Method and device for predicting the weight of the main structure of the monopile foundation of an offshore wind turbine

Abstract

Disclosed are a method and device for predicting the weight of a monopile foundation main structure of an offshore wind turbine. The method for predicting the weight of a monopile foundation main structure of an offshore wind turbine comprises: obtaining environmental parameters of a location where the monopile foundation main structure is to be installed; calculating the mud surface pile diameter of the monopile foundation main structure based on the environmental parameters; and predicting the weight of the monopile foundation main structure based on the mud surface pile diameter.

Description

Technical Field

[0001] The present invention relates to the field of wind power generation, and more particularly to a method and a device for predicting the weight of a main structure of a monopile foundation of an offshore wind turbine. Background Art

[0002] The monopile foundation of offshore wind turbines is the most important foundation type both at home and abroad. The design of the monopile foundation is a complex and time-consuming process. In the design (for example, as a non-limiting example, the bidding design), it is necessary to predict the weight or engineering quantity of the main structure. Usually, such predictions require the use of commercial software and require the use of a large number of parameters to calculate the structural strength, foundation deformation and whole machine frequency, which results in a very large amount of calculations. The whole process takes a very long time to complete.

[0003] However, as the early stage of the project, the design has strict requirements on the design delivery deadline. Therefore, the existing methods for designing and calculating the weight of the main structure of the monopile foundation of offshore wind turbines are difficult to meet the needs of users. Summary of the invention

[0004] The object of the present invention is to provide a method and device for predicting the weight of a main structure of a monopile foundation of an offshore wind turbine.

[0005] According to one aspect of the present invention, there is provided a method for predicting the weight of a main structure of a monopile foundation of an offshore wind turbine, the method comprising: acquiring environmental parameters of a location where the main structure of the monopile foundation will be installed; calculating a mud surface pile diameter of the main structure of the monopile foundation based on the environmental parameters; and predicting the weight of the main structure of the monopile foundation based on the mud surface pile diameter.

[0006] Optionally, the environmental parameters include one or more of water depth, wave height, wave period and flow velocity at the location.

[0007] Optionally, the environmental parameters include the wave height, wherein the step of calculating the mud surface pile diameter of the single pile foundation main structure includes: calculating the wave flow mud surface bending moment of the single pile foundation main structure based on the wave flow mud surface bending moment; calculating the mud surface load of the single pile foundation main structure based on the mud surface load; and calculating the mud surface pile diameter based on the mud surface load.

[0008] Optionally, the step of calculating the wave-flow mud surface bending moment of the single pile foundation main structure includes: obtaining the capacity of the unit to be installed on the single pile foundation main structure; determining the fitting relationship between the wave height and the wave-flow mud surface bending moment based on the capacity of the unit and the location where the single pile foundation main structure will be installed, wherein the fitting relationship between the wave height and the wave-flow mud surface bending moment is obtained based on the fitting between historical wave heights and historical wave-flow mud surface bending moments corresponding to the capacity of the unit and the location where the single pile foundation main structure will be installed; calculating the wave-flow mud surface bending moment based on the wave height and the fitting relationship between the wave height and the wave-flow mud surface bending moment.

[0009] Optionally, the fitting relationship between the wave height and the wave-flow-mud surface bending moment is an exponential function relationship, and indicates that the correlation coefficient between the wave height and the wave-flow-mud surface bending moment is greater than or equal to 0.9.

[0010] Optionally, the step of calculating the mud surface load of the single pile foundation main structure includes: obtaining the foundation top bending moment load and the foundation top horizontal force load of the single pile foundation main structure; calculating the product of the foundation top bending moment load, the foundation top horizontal force load and the distance from the foundation top to the mud surface and the sum of the wave flow mud surface bending moment as the mud surface load.

[0011] Optionally, the step of calculating the mud surface pile diameter includes: obtaining the capacity of the unit to be installed on the single pile foundation main structure; determining the fitting relationship between the mud surface load and the mud surface pile diameter based on the capacity of the unit and the location where the single pile foundation main structure will be installed, wherein the fitting relationship between the mud surface load and the mud surface pile diameter is obtained based on the fitting between historical mud surface loads and historical mud surface pile diameters corresponding to the capacity of the unit and the location where the single pile foundation main structure will be installed, and the mud surface pile diameter is calculated based on the mud surface load and the fitting relationship between the mud surface load and the mud surface pile diameter.

[0012] Optionally, the step of predicting the weight of the main structure of the single pile foundation includes: calculating the sub-mud pile length and the sub-mud wall thickness of the main structure of the single pile foundation based on the mud surface pile diameter; calculating the weight of the sub-mud part of the main structure of the single pile foundation based on the mud surface pile diameter, the sub-mud pile length and the sub-mud wall thickness; calculating the weight of the main structure of the single pile foundation based on the weight of the sub-mud part.

[0013] Optionally, the step of calculating the submerged pile length of the single pile foundation main structure includes: obtaining the capacity of the unit to be installed on the single pile foundation main structure; determining the length-to-diameter ratio based on the mud surface pile diameter, the capacity of the unit and the location where the single pile foundation main structure will be installed, and a fitting relationship between the mud surface pile diameter and the length-to-diameter ratio of the submerged part, wherein the fitting relationship between the mud surface pile diameter and the length-to-diameter ratio is obtained based on the fitting between historical mud surface pile diameters corresponding to the capacity of the unit and the location where the single pile foundation main structure will be installed and historical length-to-diameter ratios of the submerged part; and calculating the product of the mud surface pile diameter and the length-to-diameter ratio as the submerged pile length.

[0014] Optionally, the step of calculating the thickness of the submud wall of the main structure of the single pile foundation includes: obtaining the capacity of the unit to be installed on the main structure of the single pile foundation; determining the diameter-thickness ratio based on the mud surface pile diameter, the capacity of the unit and the location where the main structure of the single pile foundation will be installed, and the fitting relationship between the mud surface pile diameter and the diameter-thickness ratio of the submud part, wherein the fitting relationship between the mud surface pile diameter and the diameter-thickness ratio is obtained based on the fitting between the historical mud surface pile diameter and the historical submud wall thickness corresponding to the capacity of the unit and the location where the main structure of the single pile foundation will be installed; and calculating the ratio between the mud surface pile diameter and the diameter-thickness ratio as the submud wall thickness.

[0015] Optionally, the step of calculating the weight of the sub-mud part of the main structure of the single pile foundation includes: calculating the volume of the sub-mud part of the main structure of the single pile foundation based on the pile diameter on the mud surface, the pile length under the mud and the thick wall under the mud, wherein the shape of the sub-mud part is a circular tube; calculating the weight of the sub-mud part based on the volume of the sub-mud part and the density of the material used to construct the sub-mud part.

[0016] Optionally, the step of calculating the weight of the single pile foundation main structure also includes: obtaining the water depth of the location where the single pile foundation main structure will be installed and the foundation top diameter and foundation top height of the single pile foundation main structure; calculating the weight of the above-water part of the single pile foundation main structure based on the foundation top diameter and the foundation top height of the single pile foundation main structure; calculating the weight of the underwater part of the single pile foundation main structure based on the water depth, the foundation top diameter and the mud surface pile diameter; and calculating the sum of the weight of the above-water part, the weight of the underwater part and the weight of the sub-mud part as the weight of the single pile foundation main structure.

[0017] Optionally, the step of calculating the weight of the above-water part of the monopile foundation main structure includes: obtaining the capacity of the unit to be installed on the monopile foundation main structure; determining the diameter-thickness ratio based on the capacity of the unit, the location where the monopile foundation main structure will be installed, the foundation top diameter and the fitting relationship between the foundation top diameter and the diameter-thickness ratio of the above-water part, wherein the fitting relationship between the foundation top diameter and the diameter-thickness ratio is determined based on the fitting between the historical foundation top diameter and the historical diameter-thickness ratio of the above-water part corresponding to the capacity of the unit and the location where the monopile foundation main structure will be installed; calculating the ratio between the foundation top diameter and the diameter-thickness ratio as the above-water wall thickness of the above-water part; calculating the volume of the above-water part based on the foundation top diameter, the foundation top height and the above-water wall thickness, wherein the shape of the above-water part is a circular tube; calculating the weight of the above-water part based on the volume of the above-water part and the density of the material used to construct the above-water part.

[0018] Optionally, the step of calculating the weight of the underwater part of the main structure of the single pile foundation includes: obtaining the capacity of the unit to be installed on the main structure of the single pile foundation; determining the diameter-thickness ratio based on the capacity of the unit, the location where the main structure of the single pile foundation is to be installed, the foundation top diameter, the mud surface pile diameter and the fitting relationship between the diameter of the underwater part and the diameter-thickness ratio of the underwater part, wherein the diameter-thickness ratio is obtained based on the fitting between the historical diameter and the historical diameter-thickness ratio of the underwater part corresponding to the capacity of the unit and the location where the main structure of the single pile foundation is to be installed; calculating the underwater wall thickness of the underwater part based on the ratio between the diameter and the diameter-thickness ratio, wherein the minimum diameter of the underwater part is equal to the foundation top diameter, and the maximum diameter of the underwater part is equal to the mud surface pile diameter, wherein the shape of the underwater part is a tapered tube; calculating the volume of the underwater part based on the water depth, the foundation top diameter, the mud surface pile diameter and the underwater wall thickness; calculating the weight of the underwater part based on the volume of the underwater part and the density of the material used to build the underwater part.

[0019] According to an aspect of the present invention, there is provided a computer-readable storage medium storing a computer program, which implements any of the methods described above when executed by a processor.

[0020] According to one aspect of the present invention, there is provided a device for predicting the weight of a main structure of a monopile foundation of an offshore wind turbine, the device comprising: a processor; a memory, wherein the memory stores a computer program, and the computer program implements any of the methods described above when executed by the processor.

[0021] According to an exemplary embodiment of the present invention, since environmental parameters are taken into account to calculate the mud surface pile diameter and the calculated mud surface pile diameter is used to predict the weight of the main structure of the single pile foundation, an accurate prediction result on the weight of the main structure of the single pile foundation can be obtained, and the calculation process can be simplified and the calculation time can be saved.

[0022] According to an exemplary embodiment of the present invention, when the wave-current-mud surface bending moment is predicted based on the wave height having a high correlation with the wave-current-mud surface bending moment, an accurate prediction result can be obtained and the calculation process can be simplified.

[0023] According to an exemplary embodiment of the present invention, since the correlation between wave height and wave-current mud surface bending moment is high and the wave height is known, the fitting relationship between the wave height and the wave-current mud surface bending moment is also determined, so the wave-current mud surface bending moment can be accurately calculated using less calculation time.

[0024] According to an exemplary embodiment of the present invention, when the mud surface load is calculated based on the mud surface pile diameter having a correlation with the mud surface load, the time for calculating the mud surface load can be reduced and the mud surface load can be accurately calculated.

[0025] According to an exemplary embodiment of the present invention, since there is a correlation between the fitting relationship between the mud surface load and the mud surface pile diameter and the mud surface load is predictable, the fitting relationship between the mud surface load and the mud surface pile diameter is also determined, so the mud surface pile diameter can be accurately calculated while saving calculation time.

[0026] According to an exemplary embodiment of the present invention, the length-to-diameter ratio values ​​of the designed single pile foundations at different locations (e.g., field areas) and different unit capacities can be counted, and the average length-to-diameter ratio that varies with the pile diameter can be obtained by data fitting to represent the location and the unit capacity. Through the above method of the present invention, the pile length under the mud can be calculated based on the pile diameter on the mud surface, thereby eliminating the need to process a large amount of data such as rock and soil stratification and rock and soil parameters, reducing the calculation complexity and saving calculation time.

[0027] According to an exemplary embodiment of the present invention, the diameter-thickness ratio of the designed single pile foundation at different locations (e.g., field areas) and different unit capacities can be counted, and the average length-diameter ratio that varies with the pile diameter can be obtained by data fitting to represent the location and the unit capacity. Through the above method of the present invention, the wall thickness under the mud can be calculated based on the pile diameter on the mud surface, thereby eliminating the need to process a large amount of data for calculating the wall thickness under the mud, reducing the calculation complexity and saving calculation time.

[0028] According to an exemplary embodiment of the present invention, the diameter-thickness ratio of the monopile foundation designed at different locations (e.g., field areas) and different unit capacities can be counted, and the diameter-thickness ratio that varies with the pile diameter of the above-water part can be obtained by data fitting to represent the location and the unit capacity. Through the above method of the present invention, the wall thickness in water can be calculated based on the diameter of the above-water part, thereby reducing the calculation complexity and saving the calculation time.

[0029] According to an exemplary embodiment of the present invention, the diameter-thickness ratio of the monopile foundation designed at different locations (e.g., field areas) and different unit capacities can be counted, and the diameter-thickness ratio that varies with the pile diameter of the underwater part can be obtained by data fitting to represent the location and the unit capacity. Through the above method of the present invention, the underwater wall thickness can be calculated based on the minimum diameter and maximum diameter of the underwater part, thereby reducing the calculation complexity and saving calculation time.

[0030] According to an exemplary embodiment of the present invention, in a case where the shape of the under-mud portion is simplified as a circular pipe, the weight of the under-mud portion may be quickly predicted.

[0031] According to an exemplary embodiment of the present invention, in a case where the shape of the above-water part is simplified as a circular tube, the weight of the above-water part may be quickly predicted.

[0032] According to an exemplary embodiment of the present invention, in the case where the shape of the underwater part is simplified as a conical tube, the weight of the underwater part can be quickly predicted.

[0033] According to an exemplary embodiment of the present invention, the weight of the main structure of the offshore wind turbine monopile foundation can be predicted quickly and relatively accurately with only a small number of parameters input. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The above and other objects and features of the present invention will become more apparent through the following description in conjunction with the accompanying drawings which exemplarily illustrate an example, in which:

[0035] Figure 1 A schematic diagram showing a main structure of a monopile foundation of an offshore wind turbine according to an exemplary embodiment of the present invention;

[0036] Figure 2 A flow chart showing a method for predicting the weight of a monopile foundation main structure of an offshore wind turbine according to an exemplary embodiment of the present invention;

[0037] Figure 3 A flow chart showing a method for calculating the mud surface pile diameter of a single pile foundation main structure based on wave height according to an exemplary embodiment of the present invention;

[0038] Figure 4 A flow chart showing a method for predicting the weight of a sub-mud portion of a monopile foundation main structure according to an exemplary embodiment of the present invention;

[0039] Figure 5 A flow chart showing a method for calculating the weight of an above-water portion of a monopile foundation main structure according to an exemplary embodiment of the present invention;

[0040] Figure 6 A flow chart showing a method for calculating the weight of an underwater portion of a monopile foundation main structure according to an exemplary embodiment of the present invention is shown;

[0041] Figure 7 A schematic diagram showing a method for predicting the weight of a main structure of a monopile foundation of an offshore wind turbine according to an exemplary embodiment of the present invention;

[0042] Figure 8 A block diagram showing an apparatus for predicting the weight of a main structure of a monopile foundation of an offshore wind turbine according to an exemplary embodiment of the present invention. DETAILED DESCRIPTION

[0043] Hereinafter, various exemplary embodiments will be described in detail with reference to the accompanying drawings. These exemplary embodiments are provided to specifically describe the technical ideas of the inventive concept, but are not intended to restrict the scope of the inventive concept. It should be understood that all modifications that can be easily obtained by those skilled in the art from this specification and these exemplary embodiments fall within the scope of the inventive concept.

[0044] It will be understood that when the term “comprising” is used in this specification, it specifies the presence of stated features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups thereof.

[0045] It will also be understood that although the terms "first", "second", "third", etc. may be used herein to describe various elements, components, regions, layers and / or parts, these elements, components, regions, layers and / or parts should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or part from another element, component, region, layer or part. As used herein, the term "and / or" includes any and all combinations of one or more related listed items. When a statement such as "at least one of..." follows a column of elements, the statement modifies the entire column of elements, rather than modifying a single element of the column.

[0046] Figure 1 A schematic diagram showing a main structure of a monopile foundation of an offshore wind turbine according to an exemplary embodiment of the present invention.

[0047] In the present invention, the main structure of the monopile foundation of the offshore wind turbine can be roughly simplified as follows: Figure 1A hollow round steel pipe as shown. Generally, considering the actual manufacturing process, a section of rolled plate can be connected (for example, butt welding) at predetermined lengths (for example, 2-3m as a non-limiting example) along the pile length direction of the monopile foundation main structure of the offshore wind turbine. The wall thickness of each section of rolled plate will be determined separately according to the design. Therefore, the weight of each section of rolled plate needs to be accumulated to accurately calculate the weight of the monopile foundation main structure.

[0048] Reference Figure 1 , according to the change in diameter, the main structure of the single pile foundation can be divided into three sections of steel pipe: the straight section above water (also called the above-water part), the conical section in water (also called the underwater part) and the straight section under mud (also called the under-mud part); and the outer diameter of the connection between the two adjacent sections remains the same. Although the actual single pile foundation does not necessarily strictly change the diameter at the water surface and the mud surface, the above approximation can characterize the general shape. In addition, the wall thickness of adjacent coils often varies, but for each section of steel pipe, the weighted average diameter-to-thickness ratio (the ratio of diameter to wall thickness) is a value that can be statistically and easily estimated. After obtaining the weighted average diameter-to-thickness ratio, the weighted average wall thickness can be determined according to the diameter. For the prediction of the weight of the main structure of the single pile foundation in the early stage of the project such as bidding, the above approximation of the shape and wall thickness of the single pile foundation is feasible.

[0049] exist Figure 1 In the embodiment, the above-water straight section may be the portion of the main structure of the monopile foundation located between the water surface and the foundation top, and may have a vertical length L1 and a pile diameter D1 on the water surface. The underwater conical section may be the portion of the main structure of the monopile foundation located between the water surface and the mud surface, and may have a vertical length L2 and a diameter between the pile diameter D1 on the water surface and the pile diameter D3 on the mud surface. The sub-mud straight section may be the portion of the main structure of the monopile foundation located below the mud surface (i.e., between the mud surface and the pile end), and may have a vertical length L3 and a pile diameter D3 on the mud surface.

[0050] exist Figure 1 In the main structure of the monopile foundation shown in FIG, the diameter of the foundation top and the diameter of the straight section of the main structure of the monopile foundation under the mud (also called the pile diameter on the mud surface) are key parameters for determining the weight of the main structure of the monopile foundation. Usually, the diameter of the foundation top can be known, but it is often difficult to obtain the pile diameter on the mud surface. Therefore, how to obtain the pile diameter on the mud surface is the key to predicting the weight of the main structure of the monopile foundation of an offshore wind turbine.

[0051] Figure 2 A flow chart showing a method for predicting the weight of a main structure of a monopile foundation of an offshore wind turbine according to an exemplary embodiment of the present invention.

[0052] Reference Figure 2 In operation S210, environmental parameters of a location where a main structure of a monopile foundation is to be installed may be acquired.

[0053] Here, environmental parameters can be parameter values ​​of one or more environmental factors that affect the main structure of the monopile foundation. In one embodiment, environmental parameters may include one or more of the water depth, wave height, wave period and flow rate of the location where the main structure of the monopile foundation will be installed. The water depth may indicate the depth of the seawater at the location where the main structure of the monopile foundation will be installed (for example, only as an example, considering the machine position water depth of the flushing). The wave height at the location where the main structure of the monopile foundation will be installed may indicate the vertical distance between the adjacent crests and troughs of the waves at the location where the main structure of the monopile foundation will be installed. The wave period at the location where the main structure of the monopile foundation will be installed may indicate the period of the waves at the location where the main structure of the monopile foundation will be installed. The flow rate at the location where the main structure of the monopile foundation will be installed may indicate the flow rate of the seawater at the location where the main structure of the monopile foundation will be installed. In addition, the location where the main structure of the monopile foundation will be installed is not limited to the same location, but may indicate, for example, a demarcated area (only as a non-limiting example, a province, a seaside city and / or an island).

[0054] In operation S220, a pile diameter on the mud surface of the main structure of the single pile foundation may be calculated based on the environmental parameters.

[0055] In the present invention, by fitting between a large number of parameters including environmental parameters and mud pile diameter, it is found that environmental parameters are an important factor affecting the mud pile diameter of the main structure of the monopile foundation. For example, when fitting between a first parameter (e.g., environmental parameter) and a second parameter (e.g., mud pile diameter) among a large number of parameters, other variables or parameters (e.g., the location where the main structure of the monopile foundation is installed and the capacity of the unit installed on the main structure of the monopile foundation, etc.) different from the first parameter and the second parameter can be controlled to be the same or similar. In other words, there may be a correlation between the environmental parameters and the mud pile diameter of the main structure of the monopile foundation. Therefore, when the environmental parameters are obtained, it is possible to calculate the mud pile diameter of the main structure of the monopile foundation based on the obtained environmental parameters and the correlation between the mud pile diameter and the environmental parameters.

[0056] In a preferred embodiment, the environmental parameters may include the wave height of the location where the main structure of the single pile foundation is to be installed. In this embodiment, by fitting the wave height and the mud pile diameter (e.g., the historical wave height and the historical mud pile diameter) (e.g., to form a fitting relationship curve or calculate a fitting function), it can be found that there is a high correlation between the wave height and the mud pile diameter. Therefore, when the mud pile diameter is predicted based on the wave height, an accurate prediction result can be obtained, and the calculation process can be simplified. In one example, the wave height can be a 1% wave height once in 50 years. However, the wave height of the present invention is not limited to this, and can be any other wave height (e.g., as an example only, a 1% wave height once in 5 years, a 1% wave height once in 100 years).

[0057] Here, it is noted that when fitting between wave height and mud pile diameter, other variables or parameters (for example, the location where the monopile foundation main structure is installed and the capacity of the unit installed on the monopile foundation main structure, etc.) can be controlled to be the same or similar.

[0058] Will be combined later Figure 3 A method for calculating the pile diameter on the mud surface of the main structure of a single pile foundation based on wave height is described in more detail.

[0059] In operation S230 , the weight of the main structure of the single pile foundation may be predicted based on the pile diameter on the mud surface.

[0060] As reference Figure 1 As stated in Figure 1 In the main structure of the monopile foundation shown in FIG, the diameter of the foundation top and the mud surface pile diameter of the mud-under-sliding straight section of the main structure of the monopile foundation are key parameters for determining the weight of the main structure of the monopile foundation. Generally, the diameter of the foundation top can be known, but it is often difficult to obtain the mud surface pile diameter. Therefore, the mud surface pile diameter is the key to predicting the weight of the main structure of the monopile foundation of an offshore wind turbine. That is, the weight of the main structure of the monopile foundation can be predicted by the mud surface pile diameter obtained in operation S230.

[0061] In the present invention, since environmental parameters are taken into consideration to calculate the mud surface pile diameter and the calculated mud surface pile diameter is used to predict the weight of the main structure of the single pile foundation, an accurate prediction result on the weight of the main structure of the single pile foundation can be obtained, and the calculation process can be simplified and the calculation time can be saved.

[0062] Figure 3 A flow chart showing a method for calculating a pile diameter on a mud surface of a main structure of a monopile foundation based on wave height according to an exemplary embodiment of the present invention.

[0063] Generally, the mud pile diameter D3 may be positively correlated with the mud surface load. The mud surface load may include horizontal force and bending moment. From the force characteristics of the offshore wind turbine single pile foundation, the bending moment is the control load. In one example, the following formula (1) can be obtained based on the bending moment calculation formula of the fixed end of the cantilever beam:

[0064]

[0065] Among them, M wind The bending moment of the fan load on the foundation top is equal to the input parameter foundation top bending moment load Mxy; F wind L is the horizontal force of the foundation top fan load, which is equal to the input parameter foundation top horizontal force load Fxy; wind is the force arm of the wind turbine load, which is the distance from the top of the foundation to the mud surface, equal to the sum of the top elevation of the foundation (i.e., the vertical height of the above-water part) and the water depth of the turbine position. wind 、Fwind and L wind can be directly determined based on the input parameters. In other words, the above data can be regarded as known parameters. wave¤t is the layered wave and current load, L wave¤t is the corresponding arm length. Usually, the moment load is calculated (also known as wave-flow mud surface bending moment) is difficult and inconvenient.

[0066] Reference Figure 3 In operation S310, the wave flow mud surface bending moment of the main structure of the monopile foundation may be calculated based on the wave height.

[0067] In one embodiment, the fitting relationship between the wave height and the wave-flow mud surface bending moment (for example, the historical wave height and the historical wave-flow mud surface bending moment) can be obtained by fitting (for example, to form a fitting relationship curve or calculate a fitting function). Through the above fitting, it can be found that there is a high correlation between the wave height and the wave-flow mud surface bending moment. Therefore, when the wave-flow mud surface bending moment is predicted based on the wave height that has a high correlation with the wave-flow mud surface bending moment, an accurate prediction result can be obtained, and the calculation process can be simplified.

[0068] More specifically, in order to calculate the wave flow mud surface bending moment of the monopile foundation main structure, the capacity of the unit to be installed on the monopile foundation main structure can be first obtained. In other words, the capacity of the unit to be installed on the monopile foundation main structure can be a known parameter.

[0069] Afterwards, the fitting relationship between the wave height and the wave-flow mud surface bending moment may be determined based on the capacity of the unit and the location where the main structure of the monopile foundation will be installed. In one example, when the capacity of the unit is different, the fitting relationship between the wave height and the wave-flow mud surface bending moment may be different from each other. In another example, when the location where the main structure of the monopile foundation will be installed is different, the fitting relationship between the wave height and the wave-flow mud surface bending moment may be different from each other. However, the above examples are merely exemplary, and the present invention is not limited thereto.

[0070] For example, the fitting relationship between the wave height and the wave-flow mud surface bending moment can be obtained based on the fitting between the historical wave height and the historical wave-flow mud surface bending moment corresponding to the capacity of the unit and the location where the monopile foundation main structure is to be installed. In other words, the fitting relationship between the wave height and the wave-flow mud surface bending moment can be obtained based on the fitting between the historical wave height and the historical wave-flow mud surface bending moment when the capacity of the unit and the location where the monopile foundation main structure is to be installed are fixed values.

[0071] In a non-limiting example, in the fitting relationship curve between wave height and wave-flow mud surface bending moment, the correlation coefficient between wave height and wave-flow mud surface bending moment can reach above 0.9, and present an exponential functional relationship. However, the above correlation coefficient and exponential functional relationship between wave height and wave-flow mud surface bending moment are only used to illustrate that the correlation between wave height and wave-flow mud surface bending moment is high, and are not used to limit the present invention. That is, the correlation coefficient and functional relationship between wave height and wave-flow mud surface bending moment of the present invention are not limited to 0.9 and exponential functional relationship.

[0072] Subsequently, the wave-current-mud surface bending moment can be calculated based on the wave height and the fitting relationship between the wave height and the wave-current-mud surface bending moment.

[0073] Since the wave height and the wave-current mud surface bending moment have a high correlation and the wave height is known, the fitting relationship between the wave height and the wave-current mud surface bending moment is also determined, so the wave-current mud surface bending moment can be accurately calculated using less computing time.

[0074] In operation S320, the mud surface load of the main structure of the single pile foundation is calculated based on the wave-current mud surface bending moment.

[0075] In one example, the mud surface load of the main structure of the single pile foundation can be calculated based on the above formula (1). That is, the mud surface load can be calculated by obtaining the foundation top bending moment load and foundation top horizontal force load of the main structure of the single pile foundation, and the product of the foundation top bending moment load, the foundation top horizontal force load and the distance from the foundation top to the mud surface and the sum of the wave flow mud surface bending moment.

[0076] In operation S330 , a mud surface pile diameter may be calculated based on the mud surface load.

[0077] As described above, the mud surface pile diameter may be positively correlated with the mud surface load. Therefore, in one embodiment, the fitting relationship between the mud surface load and the mud surface pile diameter (e.g., historical mud surface load and historical mud surface pile diameter) may be obtained by fitting (e.g., to form a fitting relationship curve or calculate a fitting function). Through the above fitting, it can be found that there is a correlation between the mud surface pile diameter and the mud surface load. Therefore, when the mud surface pile diameter is calculated based on the mud surface load that is correlated with the mud surface pile diameter, the time for calculating the mud surface pile diameter can be reduced, and the mud surface pile diameter can be accurately calculated.

[0078] More specifically, in order to calculate the pile diameter of the monopile foundation main structure, the capacity of the unit to be installed on the monopile foundation main structure may be first obtained. In other words, the capacity of the unit to be installed on the monopile foundation main structure may be a known parameter.

[0079] Afterwards, the fitting relationship between the mud surface load and the mud surface pile diameter may be determined based on the capacity of the unit and the location where the main structure of the monopile foundation will be installed. In one example, when the capacity of the unit is different, the fitting relationship between the mud surface load and the mud surface pile diameter may be different from each other. In another example, when the location where the main structure of the monopile foundation will be installed is different, the fitting relationship between the mud surface load and the mud surface pile diameter may be different from each other. However, the above examples are merely exemplary, and the present invention is not limited thereto.

[0080] For example, the fitting relationship between the mud surface load and the mud surface pile diameter can be obtained based on the fitting between the historical mud surface load and the historical mud surface pile diameter corresponding to the capacity of the unit and the location where the main structure of the monopile foundation is to be installed. In other words, the fitting relationship between the mud surface load and the mud surface pile diameter can be obtained based on the fitting between the historical mud surface load and the historical mud surface pile diameter when the capacity of the unit and the location where the main structure of the monopile foundation is to be installed are fixed values.

[0081] Subsequently, the mud surface pile diameter can be calculated based on the fitting relationship between the mud surface load and the mud surface pile diameter.

[0082] Since there is a correlation between the fitting relationship between the mud surface load and the mud surface pile diameter and the mud surface load can be determined by the method of the present invention, the fitting relationship between the mud surface load and the mud surface pile diameter is also determined, so the mud surface pile diameter can be accurately calculated while saving calculation time.

[0083] Although Figure 3 A method for calculating the mud surface pile diameter of the main structure of the single pile foundation based on wave height is shown, but the present invention is not limited thereto. For example, the mud surface pile diameter of the main structure of the single pile foundation may be calculated based on at least one of water depth, wave height, wave period, and flow velocity. The method for calculating the mud surface pile diameter of the main structure of the single pile foundation based on at least one of water depth, wave height, wave period, and flow velocity may be the same as or similar to the method for calculating the mud surface pile diameter of the main structure of the single pile foundation based on wave height.

[0084] Figure 4 A flow chart showing a method of predicting the weight of a sub-mud portion of a monopile foundation main structure according to an exemplary embodiment of the present invention.

[0085] Referring to FIG. 4 , in operation S410 , the pile length under the mud and the wall thickness under the mud of the main structure of the single pile foundation may be calculated based on the pile diameter on the mud surface.

[0086] Generally, unlike the long and thin piles of offshore oil and gas platforms, the single pile foundation of offshore wind power is a large diameter rigid pile, and the length-to-diameter ratio can be within a range (for example, a relatively narrow range). In addition to the pile diameter and environmental load, the length-to-diameter ratio can also be directly related to the stratification of rock and soil and the strength of each layer of soil. In other words, the length-to-diameter ratio can be affected by many factors, which makes it difficult to calculate the length-to-diameter ratio. Similarly, the thickness of the mud wall of the main structure of the single pile foundation is also affected by many factors, which makes it inconvenient to calculate the thickness of the mud wall.

[0087] In one embodiment, in order to calculate the sub-mud pile length of the monopile foundation main structure, the capacity of the unit to be installed on the monopile foundation main structure may be obtained. Afterwards, the length-to-diameter ratio of the sub-mud portion may be determined based on the pile diameter on the mud surface, the capacity of the unit, the location where the monopile foundation main structure is to be installed, and the fitting relationship between the pile diameter on the mud surface and the length-to-diameter ratio. As a non-limiting example only, the length-to-diameter ratio may be between 5 and 8. However, the length-to-diameter ratio is not limited to 5 to 8, and may be any other value.

[0088] For example, the fitting relationship between the mud surface pile diameter and the length-to-diameter ratio is obtained based on the fitting between the historical mud surface pile diameter and the historical length-to-diameter ratio of the mud-underneath portion corresponding to the capacity of the unit and the location where the main structure of the monopile foundation will be installed. That is, the fitting relationship between the mud surface pile diameter and the length-to-diameter ratio can be obtained based on the fitting between the historical mud surface pile diameter and the historical length-to-diameter ratio of the mud-underneath portion when the capacity of the unit and the location where the main structure of the monopile foundation will be installed are fixed values. In one example, when the capacity of the unit is different, the fitting relationship between the mud surface pile diameter and the length-to-diameter ratio may be different from each other. In another example, when the location where the main structure of the monopile foundation will be installed is different, the fitting relationship between the mud surface pile diameter and the length-to-diameter ratio may be different from each other. However, the above examples are merely exemplary, and the present invention is not limited thereto.

[0089] Afterwards, the product between the pile diameter on the mud surface and the length-to-diameter ratio was calculated as the pile length under the mud.

[0090] That is, in the present invention, the length-to-diameter ratio values ​​of the designed single pile foundations at different locations (e.g., field areas) and different unit capacities can be counted, and the average length-to-diameter ratio that varies with the pile diameter can be obtained by data fitting to represent the location and the unit capacity. Through the above method of the present invention, the pile length under the mud can be calculated based on the pile diameter on the mud surface, thereby eliminating the need to process a large amount of data such as rock and soil stratification and rock and soil parameters, reducing the calculation complexity and saving calculation time.

[0091] Similarly, in order to calculate the wall thickness under the mud of the main structure of the monopile foundation, the capacity of the unit to be installed on the main structure of the monopile foundation can be obtained. Then, the diameter-thickness ratio of the part under the mud can be determined based on the pile diameter on the mud surface, the capacity of the unit, the location where the main structure of the monopile foundation will be installed, and the fitting relationship between the pile diameter on the mud surface and the diameter-thickness ratio.

[0092] For example, the fitting relationship between the mud surface pile diameter and the diameter-thickness ratio is obtained based on the fitting between the historical mud surface pile diameter and the historical diameter-thickness ratio of the mud lower part corresponding to the capacity of the unit and the location where the main structure of the single pile foundation will be installed. That is, the fitting relationship between the mud surface pile diameter and the diameter-thickness ratio can be obtained based on the fitting between the historical mud surface pile diameter and the historical diameter-thickness ratio of the mud lower part when the capacity of the unit and the location where the main structure of the single pile foundation will be installed are fixed values. In one example, when the capacity of the unit is different, the fitting relationship between the mud surface pile diameter and the diameter-thickness ratio may be different from each other. In another example, when the location where the main structure of the single pile foundation will be installed is different, the fitting relationship between the mud surface pile diameter and the diameter-thickness ratio may be different from each other. However, the above examples are merely exemplary, and the present invention is not limited thereto.

[0093] Afterwards, the ratio between the pile diameter at the mud surface and the diameter-to-thickness ratio can be calculated as the wall thickness under the mud.

[0094] That is, in the present invention, the diameter-thickness ratio of the designed single pile foundation at different locations (e.g., field areas) and different unit capacities can be counted, and the average length-diameter ratio that varies with the pile diameter can be obtained by data fitting to represent the location and the unit capacity. Through the above method of the present invention, the wall thickness under the mud can be calculated based on the pile diameter on the mud surface, thereby eliminating the need to process a large amount of data for calculating the wall thickness under the mud, reducing the calculation complexity and saving calculation time.

[0095] In operation S420, the weight of the sub-mud portion of the main structure of the single pile foundation may be calculated based on the pile diameter on the mud surface, the pile length under the mud, and the wall thickness under the mud.

[0096] First, the volume of the subsoil part of the main structure of the single pile foundation can be calculated based on the pile diameter on the mud surface, the pile length under the mud, and the thickness of the wall under the mud, where the shape of the subsoil part is a circular tube. For example, the shape of the subsoil part can be referenced to Figure 1 When the shape of the under-mud part is simplified to a round tube, the weight of the under-mud part can be quickly predicted.

[0097] Afterwards, the weight of the lower mud portion may be calculated based on the volume of the lower mud portion and the density of the material used to construct the lower mud portion. More specifically, the weight of the lower mud portion may be calculated by multiplying the volume of the lower mud portion by the density of the material used to construct the lower mud portion.

[0098] Return to reference Figure 1 The weight of the submerged part is an important part of the weight of the main structure of the monopile foundation, and it will affect the weight of the above-water part and the weight of the underwater part. Therefore, the weight of the submerged part is the key to calculating the weight of the main structure of the monopile foundation.

[0099] Here, the weight of the main structure of the monopile foundation may include the weight of the above-water part, the weight of the underwater part and the weight of the submerged part. In other words, the sum of the weight of the above-water part, the weight of the underwater part and the weight of the submerged part may be calculated as the weight of the main structure of the monopile foundation.

[0100] In one example, the weight of the above-water portion may be calculated based on the foundation top diameter and foundation top height of the main structure of the monopile foundation. For example, the foundation top diameter and foundation top height of the main structure of the monopile foundation may be obtained as known parameters. Figure 5 The method of calculating the weight of the above-water portion is described in more detail.

[0101] In addition, the weight of the underwater part of the monopile foundation main structure is calculated based on the water depth, foundation top diameter and mud pile diameter of the location where the monopile foundation main structure is to be installed. For example, the water depth and foundation top diameter of the location where the monopile foundation main structure is to be installed can be obtained as known parameters, and the mud pile diameter can be obtained using reference Figures 2 to 3 At least one method and / or step described is used to calculate. Figure 6 The method of calculating the weight of the portion in water is described in more detail.

[0102] More specifically, combined with Figure 1 , the weight of the main structure of the single pile foundation can be calculated by the following equation (2):

[0103] W=w 水上直段 (D1,L1,t1) + w 水中锥段 (D1&D3,L2,t2) + w 泥下直段 (D3, L3, t3) (2)

[0104] In the above equation (2), D1 represents the pile diameter on the water surface, L1 represents the length above the water, t1 represents the wall thickness above the water, L2 represents the length in the water, t2 represents the wall thickness in the water; D3 represents the pile diameter on the mud surface, L3 represents the length under the mud, t3 represents the wall thickness under the mud, w 水上直段 Indicates the weight of the above-water part, w 水中锥段 (D1&D3, L2, t2) represents the weight of the cone in water, w 泥下直段 (D3, L3, t3) represents the weight of the straight section under the mud.

[0105] Figure 5A flow chart illustrating a method of calculating the weight of an above-water portion of a monopile foundation main structure according to an exemplary embodiment of the present invention.

[0106] In operation S510, the capacity of the unit installed on the main structure of the monopile foundation and the foundation top diameter of the main structure of the monopile foundation may be acquired.

[0107] In operation S520, the diameter-thickness ratio may be determined based on the capacity of the unit, the location where the monopile foundation main structure will be installed, the foundation top diameter, and a fitting relationship between the foundation top diameter and the diameter-thickness ratio of the above-water portion.

[0108] For example, the fitting relationship between the foundation top diameter and the diameter-thickness ratio can be obtained based on the fitting between the historical foundation top diameter and the historical diameter-thickness ratio of the above-water part corresponding to the capacity of the unit and the location where the main structure of the monopile foundation will be installed. That is, the fitting relationship between the diameter of the above-water part and the diameter-thickness ratio can be obtained based on the fitting between the historical diameter and the historical diameter-thickness ratio of the above-water part when the capacity of the unit and the location where the main structure of the monopile foundation will be installed are fixed values. In one example, when the capacity of the unit is different, the fitting relationship between the diameter of the above-water part and the diameter-thickness ratio may be different from each other. In another example, when the location where the main structure of the monopile foundation will be installed is different, the fitting relationship between the foundation top diameter and the diameter-thickness ratio may be different from each other. However, the above examples are merely exemplary, and the present invention is not limited thereto. In addition, for example, the diameter of the above-water part may represent the average value of the minimum diameter and the maximum diameter of the above-water part.

[0109] As a non-limiting example only, the diameter-to-thickness ratio may be between 80 and 120, and the larger the diameter, the larger the diameter-to-thickness ratio. However, the present invention is not limited thereto, and the diameter-to-thickness ratio may also vary according to actual conditions.

[0110] Here, the method and principle of determining the diameter-to-thickness ratio of the above-water portion may be the same as or similar to the method and principle of determining the diameter-to-thickness ratio of the below-mud portion.

[0111] In operation S530, a ratio between the diameter of the above-water portion and the diameter-to-thickness ratio may be calculated as the underwater wall thickness of the above-water portion.

[0112] That is, in the present invention, the diameter-thickness ratio of the designed single pile foundation at different locations (e.g., field areas) and different unit capacities can be counted, and the diameter-thickness ratio that varies with the pile diameter of the above-water part can be obtained by data fitting to represent the location and the unit capacity. Through the above method of the present invention, the wall thickness in water can be calculated based on the diameter of the above-water part, thereby reducing the calculation complexity and saving the calculation time.

[0113] In operation S540, the volume of the above-water portion may be calculated based on the foundation top diameter, the foundation top height, and the above-water wall thickness, wherein the shape of the above-water portion is a circular tube.

[0114] More specifically, the shape of the above-water portion can be referenced Figure 1 The circular tube shown. If the foundation top diameter, foundation top height and above-water wall thickness are known, the volume of the above-water portion can be easily calculated.

[0115] In operation S550, the weight of the above-water part may be calculated based on the volume of the above-water part and the density of the material used to construct the above-water part.

[0116] More specifically, the weight of the above-water portion may be calculated by multiplying the volume of the above-water portion by the density of the material used to construct the above-water portion.

[0117] Figure 6 A flow chart illustrating a method of calculating the weight of an underwater portion of a monopile foundation main structure according to an exemplary embodiment of the present invention is shown.

[0118] In operation S610, the capacity of the unit installed on the main structure of the monopile foundation and the foundation top diameter of the main structure of the monopile foundation may be acquired.

[0119] In operation S620, the diameter-thickness ratio may be determined based on the capacity of the unit, the location where the monopile foundation main structure is to be installed, the foundation top diameter, the mud surface pile diameter, and the fitting relationship between the diameter of the underwater portion and the diameter-thickness ratio of the underwater portion.

[0120] For example, the fitting relationship between the diameter of the underwater part and the diameter-thickness ratio of the underwater part can be obtained based on the fitting between the historical diameter and the historical diameter-thickness ratio of the underwater part corresponding to the capacity of the unit and the location where the main structure of the monopile foundation will be installed. That is, the fitting relationship between the foundation top diameter and the diameter-thickness ratio can be obtained based on the fitting between the historical foundation top diameter and the historical diameter-thickness ratio of the upper and lower parts of the water when the capacity of the unit and the location where the main structure of the monopile foundation will be installed are fixed values. In one example, when the capacity of the unit is different, the fitting relationship between the foundation top diameter and the diameter-thickness ratio may be different from each other. In another example, when the location where the main structure of the monopile foundation will be installed is different, the fitting relationship between the foundation top diameter and the diameter-thickness ratio may be different from each other. However, the above examples are only exemplary, and the present invention is not limited thereto. In addition, for example, the diameter of the underwater part can represent the average value of the minimum diameter and the maximum diameter of the underwater part. However, the diameter of the underwater part is not limited thereto, and can also be a weighted average of the minimum diameter and the maximum diameter of the underwater part, or can represent the diameter of a specific depth of the underwater part.

[0121] In other words, the method and principle of determining the diameter-to-thickness ratio of the underwater portion may be the same as or similar to the method and principle of determining the diameter-to-thickness ratio of the above-water portion.

[0122] In operation 630 , a ratio between a diameter of the underwater portion and a diameter-to-thickness ratio may be calculated as an underwater wall thickness of the underwater portion.

[0123] That is, in the present invention, the diameter-thickness ratio of the main structure of the single pile foundation designed at different locations (e.g., field areas) and different unit capacities can be counted, and the diameter-thickness ratio that varies with the pile diameter of the underwater part can be obtained by data fitting to represent the location and the unit capacity. Through the above method of the present invention, the underwater wall thickness can be calculated based on the minimum diameter (i.e., the foundation top diameter) and the maximum diameter (i.e., the pile diameter on the mud surface) of the underwater part, thereby reducing the calculation complexity and saving the calculation time.

[0124] In operation S640, the volume of the underwater portion may be calculated based on the water depth, the foundation top diameter, the mud surface pile diameter, and the underwater wall thickness.

[0125] More specifically, the shape of the part in the water can be used as a reference Figure 1 The volume of the above-water portion can be easily calculated by knowing the water depth, the diameter of the foundation top, the diameter of the pile on the mud surface and the wall thickness in the water.

[0126] In operation S650, the weight of the underwater part may be calculated based on the volume of the underwater part and the density of a material used to construct the underwater part.

[0127] More specifically, the weight of the submerged portion may be calculated by multiplying the volume of the submerged portion by the density of the material used to construct the submerged portion.

[0128] Figure 7 A schematic diagram showing a method for predicting the weight of a main structure of a monopile foundation of an offshore wind turbine according to an exemplary embodiment of the present invention.

[0129] Reference Figure 7 , a plurality of known input parameters (i.e., environmental and design parameters) may be first obtained. For example, the input parameters may include the location where the monopile foundation main structure will be installed, the capacity of the unit to be installed on the monopile foundation main structure, the foundation top bending moment load of the monopile foundation main structure, the foundation top horizontal force load of the monopile foundation main structure, the machine position water depth of the location where the monopile foundation main structure will be installed, the wave height of the location where the monopile foundation main structure will be installed, the foundation top elevation of the monopile foundation main structure, and the foundation top diameter of the monopile foundation main structure.

[0130] exist Figure 7In step a, the mud surface load can be calculated by the foundation top bending moment load, foundation top horizontal force load, machine position water depth and wave-flow mud surface bending moment. For example, the mud surface load can be equal to the product of the foundation top bending moment load, the foundation top horizontal force load and the distance from the foundation top to the mud surface (that is, the sum of the foundation top elevation and the machine position water depth), and the sum of the wave-flow mud surface bending moment. The wave-flow mud surface bending moment can be calculated by the wave height. For example, the fitting relationship between the wave height and the wave-flow mud surface bending moment can be obtained by fitting the historical wave height and the historical wave-flow mud surface bending moment. The historical wave height and the historical wave-flow mud surface bending moment here can be obtained when the location where the main structure of the single pile foundation will be installed and the capacity of the unit to be installed on the main structure of the single pile foundation are fixed values. Then, the wave-flow mud surface bending moment can be calculated based on the input parameter "wave height" and the fitting relationship.

[0131] exist Figure 7 In step b, the mud surface pile diameter can be calculated based on the mud surface load. For example, the fitting relationship between the mud surface load and the mud surface pile diameter can be obtained by fitting the historical mud surface load and the historical mud surface pile diameter. The historical mud surface load and the historical mud surface pile diameter here can be obtained when the location where the main structure of the monopile foundation is to be installed and the capacity of the unit to be installed on the main structure of the monopile foundation are fixed values. Then, the mud surface pile diameter can be calculated based on the mud surface load calculated in step a and the fitting relationship.

[0132] exist Figure 7 In step c, the submerged pile length can be calculated based on the mud surface pile diameter. For example, the fitting relationship between the mud surface pile diameter and the submerged pile length can be obtained by fitting the historical mud surface pile diameter and the historical submerged pile length. The historical mud surface pile diameter and the historical submerged pile length here can be obtained when the location where the main structure of the monopile foundation will be installed and the capacity of the unit to be installed on the main structure of the monopile foundation are fixed values. Then, the submerged pile length can be calculated based on the mud surface pile diameter calculated in step b and the fitting relationship.

[0133] and Figure 7 Similar to step c, the mud surface pile diameter can also be used to calculate the wall thickness under the mud and the wall thickness under the water. For example, the fitting relationship between the mud surface pile diameter and the wall thickness under the mud can be obtained by fitting the historical mud surface pile diameter and the historical wall thickness under the mud. The historical mud surface pile diameter and the historical wall thickness under the mud here can be obtained when the location where the main structure of the single pile foundation will be installed and the capacity of the unit to be installed on the main structure of the single pile foundation are fixed values. Then, the pile length under the mud can be calculated based on the mud surface pile diameter calculated in step b and the fitting relationship. The wall thickness in the water can also be calculated using a similar principle.

[0134] exist Figure 7In the calculation, the pile diameter on the water surface can be equal to the input parameter "foundation top diameter", the length above water can be equal to the input parameter "foundation top elevation", and the length in water can be equal to the input parameter "machine position water depth".

[0135] At this point, references have been obtained Figure 7 The parameters of the shape of the main structure of the single pile foundation are described (i.e., pile diameter on the water surface, length above water, length in water, pile diameter on the mud surface, pile length under mud, wall thickness under mud, wall thickness in water, and wall thickness above water). Therefore, the weight above water, weight in water, and weight under mud of the main structure of the single pile foundation can be calculated respectively, thereby obtaining the weight of the main structure of the single pile foundation (i.e., weight of the single pile foundation).

[0136] More specifically, the weight above water of the main structure of the monopile foundation can be the product of the volume of the above water part regarded as a circular tube and the density of the material used to build the above water part. The volume of the above water part can be easily determined based on the surface pile diameter, the length above water and the wall thickness above water. The weight in water of the main structure of the monopile foundation can be the product of the volume of the underwater part regarded as a cone tube and the density of the material used to build the underwater part. The volume of the underwater part can be easily determined based on the surface pile diameter, the length below water, the wall thickness below water and the pile diameter below mud. The weight below mud of the main structure of the monopile foundation can be the product of the volume of the below mud part regarded as a circular tube and the density of the material used to build the below mud part. The volume of the below mud part can be easily determined based on the length below mud, the wall thickness below mud and the pile diameter below mud.

[0137] According to the method for predicting the weight of the main structure of the monopile foundation of an offshore wind turbine of the present invention, the weight of the main structure of the monopile foundation of an offshore wind turbine can be predicted quickly and relatively accurately with only a small number of parameters to be input.

[0138] Figure 8 A block diagram showing an apparatus for predicting the weight of a main structure of a monopile foundation of an offshore wind turbine according to an exemplary embodiment of the present invention.

[0139] Reference Figure 8 According to an exemplary embodiment of the present invention, the device 800 for predicting the weight of the main structure of the monopile foundation of an offshore wind turbine may include a processor 810 and a memory 820. Here, the memory 820 stores a computer program, wherein the computer program is executed by the processor 810 to implement the reference Figures 1 to 7 For simplicity, the reference method executed by the processor 810 is not repeated here. Figures 1 to 7 at least one of the methods described.

[0140] In addition, the microgrid protection method according to the exemplary embodiment of the present invention can be implemented as a computer program in a computer-readable recording medium. Those skilled in the art can implement the computer program according to the description of the above method. When the computer program is executed in a computer, the above microgrid protection method of the present invention is implemented.

[0141] In addition, it should be understood that the various units in the device according to the exemplary embodiment of the present invention can be implemented as hardware components and / or software components. Those skilled in the art can, for example, use a field programmable gate array (FPGA) or an application specific integrated circuit (ASIC) to implement the various units according to the processing performed by the defined various units.

[0142] According to an exemplary embodiment of the present invention, since environmental parameters are taken into account to calculate the mud surface pile diameter and the calculated mud surface pile diameter is used to predict the weight of the main structure of the single pile foundation, an accurate prediction result on the weight of the main structure of the single pile foundation can be obtained, and the calculation process can be simplified and the calculation time can be saved.

[0143] According to an exemplary embodiment of the present invention, when the wave-current-mud surface bending moment is predicted based on the wave height having a high correlation with the wave-current-mud surface bending moment, an accurate prediction result can be obtained and the calculation process can be simplified.

[0144] According to an exemplary embodiment of the present invention, since the correlation between wave height and wave-current mud surface bending moment is high and the wave height is known, the fitting relationship between the wave height and the wave-current mud surface bending moment is also determined, so the wave-current mud surface bending moment can be calculated more accurately using less calculation time.

[0145] According to an exemplary embodiment of the present invention, when the mud surface load is calculated based on the mud surface pile diameter that has a correlation with the mud surface load, the time for calculating the mud surface load can be reduced and the mud surface load can be calculated more accurately.

[0146] According to an exemplary embodiment of the present invention, since there is a correlation between the fitting relationship between the mud surface load and the mud surface pile diameter and the mud surface load is predictable, the fitting relationship between the mud surface load and the mud surface pile diameter is also determined, so the mud surface pile diameter can be accurately calculated while saving calculation time.

[0147] According to an exemplary embodiment of the present invention, the length-to-diameter ratio values ​​of the designed single pile foundations at different locations (e.g., field areas) and different unit capacities can be counted, and the average length-to-diameter ratio that varies with the pile diameter can be obtained by data fitting to represent the location and the unit capacity. Through the above method of the present invention, the pile length under the mud can be calculated based on the pile diameter on the mud surface, thereby eliminating the need to process a large amount of data such as rock and soil stratification and rock and soil parameters, reducing the calculation complexity and saving calculation time.

[0148] According to an exemplary embodiment of the present invention, the diameter-thickness ratio of the designed single pile foundation at different locations (e.g., field areas) and different unit capacities can be counted, and the average length-diameter ratio that varies with the pile diameter can be obtained by data fitting to represent the location and the unit capacity. Through the above method of the present invention, the wall thickness under the mud can be calculated based on the pile diameter on the mud surface, thereby eliminating the need to process a large amount of data for calculating the wall thickness under the mud, reducing the calculation complexity and saving calculation time.

[0149] According to an exemplary embodiment of the present invention, the diameter-thickness ratio of the monopile foundation designed at different locations (e.g., field areas) and different unit capacities can be counted, and the diameter-thickness ratio that varies with the pile diameter of the above-water part can be obtained by data fitting to represent the location and the unit capacity. Through the above method of the present invention, the wall thickness in water can be calculated based on the diameter of the above-water part, thereby reducing the calculation complexity and saving the calculation time.

[0150] According to an exemplary embodiment of the present invention, the diameter-thickness ratio of the monopile foundation designed at different locations (e.g., field areas) and different unit capacities can be counted, and the diameter-thickness ratio that varies with the pile diameter of the underwater part can be obtained by data fitting to represent the location and the unit capacity. Through the above method of the present invention, the underwater wall thickness can be calculated based on the minimum diameter and maximum diameter of the underwater part, thereby reducing the calculation complexity and saving calculation time.

[0151] According to an exemplary embodiment of the present invention, in a case where the shape of the under-mud portion is simplified as a circular pipe, the weight of the under-mud portion may be quickly predicted.

[0152] According to an exemplary embodiment of the present invention, in a case where the shape of the above-water part is simplified as a circular tube, the weight of the above-water part may be quickly predicted.

[0153] According to an exemplary embodiment of the present invention, in the case where the shape of the underwater part is simplified as a conical tube, the weight of the underwater part can be quickly predicted.

[0154] According to an exemplary embodiment of the present invention, the weight of the main structure of the offshore wind turbine monopile foundation can be predicted quickly and relatively accurately with only a small number of parameters input.

[0155] Although the present disclosure includes specific examples, it will be clear to those of ordinary skill in the art that various changes in form and detail may be made in these examples without departing from the spirit and scope of the claims and their equivalents. The examples described herein should be considered to be descriptive only and not for limiting purposes. The description of features or aspects in each example should be considered to be applicable to similar features or aspects in other examples. If the described techniques are performed in a different order, and / or if the components in the described systems, architectures, devices, or circuits are combined in different ways, and / or replaced or supplemented by other components or their equivalents, suitable results can be achieved. Therefore, the scope of the disclosure is not limited by specific embodiments, but by the claims and their equivalents, and all changes within the scope of the claims and their equivalents should be interpreted as included in the disclosure.

Claims

1. A method for predicting the weight of a monopile foundation main structure of an offshore wind turbine, the method comprising: Acquiring environmental parameters of a location where the monopile foundation main structure will be installed; Based on the environmental parameters, calculating the pile diameter on the mud surface of the main structure of the single pile foundation; Based on the pile diameter on the mud surface, the weight of the main structure of the single pile foundation is predicted. The environmental parameters include one or more of the water depth, wave height, wave period and flow velocity at the location, Wherein, the environmental parameters include the wave height, Wherein, the step of calculating the mud surface pile diameter of the main structure of the single pile foundation comprises: Based on the wave height, calculating the wave flow mud surface bending moment of the main structure of the single pile foundation; Calculating the mud surface load of the main structure of the single pile foundation based on the wave-flow mud surface bending moment; Based on the mud surface load, the mud surface pile diameter is calculated. Wherein, the step of calculating the mud surface load of the main structure of the single pile foundation includes: Obtaining a foundation top bending moment load and a foundation top horizontal force load of the main structure of the single pile foundation; The mud surface load is calculated as the sum of the product of the foundation top bending moment load, the foundation top horizontal force load and the distance from the foundation top to the mud surface and the wave flow mud surface bending moment.

2. The method of claim 1, wherein: The step of calculating the wave-flow mud surface bending moment of the main structure of the single pile foundation comprises: Obtaining the capacity of the unit to be installed on the main structure of the monopile foundation; Based on the capacity of the unit and the location where the monopile foundation main structure is to be installed, determining a fitting relationship between the wave height and the wave-flow mud surface bending moment, wherein the fitting relationship between the wave height and the wave-flow mud surface bending moment is obtained based on a fitting between historical wave heights and historical wave-flow mud surface bending moments corresponding to the capacity of the unit and the location where the monopile foundation main structure is to be installed; The wave-flow-mud surface bending moment is calculated based on the wave height and the fitting relationship between the wave height and the wave-flow-mud surface bending moment.

3. The method of claim 1, wherein: The fitting relationship between the wave height and the wave-flow-mud surface bending moment is an exponential function relationship, and indicates that the correlation coefficient between the wave height and the wave-flow-mud surface bending moment is greater than or equal to 0.

9.

4. The method of claim 1, wherein: The step of calculating the mud surface pile diameter comprises: Obtaining the capacity of the unit to be installed on the main structure of the monopile foundation; Based on the capacity of the unit and the location where the monopile foundation main structure is to be installed, determining a fitting relationship between the mud surface load and the mud surface pile diameter, wherein the fitting relationship between the mud surface load and the mud surface pile diameter is obtained based on the fitting between historical mud surface loads and historical mud surface pile diameters corresponding to the capacity of the unit and the location where the monopile foundation main structure is to be installed, The mud surface pile diameter is calculated based on the mud surface load and the fitting relationship between the mud surface load and the mud surface pile diameter.

5. The method of claim 1, wherein: The step of predicting the weight of the main structure of the monopile foundation comprises: Based on the pile diameter on the mud surface, calculating the pile length under the mud and the wall thickness under the mud of the main structure of the single pile foundation; Calculating the weight of the sub-mud portion of the main structure of the single pile foundation based on the pile diameter on the mud surface, the pile length under the mud, and the thick wall under the mud; Based on the weight of the sub-mud portion, the weight of the monopile foundation main structure is calculated.

6. The method of claim 5, wherein: The step of calculating the sub-mud pile length of the main structure of the single pile foundation comprises: Obtaining the capacity of the unit to be installed on the main structure of the monopile foundation; The length-to-diameter ratio is determined based on the mud surface pile diameter, the capacity of the unit and the location where the monopile foundation main structure is to be installed, and a fitting relationship between the mud surface pile diameter and the length-to-diameter ratio of the submerged portion, wherein the fitting relationship between the mud surface pile diameter and the length-to-diameter ratio is obtained based on a fitting relationship between a historical mud surface pile diameter corresponding to the capacity of the unit and the location where the monopile foundation main structure is to be installed and a historical length-to-diameter ratio of the submerged portion; The product of the pile diameter on the mud surface and the length-to-diameter ratio is calculated as the pile length under the mud.

7. The method of claim 5, wherein: The step of calculating the thickness of the sub-mud wall of the main structure of the single pile foundation comprises: Obtaining the capacity of the unit to be installed on the main structure of the monopile foundation; Determine the diameter-thickness ratio based on the pile diameter on the mud surface, the capacity of the unit and the location where the main structure of the monopile foundation will be installed, and a fitting relationship between the pile diameter on the mud surface and the diameter-thickness ratio of the submerged portion, wherein the fitting relationship between the pile diameter on the mud surface and the diameter-thickness ratio is obtained based on a fitting between a historical pile diameter on the mud surface corresponding to the capacity of the unit and the location where the main structure of the monopile foundation will be installed and a historical submerged wall thickness of the submerged portion; The ratio between the pile diameter on the mud surface and the diameter-to-thickness ratio is calculated as the wall thickness under the mud.

8. The method of claim 5, wherein: The step of calculating the weight of the sub-mud part of the main structure of the monopile foundation comprises: Based on the pile diameter on the mud surface, the pile length under the mud and the thick wall under the mud, the volume of the under-mud part of the main structure of the single pile foundation is calculated, wherein the shape of the under-mud part is a circular tube; The weight of the subsoil portion is calculated based on the volume of the subsoil portion and the density of a material used to construct the subsoil portion.

9. The method of claim 5, wherein: The step of calculating the weight of the main structure of the monopile foundation also includes: Obtaining the water depth of the location where the monopile foundation main structure is to be installed and the foundation top diameter and foundation top height of the monopile foundation main structure; Calculating the weight of the above-water portion of the monopile foundation main structure based on the foundation top diameter and the foundation top height of the monopile foundation main structure; Calculate the weight of the underwater portion of the main structure of the single pile foundation based on the water depth, the foundation top diameter and the mud surface pile diameter; The sum of the weight of the above-water part, the weight of the underwater part and the weight of the submerged part is calculated as the weight of the main structure of the single pile foundation.

10. The method of claim 9, wherein: The step of calculating the weight of the above-water portion of the monopile foundation main structure comprises: Obtaining the capacity of the unit to be installed on the main structure of the monopile foundation; Determining the diameter-thickness ratio based on the capacity of the unit, the location where the monopile foundation main structure is to be installed, the foundation top diameter, and a fitting relationship between the foundation top diameter and the diameter-thickness ratio of the above-water portion, wherein the fitting relationship between the foundation top diameter and the diameter-thickness ratio is determined based on a fitting between a historical foundation top diameter of the above-water portion corresponding to the capacity of the unit and the location where the monopile foundation main structure is to be installed and a historical diameter-thickness ratio; Calculating the ratio between the foundation top diameter and the diameter-to-thickness ratio as the above-water wall thickness of the above-water portion; Calculating the volume of the above-water portion based on the foundation top diameter, the foundation top height and the above-water wall thickness, wherein the above-water portion is in the shape of a circular tube; The weight of the above-water portion is calculated based on the volume of the above-water portion and the density of the material used to construct the above-water portion.

11. The method of claim 9, wherein: The above-mentioned step of calculating the weight of the underwater part of the main structure of the monopile foundation includes: Obtaining the capacity of the unit to be installed on the main structure of the monopile foundation; The diameter-thickness ratio is determined based on the capacity of the unit, the location where the monopile foundation main structure is to be installed, the foundation top diameter, the mud surface pile diameter, and the diameter of the underwater portion and the diameter-thickness ratio of the underwater portion, wherein the diameter-thickness ratio is obtained based on the fitting between the historical diameter of the underwater portion corresponding to the capacity of the unit and the location where the monopile foundation main structure is to be installed and the historical diameter-thickness ratio, The underwater wall thickness of the underwater portion is calculated based on the ratio between the diameter and the diameter-to-thickness ratio, wherein the minimum diameter of the underwater portion is equal to the foundation top diameter, the maximum diameter of the underwater portion is equal to the mud surface pile diameter, and the shape of the underwater portion is a tapered tube; Calculate the volume of the underwater portion based on the water depth, the foundation top diameter, the mud surface pile diameter and the underwater wall thickness; The weight of the underwater portion is calculated based on the volume of the underwater portion and the density of the material used to construct the underwater portion.

12. A computer-readable storage medium storing a computer program, wherein when the computer program is executed by a processor, the method according to any one of claims 1 to 11 is implemented.

13. A device for predicting the weight of a main structure of a monopile foundation of an offshore wind turbine, the device comprising: processor; Memory, The memory stores a computer program, and when the computer program is executed by the processor, the method according to any one of claims 1 to 11 is implemented.

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