Simulation method and device for calculating the structural strength of a net of a steel deep-sea aquaculture platform

Abstract

The present application relates to offshore aquaculture equipment technical field, especially to a kind of simulation method and device for calculating the structure strength of deep sea steel aquaculture platform net clothes.The method comprises: obtaining the structural geometric characteristics of offshore aquaculture platform;Wherein, the structural geometric characteristics include a plurality of frame node coordinates;Based on the structural geometric characteristics, determine the geometric finite element model of offshore aquaculture platform net clothes;Using geometric finite element model and preset simulation equation for simulation, obtain the structural strength of platform net clothes;Wherein, the structural strength includes the strength of each net line of platform net clothes;Wherein, the preset simulation equation includes single net line wind load simulation equation, single net line wave force simulation equation, net clothes biological attachment effect simulation equation.Through the above configuration mode, the present application can improve the accuracy of calculating the structural strength of platform net clothes.

Description

Technical Field

[0001] This invention relates to the field of marine aquaculture equipment technology, and in particular to a simulation method and apparatus for calculating the strength of the net structure of a deep-sea steel aquaculture platform. Background Technology

[0002] In practical engineering, the current method used by classification societies to calculate the breaking load of netting has limitations. First, its simplified method for calculating hydrodynamic loads has systematic biases. Because it treats the entire netting as a coarse rod and only calculates the total force on the upstream area using Morrison's formula, it fails to obtain the axial force distribution of individual ropes / nets. This macroscopic simplification leads to a systematic underestimation of the actual forces acting on the connectors.

[0003] Secondly, classification societies currently employ overly conservative safety margins in their mesh design. This is because they directly use the mesh breaking force as the input load for overall component analysis. This conservative approach leads to inaccurate calculations of loads compared to actual hydrodynamic values, consequently resulting in inaccurate strength calculations for the mesh structure of deep-sea steel aquaculture platforms.

[0004] Based on this, the present invention proposes a simulation method and apparatus for calculating the strength of the net structure of a deep-sea steel aquaculture platform to solve the above-mentioned technical problems. Summary of the Invention

[0005] This invention describes a simulation method and apparatus for calculating the strength of the netting structure of a deep-sea steel aquaculture platform, which can improve the accuracy of calculating the strength of the platform's netting structure.

[0006] According to a first aspect, the present invention provides a simulation method for calculating the strength of the netting structure of a deep-sea steel aquaculture platform, the method comprising:

[0007] Obtain the structural geometric features of the offshore aquaculture platform; wherein, the structural geometric features include the coordinates of multiple frame nodes;

[0008] Based on the aforementioned structural geometric features, a geometric finite element model of the netting for offshore aquaculture platforms is determined.

[0009] The structural strength of the platform mesh is obtained by using the geometric finite element model and the preset simulation equations; wherein, the structural strength includes the strength of each wire of the platform mesh.

[0010] The preset simulation equations include simulation equations for wind load on a single net cable, simulation equations for wave force on a single net cable, and simulation equations for biological adhesion effect of the netting.

[0011] According to a second aspect, the present invention provides a simulation device for calculating the strength of the net structure of a deep-sea steel aquaculture platform, comprising:

[0012] The acquisition unit is configured to acquire the structural geometric features of an offshore aquaculture platform; wherein the structural geometric features include the coordinates of multiple frame nodes;

[0013] The first data processing unit is configured to determine the geometric finite element model of the netting of the offshore aquaculture platform based on the structural geometric features.

[0014] The second data processing unit is configured to perform simulation using the geometric finite element model and preset simulation equations to obtain the structural strength of the platform mesh; wherein, the structural strength includes the strength of each wire of the platform mesh.

[0015] The preset simulation equations include simulation equations for wind load on a single net cable, simulation equations for wave force on a single net cable, and simulation equations for biological adhesion effect of the netting.

[0016] Thirdly, embodiments of this specification also provide an electronic device, including a memory and a processor, wherein the memory stores a computer program, and when the processor executes the computer program, it implements the method described in any embodiment of this specification.

[0017] Fourthly, embodiments of this specification also provide a computer-readable storage medium having a computer program stored thereon, which, when executed in a computer, causes the computer to perform the methods described in any embodiment of this specification.

[0018] According to the simulation method and apparatus for calculating the structural strength of the netting structure of a deep-sea steel aquaculture platform provided by this invention, the structural geometric features of the offshore aquaculture platform are first obtained through 3D scanning or analysis of design drawings. These structural geometric features include the coordinates of multiple frame nodes. Based on these frame node coordinates, a geometric finite element model of the offshore aquaculture platform netting is constructed using finite element analysis software (such as ANSYS or ABAQUS). During the modeling process, the netting is decomposed into single-strand netting elements. Element parameters and frame node coordinates are defined based on the actual mesh size, wire diameter, and material properties (such as elastic modulus and Poisson's ratio) to construct the geometric finite element model of the offshore aquaculture platform netting, ensuring that the model can realistically reproduce the actual loading state and stress boundaries of the netting on the platform. Subsequently, the geometric finite element model is used to perform simulation by substituting preset simulation equations: these preset simulation equations include single-strand netting wind load simulation equations, single-strand netting wave force simulation equations, and netting biological attachment effect simulation equations. Thus, this invention simulates the strength of each wire of the netting on an offshore aquaculture platform. Compared with the traditional method that treats the netting as a thick rod, it improves the accuracy of calculating the structural strength of the platform netting and effectively avoids the problems of load simplification deviation and overly conservative safety margin in the traditional method. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 A schematic flowchart illustrating a simulation method for calculating the strength of a deep-sea steel aquaculture platform net structure according to one embodiment is shown.

[0021] Figure 2 A schematic block diagram of a simulation apparatus for calculating the strength of the netting structure of a deep-sea steel aquaculture platform according to one embodiment is shown. Detailed Implementation

[0022] The solution provided by the present invention will now be described with reference to the accompanying drawings.

[0023] Figure 1 This diagram illustrates a simulation method for calculating the strength of the netting structure of a deep-sea steel aquaculture platform according to one embodiment. It is understood that this method can be executed by any device, equipment, platform, or cluster of devices with computing and processing capabilities. Figure 1 As shown, the method includes:

[0024] Step 100: Obtain the structural geometric features of the offshore aquaculture platform; wherein, the structural geometric features include the coordinates of multiple frame nodes;

[0025] Step 102: Based on the structural geometric features, determine the geometric finite element model of the netting of the offshore aquaculture platform;

[0026] Step 104: Perform simulation using the geometric finite element model and preset simulation equations to obtain the structural strength of the platform mesh; whereby the structural strength includes the strength of each wire of the platform mesh.

[0027] The preset simulation equations include the simulation equations for wind load on a single net cable, wave force on a single net cable, and biological adhesion effect of the netting.

[0028] In this embodiment, the structural geometric features of the offshore aquaculture platform are first obtained through 3D scanning or analysis of design drawings. These features include the coordinates of multiple frame nodes. Based on these coordinates, a geometric finite element model of the aquaculture platform's netting is constructed using finite element analysis software (such as ANSYS or ABAQUS). During the modeling process, the netting is decomposed into single-strand netting elements. Element parameters and frame node coordinates are defined according to the actual mesh size, wire diameter, and material properties (such as elastic modulus and Poisson's ratio) to construct the geometric finite element model of the offshore aquaculture platform's netting, ensuring that the model accurately reflects the actual loading state and stress boundaries of the netting on the platform. Subsequently, the geometric finite element model is used to perform simulations by substituting preset simulation equations. These preset simulation equations include simulation equations for wind load on a single netting wire, wave force on a single netting wire, and simulation equations for the biological attachment effect of the netting. Thus, this invention simulates the strength of each wire of the netting on an offshore aquaculture platform. Compared with the traditional method that treats the netting as a thick rod, it improves the accuracy of calculating the structural strength of the platform netting and effectively avoids the problems of load simplification deviation and overly conservative safety margin in the traditional method.

[0029] In one embodiment of the present invention, the geometric finite element model of the netting of an offshore aquaculture platform is determined based on structural geometric features, including:

[0030] Based on the coordinates of the frame nodes, the pole frame of the platform structure is determined; the pole frame includes multiple network lines.

[0031] Each wire in the rod frame of the platform structure is assigned a Morrison element to obtain a geometric finite element model.

[0032] In this embodiment, unlike existing technologies where the mesh is treated as a single, robust rod, this invention requires the frame to fully replicate the spatial distribution of the mesh. Each "rod" corresponds to an actual mesh wire, and the length and spatial orientation of the rod must match the actual specifications and mounting path of the mesh wire to ensure the frame reflects the basic structural characteristics of the mesh. After constructing the rod frame, each "rod" representing a mesh wire is further assigned Morrison element properties. This allows the Morrison elements to accurately simulate the structural mechanical properties of the mesh wire, ultimately resulting in a geometric finite element model. This enables a more realistic simulation of the stress conditions on the mesh.

[0033] In one embodiment of the present invention, a simulation is performed using a geometric finite element model and preset simulation equations to obtain the structural strength of the platform mesh, including:

[0034] Mesh the geometric finite element model to obtain the finite element model for computational analysis;

[0035] The strength of each net wire was obtained by using the finite element model of computational analysis and the simulation equations for wind load, wave force, and biological adhesion effect of a single net wire.

[0036] In this embodiment, the constructed geometric finite element model is first meshed. The meshing process needs to consider the actual size of the mesh wires (such as diameter and length) and the preset mesh size based on the stress characteristics. It is necessary to ensure that the mesh element size matches the cross-sectional size of the mesh wires (avoiding stress calculation distortion due to overly coarse meshes or increased redundant calculations due to overly fine meshes), and also to ensure that the mesh nodes correspond to the mesh frame nodes, ultimately obtaining the finite element model for calculation and analysis. Subsequently, the calculated finite element model is simulated using the wind load simulation equation for a single mesh wire, the wave force simulation equation for a single mesh wire, and the bio-attachment effect simulation equation for the mesh: the strength of each mesh wire is obtained.

[0037] In one embodiment of the present invention, the simulation equation for the wind load of a single network cable is determined by the following formula:

[0038]

[0039] In the formula, The total force of the sea breeze acting on a single network cable, The total force of the ocean current acting on a single network cable, The windward projected area of ​​a single network cable. The current-facing projection surface of a single network cable product, This is the wind pressure coefficient. For design wind speed, The density of water, It is the acceleration due to gravity. The height of a single network cable. The height from the water surface to above the seabed. The drag coefficient, For ocean current speed, This represents the length increment in the vertical direction.

[0040] In this embodiment, the combined wind and air force is a hydrodynamic load acting on the cylindrical structure. This load is formed by the combined action of pressure distribution generated by the surrounding wind field and viscous shear stress. Based on the principle that the theoretical wind pressure acting on a plane and curved surface when air moves at a certain speed is a function of the air's kinetic energy, and the principle that the resistance on an underwater structure is a function of the fluid's kinetic energy, the total combined wind and air force on the column can be represented by a single-strand net cable wind and air load simulation equation. The single-strand net cable wind and air load simulation equation describes the coupling effect between the multi-scale marine environment and the net cage structure, realizing the spatiotemporal evolution reconstruction of the pulsating wind pressure on the net surface under complex wind and flow fields, and accurately simulating the combined wind and air force borne by the net cage structure of marine aquaculture. Accordingly, the accuracy and reliability of structural response prediction under extreme wind conditions can be effectively improved, thereby improving the accuracy of the calculation results.

[0041] In one embodiment of the present invention, the wave force simulation equation for a single network cable is determined by the following formula:

[0042]

[0043] In the formula, This represents the total wave force acting vertically on the network cable. The drag coefficient, The inertia coefficient, The height from the water surface to above the seabed. The density of seawater, The projected area of ​​a discrete single mesh line facing both wind and current. The height of a single network cable. The velocity of the water particles at the axis of the tubing is denoted as .

[0044] In this embodiment, by using the wave force simulation equation of a single wire mesh, the feedback effects of wave diffraction, added mass, and structural motion on the load can be captured, achieving high-fidelity simulation of the wave force time history of a single wire mesh, and providing reliable data input for fatigue and strength assessment of wire mesh structures under complex wave action.

[0045] In one embodiment of the present invention, the simulation equation for the bioattachment effect of the mesh is determined by the following formula:

[0046]

[0047] In the formula, The applicable Reynolds number range is , To calculate the number of individual network cables, This represents the projected area of ​​a single network cable on the wave-facing side. This is for calculating the total area of ​​the netting on the offshore aquaculture platform.

[0048] In this embodiment, by using the biofouling simulation equation, the additional weight, flow obstruction area, and surface roughness of marine aquaculture net cages caused by biofouling can be simulated, thereby improving the accuracy of the simulation results.

[0049] In one embodiment of the present invention, after simulating the structural strength of the platform mesh using a geometric finite element model and preset simulation equations, the method further includes:

[0050] The maximum stress of each wire is determined based on the allowable stress criterion, and the strength of each wire is checked. After the check is completed, the total amount of steel used for the aquaculture platform netting is calculated using the steel consumption calculation equation.

[0051] The equation for calculating steel consumption is determined by the following formula:

[0052]

[0053] In the formula, For the weight of the steel, The radius of a single network cable. The height of a single network cable. For the density of steel, This is the acceleration due to gravity.

[0054] In this embodiment, the strength verification criterion for the discretized single mesh is determined by judging the maximum stress of each discretized single mesh wire using the allowable stress method. The criterion is as follows:

[0055]

[0056] In the formula, The required safety factor according to regulations; The maximum stress calculated for a single network cable. ; The allowable stress of steel material, .

[0057] In this embodiment, based on the discretized single-wire mesh strength verification criteria, the maximum stress of each discretized wire under the most unfavorable load combination can be precisely calculated point by point. This stress is then compared in real-time with the allowable stress of the material, considering a safety factor, achieving full-mesh, all-weather quantitative monitoring of the mesh strength safety margin. Accordingly, potential over-limit wires can be quickly identified and local weak areas located during the design phase, improving the efficiency and accuracy of mesh strength verification and fundamentally ensuring sufficient safety reserves for the structure under extreme working conditions. Using the steel consumption calculation equation, the weight of all wires after strength verification can be accumulated individually to calculate the overall steel consumption of the mesh. By introducing parameters such as the radius, height, and steel density of individual wires, the equation can quickly quantify the material consumption differences under different mesh sizes and wire specifications, providing direct data support for lightweight mesh design, cost optimization, and transportation and installation schemes.

[0058] The foregoing has described specific embodiments of the invention. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps described in the claims may be performed in a different order than that shown in the embodiments and may still achieve the desired results. Furthermore, the processes depicted in the drawings do not necessarily require the specific or sequential order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0059] According to another embodiment, the present invention provides a simulation device for calculating the strength of the net structure of a deep-sea steel aquaculture platform. Figure 2 A schematic block diagram of a simulation apparatus for calculating the strength of the netting structure of a deep-sea steel aquaculture platform according to one embodiment is shown. It will be understood that this apparatus can be implemented by any device, equipment, platform, or cluster of equipment with computing and processing capabilities. Figure 2 As shown, the device includes: an acquisition unit 200, a first data processing unit 202, and a second data processing unit 204. The main functions of each component are as follows:

[0060] The acquisition unit 200 is configured to acquire the structural geometric features of the offshore aquaculture platform; wherein, the structural geometric features include the coordinates of multiple frame nodes;

[0061] The first data processing unit 202 is configured to determine the geometric finite element model of the netting of the offshore aquaculture platform based on the structural geometric features;

[0062] The second data processing unit 204 is configured to perform simulation using the geometric finite element model and preset simulation equations to obtain the structural strength of the platform mesh; wherein, the structural strength includes the strength of each wire of the platform mesh.

[0063] The preset simulation equations include simulation equations for wind load on a single net cable, simulation equations for wave force on a single net cable, and simulation equations for biological adhesion effect of the netting.

[0064] In one embodiment of the present invention, the first data processing unit 202 is configured to perform the following operations:

[0065] Based on the coordinates of the frame nodes, the pole frame of the platform structure is determined; wherein, the pole frame includes multiple network cables;

[0066] Each wire in the rod frame of the platform structure is assigned a Morrison element to obtain the geometric finite element model.

[0067] In one embodiment of the present invention, the second data processing unit 204 is configured to perform the following operations:

[0068] The geometric finite element model is meshed to obtain the finite element model for computational analysis;

[0069] The strength of each wire is obtained by using the finite element model of the calculation and analysis, the simulation equation of the wind load of a single wire, the simulation equation of the wave force of a single wire, and the simulation equation of the biological adhesion effect of the netting.

[0070] In one embodiment of the present invention, the wind load simulation equation for a single network cable is determined by the following formula:

[0071]

[0072] In the formula, The total force of the sea breeze acting on a single network cable, The total force of the ocean current acting on a single network cable, The windward projected area of ​​a single network cable. The projected area of ​​a single network cable facing the current. This is the wind pressure coefficient. For design wind speed, The density of water, It is the acceleration due to gravity. The height of a single network cable. The height from the water surface to above the seabed. The drag coefficient, For ocean current speed, This represents the length increment in the vertical direction.

[0073] In one embodiment of the present invention, the wave force simulation equation for a single network cable is determined by the following formula:

[0074]

[0075] In the formula, This represents the total wave force acting vertically on the network cable. The drag coefficient, The inertia coefficient, The height from the water surface to above the seabed. The density of seawater, The projected area of ​​a discrete single mesh line facing both wind and current. The height of a single network cable. The velocity of the water particles at the axis of the tubing is denoted as .

[0076] In one embodiment of the present invention, the simulation equation for the bioattachment effect of the mesh is determined by the following formula:

[0077]

[0078] In the formula, The applicable Reynolds number range is , To calculate the number of individual network cables, This represents the projected area of ​​a single network cable on the wave-facing side. This is for calculating the total area of ​​the netting on the offshore aquaculture platform.

[0079] In one embodiment of the present invention, after performing simulation using the geometric finite element model and preset simulation equations to obtain the structural strength of the platform mesh, the method further includes:

[0080] The maximum stress of each wire is determined based on the allowable stress criterion, and the strength of each wire is checked. After the check is completed, the total amount of steel used for the aquaculture platform netting is calculated using the steel consumption calculation equation.

[0081] The equation for calculating steel consumption is determined by the following formula:

[0082]

[0083] In the formula, For the weight of the steel, The radius of a single network cable. The height of a single network cable. For the density of steel, This is the acceleration due to gravity.

[0084] According to another embodiment, a computer-readable storage medium is also provided, on which a computer program is stored, which, when executed in a computer, causes the computer to perform a combination Figure 1 The method described.

[0085] According to another embodiment, an electronic device is also provided, including a memory and a processor, wherein the memory stores executable code, and when the processor executes the executable code, it implements a combination... Figure 1 The method described.

[0086] The various embodiments in this invention are described in a progressive manner. Similar or identical parts between embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, the apparatus embodiments are basically similar to the method embodiments, so the description is relatively simple; relevant parts can be referred to the descriptions of the method embodiments.

[0087] Those skilled in the art will recognize that, in one or more of the examples above, the functions described in this invention can be implemented using hardware, software, firmware, or any combination thereof. When implemented in software, these functions can be stored in a computer-readable medium or transmitted as one or more instructions or code on a computer-readable medium.

[0088] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made on the basis of the technical solution of the present invention should be included within the scope of protection of the present invention.

Claims

1. A simulation method for calculating the strength of the netting structure of a deep-sea steel aquaculture platform, characterized in that, The method includes: Obtain the structural geometric features of the offshore aquaculture platform; wherein, the structural geometric features include the coordinates of multiple frame nodes; Based on the aforementioned structural geometric features, a geometric finite element model of the netting for offshore aquaculture platforms is determined. The structural strength of the platform mesh is obtained by using the geometric finite element model and the preset simulation equations; wherein, the structural strength includes the strength of each wire of the platform mesh. The preset simulation equations include the simulation equations for wind load on a single net cable, wave force on a single net cable, and biological adhesion effect of the netting. The simulation equation for the wind load on a single network cable is determined by the following formula: In the formula, The total force of the sea breeze acting on a single network cable, The total force of the ocean current acting on a single network cable, The windward projected area of ​​a single network cable. The current-facing projection surface of a single network cable product, This is the wind pressure coefficient. For design wind speed, The density of water, It is the acceleration due to gravity. The height of a single network cable. The height from the water surface to above the seabed. The drag coefficient, For ocean current speed, This represents the length increment in the vertical direction; The equation for simulating wave force in a single network cable is determined by the following formula: In the formula, This represents the total wave force acting vertically on the network cable. The drag coefficient, The inertia coefficient, The height from the water surface to above the seabed. The density of seawater, The projected area of ​​a discrete single mesh line facing both wind and current. The height of a single network cable. The horizontal velocity of the water particles at the axis of the tubing column; The simulation equation for the bioattachment effect of the mesh was determined by the following formula: In the formula, The applicable Reynolds number range is , To calculate the number of individual network cables, This represents the projected area of ​​a single network cable on the wave-facing side. This is for calculating the total area of ​​the netting on the offshore aquaculture platform.

2. The method according to claim 1, characterized in that, The determination of the geometric finite element model of the marine aquaculture platform netting based on the aforementioned structural geometric features includes: Based on the coordinates of the frame nodes, the pole frame of the platform structure is determined; wherein, the pole frame includes multiple network cables; Each wire in the rod frame of the platform structure is assigned a Morrison element to obtain the geometric finite element model.

3. The method according to claim 2, characterized in that, The simulation, performed using the geometric finite element model and preset simulation equations, yields the structural strength of the platform mesh, including: The geometric finite element model is meshed to obtain the finite element model for computational analysis; The strength of each wire is obtained by using the finite element model of the calculation and analysis, the simulation equation of the wind load of a single wire, the simulation equation of the wave force of a single wire, and the simulation equation of the biological adhesion effect of the netting.

4. The method according to claim 1, characterized in that, After simulating the structural strength of the platform mesh using the aforementioned geometric finite element model and preset simulation equations, the process further includes: The maximum stress of each wire is determined based on the allowable stress criterion, and the strength of each wire is checked. After the check is completed, the total amount of steel used for the aquaculture platform netting is calculated using the steel consumption calculation equation. The equation for calculating steel consumption is determined by the following formula: In the formula, For the weight of the steel, The radius of a single network cable. The height of a single network cable. For the density of steel, This is the acceleration due to gravity.

5. A simulation device for calculating the strength of the netting structure of a deep-sea steel aquaculture platform, characterized in that, For performing the method as described in any one of claims 1-4, comprising: The acquisition unit is configured to acquire the structural geometric features of an offshore aquaculture platform; wherein the structural geometric features include the coordinates of multiple frame nodes; The first data processing unit is configured to determine the geometric finite element model of the netting of the offshore aquaculture platform based on the structural geometric features. The second data processing unit is configured to perform simulation using the geometric finite element model and preset simulation equations to obtain the structural strength of the platform mesh; wherein, the structural strength includes the strength of each wire of the platform mesh. The preset simulation equations include simulation equations for wind load on a single net cable, simulation equations for wave force on a single net cable, and simulation equations for biological adhesion effect of the netting.

6. An electronic device, characterized in that, It includes a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to implement the method as described in any one of claims 1-4.

7. A computer-readable storage medium, characterized in that, It stores a computer program that, when executed in a computer, causes the computer to perform the method described in any one of claims 1-4.

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