Section load analysis method for offshore floating structure and application

Abstract

The invention belongs to the technical field of ocean engineering, and particularly discloses a section load analysis method and application of an offshore floating structure, and the method comprises the steps: S1, determining the section position of the structural load of the floating structure, and dividing the floating structure into a plurality of blocks according to the section position; s2, solving a hydrodynamic coefficient of each block based on a potential flow theory and a frequency domain boundary element method; s3, establishing a multi-block floating structure model in a time domain, and determining performance parameters of each individual unit in the model; and S4, constructing a virtual beam unit between each individual unit and the cross section, and calculating the load difference of nodes at two ends of the virtual beam unit to obtain the load of each cross section of the floating structure. According to the method, the problem of solving the section load of the floating structure is converted into the problem of solving the difference value of the external load of the multi-block floating body; the integrated solution of the motion and section load of the floating structure is realized.

Description

Technical Field

[0001] The present invention relates to the technical field of ocean engineering, and particularly relates to a method for analyzing the sectional load of an offshore floating structure and its application. Background Art

[0002] Currently, in the fields of ocean engineering and offshore new energy, the indirect time-domain method is widely used to analyze the wave loads, motion responses, and mooring tensions suffered by floating structures under different ocean environmental conditions. However, in the process of calculating using the indirect time-domain method, the floating structure is regarded as a mass point without volume, so the sectional load at a specific position of the floating structure cannot be solved. This makes most of the current methods for solving the sectional load of floating structures indirect decoupling methods, which cannot solve the motion response and structural load of the floating structure simultaneously, reducing the accuracy of the structural load calculation and solution, increasing the calculation cost, and reducing the efficiency of engineering design.

[0003] In summary, there is a need to design a method for analyzing the sectional load of an offshore floating structure and its application to solve the above problems in the prior art. Summary of the Invention

[0004] The present invention provides a method for analyzing the sectional load of an offshore floating structure and its application, which solves the technical problem that the indirect time-domain method cannot solve the motion response and sectional load of the floating structure simultaneously.

[0005] To achieve the purpose of solving the above technical problems, the present invention adopts the following technical solutions: A method for analyzing the sectional load of an offshore floating structure, comprising the following steps: Step S1: Determine the sectional position where the structural load of the floating structure is located, and divide the floating structure into multiple blocks according to the sectional position; Step S2: Solve the hydrodynamic coefficients of each block based on the potential flow theory and the frequency-domain boundary element method; Step S3: Establish a multi-block floating structure model in the time domain. The floating structure model includes multiple body units, and the number of body units is the same as the number of blocks; and determine the performance parameters of each body unit; Step S4: Construct virtual beam units between each section and its adjacent body units, and the corresponding sectional load can be obtained by calculating the load difference between the two end nodes of the virtual beam unit.

[0006] In some embodiments of the present invention, step S3 includes the following steps: S31: Establish a body unit based on the indirect time-domain method; S32. Determine the performance parameters of each individual unit, where the performance parameters include buoyancy, hydrostatic restoring force stiffness, and mass; S33. Calculate the hydrodynamic parameters of each individual unit in the time domain.

[0007] In some embodiments of the present invention, the construction process of the virtual beam element in step S4 includes: S41. Construct a first virtual beam element between a certain section p and its adjacent body unit B1, and construct a second virtual beam element between the certain section p and its adjacent body unit B2; wherein, the two ends of the first virtual beam element are provided with a first node and a second node; the two ends of the second virtual beam element are provided with a third node and a fourth node; S42. Construct a third virtual beam element between the second node and the third node, and the second node and the third node are symmetric about the section p and both the second node and the third node are nodes infinitely close to the section P.

[0008] In some embodiments of the present invention, the first node is equivalent to the body unit B1; the first virtual beam element is used to transfer the external force received by the body unit B1 to the second node; the fourth node is equivalent to the body unit B2; the second virtual beam element is used to transfer the external force received by the body unit B2 to the third node.

[0009] In some embodiments of the present invention, the calculation process of the section load is as follows: S43. Calculate the load of the second node using the performance parameters and hydrodynamic parameters of the body unit B1; calculate the load of the third node using the performance parameters and hydrodynamic parameters of the body unit B2; S44. Calculate the load difference between the second node and the third node, and the load difference is the section load of the section p; S45. Solve the section loads of each section according to steps S41 - S44.

[0010] In some embodiments of the present invention, the masses of the first virtual beam element, the second virtual beam element, and the third virtual element are all close to 0, and the axial stiffness, bending stiffness, and torsional stiffness of the section are all taken as relatively large values, such as 1E15N, 1E15, 1E15.

[0011] In some embodiments of the present invention, step S32 includes: S321. Calculate the buoyancy suffered according to the drainage volume of each body unit, and add it to the body unit in the form of an additional external force; S322. Calculate the hydrostatic restoring force stiffness of each body unit according to the following formula, and input it into the hydrostatic restoring force stiffness matrix of each body unit: ; wherein, g is the acceleration due to gravity, ρ refers to the fluid density, m is the weight of the volume element, n3 is the vertical component of the normal vector of the object surface, and S b represents the wet surface of the object; x, y, and z respectively represent the coordinates of the volume element on the x-axis, y-axis, and z-axis; x b , y b , z b respectively represent the coordinates of the center of buoyancy on the x-axis, y-axis, and z-axis; x g , y g , z g respectively represent the coordinates of the center of gravity of the volume element on the x-axis, y-axis, and z-axis; S323. Given the mass and mass distribution of each volume element, determine the mass, center of gravity, and moment of inertia of each volume element.

[0012] In some embodiments of the present invention, there is provided an application of the cross-sectional load analysis method for a floating offshore structure, including: Establish a time-domain model of the floating structure according to the above cross-sectional load analysis method; Establish a numerical model of the mooring system according to the positions of the fairleads and anchor points and the cross-sectional properties of the mooring cables; Input wave condition parameters into the above model; Conduct time-domain simulation and output the time history of the motion response of the floating structure and the structural load at the cross-sectional position of the floating structure.

[0013] In some embodiments of the present invention, there is provided an electronic device, including: A processor, and a memory and a transceiver communicatively connected to the processor; The memory stores computer-executable instructions; the transceiver is used for sending and receiving data; The processor executes the computer-executable instructions stored in the memory to implement the above cross-sectional load analysis method.

[0014] In some embodiments of the present invention, there is provided a computer-readable storage medium, characterized in that The computer-readable storage medium stores computer-executable instructions, and when the computer-executable instructions are executed by a processor, they are used to implement the above cross-sectional load analysis method.

[0015] The technical solution of the present invention has the following technical effects compared with the prior art: The present invention proposes a modeling method for a multi-block floating structure, which converts the problem of solving the sectional load of the floating structure into the problem of solving the difference in external loads of the multi-block floating body, and solves the problem that the sectional load of the floating structure cannot be calculated during the time-domain coupling analysis of the floating structure; realizes the integrated solution of the motion and sectional load of the floating structure. Description of the Drawings

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0017] Figure 1 It is a schematic diagram of the sectional division of the floating structure.

[0018] Figure 2 It is a schematic diagram of the axial forces of Section 1 and Section 2.

[0019] Figure 3 It is a schematic diagram of the horizontal shear forces of Section 1 and Section 2.

[0020] Figure 4 It is a schematic diagram of the vertical shear forces of Section 1 and Section 2.

[0021] Figure 5 It is a schematic diagram of the horizontal bending moments of Section 1 and Section 2.

[0022] Figure 6 It is a schematic diagram of the vertical bending moments of Section 1 and Section 2.

[0023] Figure 7 It is a schematic diagram of the torques of Section 1 and Section 2.

[0024] Figure 8 It is a schematic diagram of the structure of the electronic device.

[0025] Reference Numerals: 100, floating structure; 110, side column; 120, central column; 200, electronic device; 210, processor; 220, memory; 230, transceiver. Detailed Embodiments

[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of the present invention.

[0027] In the description of the present invention, it should be noted that, unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations. In the description of the above embodiments, specific features, structures, materials, or characteristics can be combined in a suitable manner in any one or more embodiments or examples.

[0028] Embodiment 1: This embodiment provides a method for analyzing the sectional load of an offshore floating structure, including the following steps: Step S1: Determine the sectional positions where the structural loads of the floating structure are located, and divide the floating structure into multiple blocks according to the sectional positions; Referring to Figure 1 as shown, the sectional positions of the structural loads of the floating structure are located at the middle sections of three horizontal pontoons, three side columns, and one central column, totaling 7 sectional positions; The entire floating structure is divided into blocks according to the sectional positions. Since the entire floating structure consists of 7 parts: one central column, three side columns, and three horizontal pontoons, and each part is divided into two parts by the concerned section, the entire floating structure is divided into 14 blocks.

[0029] Step S2: Solve the hydrodynamic coefficients of each block based on the potential flow theory and the frequency-domain boundary element method; The hydrodynamic coefficients include the wave exciting force transfer function and the wave radiation force transfer function.

[0030] S21: Calculate the wave exciting force transfer function. The wave exciting force includes the incident wave force generated by the incident velocity potential and the diffraction wave force generated by the diffraction velocity potential: The expression of the incident velocity potential φ0 is: ; where d is the water depth and k is the wave number. As long as the incident wave frequency ω0 and the water depth d are determined, the corresponding unique wave number k can be determined through the dispersion relation equation: k ·tanh kd = ω0 2 / g.

[0031] The diffraction velocity potential φ D can be obtained by solving the following control equations and boundary conditions:

[0032] After obtaining the incident potential φ0 and the diffraction velocity potential φD After that, the dynamic pressure on the surface of the floating structure can be obtained through the Bernoulli equation: p = -iω0ρφ; where ρ refers to the fluid density.

[0033] The wave exciting force transfer function acting on the surface of the object can be obtained by integrating the incident and diffracted pressures on the wet surface of the object: .

[0034] S22. Solve the wave radiation force transfer function, and the radiation potential φ j can be obtained by solving the following control equations and boundary conditions:

[0035] After obtaining the radiation potential φ j After that, the dynamic pressure on the surface of the floating structure can be obtained through the Bernoulli equation: p = -iω0ρφ; where ρ is the fluid density.

[0036] The wave radiation force transfer function acting on the surface of the object can be obtained by integrating the radiation pressure on the wet surface of the object:

[0037] where A jk is the added mass, and B jk is the radiation damping.

[0038] Step S3. Establish a multi-block floating structure model in the time domain. The floating structure model includes a plurality of body elements, and the number of body elements is the same as the number of blocks; and determine the performance parameters of each body element; S31. Establish body elements based on the indirect time domain method; Based on the block division of the floating structure, establish a multi-block floating structure model in the time domain. This step can be carried out in any software based on the indirect time domain method, such as SIMA, Orcaflex, OpenFast, etc. The specific steps are as follows (taking SIMA as an example): Establish body elements with the same number as the number of blocks based on the SIMO module; since the phase of the wave load suffered by the body element is related to its reference coordinate, in order to ensure that the phase of the wave force suffered by each body element of the multi-block floating structure model at the same moment is consistent with the phase of the wave force suffered by the rigid floating structure model, set the reference coordinates of each body element to (0, 0, 0).

[0039] S32. Determine the performance parameters of each body element. The performance parameters include buoyancy, hydrostatic restoring force stiffness, and mass; S321. Calculate the buoyancy suffered according to the drainage volume of each body element, and add it to the body element in the form of an additional external force.

[0040] S322. Calculate the hydrostatic restoring force stiffness of each body element according to the following formula, and input it into the hydrostatic restoring force stiffness matrix of each body element:

[0041] where g is the acceleration due to gravity, ρ refers to the fluid density, m is the weight of the body element, n3 is the vertical component of the normal vector of the object surface, and S b represents the wet surface of the object; x, y, and z respectively represent the coordinates of the body element on the x-axis, y-axis, and z-axis; x b , y b , z b respectively represent the coordinates of the center of buoyancy on the x-axis, y-axis, and z-axis; x g , y g , z g respectively represent the coordinates of the center of gravity of the body element on the x-axis, y-axis, and z-axis.

[0042] S323. Given the mass, center of gravity, and moment of inertia of each body element according to the mass and mass distribution of each body element.

[0043] S33. Calculate the hydrodynamic coefficients of each body element in the time domain.

[0044] S331. Based on the frequency-time domain conversion technology of the indirect time domain method, calculate the wave excitation force suffered by the floating structure body element i in the time domain:

[0045]

[0046] where f wj (1) (ω) is the wave excitation force transfer function calculated in the frequency domain; η(t) represents the wave time history.

[0047] S332. Based on the frequency-time domain conversion technology of the indirect time domain method, calculate the wave radiation force suffered by the floating structure (block i) in the time domain:

[0048] where A(∞) is the added mass matrix when the wave frequency is infinite:

[0049] where K(t) is the delay function and B(ω) is the added damping coefficient matrix of the floating structure.

[0050] Step S4: Construct virtual beam elements between each cross-section and its adjacent volume elements, and the corresponding cross-section load can be obtained by calculating the load difference between the two end nodes of the virtual beam element.

[0051] S41: Construct a first virtual beam element between a certain cross-section p and its adjacent volume element B1, and construct a second virtual beam element between the certain cross-section p and its adjacent volume element B2; wherein, the two ends of the first virtual beam element are provided with a first node and a second node; the two ends of the second virtual beam element are provided with a third node and a fourth node; Among them, the first node N1 is the node located at the reference coordinate (0, 0, 0), which is used to associate with the volume element B1, and the second node N2 is located on the central axis of the cross-section P, and its coordinates in the global coordinate system are (x PN2 , y PN2 , z PN2 ); The function of the first virtual beam element is to connect the first node N1 and the second node N2.

[0052] The fourth node N4, whose coordinates in the global coordinate system are (x PN4 , y PN4 , z PN4 ) is used to associate with the volume element B2, and the third node N3 is located on the central axis of the cross-section P, and its coordinates in the global coordinate system are (x PN3 , y PN3 , z PN3 ); The function of the second virtual beam element is to connect the fourth node N4 and the third node N3.

[0053] In some embodiments, both the volume element B1 and the volume element B2 can be regarded as 1 mass point, and the first node N1 and the fourth node N4 are respectively used to replace the corresponding mass points. The mass of the cross-section of the first virtual beam element and the second virtual beam element is close to 0, and the axial stiffness, bending stiffness, and torsional stiffness of the cross-section are all taken as relatively large values, such as 1E15N, 1E15, 1E15, which can effectively avoid the influence of the mass and structural deformation of this virtual beam element on the solution of the cross-section load.

[0054] The resultant external force received by the volume element B1 can be transmitted to the second node N2 through the first virtual beam element; similarly, the resultant external force received by the volume element B2 can be transmitted to the third node N3 through the second virtual beam element.

[0055] S42: Construct a third virtual beam element between the second node and the third node, and the second node and the third node are symmetric about the cross-section p and both the second node and the third node are nodes infinitely close to the cross-section P.

[0056] The function of the third virtual beam element is to connect the second node N2 and the third node N3. Similarly, the mass of the cross-section of the third virtual beam element is close to 0, and the axial stiffness, bending stiffness, and torsional stiffness of the cross-section are all taken as relatively large values, such as 1E15N, 1E15, 1E15, which can effectively avoid the influence of the mass of this virtual beam element and the structural deformation on the solution of the cross-section load.

[0057] S43. Calculate the load of the second node by using the performance parameters and hydrodynamic parameters of the solid element B1; calculate the load of the third node by using the performance parameters and hydrodynamic parameters of the solid element B2; S44. Calculate the load difference between the second node and the third node, and this load difference is the cross-section load of the cross-section p; S45. Solve the cross-section loads of each cross-section according to steps S41 - S44.

[0058] Continue to refer to Figure 1 As shown, both cross-section 1 and cross-section 2 are cross-sections of the side columns of the floating structure along the Z-axis direction.

[0059] Refer to Figures 2 - 7 As shown, it is a comparison diagram of multiple loads of cross-section 1 and cross-section 2 obtained by the calculation method of this embodiment. It can be seen from the figure that both cross-section 1 and cross-section 2 have loads in terms of axial force, vertical shear force, and vertical bending moment, but the load intensities of the two are different. Specifically, the load of cross-section 1 is greater. In terms of horizontal shear force, horizontal bending moment, and torque, the load of cross-section 2 is greater, and the load of cross-section 1 is almost zero.

[0060] This method is based on the indirect time domain method widely used in the field of ocean engineering, and innovatively proposes a modeling method for multi-block floating structures, converting the problem of solving the cross-section load of the floating structure into the problem of solving the difference of external loads of multi-block floating bodies, and solving the problem that the cross-section load of the floating structure cannot be calculated during the time domain coupling analysis of the floating structure. Compared with the finite element method, since it does not need to mesh the entire floating structure at each calculation time step, it has an advantage in calculation efficiency.

[0061] Embodiment 2: Provide an application of the cross-section load analysis method for offshore floating structures, including: Step 1. Establish a time domain model of the floating structure according to the above cross-section load analysis method; Step 2. Establish a numerical model of the mooring system according to the positions of the fairleads and anchor points, and the cross-section properties of the mooring cables; Step 3. Input wave condition parameters into the model in Step 2; specifically, it includes parameters such as wave spectrum type, significant wave height, spectral peak period, and spectral peak elevation factor; Step 4: Conduct time-domain simulation and output the time history of the motion response of the floating structure and the structural loads at the cross-section positions of the floating structure, including axial force, shear force, bending moment, torque, etc.

[0062] In the existing process of solving the cross-section loads of a floating structure, since it is necessary to input the external environmental loads of the floating structure in a moving state by means of other methods, this makes the finite element method separate the solution of its motion from the cross-section loads. However, this method can solve the motion and cross-section loads of the floating structure integrally, solving the technical problem that the indirect time-domain method cannot simultaneously solve the motion response and cross-section loads of the floating structure, improving the accuracy of the calculation and solution of the structural loads, reducing the calculation cost, and improving the efficiency of engineering design.

[0063] Example 3: Refer to Figure 8 As shown, an electronic device 200 is provided, including: A processor 210, and a memory 220 and a transceiver 230 communicatively connected to the processor; The memory 220 stores computer-executable instructions; the transceiver 230 is used for sending and receiving data; The processor 210 executes the computer-executable instructions stored in the memory 220 to implement the cross-section load analysis method in Example 1.

[0064] It should be understood that the electronic device 200 can be used to execute the corresponding steps and / or processes in the above method embodiments. Optionally, the memory 220 may include a read-only memory and a random access memory, and provide instructions and data to the processor. A part of the memory 220 may also include a non-volatile random access memory. For example, the memory 220 may also store information about the device type. The processor 210 may be used to execute the instructions stored in the memory 220, and when the processor 210 executes the instructions, the processor 210 may execute the corresponding steps and / or processes in the above method embodiments.

[0065] It should be understood that in the embodiments of the present application, the processor 210 may be a central processing unit (CPU), and the processor 210 may also be other general-purpose processors, DSP digital signal processors, ASIC application-specific integrated circuits, field programmable gate arrays (FPGAs) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or the processor may also be any conventional processor, etc.

[0066] In the implementation process, each step of the above method can be completed by the integrated logic circuit of the hardware in the processor 210 or the instructions in the form of software. The steps of the method disclosed in combination with the embodiments of the present application can be directly embodied as being executed and completed by the hardware processor, or executed and completed by the combination of the hardware and software modules in the processor 210. The software module can be located in a mature storage medium in the art such as random access memory, flash memory, read-only memory, programmable read-only memory, or electrically erasable programmable memory, register, etc. This storage medium is located in the memory, and the processor executes the instructions in the memory and combines its hardware to complete the steps of the above method. To avoid repetition, it will not be described in detail here.

[0067] Embodiment 4: In this embodiment, a computer-readable storage medium is provided. Computer-executable instructions are stored in the computer-readable storage medium, and when the computer-executable instructions are executed by a processor, they are used to implement the cross-section load analysis method in Embodiment 1.

[0068] In several embodiments provided in the present application, it should be understood that the disclosed systems, devices, and methods can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the units is only a logical function division, and there may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed couplings or direct couplings or communication connections to each other can be through some interfaces. The indirect couplings or communication connections of the devices or units can be in electrical, mechanical, or other forms.

[0069] The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they can be located in one place, or distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0070] In addition, the functional units in each embodiment of the present application can be integrated in one processing unit, or each unit exists physically alone, or two or more units can be integrated in one unit.

[0071] When the above-mentioned function is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art or a part of this technical solution can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in various embodiments of this application. The foregoing storage medium includes: various media that can store program codes, such as USB flash drives, mobile hard disks, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical discs.

[0072] In the description of the above embodiments, specific features, structures, materials, or characteristics may be combined in a suitable manner in any one or more embodiments or examples.

[0073] The above are only the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. A method for analyzing the sectional load of an offshore floating structure, characterized in that It includes the following steps: Step S1: Determine the cross-section position where the structural load of the floating structure is located, and divide the floating structure into multiple blocks according to the cross-section position; Step S2: Solve the hydrodynamic coefficients of each block based on the potential flow theory and the frequency-domain boundary element method; Step S3: Establish a multi-block floating structure model in the time domain. The floating structure model includes multiple body elements, and the number of them is the same as the number of blocks; and determine the performance parameters of each body element; Step S4: Construct virtual beam elements between each cross-section and its adjacent body elements, and the corresponding cross-section load can be obtained by calculating the load difference between the two end nodes of the virtual beam element.

2. The cross-section load analysis method of the offshore floating structure according to claim 1, characterized in that The said Step S3 includes the following steps: S31: Establish body elements based on the indirect time-domain method; S32: Determine the performance parameters of each body element. The performance parameters include buoyancy, hydrostatic restoring force stiffness, and mass; S33: Calculate the hydrodynamic parameters of each body element in the time domain.

3. The cross-section load analysis method of the offshore floating structure according to claim 2, wherein, The construction process of the virtual beam element in the said Step S4 includes: S41: Construct a first virtual beam element between a certain cross-section p and its adjacent body element B1, and construct a second virtual beam element between a certain cross-section p and its adjacent body element B2; wherein, the two ends of the first virtual beam element are provided with a first node and a second node; the two ends of the second virtual beam element are provided with a third node and a fourth node; S42: Construct a third virtual beam element between the second node and the third node. The second node and the third node are symmetric about the cross-section p, and both the second node and the third node are nodes infinitely close to the cross-section P.

4. The cross-sectional load analysis method for the offshore floating structure according to claim 3, characterized in that, The first node is equivalent to the body element B1; the first virtual beam element is used to transfer the external force received by the body element B1 to the second node; the fourth node is equivalent to the body element B2; the second virtual beam element is used to transfer the external force received by the body element B2 to the third node.

5. The cross-sectional load analysis method of the offshore floating structure according to claim 3, characterized in that, The calculation process of the cross-section load is: S43: Calculate the load of the second node by using the performance parameters and hydrodynamic parameters of the body element B1; calculate the load of the third node by using the performance parameters and hydrodynamic parameters of the body element B2; S44: Calculate the load difference between the second node and the third node, and the load difference is the cross-section load of the cross-section p; S45: Solve the cross-section loads of each cross-section according to Steps S41 - S44.

6. The cross-sectional load analysis method of the offshore floating structure according to claim 3, characterized in that The masses of the first virtual beam element, the second virtual beam element, and the third virtual element are all close to 0.

7. The method for analyzing the sectional load of the offshore floating structure according to claim 2, characterized in that, The said Step S32 includes the following steps: S321: Calculate the buoyancy suffered according to the drainage volume of each body element, and add it to the body element in the form of an additional external force; S322: Calculate the hydrostatic restoring force stiffness of each body element according to the following formula, and input it into the hydrostatic restoring force stiffness matrix of each body element: ； Among them, g is the acceleration due to gravity, ρ refers to the fluid density, m is the weight of the volume element, n3 is the vertical component of the normal vector of the object surface, and S b represents the wet surface of the object; x, y, and z respectively represent the coordinates of the volume element on the x-axis, y-axis, and z-axis; x b , y b , z b respectively represent the coordinates of the center of buoyancy on the x-axis, y-axis, and z-axis; x g , y g , z g respectively represent the coordinates of the center of gravity of the volume element on the x-axis, y-axis, and z-axis; S323: Specify the mass, center of gravity, and moment of inertia of each body element according to the mass and mass distribution of each body element.

8. Application of a method for analyzing cross-sectional loads of a floating offshore structure, characterized in that, It includes: Establish the time-domain model of the floating structure according to the cross-section load analysis method described in any one of Claims 1 - 7; Establish a numerical model of the mooring system according to the fairlead, the position of the anchoring point, and the cross-sectional properties of the mooring cable; Input the wave condition parameters into the above model; Conduct time-domain simulation and output the time history of the motion response of the floating structure and the structural loads at the cross-sectional positions of the floating structure.

9. An electronic device, characterized in that, Including: A processor, as well as a memory and a transceiver communicatively connected to the processor; The memory stores computer-executable instructions; the transceiver is used for sending and receiving data; The processor executes the computer-executable instructions stored in the memory to implement the cross-sectional load analysis method according to any one of claims 1-7.

10. A computer-readable storage medium, characterized in that The computer-readable storage medium stores computer-executable instructions, and when the computer-executable instructions are executed by a processor, they are used to implement the cross-sectional load analysis method according to any one of claims 1-7.

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