Physical model preparation method and system for offshore floating structure mooring system

Abstract

The present invention belongs to the field of marine engineering technology, and specifically discloses a method and system for preparing a physical model of an offshore floating structure mooring system, wherein the method comprises S1, establishing an anchor chain physical model; S2, establishing an offshore floating structure coupling numerical model C0, and calculating an initial mooring cable tension time history T0 of an initial mooring system; S3, establishing an offshore floating structure coupling numerical model Ct, and calculating a hybrid mooring cable tension time history T0 of the hybrid mooring system t ; S4, calculate the initial mooring cable tension time history T0 and the hybrid mooring cable tension time history T t The comprehensive average error rate τ t ; S5, according to the comprehensive average error rate τ t The physical model of the mooring system is selected based on the relationship between the size of the allowable error rate τ0. The present invention can determine the key parameters of the lead wire bundling spacing and the corresponding added mass in the anchor chain preparation process, and comprehensively considers the comprehensive mechanical properties of different anchor chain physical model design schemes under static and dynamic conditions; it reduces the difficulty of anchor chain preparation and the excessive consumption of manpower.

Description

Technical Field

[0001] The present invention relates to the field of marine engineering technology, and in particular to a method and system for preparing a physical model of an offshore floating structure mooring system. Background Art

[0002] Offshore floating structures are generally composed of mooring systems, buoys, and superstructures. The mooring system provides horizontal restoring force for offshore floating structures and plays a key role in limiting large horizontal displacements of offshore floating structures. Conducting physical model tests is a key step in verifying the reliability of offshore floating structures. Before conducting physical model tests of offshore floating structures, it is necessary to prepare a physical model of the offshore floating structure.

[0003] The preparation of physical models of floating structures at sea needs to be scaled according to the prototype size, and the Froude number is generally used for scaling based on the similarity of inertial force. Anchor chain is the most commonly used mooring system for floating structures at sea. In the process of preparing the physical model of anchor chain, the method of winding lead wire on a small diameter anchor chain is often used to add mass to achieve similarity of mass per unit length. However, there is currently no method to determine the spacing of the lead wire winding positions and the corresponding winding mass. If the spacing of the winding positions is too large, the restoring force provided by the mooring system will be inaccurate during the physical model test. If the spacing of the winding positions is too small, it will increase the difficulty of preparing the anchor chain and excessive consumption of manpower.

[0004] In summary, it is now necessary to design a physical model preparation method and system for an offshore floating structure mooring system to solve the above problems in the prior art. Summary of the invention

[0005] The invention provides a method and system for preparing a physical model of an offshore floating structure mooring system, which solves the problem that the spacing of winding positions and the corresponding winding quality are difficult to determine before preparing a physical model test model of an anchor chain.

[0006] In order to achieve the purpose of solving the above technical problems, the present invention adopts the following technical solutions:

[0007] A method for preparing a physical model of an offshore floating structure mooring system comprises the following steps:

[0008] Step S1, using the initial chain to establish a physical model of the anchor chain;

[0009] Step S2, establishing an offshore floating structure coupling numerical model C0, whose mooring system is recorded as an initial mooring system, and the initial mooring system adopts an anchor chain prototype; simulating the test conditions, and calculating the initial mooring cable tension time history T0 of the initial mooring system;

[0010] Step S3, establish an offshore floating structure coupling numerical model Ct, whose mooring system is recorded as a hybrid mooring system, and the hybrid mooring system adopts two sections of spaced anchor chains, wherein the unit length mass of one section of the anchor chain is consistent with the unit length mass of the initial chain, and the unit length mass of the other section of the anchor chain is ; Wherein, m0 is the mass per unit length of the initial chain; M E Additional mass added to the anchor chain physical model; N t is the number of additional quality groups, t=1,2,3,…,T; l P The length of a single link of the anchor chain physical model; Calculate the hybrid mooring line tension time history T of the hybrid mooring system t ;

[0011] Step S4, calculating the initial mooring line tension time history T0 and the hybrid mooring line tension time history T t The comprehensive average error rate τ t ;

[0012] Step S5: Compare the comprehensive average error rate τ t and the size of the allowable error rate τ0, when the comprehensive average error rate τ t When it is less than the allowable error rate τ0, the current hybrid mooring system is used as the physical model of the mooring system for preparation.

[0013] When the comprehensive average error rate τ t If it is not less than the allowable error rate τ0, repeat steps S3-S4 until the comprehensive average error rate τ t When it is less than the allowable error rate τ0, the current hybrid mooring system is prepared as the physical model of the mooring system.

[0014] In some embodiments of the present invention, the calculation process of the initial mooring line tension time history T0 in step S2 is:

[0015] The anchor chain physical model is located between the bottom end point (x b , z b ) and the vertex point (x t , z t ) anchor chain is divided into overhanging anchor chain and bottom lying anchor chain;

[0016] Through the iterative solution method, according to the horizontal component T of the line tension of the hanging section anchor chain h , the vertical displacement change Δz of the top of the suspended anchor chain determines the catenary chain shape, and the position information of the fairlead hole at this time is obtained (x t , z t ) and mooring cable tension;

[0017] Conduct coupled analysis of mooring and buoyancy; extract initial mooring cable tension time history T0.

[0018] In some embodiments of the present invention, the overhanging segment anchor chain satisfies the following formula:

[0019] ;

[0020] Among them, t b represents the tangent line at the bottom of the catenary, t t represents the tangent line at the top of the catenary, w represents the effective weight of the catenary per unit length, T h represents the horizontal component of the catenary tension, EA represents the axial stiffness of the catenary; L F Represents the total length of the anchor chain prototype.

[0021] In some embodiments of the present invention, the bottom-lying anchor chain satisfies the following formula:

[0022] ;

[0023] Where θ represents the seafloor inclination angle, s Δ Represents the length of the bottom lying section, T t represents the apical tension, T b represents the bottom tension, μ represents the axial friction coefficient of the seabed;

[0024] T t With T b The following formula is also satisfied:

[0025] T t =T b +w(sinθ+μcosθ) L F ;

[0026] L F Represents the total length of the anchor chain prototype.

[0027] In some embodiments of the present invention, the hybrid mooring line tension time history T in step S4 is t The calculation process is:

[0028] Based on the initial mooring cable tension time history T0, the concentrated mass w is added c The calculation process:

[0029] ;

[0030] Among them, w c Represents the weight of the concentrated mass, t + ,t - Represent the tangent lines at the top and bottom of the concentrated mass, t s represents the seafloor slope, T + , T -Respectively represent the tension at the top and bottom of the concentrated mass;

[0031] Conduct coupling analysis of mooring and floating body; extract the hybrid mooring cable tension time history T of hybrid mooring system t .

[0032] In some embodiments of the present invention, the comprehensive average error rate τ in step S5 t The calculation formula is:

[0033] ;

[0034] The initial mooring cable tension time history T0 is a matrix of size m×n, where m represents the number of working conditions and n represents the amount of data under the simulation of this working condition; the hybrid mooring cable tension time history T t It is a matrix of size m×n, where m represents the number of working conditions, n represents the amount of data under the simulation of this working condition, and φ is the error weight parameter of each working condition.

[0035] In some embodiments of the present invention, in step S5, when the comprehensive average error rate τ t When it is less than the allowable error rate τ0, the spacing of the additional mass of the current hybrid mooring system is , the added mass .

[0036] In some embodiments of the present invention, a physical model preparation system for an offshore floating structure mooring system is provided, comprising:

[0037] A coupled numerical model building module, which is used to establish multiple coupled numerical models of offshore floating structures according to the type of mooring system;

[0038] A mooring cable tension time history calculation module, which is used to calculate the mooring cable tension time history of each offshore floating structure coupled numerical model;

[0039] A comparison iteration module, which is used to select a physical model of the mooring system according to a comprehensive average error rate;

[0040] The communication module is used to communicate with external devices.

[0041] In some embodiments of the present invention, there is provided an electronic device, comprising:

[0042] A processor, and a memory and a transceiver communicatively connected to the processor;

[0043] The memory stores computer-executable instructions; the transceiver is used to send and receive data;

[0044] The processor executes the computer-executable instructions stored in the memory to implement the above-mentioned physical model preparation method.

[0045] In some embodiments of the present invention, a computer-readable storage medium is provided, characterized in that:

[0046] 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-mentioned physical model preparation method.

[0047] The technical solution of the present invention has the following technical effects compared with the prior art:

[0048] The present invention can determine the key parameters of the anchor chain preparation process, namely the wire bundling spacing and the corresponding added mass, by carrying out numerical calculation and analysis before preparing the physical model of the anchor chain, so as to avoid inaccurate restoring force provided by the mooring system during the physical model test caused by too large a spacing at the winding positions, and increased difficulty in preparing the anchor chain and excessive consumption of manpower caused by too small a spacing at the winding positions.

[0049] The working conditions for numerical calculation and analysis in the present invention include restoring stiffness test conditions, free decay conditions, operating conditions, and extreme conditions, and the comprehensive mechanical properties of different anchor chain physical model design schemes under static and dynamic conditions are comprehensively considered.

[0050] In addition, the error weight parameters and comprehensive average error rate selected by the present invention take into account the errors of all working conditions and all time series of different anchor chain physical model design schemes, so as to judge whether the anchor chain physical model design scheme is feasible, comprehensive and reasonable. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0052] Figure 1 A schematic diagram of the structure of the system for preparing the physical model.

[0053] Figure 2 It is a structural schematic diagram of the electronic device.

[0054] 100, physical model preparation system; 110, coupled numerical model construction module; 120, mooring line tension time history calculation module; 130, comparison and iteration module; 140, communication module; 200, electronic device; 210, processor; 220, memory; 230, transceiver. DETAILED DESCRIPTION

[0055] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0056] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. In the description of the above embodiments, specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

[0057] Embodiment 1: This embodiment provides a method for preparing a physical model of an offshore floating structure mooring system, comprising the following steps:

[0058] Step S1, using the initial chain and lead wire to establish a physical model preparation scheme for anchor chains with different weight distributions; specifically comprising:

[0059] S11. Determine the model scale ratio λ according to the size limit of the test site and the requirements of the test conditions; and determine the total mass M of the anchor chain prototype. F , the scale ratio λ and the density ratio γ of seawater to fresh water determine the total mass M of the anchor chain physical model P :

[0060] ;

[0061] According to the total length L of the anchor chain prototype F , the scale ratio λ determines the total length L of the anchor chain physical model P :

[0062] ;

[0063] Furthermore, the initial chain S0 of the anchor chain physical model is purchased, and its total mass is M0, which should be close to and slightly smaller than M P ; The unit length mass m0 of the initial chain S0 of the anchor chain physical model:

[0064] ;

[0065] S12. Measure the length l of a single link of the anchor chain physical model P ; Calculate the length of a single link of the anchor chain prototype l F :

[0066] l F =l P ×λ;

[0067] Furthermore, the additional mass M of the anchor chain physical model is calculated E :M E =M P -M0;

[0068] S13, set additional mass M E The number of groups is N1, N2, ..., N T ;

[0069] The spacing of the additional mass is ;

[0070] The additional mass added at each position is .

[0071] Step S2, establishing an offshore floating structure coupling numerical model C0, whose mooring system is recorded as an initial mooring system, and the initial mooring system adopts an anchor chain prototype; simulating the test conditions, and calculating the initial mooring cable tension time history T0 of the initial mooring system;

[0072] Specifically include:

[0073] S21, using the time domain analysis program SIMA to establish an offshore floating structure coupling numerical model C0, in which the mooring system is modeled with an anchor chain prototype;

[0074] S22. Simulate the test conditions, including the recovery stiffness test condition, free decay condition, operation condition, and extreme condition;

[0075] S23, between the bottom end point (x b , z b ) and the vertex point (x t , z t ) anchor chain is divided into overhanging anchor chain and bottom lying anchor chain;

[0076] The overhanging anchor chain satisfies the following formula:

[0077] ;

[0078] Among them, t b represents the tangent line at the bottom of the catenary, t t represents the tangent line at the top of the catenary, w represents the effective weight of the catenary per unit length, T h represents the horizontal component of the catenary tension, EA represents the axial stiffness of the catenary; L F Represents the total length of the anchor chain prototype.

[0079] The bottom anchor chain satisfies the following formula:

[0080] ;

[0081] Where θ represents the seafloor inclination angle, s Δ Represents the length of the bottom lying section, T t represents the apical tension, T b represents the bottom tension, μ represents the axial friction coefficient of the seabed;

[0082] T t With T b The following formula is also satisfied:

[0083] T t =T b +w(sinθ+μcosθ) L F .

[0084] S24, through the iterative solution method, according to the horizontal component T of the line tension of the hanging section anchor chain h , the vertical displacement change Δz of the top of the suspended anchor chain determines the catenary chain shape, and the position information of the fairlead hole at this time is obtained (x t , z t ) and mooring cable tension.

[0085] S25. Conduct coupling analysis of mooring and floating body; extract initial mooring cable tension time history T0; initial mooring cable tension time history T0 is a matrix of size m×n, where m represents the number of working conditions, and n represents the amount of data under the simulation of this working condition.

[0086] Step S3: Establish an offshore floating structure coupling numerical model C1 to calculate the hybrid mooring cable tension time history T of the hybrid mooring system. t ;

[0087] Specifically include:

[0088] S31. The mooring system of the coupled numerical model C1 of the offshore floating structure is recorded as a hybrid mooring system, that is, the mooring cable is distributed in two sections, in which the unit length mass of one section of the anchor chain is consistent with the unit length mass of the initial chain, and the unit length mass of the other section of the anchor chain is ; Wherein, m0 is the mass per unit length of the initial chain; M E is the additional mass added to the anchor chain physical model; the number of groups of additional mass added is N1, that is, t=1; l P The length of a single link of the anchor chain physical model;

[0089] S32, simulate the test conditions, including the recovery stiffness test conditions, free decay conditions, operating conditions, and extreme conditions; the conditions simulated by C1 should be completely consistent with those of C0;

[0090] S33. In addition to the mooring tension calculation formula of the anchor chain prototype, the influence of concentrated mass must also be considered:

[0091] ;

[0092] Among them, w c Represents the weight of the concentrated mass, t + ,t - Represent the tangent lines at the top and bottom of the concentrated mass, t s represents the seafloor slope, T + , T - Respectively represent the tension at the top and bottom of the concentrated mass;

[0093] S34, conducting coupling analysis of mooring and floating body; extracting the hybrid mooring cable tension history T1 of the mooring system; the hybrid mooring cable tension history T1 is a matrix of size m×n, where m represents the number of working conditions, n represents the amount of data under the simulation of this working condition, and φ is the error weight parameter of each working condition;

[0094] Step S4, calculating the comprehensive average error rate τ1 of the initial mooring cable tension time history T0 and the hybrid mooring cable tension time history T1;

[0095] The specific formula is as follows:

[0096] .

[0097] Step S5, compare the comprehensive average error rate τ1 and the allowable error rate τ0. When the comprehensive average error rate τ1 is less than the allowable error rate τ0, the current hybrid mooring system is used as the physical model of the mooring system for preparation; that is, the performance of the physical model design of the mooring system is consistent with that of the prototype of the mooring system, and the spacing of the added mass at this time can be adopted. , added quality Prepare the physical model of the mooring system;

[0098] When the comprehensive average error rate τ1 is not less than the allowable error rate τ0, proceed to the next step.

[0099] Step S6: repeating steps S3 to S4, specifically including:

[0100] S61. Establish an offshore floating structure coupling numerical model C2, whose mooring system is recorded as a hybrid mooring system, that is, the mooring cable is distributed in two sections, the unit length mass of one section of the anchor chain is consistent with the unit length mass of the initial chain, and the unit length mass of the other section of the anchor chain is ; Wherein, m0 is the mass per unit length of the initial chain; M E is the additional mass added to the anchor chain physical model; the number of groups of additional mass added is N2, that is, t=2; l P The length of a single link of the anchor chain physical model;

[0101] S62, calculating the hybrid mooring line tension time history T2 of the hybrid mooring system, and simulating the test conditions, including the recovery stiffness test condition, the free decay condition, the operation condition, and the extreme condition; the condition simulated by C2 should be completely consistent with that of C0;

[0102] Conduct coupling analysis of mooring and floating body; extract the hybrid mooring cable tension history T2 of the mooring system; the hybrid mooring cable tension history T2 is a matrix of size m×n, where m represents the number of working conditions, n represents the amount of data under the simulation of this working condition, and φ is the error weight parameter of each working condition;

[0103] S63, calculating the comprehensive average error rate τ2 between the hybrid mooring line tension time history T2 and the initial mooring line tension time history T0:

[0104] ;

[0105] S64, compare the size of the comprehensive average error rate τ2 and the allowable error rate τ0. When the comprehensive average error rate τ2 is less than the allowable error rate τ0, the current hybrid mooring system is prepared as the physical model of the mooring system, and the spacing of the added mass at this time can be used. , added quality Prepare the physical model of the mooring system;

[0106] If the comprehensive average error rate τ2 is greater than the allowable error rate τ0, continue to repeat until the comprehensive average error rate τ t Less than the allowable error rate τ0; determine the spacing of the added mass at this time , added quality , tied with lead wire.

[0107] The technical solution of the present invention has the following technical effects compared with the prior art:

[0108] The present invention can determine the key parameters of the anchor chain preparation process, namely the wire bundling spacing and the corresponding added mass, by carrying out numerical calculation and analysis before preparing the physical model of the anchor chain, so as to avoid inaccurate restoring force provided by the mooring system during the physical model test caused by too large a spacing at the winding positions, and increased difficulty in preparing the anchor chain and excessive consumption of manpower caused by too small a spacing at the winding positions.

[0109] The working conditions for numerical calculation and analysis in the present invention include restoring stiffness test conditions, free decay conditions, operating conditions, and extreme conditions, and the comprehensive mechanical properties of different anchor chain physical model design schemes under static and dynamic conditions are comprehensively considered.

[0110] In addition, the error weight parameters and comprehensive average error rate selected by the present invention take into account the errors of all working conditions and all time series of different anchor chain physical model design schemes, so as to judge whether the anchor chain physical model design scheme is feasible, comprehensive and reasonable.

[0111] Example 2: This example will be based on Figure 1 and Figure 2 A physical model preparation system 100 and an electronic device 200 are described.

[0112] Among them, refer to Figure 1 As shown, the physical model preparation system 100 of the offshore floating structure mooring system includes:

[0113] A coupled numerical model building module 110, which is used to establish a plurality of coupled numerical models of offshore floating structures according to the type of mooring system;

[0114] A mooring cable tension time history calculation module 120, which is used to calculate the mooring cable tension time history of each offshore floating structure coupled numerical model;

[0115] A comparison iteration module 130, which is used to select a physical model of the mooring system according to a comprehensive average error rate;

[0116] The communication module 140 is used to communicate with external devices.

[0117] It should be understood that the physical model preparation system 100 here is embodied in the form of a functional module. The term "module" here may refer to an application specific integrated circuit (ASIC), an electronic circuit, a processor (such as a shared processor, a proprietary processor or a group processor, etc.) and a memory for executing one or more software or firmware programs, a merged logic circuit and / or other suitable components that support the described functions. In an optional example, those skilled in the art can understand that the physical model preparation system 100 can be specifically the electronic device 200 in the above embodiment, or the function of the electronic device 200 in the above embodiment can be integrated in the physical model preparation system 100, and the physical model preparation system 100 can be used to execute the various processes and / or steps corresponding to the electronic device 200 in the above method embodiment. To avoid repetition, it will not be repeated here.

[0118] The physical model preparation system 100 has the function of implementing the corresponding steps performed by the electronic device 200 of the preparation method in Example 1; the above functions can be implemented by hardware, or by hardware executing corresponding software. The hardware or software includes one or more modules corresponding to the above functions. For example, the above acquisition module can be a communication interface, such as a transceiver interface.

[0119] Reference Figure 2 As shown, in this embodiment, an electronic device 200 is provided, including:

[0120] A processor 210, and a memory 220 and a transceiver 230 communicatively connected to the processor;

[0121] The memory 220 stores computer-executable instructions; the transceiver 230 is used to send and receive data;

[0122] The processor 210 executes the computer-executable instructions stored in the memory 220 to implement the preparation method in Example 1.

[0123] 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 portion 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.

[0124] It should be understood that in the embodiment 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, digital signal processors (DSP), application-specific integrated circuits (ASIC), field programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or the processor may also be any conventional processor, etc.

[0125] In the implementation process, each step of the above method can be completed by an integrated logic circuit of hardware in the processor 210 or an instruction in the form of software. The steps of the method disclosed in conjunction with the embodiment of the present application can be directly embodied as a hardware processor for execution, or a combination of hardware and software modules in the processor 210 for execution. The software module can be located in a mature storage medium in the art such as a random access memory, a flash memory, a read-only memory, a programmable read-only memory or an electrically erasable programmable memory, a register, etc. The storage medium is located in a memory, and the processor executes the instructions in the memory, and completes the steps of the above method in conjunction with its hardware. To avoid repetition, it is not described in detail here.

[0126] Embodiment 3: In this embodiment, a computer-readable storage medium is provided, in which computer-executable instructions are stored. When the computer-executable instructions are executed by a processor, they are used to implement the preparation method in Embodiment 1.

[0127] In the 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 only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as 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 mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0128] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0129] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0130] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application can be essentially or partly embodied in the form of a software product that contributes to the prior art. The computer software product is stored in a storage medium and includes several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in the various embodiments of the present application. The aforementioned storage media include: various media that can store program codes, such as USB flash drives, mobile hard disks, read-only memories (ROM), random access memories (RAM), magnetic disks or optical disks.

[0131] 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.

[0132] The above are only 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 a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A method for preparing a physical model of an offshore floating structure mooring system, characterized in that: The following steps are involved: Step S1, using the initial chain to establish a physical model preparation plan for the anchor chain; Step S2, establishing an offshore floating structure coupling numerical model C0, whose mooring system is recorded as an initial mooring system, and the initial mooring system adopts an anchor chain prototype; simulating the test conditions, and calculating the initial mooring cable tension time history T0 of the initial mooring system; Step S3, establish an offshore floating structure coupling numerical model Ct, whose mooring system is recorded as a hybrid mooring system, and the hybrid mooring system adopts two sections of spaced anchor chains, wherein the unit length mass of one section of the anchor chain is consistent with the unit length mass of the initial chain, and the unit length mass of the other section of the anchor chain is ; Wherein, m0 is the mass per unit length of the initial chain; M E Additional mass added to the anchor chain physical model; N t is the number of additional quality groups, t=1,2,3,…,T; l P The length of a single link of the anchor chain physical model; Calculate the hybrid mooring line tension time history T of the hybrid mooring system t ; Step S4, calculating the initial mooring line tension time history T0 and the hybrid mooring line tension time history T t The comprehensive average error rate τ t ; Step S5: Compare the comprehensive average error rate τ t and the size of the allowable error rate τ0, when the comprehensive average error rate τ t When it is less than the allowable error rate τ0, the current hybrid mooring system is used as the physical model of the mooring system for preparation. When the comprehensive average error rate τ t If it is not less than the allowable error rate τ0, repeat steps S3-S4 until the comprehensive average error rate τ t When it is less than the allowable error rate τ0, the current hybrid mooring system is prepared as the physical model of the mooring system.

2. The method for preparing a physical model of an offshore floating structure mooring system according to claim 1, characterized in that: The calculation process of the initial mooring cable tension time history T0 in step S2 is: The anchor chain physical model is located between the bottom end point (x b , z b ) and the vertex point (x t , z t ) anchor chain is divided into overhanging anchor chain and bottom lying anchor chain; Through the iterative solution method, according to the horizontal component T of the line tension of the hanging section anchor chain h , the vertical displacement change Δz of the top of the suspended anchor chain determines the catenary chain shape, and the position information of the fairlead hole at this time is obtained (x t , z t ) and mooring cable tension; Conduct coupled analysis of mooring and buoyancy; extract initial mooring cable tension time history T0.

3. The method for preparing a physical model of an offshore floating structure mooring system according to claim 2, characterized in that: The overhanging anchor chain satisfies the following formula: ； Among them, t b represents the tangent line at the bottom of the catenary, t t represents the tangent line at the top of the catenary, w represents the effective weight of the catenary per unit length, T h represents the horizontal component of the catenary tension, EA represents the axial stiffness of the catenary; L F Represents the total length of the anchor chain prototype.

4. The method for preparing a physical model of an offshore floating structure mooring system according to claim 3, characterized in that: The bottom anchor chain satisfies the following formula: ； Where θ represents the seafloor inclination angle, s Δ Represents the length of the bottom lying section, T t represents the apical tension, T b represents the bottom tension, μ represents the axial friction coefficient of the seabed; T t With T b The following formula is also satisfied: T t =T b +w(sinθ+μcosθ) L F ; L F Represents the total length of the anchor chain prototype.

5. The method for preparing a physical model of an offshore floating structure mooring system according to claim 1, characterized in that: The hybrid mooring line tension time history T in step S4 t The calculation process is: Based on the initial mooring line tension time history T0, the concentrated mass w is added c The calculation process: ； Among them, w c Represents the weight of the concentrated mass, t + ,t - Represent the tangent lines at the top and bottom of the concentrated mass, t s represents the seafloor slope, T + 、T - Respectively represent the tension at the top and bottom of the concentrated mass; Conduct coupling analysis of mooring and floating body; extract the hybrid mooring cable tension time history T of hybrid mooring system t .

6. The method for preparing a physical model of an offshore floating structure mooring system according to claim 1, characterized in that: The comprehensive average error rate τ in step S5 t The calculation formula is: ； The initial mooring cable tension time history T0 is a matrix of size m×n, where m represents the number of working conditions and n represents the amount of data under the simulation of this working condition; the hybrid mooring cable tension time history T t It is a matrix of size m×n, where m represents the number of working conditions, n represents the amount of data under the simulation of this working condition, and φ is the error weight parameter of each working condition.

7. The method for preparing a physical model of an offshore floating structure mooring system according to claim 1, characterized in that: In step S5, when the comprehensive average error rate τ t When it is less than the allowable error rate τ0, the spacing of the additional mass of the current hybrid mooring system is , the added mass .

8. A physical model preparation system for an offshore floating structure mooring system, characterized in that: To implement the physical model preparation method according to any one of claims 1 to 7, the physical model preparation system comprises: A coupled numerical model building module, which is used to establish multiple coupled numerical models of offshore floating structures according to the type of mooring system; A mooring cable tension time history calculation module, which is used to calculate the mooring cable tension time history of each offshore floating structure coupled numerical model; A comparison iteration module, which is used to select a physical model of the mooring system according to a comprehensive average error rate; The communication module is used to communicate with external devices.

9. An electronic device, characterized in that: include: A processor, and a memory and a transceiver communicatively connected to the processor; The memory stores computer-executable instructions; the transceiver is used to send and receive data; The processor executes the computer-executable instructions stored in the memory to implement the physical model preparation method according to any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer-executable instructions, which, when executed by a processor, are used to implement the physical model preparation method according to any one of claims 1 to 7.

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