearing capacity reduction factor.

[0163] In an optional embodiment, the anti-pullout bearing capacity expression of the jacket specifically includes:

[0164]

[0165] Among them, T d is the design value of the ultimate bearing capacity of a single pile (in kN), γ R is the partial coefficient of the axial bearing capacity of a single pile, U is the outer circumference of the shaft section, ξ i is the reduction factor, q fi is the standard value of the ultimate lateral friction resistance of the i-th layer of soil of a single pile (in kPa), l i is the length of the pile body passing through the i-th layer of soil (in meters), G is the pile weight (in kN), the underwater part is measured by buoyancy, and α is the angle between the pile axis and the vertical line.

[0166] It should be noted that, considering the load on each pile and the possible differences in the geological boreholes corresponding to each pile, the initial pile length of each pile can be substituted into equations (15) and (16) to calculate whether the axial bearing capacity and pull-out bearing capacity are satisfied. If the bearing capacity is not satisfied or there is a surplus, the pile length is iteratively optimized using the binary search method to find the minimum pile length that can meet the bearing capacity, and the length of the steel pipe pile of the jacket is obtained.

[0167] It should be noted that when the jacket foundation in the embodiment of the present invention is arranged in orientation, the orientation of the pile foundation is determined according to the directionality of the load distribution, the pile head force level and the geological bearing capacity. For a jacket foundation with 4 piles, one side is arranged perpendicular to the strong wave direction so that the maximum pull load and compressive load are borne by the 2 piles.

[0168] In an optional embodiment, the pile length restriction conditions of the present invention include: the total length of the steel pipe pile should be able to meet the requirements of one-time lifting, usually the pile length is not more than 100m; meet the driveability requirements. If the pile length calculated under the current pile diameter does not meet the restriction conditions, it is considered that the pile diameter needs to be increased. In order to avoid changes in bearing capacity requirements caused by subsequent component optimization, affecting the feasibility of the pile foundation, the pile bearing capacity can be increased by 1% based on the actual reading.

[0169] Step S103: constructing a minimum independent size variable group of the jacket according to preset offshore wind turbine structural requirements.

[0170] In this embodiment, the minimum independent size variable group of the jacket is constructed according to the preset offshore wind turbine structural requirements, specifically including:

[0171] Obtain the variation range of the outer diameter and wall thickness of the round tube in the jacket according to the preset offshore wind turbine structural requirements;

[0172] According to the preset offshore wind turbine structural requirements, the upper limit of the wall thickness difference between the adjacent wall thickness segments on the main leg and the diagonal brace in the jacket is obtained;

[0173] A minimum independent size variable group of the catheter frame is constructed according to the variation range and the upper limit of the wall thickness difference.

[0174] This embodiment constructs a minimum independent size variable group through the variation range of the outer diameter and wall thickness of the circular tube in the conductor rack and the upper limit of the wall thickness difference between adjacent wall thickness segments on the main legs and the diagonal braces, which can constrain the components of the conductor rack, thereby ensuring the optimization accuracy of the cross-sectional dimensions of the components of the conductor rack.

[0175] In an alternative embodiment, please refer to Figure 3 , is a schematic diagram of independent dimension variables of an offshore wind turbine jacket provided by an embodiment of the present invention; wherein adjacent outer diameter dimensions between coaxial components of the jacket are continuous; D represents the outer diameter dimension, and T represents the wall thickness dimension;

[0176] like Figure 3 As shown in the figure, the independent dimension variable of the outer diameter needs to consider the dimensional continuity between the circular tube components of the catheter rack. For example, L-3, L-4 and L-5 constitute the transition structure of circular tube-cone-circular tube, and two outer diameter variables D1 and D2 are set to describe the simplest and only outer diameter parameter group of the transition result; the wall thickness parameter group can be set according to each independent pipe segment, and needs to be coordinated with the outer diameter and meet the restriction requirements on the wall thickness change of the adjacent pipe segments of the independent pipe segment.

[0177] Specifically, the preset offshore wind turbine structural requirements include: the circular tube structural requirements in ISO19902-2020 and DNVGL-RP-C203-2016; in the circular tube structural requirements in ISO19902-2020, it is necessary to limit 20≤D / T≤60, and for the outer diameter ratio of the tube node brace / chord, the effective range is 0.2 to 1.0, so Figure 3 D4 / D1 in the figure should be in the range of 0.2 to 1.0; in the DNVGL-RP-C203-2016 specification, the stress concentration factor at the butt weld of the round tube is positively correlated with the difference in plate thickness on both sides. It is necessary to control the length of the variable wall thickness cut and the stress concentration factor at the variable wall thickness. The wall thickness difference between adjacent wall thickness segments on the main leg and the diagonal brace should be set with an upper limit, such as 30mm for the main leg and 15mm for the diagonal brace; therefore, through the structural requirements of offshore wind turbines, the variation range of the outer diameter and wall thickness of the round tube in the conductor frame, the upper limit of the wall thickness difference between adjacent wall thickness segments on the main leg and the diagonal brace are obtained, and then the minimum independent size variable group is constructed.

[0178] By constructing a minimum independent size variable group and attaching associated constraints to each size variable, the size of the jacket can be completely defined, and the cross-sectional size of the jacket components can be optimized.

[0179] Step S104: determining the cross-sectional dimensions of the components of the conductor pipe rack according to the minimum independent dimension variable group.

[0180] In this embodiment, determining the cross-sectional dimensions of the components of the jacket according to the minimum independent dimension variable group specifically includes:

[0181] The minimum independent size variable group is used as a driving parameter, and a calculation model is established in combination with a preset component maximum stress ratio, a component minimum stress ratio and a component fatigue damage target range;

[0182] Iterate and evaluate the preset initial component cross-sectional dimensions of the jacket according to the calculation model to obtain an evaluation result;

[0183] When the evaluation result meets the preset threshold requirement, the iteration of the preset initial component cross-sectional size is completed to obtain the component cross-sectional size of the conductor pipe rack.

[0184] This embodiment can comprehensively constrain the component sizes of the jacket through the minimum independent size variable group, thereby making the optimization of the component cross-sectional dimensions more accurate and improving the accuracy of the optimization of the component cross-sectional dimensions of the offshore wind turbine jacket.

[0185] In an optional embodiment, a calculation model is established through parametric modeling with the minimum independent dimensional variable group as the driving parameter. The highest and lowest stress ratios of the components and the target range of fatigue damage are set, such as 1 to 0.75. In each iteration, the model is subjected to ultimate strength, seismic strength and fatigue calculations, and the whole machine frequency is monitored. When the index value calculated by the component is greater than the upper limit, the relevant dimensional value is strengthened according to the strategy; when it is less than the lower limit, the relevant dimensional value is optimized according to the strategy; the cycle is iterated until all dimensional values ​​no longer change.

[0186] In this embodiment, the preset initial component cross-sectional dimensions of the jacket are iterated and evaluated according to the calculation model to obtain an evaluation result, which specifically includes:

[0187] The preset initial component cross-sectional dimensions include: initial circular tube component cross-sectional dimensions;

[0188] The outer diameter and the wall thickness of the initial cross-sectional dimensions of the circular tube component are iterated and evaluated in sequence according to the calculation model to obtain a wave and current load evaluation result of the initial cross-sectional dimensions of the circular tube component.

[0189] It should be noted that in the calculation of wave and current loads, the outer diameter of the circular tube component has a direct impact on the load, while the wall thickness has no effect. Therefore, when all components within the influence range of the outer diameter parameter meet the optimization conditions and each component still meets the structural requirements after the outer diameter optimization, the outer diameter should be optimized first. Otherwise, consider optimizing the local wall thickness. Specifically, Figure 3 As shown in the figure, the influence range of D2 is components L-4 to L-7. Only when components L-4 to L-7 meet the optimization conditions, D2 is optimized, otherwise only the wall thickness parameters of each section are optimized separately. The outer diameter of the component has a significant impact on the overall frequency, so the outer diameter of the component is optimized only when the margin of the overall frequency from the lower limit is greater than or equal to 0.4%. When the margin is greater than or equal to 0.2%, the wall thickness of the component can be optimized.

[0190] This embodiment can comprehensively constrain the component sizes of the jacket through the minimum independent size variable group, thereby making the optimization of the component cross-sectional dimensions more accurate and improving the accuracy of the optimization of the component cross-sectional dimensions of the offshore wind turbine jacket.

[0191] Step S105: Optimizing and verifying the components of the offshore wind turbine jacket according to the lower root opening size, steel pipe pile size and component cross-sectional size, combined with the hydrological data, geological data and rated equipment data of the offshore wind turbine, to obtain the optimal jacket of the offshore wind turbine.

[0192] In this embodiment, the components of the offshore wind turbine jacket are optimized and verified according to the lower root opening size, steel pipe pile size and component cross-sectional size, combined with the hydrological data, geological data and rated equipment data of the offshore wind turbine, to obtain the optimal jacket of the offshore wind turbine, specifically including:

[0193] Obtain several calibration indicators of offshore wind turbine jackets based on hydrological data, geological data and rated equipment data of offshore wind turbines;

[0194] Constructing an initial jacket of an offshore wind turbine according to the lower root opening size, steel pipe pile size and component cross-sectional size;

[0195] The initial jacket is verified according to each verification index, and the lower root opening size, steel pipe pile size and component cross-sectional size are optimized according to the verification result, so that the initial jacket of the offshore wind turbine meets each verification index, and the optimal jacket of the offshore wind turbine is obtained.

[0196] This embodiment uses the hydrological data, geological data and rated equipment data of the offshore wind turbine to iteratively optimize the lower root opening, steel pipe piles and component cross-sectional dimensions that are the most core of the offshore wind turbine jacket, thereby improving the component optimization accuracy of the offshore wind turbine jacket, so that the obtained offshore wind turbine jacket can better meet the operating requirements of the offshore wind turbine, ensuring the stable operation of the offshore wind turbine.

[0197] In an optional embodiment, the verification indicators include: whole machine frequency, grouting section strength, pile bearing capacity, component extreme working condition (ULS) strength, pipe node extreme working condition (ULS) shear strength, component seismic working condition strength, pipe node seismic working condition shear strength, weld fatigue; wherein, the verification indicators can be generated by the hydrological data, geological data and rated equipment data of the offshore wind turbine.

[0198] It should be noted that according to the verification indicators, verification is carried out in sequence. When one indicator is not met, the lower root opening, steel pipe piles and component cross-sectional dimensions are re-optimized until each indicator is passed.

[0199] Please note that, please refer to Figure 4 , which is a flow chart of an offshore wind turbine jacket optimization algorithm provided by an embodiment of the present invention, including inputting hydrological data, geological data and wind turbine data, iterating the lower root opening, pile diameter and cross-sectional size, and then performing performance verification of the whole machine frequency, grouting section strength, pile bearing capacity, component extreme working condition (ULS) strength, pipe node extreme working condition (ULS) shear strength, component seismic working condition strength, pipe node seismic working condition shear strength, and weld fatigue to obtain an optimized offshore wind turbine jacket component.

[0200] During the iteration process of the embodiment of the present invention, the optimization strategies all obtain data from the calculation results of the calculation model of the project. Therefore, the optimization strategies can be set strictly according to the relevant design specifications, are not affected by the characteristics of the reference project, and do not need to evaluate the comparability of the reference project with the current project.

[0201] This embodiment optimizes the lower root opening size and steel pipe pile size of the jacket through the geological data and rated equipment data of the offshore wind turbine, so that the lower root opening size and steel pipe pile size of the jacket are linked to the geological data and rated equipment data of the offshore wind turbine, so that the lower root opening size and steel pipe pile size of the jacket are more in line with the actual needs of the offshore wind turbine, thereby improving the accuracy of the optimization of the lower root opening size and steel pipe pile size of the jacket of the offshore wind turbine. By constructing the minimum independent size variable group, the construction size of the jacket can be fully constrained, so that the optimization of the cross-sectional size of the component is more accurate, and the accuracy of the optimization of the cross-sectional size of the component of the jacket of the offshore wind turbine is improved. Based on the hydrological data, geological data and rated equipment data of the offshore wind turbine, the most core lower root opening, steel pipe pile and cross-sectional size of the jacket of the offshore wind turbine are iteratively optimized, which improves the accuracy of the optimization of the components of the jacket of the offshore wind turbine, so that the jacket of the offshore wind turbine can better meet the operating requirements of the offshore wind turbine, ensuring the stable operation of the offshore wind turbine.

[0202] Embodiment 2

[0203] Please refer to Figure 5, which is a structural schematic diagram of a component optimization device for an offshore wind turbine jacket provided by an embodiment of the present invention, comprising: an offshore wind turbine data acquisition module 201, a lower root opening and steel pipe pile size calculation module 202, a minimum independent size variable group calculation module 203, a component cross-section size calculation module 204 and an optimal jacket construction module 205.

[0204] The offshore wind turbine data acquisition module 201 is used to acquire hydrological data, geological data and rated equipment data of the offshore wind turbine.

[0205] The lower root opening and steel pipe pile size calculation module 202 is used to determine the lower root opening size and steel pipe pile size of the jacket according to the geological data and rated equipment data.

[0206] In this embodiment, the lower root opening and steel pipe pile size calculation module 202 includes: a lower root opening and steel pipe pile size calculation unit;

[0207] The lower root opening and steel pipe pile size calculation unit is used to determine the lower root opening size of the jacket according to the rated equipment data;

[0208] Determine the grouting leg length and leg wall thickness of the jacket according to the preset first optimization method and enumeration method, and then determine the diameter of the steel pipe pile of the jacket;

[0209] Determine the length of the steel pipe piles of the jacket based on the diameter of the steel pipe piles of the jacket and in combination with the geological data;

[0210] The size of the steel pipe pile of the conductor frame is obtained according to the pile diameter and the pile length of the steel pipe pile of the conductor frame.

[0211] In this embodiment, the lower root opening and steel pipe pile size calculation unit includes: a steel pipe pile diameter calculation subunit;

[0212] The steel pipe pile diameter calculation subunit is used to screen the pre-equipment selected pile diameter set according to the enumeration method, and verify the offshore wind turbine frequency corresponding to the screened candidate pile diameters to obtain the initial pile diameter;

[0213] According to the preset first optimization method, the length and wall thickness of the slurry plug leg of the jacket are determined in combination with the initial pile diameter, and then the diameter of the steel pipe pile of the jacket is determined.

[0214] In this embodiment, the steel pipe pile diameter calculation subunit includes: a steel pipe pile diameter calculation component;

[0215] The steel pipe pile diameter calculation component is used to determine the size limit table of the jacket grouting section according to the preset offshore wind turbine structural requirements and in combination with the initial pile diameter;

[0216] Constructing a radial contact pressure expression for the jacket grouting section according to the jacket grouting section size restriction table;

[0217] Determine the wall thickness of the jacket leg and the first pile diameter according to the radial contact pressure expression of the jacket grouting section;

[0218] Constructing an expression for the axial bearing capacity of the jacket grouting section according to the jacket grouting section size restriction table;

[0219] According to the expression of the axial bearing capacity of the grouting section of the jacket, the grouting leg length and the second pile diameter of the jacket are determined in combination with the first pile diameter;

[0220] The diameter of the steel pipe piles of the conductor frame is determined according to the second pile diameter.

[0221] In this embodiment, the lower root opening and steel pipe pile size calculation unit includes: a steel pipe pile length calculation subunit;

[0222] The steel pipe pile length calculation subunit is used to construct an axial bearing capacity expression and an anti-pull bearing capacity expression of the jacket according to the geological data;

[0223] According to the axial bearing capacity expression and the anti-pull bearing capacity expression, combined with the diameter of the steel pipe pile of the jacket, the preset steel pipe pile length is iteratively optimized using the dichotomy method to obtain the steel pipe pile length of the jacket.

[0224] The minimum independent size variable group calculation module 203 is used to construct the minimum independent size variable group of the jacket according to the preset offshore wind turbine structural requirements.

[0225] In this embodiment, the minimum independent size variable group calculation module 203 includes: a minimum independent size variable group calculation unit;

[0226] The minimum independent size variable group calculation unit is used to obtain the variation range of the outer diameter and wall thickness of the round pipe in the jacket according to the preset offshore wind turbine structure requirements;

[0227] According to the preset offshore wind turbine structural requirements, the upper limit of the wall thickness difference between the adjacent wall thickness segments on the main leg and the diagonal brace in the jacket is obtained;

[0228] A minimum independent size variable group of the catheter frame is constructed according to the variation range and the upper limit of the wall thickness difference.

[0229] The component cross-sectional dimension calculation module 204 is used to determine the component cross-sectional dimension of the jacket according to the minimum independent dimension variable group.

[0230] In this embodiment, the component cross-sectional dimension calculation module 204 includes: a component cross-sectional dimension calculation unit;

[0231] The component cross-sectional dimension calculation unit is used to use the minimum independent dimension variable group as a driving parameter, and to establish a calculation model in combination with a preset component maximum stress ratio, a component minimum stress ratio and a component fatigue damage target range;

[0232] Iterate and evaluate the preset initial component cross-sectional dimensions of the jacket according to the calculation model to obtain an evaluation result;

[0233] When the evaluation result meets the preset threshold requirement, the iteration of the preset initial component cross-sectional size is completed to obtain the component cross-sectional size of the conductor pipe rack.

[0234] In this embodiment, the component cross-sectional dimension calculation unit includes: a circular tube component cross-sectional dimension calculation unit;

[0235] The circular tube component cross-sectional dimension calculation unit is used for the preset initial component cross-sectional dimension to include: initial circular tube component cross-sectional dimension;

[0236] The outer diameter and the wall thickness of the initial cross-sectional dimensions of the circular tube component are iterated and evaluated in sequence according to the calculation model to obtain a wave and current load evaluation result of the initial cross-sectional dimensions of the circular tube component.

[0237] The optimal jacket construction module 205 is used to optimize and verify the components of the offshore wind turbine jacket according to the lower root opening size, steel pipe pile size and component cross-sectional size, combined with the hydrological data, geological data and rated equipment data of the offshore wind turbine, to obtain the optimal jacket of the offshore wind turbine.

[0238] In this embodiment, the optimal catheter rack construction module 205 includes: an optimal catheter rack construction unit;

[0239] The optimal jacket construction unit is used to obtain several verification indicators of the jacket of the offshore wind turbine according to the hydrological data, geological data and rated equipment data of the offshore wind turbine;

[0240] Constructing an initial jacket of an offshore wind turbine according to the lower root opening size, steel pipe pile size and component cross-sectional size;

[0241] The initial jacket is verified according to each verification index, and the lower root opening size, steel pipe pile size and component cross-sectional size are optimized according to the verification result, so that the initial jacket of the offshore wind turbine meets each verification index, and the optimal jacket of the offshore wind turbine is obtained.

[0242] This embodiment optimizes the lower root opening size and steel pipe pile size of the jacket through the geological data and rated equipment data of the offshore wind turbine, so that the lower root opening size and steel pipe pile size of the jacket are linked to the geological data and rated equipment data of the offshore wind turbine, so that the lower root opening size and steel pipe pile size of the jacket are more in line with the actual needs of the offshore wind turbine, thereby improving the accuracy of the optimization of the lower root opening size and steel pipe pile size of the jacket of the offshore wind turbine. By constructing the minimum independent size variable group, the construction size of the jacket can be fully constrained, so that the optimization of the cross-sectional size of the component is more accurate, and the accuracy of the optimization of the cross-sectional size of the component of the jacket of the offshore wind turbine is improved. Based on the hydrological data, geological data and rated equipment data of the offshore wind turbine, the most core lower root opening, steel pipe pile and cross-sectional size of the jacket of the offshore wind turbine are iteratively optimized, which improves the accuracy of the optimization of the components of the jacket of the offshore wind turbine, so that the jacket of the offshore wind turbine can better meet the operating requirements of the offshore wind turbine, ensuring the stable operation of the offshore wind turbine.

[0243] In summary, the embodiment of the present invention optimizes the lower root opening size and steel pipe pile size of the jacket through the geological data and rated equipment data of the offshore wind turbine, so that the lower root opening size and steel pipe pile size of the jacket are linked to the geological data and rated equipment data of the offshore wind turbine, so that the lower root opening size and steel pipe pile size of the jacket are more in line with the actual needs of the offshore wind turbine, thereby improving the accuracy of the optimization of the lower root opening size and steel pipe pile size of the jacket of the offshore wind turbine. By constructing the minimum independent size variable group, the construction size of the jacket can be fully constrained, so that the optimization of the cross-sectional size of the component is more accurate, and the accuracy of the optimization of the cross-sectional size of the component of the jacket of the offshore wind turbine is improved. Based on the hydrological data, geological data and rated equipment data of the offshore wind turbine, the most core lower root opening, steel pipe pile and component cross-sectional sizes in the jacket of the offshore wind turbine are iteratively optimized, which improves the accuracy of the optimization of the components of the jacket of the offshore wind turbine, so that the jacket of the offshore wind turbine obtained can better meet the operating requirements of the offshore wind turbine, ensuring the stable operation of the offshore wind turbine.

[0244] The specific embodiments described above further illustrate the purpose, technical solutions and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. It is particularly pointed out that for those skilled in the art, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the scope of protection of the present invention.

Claims

1. A component optimization method for an offshore wind turbine jacket, characterized in that: include: Obtain hydrological data, geological data and rated equipment data for offshore wind turbines; Determine the lower root opening size and steel pipe pile size of the jacket according to the geological data and rated equipment data; Construct the minimum independent size variable group of the jacket according to the preset offshore wind turbine structural requirements; Determining the cross-sectional dimensions of the components of the jacket according to the minimum independent dimension variable group; According to the lower root opening size, steel pipe pile size and component cross-sectional size, combined with the hydrological data, geological data and rated equipment data of the offshore wind turbine, the components of the offshore wind turbine jacket are optimized and verified to obtain the optimal jacket of the offshore wind turbine.

2. The component optimization method of an offshore wind turbine jacket according to claim 1, characterized in that: Determining the lower root opening size and steel pipe pile size of the jacket according to the geological data and rated equipment data specifically includes: Determine the lower root opening size of the conductor frame according to the rated equipment data; Determine the grouting leg length and leg wall thickness of the jacket according to the preset first optimization method and enumeration method, and then determine the diameter of the steel pipe pile of the jacket; Determine the length of the steel pipe piles of the jacket based on the diameter of the steel pipe piles of the jacket and in combination with the geological data; The size of the steel pipe pile of the conductor frame is obtained according to the pile diameter and the pile length of the steel pipe pile of the conductor frame.

3. The component optimization method of an offshore wind turbine jacket according to claim 2, characterized in that: The method of determining the grouting leg length and the leg wall thickness of the jacket according to the preset first optimization method and the enumeration method, and then determining the diameter of the steel pipe pile of the jacket, specifically includes: The pre-equipment pile diameter set is screened according to the enumeration method, and the offshore wind turbine frequency corresponding to the screened candidate pile diameters is verified to obtain the initial pile diameter; According to the preset first optimization method, the length and wall thickness of the slurry plug leg of the jacket are determined in combination with the initial pile diameter, and then the diameter of the steel pipe pile of the jacket is determined.

4. The component optimization method of an offshore wind turbine jacket according to claim 3, characterized in that: The method of determining the grouting leg length and leg wall thickness of the jacket according to the preset first optimization method in combination with the initial pile diameter, and then determining the diameter of the steel pipe pile of the jacket, specifically includes: Determine the size limit table of the jacket grouting section according to the preset offshore wind turbine structural requirements and in combination with the initial pile diameter; Constructing a radial contact pressure expression for the jacket grouting section according to the jacket grouting section size restriction table; Determine the wall thickness of the jacket leg and the first pile diameter according to the radial contact pressure expression of the jacket grouting section; Constructing an expression for the axial bearing capacity of the jacket grouting section according to the jacket grouting section size restriction table; According to the expression of the axial bearing capacity of the grouting section of the jacket, the grouting leg length and the second pile diameter of the jacket are determined in combination with the first pile diameter; The diameter of the steel pipe piles of the conductor frame is determined according to the second pile diameter.

5. The component optimization method of an offshore wind turbine jacket according to claim 2, characterized in that: The determining of the length of the steel pipe piles of the jacket based on the diameter of the steel pipe piles of the jacket in combination with the geological data specifically includes: Constructing an axial bearing capacity expression and an anti-pull bearing capacity expression of the jacket according to the geological data; According to the axial bearing capacity expression and the anti-pull bearing capacity expression, combined with the diameter of the steel pipe pile of the jacket, the preset steel pipe pile length is iteratively optimized using the dichotomy method to obtain the steel pipe pile length of the jacket.

6. The component optimization method of an offshore wind turbine jacket according to claim 1, characterized in that: The minimum independent size variable group of the jacket is constructed according to the preset offshore wind turbine structural requirements, specifically including: Obtain the variation range of the outer diameter and wall thickness of the round tube in the jacket according to the preset offshore wind turbine structural requirements; According to the preset offshore wind turbine structural requirements, the upper limit of the wall thickness difference between the adjacent wall thickness segments on the main leg and the diagonal brace in the jacket is obtained; A minimum independent size variable group of the catheter frame is constructed according to the variation range and the upper limit of the wall thickness difference.

7. A component optimization method for an offshore wind turbine jacket according to claim 1 or 6, characterized in that: Determining the cross-sectional dimensions of the components of the jacket according to the minimum independent dimension variable group specifically includes: The minimum independent size variable group is used as a driving parameter, and a calculation model is established in combination with a preset component maximum stress ratio, a component minimum stress ratio and a component fatigue damage target range; Iterate and evaluate the preset initial component cross-sectional dimensions of the jacket according to the calculation model to obtain an evaluation result; When the evaluation result meets the preset threshold requirement, the iteration of the preset initial component cross-sectional size is completed to obtain the component cross-sectional size of the conductor pipe rack.

8. The component optimization method of an offshore wind turbine jacket according to claim 7, characterized in that: The step of iterating and evaluating the preset initial component cross-sectional dimensions of the jacket according to the calculation model to obtain an evaluation result specifically includes: The preset initial component cross-sectional dimensions include: initial circular tube component cross-sectional dimensions; The outer diameter and the wall thickness of the initial cross-sectional dimensions of the circular tube component are iterated and evaluated in sequence according to the calculation model to obtain a wave and current load evaluation result of the initial cross-sectional dimensions of the circular tube component.

9. The component optimization method of an offshore wind turbine jacket according to claim 1, characterized in that: The method optimizes and verifies the components of the offshore wind turbine jacket according to the lower root opening size, steel pipe pile size and component cross-sectional size, combined with the hydrological data, geological data and rated equipment data of the offshore wind turbine, to obtain the optimal jacket of the offshore wind turbine, specifically including: Obtain several calibration indicators of offshore wind turbine jackets based on hydrological data, geological data and rated equipment data of offshore wind turbines; Constructing an initial jacket of an offshore wind turbine according to the lower root opening size, steel pipe pile size and component cross-sectional size; The initial jacket is verified according to each verification index, and the lower root opening size, steel pipe pile size and component cross-sectional size are optimized according to the verification result, so that the initial jacket of the offshore wind turbine meets each verification index, and the optimal jacket of the offshore wind turbine is obtained.

10. A component optimization device for an offshore wind turbine jacket, characterized in that: include: Offshore wind turbine data acquisition module, lower root opening and steel pipe pile size calculation module, minimum independent size variable group calculation module, component section size calculation module and optimal jacket construction module; Wherein, the offshore wind turbine data acquisition module is used to acquire hydrological data, geological data and rated equipment data of the offshore wind turbine; The lower root opening and steel pipe pile size calculation module is used to determine the lower root opening size and steel pipe pile size of the jacket according to the geological data and rated equipment data; The minimum independent size variable group calculation module is used to construct the minimum independent size variable group of the jacket according to the preset offshore wind turbine construction requirements; The component cross-sectional dimension calculation module is used to determine the component cross-sectional dimension of the jacket according to the minimum independent dimension variable group; The optimal jacket construction module is used to optimize and verify the components of the offshore wind turbine jacket according to the lower root opening size, steel pipe pile size and component cross-sectional size, combined with the hydrological data, geological data and rated equipment data of the offshore wind turbine, to obtain the optimal jacket of the offshore wind turbine.

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