Method and device for digital simulation verification of ship structure strength

Abstract

The application provides a ship structure strength digital simulation verification method and device. The method comprises the following steps: constructing a three-dimensional digital model of a ship structure according to ship design drawings and design specifications; setting load and boundary conditions according to the operation environment and design requirements of the ship; performing finite element division on the constructed three-dimensional digital model by using finite element analysis software, and performing finite element analysis calculation according to the set load and boundary conditions to obtain the mechanical response of stress and strain of the ship structure; verifying and evaluating the ship structure strength according to the finite element analysis result, and if the requirement is not met, optimizing the three-dimensional digital model, and re-performing finite element analysis and strength verification. The application solves the problems of insufficient model precision, low calculation efficiency and low reliability of verification results in the existing ship structure strength verification method.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of ship design and manufacturing, and particularly relates to a ship structure strength digital simulation verification method and device. BACKGROUND

[0002] Ship structure strength verification is a key link to ensure the safe operation of ships. It verifies whether the strength and stability of the ship structure under various working conditions meet the design requirements through detailed mechanical analysis and calculation of the ship structure. In this process, various load factors such as static water pressure, wave impact force, and cargo weight, as well as the material properties, geometric shape, and connection mode of the structure itself need to be considered.

[0003] In the field of ship structure strength verification, traditional methods often rely on simplified physical models and manual calculations, which leads to the problem of insufficient model accuracy. Due to the complexity of ship structures, simplified physical models often cannot accurately reflect the real stress distribution and deformation, thereby affecting the accuracy of the verification results. In addition, traditional calculation methods are inefficient and difficult to adapt to large-scale and high-precision calculation requirements. In the ship design process, a large number of strength verifications and analyses need to be performed, and traditional methods often require a large amount of time and computing resources, which limits the design efficiency and innovation capability. At the same time, due to the insufficient model accuracy and low efficiency of the calculation method, the results obtained by the traditional verification method are not highly reliable, which may lead to safety hazards during ship operation and pose a threat to personnel and property safety. SUMMARY

[0004] The purpose of the present application is to provide a ship structure strength digital simulation verification method and device, which can at least partially solve the above technical problems existing in the prior art.

[0005] One aspect of the present application provides a ship structure strength digital simulation verification method. The method comprises: constructing a three-dimensional digital model of a ship structure according to ship design drawings and design specifications; setting load and boundary conditions according to the operating environment and design requirements of the ship; using finite element analysis software to perform finite element division on the constructed three-dimensional digital model, and performing finite element analysis and calculation according to the set load and boundary conditions to obtain the mechanical response of stress and strain of the ship structure; verifying and evaluating the ship structure strength according to the finite element analysis results, and if the requirements are not met, optimizing the design of the three-dimensional digital model and re-performing finite element analysis and strength verification.

[0006] Further, the method further comprises: visualizing the finite element analysis results and the strength verification results to generate intuitive charts; and / or generating a verification report according to the strength verification results.

[0007] Further, the method further comprises: performing fine processing on the three-dimensional digital model.

[0008] Further, the fine processing on the three-dimensional digital model comprises: setting material nonlinear parameters and geometric nonlinear parameters of the ship; and performing nonlinear analysis on the three-dimensional digital model by using a nonlinear solver to obtain stress and strain responses of the ship structure.

[0009] Further, the fine processing on the three-dimensional digital model comprises one or more of the following processing modes: for a complex connection part of the ship structure, a more fine modeling method is used, including: mixed use of shell elements and solid elements; mesh refinement is performed near the connection part of the ship structure; for the connection part where contact behavior exists in the ship structure, contact parameters are set.

[0010] Further, the fine processing on the three-dimensional digital model comprises: performing uncertainty analysis on boundary conditions by using a probability and statistics method to evaluate the influence of boundary conditions on the strength of the ship structure.

[0011] Further, the fine processing on the three-dimensional digital model comprises: performing welding residual stress simulation on the welding part of the ship structure to evaluate the influence of welding residual stress on the strength of the ship structure.

[0012] Further, the setting of loads and boundary conditions comprises:

[0013] Load type determination and calculation, including: identifying main load types in the ship operating environment, the load types including one or more of hydrostatic pressure, wave load and wind load; calculating specific values of each load according to ship design requirements and operating environment and related hydrodynamics and wind engineering theory, and performing statistical analysis or time domain simulation on the load;

[0014] Boundary condition setting, including: determining boundary condition types according to the characteristics of the ship structure and the requirements of simulation analysis, the boundary condition types including one or more of fixed constraint, hinged constraint and sliding constraint; setting the position and parameters of the boundary condition in the three-dimensional digital model; verifying the load and boundary condition, and adjusting and optimizing the load and boundary condition according to the verification result.

[0015] Further, the finite element division on the constructed three-dimensional digital model comprises: performing adaptive mesh division on the three-dimensional digital model according to the characteristics of the ship structure and the load distribution.

[0016] Further, the adaptive meshing of the three-dimensional digital model according to the characteristics of the ship structure and the load distribution comprises: constructing a stress distribution function of the ship structure; and dynamically adjusting the density of meshing according to the stress distribution function of the ship structure, wherein the greater the stress value, the greater the value of the mesh density adjustment factor, and correspondingly, the mesh density increases.

[0017] Further, the finite element analysis calculation according to the set load and boundary condition comprises: performing finite element analysis according to the set load and boundary condition and using parallel computing technology.

[0018] Further, the checking and evaluation of the strength of the ship structure comprises: checking and evaluating the strength of the ship structure by using the allowable stress method.

[0019] Further, the strength of the ship structure is determined according to the following stress calculation formula:

[0020]

[0021] wherein, represents the strength of the ship structure evaluated by using the allowable stress method, represents the maximum stress value in the ship structure, σ represents the allowable stress value, and the material parameters and the structure parameters are material parameters and structure parameters affecting the strength of the ship structure,

[0022] When the strength of the ship structure calculated by the stress calculation formula is less than or equal to the allowable stress value, it is determined that the ship structure meets the strength requirement; when the strength of the ship structure calculated by the stress calculation formula is greater than the allowable stress value, it is determined that the strength of the ship structure is insufficient.

[0023] Further, the optimization design of the three-dimensional digital model comprises one or more of the following modes: increasing the thickness of the ship structure; changing the material properties of the ship structure; optimizing the shape of the ship structure; and optimizing the connection mode of the ship structure.

[0024] Another aspect of the present application provides a ship structure strength digital simulation checking device. The device comprises a memory, a processor, and a computer program stored in the memory and executable on the processor, and the processor implements the steps of the ship structure strength digital simulation checking method described above when executing the computer program.

[0025] The ship structure strength digital simulation checking method and device of the present application solve the problems of insufficient model precision, low calculation efficiency, and low reliability of the checking result in the existing ship structure strength checking method. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 A flowchart of a ship structure strength digital simulation verification method according to an embodiment of the present application.

[0027] Figure 2 A schematic block diagram of a ship structure strength digital simulation verification device according to an embodiment of the present application. DETAILED DESCRIPTION

[0028] The exemplary embodiments will be described in detail hereinbelow with reference to the drawings. The following description is presented in the context of the drawings, in which like numbers represent like or similar elements for the same or similar elements unless otherwise described. The embodiments described in the following exemplary embodiments are not meant to represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus consistent with some aspects of the present application as detailed in the appended claims.

[0029] The ship structure strength digital simulation verification method and device according to various embodiments of the present application will be described in detail below with reference to the drawings. The features of the embodiments and implementation forms described below can be combined with each other in the case of no conflict.

[0030] Figure 1 A flowchart of a ship structure strength digital simulation verification method according to an embodiment of the present application is disclosed. As shown in Figure 1 The ship structure strength digital simulation verification method according to an embodiment of the present application can include steps S1 to S4.

[0031] In step S1, a three-dimensional digital model of the ship structure can be constructed according to the ship design drawings and design specifications by using, for example, CAD / CAE (Computer-Aided Design / Computer Aided Engineering) software.

[0032] In some embodiments, the ship structure strength digital simulation verification method according to the present application can further include a step of performing fine processing on the three-dimensional digital model. Thus, the accuracy and precision of the model can be further improved.

[0033] Since the ship structure can exhibit significant nonlinear behavior in the process of being subjected to force, such as material nonlinearity and geometric nonlinearity. These nonlinear factors can have an important influence on the strength of the ship structure, and therefore need to be considered in the simulation verification. Therefore, optionally, the fine processing on the three-dimensional digital model can include steps S11 and S12.

[0034] In step S11, the material nonlinearity parameters and the geometric nonlinearity parameters of the ship are set.

[0035] For material nonlinear behavior:

[0036] Identify material properties: First, the nonlinear properties of the materials used, such as plasticity, creep, strain hardening, etc., need to be accurately identified. This usually relies on the mechanical property test data of the materials;

[0037] Set up material models: In the simulation software, according to the identified material properties, set up the corresponding material models. For example, for plastic materials, you need to define the yield criterion, flow rule and hardening rule, etc.;

[0038] Parameter calibration: Use experimental data to calibrate the parameters in the material model to ensure the accuracy of the simulation results.

[0039] For geometric nonlinearities:

[0040] Identify geometric nonlinear sources: Analyze the geometric nonlinear behavior that may occur in the ship structure under stress, such as large deformation, buckling, etc.;

[0041] Set up geometric nonlinear options: In the simulation software, enable the geometric nonlinear options and set the corresponding solution parameters, such as iteration method, convergence criterion, etc.

[0042] In step S12, a nonlinear solver is used to perform nonlinear analysis on the three-dimensional digital model to obtain the stress and strain response of the ship structure.

[0043] Select the solver: According to the complexity and size of the problem, select the appropriate nonlinear solver. Common nonlinear solvers include Newton-Raphson method, arc length method, etc.

[0044] Set the solution parameters: According to the requirements of the solver, set the corresponding solution parameters, such as initial step size, maximum number of iterations, convergence tolerance, etc.

[0045] Execute the solution: Run the solver to perform nonlinear analysis on the three-dimensional digital model to obtain the stress, strain and other responses of the ship structure.

[0046] The following will describe in detail the process of solving using a nonlinear solver, including the input, solving process and output of the nonlinear solver.

[0047] The input of the nonlinear solver mainly includes the following aspects:

[0048] Objective function: This is the function to be minimized or maximized, usually representing some performance index of the structure, such as stress, strain energy or displacement, etc.

[0049] Initial guess: Provide an initial solution to the solver, which helps the solver converge to the final solution faster. The initial guess can be randomly generated or set based on the physical background of the problem.

[0050] Constraints: These conditions limit the range of feasible solutions. In ship structure simulation, constraints may include geometric constraints (such as the size and shape of the structure), physical constraints (such as the mechanical properties of materials and boundary conditions), and other specific engineering constraints. Nonlinear constraints may include material yield conditions, geometric deformation limits, or contact conditions, etc.

[0051] Nonlinear parameters: These parameters describe the nonlinear behavior of the structure, such as material plasticity parameters, geometric nonlinear parameters (such as large deformation parameters), and welding residual stress, etc.

[0052] The solving process of the nonlinear solver is usually an iterative process, aiming to find a solution that satisfies the constraints and makes the objective function optimal. This process may include the following steps:

[0053] Initialization: Set the internal state of the solver, including iteration counters, convergence criteria, etc.

[0054] Iterative solving: In each iteration, the solver will calculate the gradient and Hessian matrix (or approximation) of the objective function based on the current solution and constraints, and use this information to update the solution. This process may involve complex mathematical operations such as linear algebra, optimization algorithms, and numerical analysis, etc.

[0055] Convergence check: After each iteration, the solver checks whether the current solution meets the convergence criteria. Convergence criteria may be based on the amount of change in the solution, the gradient or Hessian matrix norm of the objective function, etc. If the convergence criteria are met, the solving process ends; otherwise, continue iterating.

[0056] The output of the nonlinear solver mainly includes the following aspects:

[0057] Optimal solution: This is the solution that satisfies the constraints and makes the objective function optimal. In ship structure simulation, the optimal solution may represent the stress distribution, deformation, or other performance indicators of the structure.

[0058] Objective function value: The value of the objective function calculated at the optimal solution. This value can be used to evaluate the performance of the structure or for comparative analysis.

[0059] Convergence information: Including the number of iterations, the satisfaction of the convergence criteria, etc. These information helps to understand the stability and efficiency of the solving process.

[0060] Other outputs: Depending on the specific implementation of the solver and user requirements, other relevant information such as the gradient vector, Hessian matrix, Lagrange multipliers, etc. may also be output.

[0061] In summary, when using a nonlinear solver for solving, it is necessary to clearly input information (including objective function, initial guess, constraint conditions, and nonlinear parameters, etc.), and go through an iterative solving process to find the optimal solution. Finally, the solver will output the optimal solution and related information for the user to analyze and evaluate.

[0062] Optionally, the fine processing of the three-dimensional digital model can further include step S13.

[0063] In step S13, more detailed modeling methods can be used for complex connection parts of the ship structure, such as welded joints, bolt connections, etc. For example, mixed use of shell elements and solid elements can be used to help accurately simulate the stress distribution and deformation of the connection parts.

[0064] In the early stage of model establishment, the geometric shape, material properties, boundary conditions, etc. of the model can be preliminarily determined according to the characteristics of the ship structure, load distribution, and analysis requirements. At this time, the model may use relatively simple element types (such as all using solid elements or shell elements) to quickly build and analyze.

[0065] As the analysis deepens, it may be found that the stress distribution and deformation of some parts are more complex and need more detailed modeling methods to accurately simulate. The mixed use of shell elements and solid elements is one of the methods of fine processing, which combines the advantages of shell elements in simulating thin shell structures and the ability of solid elements in simulating three-dimensional solid structures.

[0066] According to the analysis results of the preliminary model, it can be determined which parts need to use mixed use of shell elements and solid elements. These parts usually include connection parts, complex geometry parts, or stress concentration parts, etc.

[0067] After determining the mixed use parts, the model can be modified and refined accordingly. This includes adding shell elements and solid elements in the parts that need mixed use, and ensuring that the connection and transition between them are smooth and reasonable.

[0068] After mixed use of shell elements and solid elements, the corresponding nonlinear parameters (such as material nonlinearity, geometric nonlinearity, etc.) need to be set, and a nonlinear solver is used for solving. This helps to more accurately simulate the stress distribution and deformation of the connection parts.

[0069] The combination of shell elements and solid elements can significantly improve the computational accuracy of the model, especially when simulating complex connection parts, which helps to more accurately assess the strength and durability of the ship structure.

[0070] Optionally, the fine processing of the three-dimensional digitized model can further include step S14.

[0071] In step S14, mesh refinement can be performed near the connection parts of the ship structure to improve computational accuracy. At the same time, ensure the transition smoothness of the mesh, avoid stress concentration phenomenon.

[0072] Optionally, the fine processing of the three-dimensional digitized model can further include step S15.

[0073] In step S15, contact parameters such as friction coefficient, contact stiffness, etc. can be set at the connection parts where contact behavior exists in the ship structure.

[0074] Optionally, the fine processing of the three-dimensional digitized model can further include step S16.

[0075] In step S16, uncertainty analysis can be performed on the boundary conditions by using a probabilistic statistical method to assess the impact of boundary conditions on the strength of the ship structure, thereby improving the robustness of the model.

[0076] When considering the uncertainty of boundary conditions, the main purpose of using a probabilistic statistical method for uncertainty analysis is to assess the impact of the variability of boundary conditions on the strength of the structure. This uncertainty analysis can quantify the impact of changes in input parameters (i.e. boundary conditions) on the simulation output (such as structural strength), thereby helping to identify and mitigate potential risks and providing a more reliable basis for decision-making.

[0077] Uncertainty analysis mainly focuses on the following aspects:

[0078] Probability distribution of boundary conditions: First, the probability distribution of boundary conditions needs to be determined. This is usually based on historical data, expert judgment or experimental data. For example, temperature, pressure, load and other boundary conditions may follow a normal distribution, lognormal distribution or other types of distribution.

[0079] Variability of structural strength: Through simulation analysis, the variability of structural strength under different boundary conditions can be obtained. This helps to understand the performance of the structure under different working conditions.

[0080] Sensitivity analysis: Sensitivity analysis can reveal which boundary conditions have the greatest impact on structural strength. This helps to prioritize these key factors in the design process.

[0081] Reliability Assessment: Based on the results of uncertainty analysis, the reliability of the structure can be assessed. For example, the failure probability or safety margin of the structure under certain loads can be calculated.

[0082] The method of assessing the impact of boundary condition uncertainty on structural strength typically includes the following steps:

[0083] Data Collection: Collect historical data, experimental data, or expert judgment about the boundary conditions;

[0084] Determine Probability Distribution: Based on the collected data, determine the probability distribution of the boundary conditions;

[0085] Modeling: Establish a finite element model, taking into account factors such as material nonlinearity, geometric nonlinearity, etc.;

[0086] Simulation: Use a nonlinear solver to solve the model and simulate the structural response under different boundary conditions;

[0087] Uncertainty Analysis: Use probabilistic statistical methods to analyze the simulation results and assess the impact of boundary condition uncertainty on structural strength. This usually involves calculating mean, variance, covariance, etc. statistical parameters, as well as drawing probability density function, cumulative distribution function, etc. graphics;

[0088] Result Interpretation and Decision: Based on the results of uncertainty analysis, interpret the impact of boundary condition uncertainty on structural strength and make decisions accordingly. For example, design modifications may be needed to improve the reliability of the structure or reduce the failure probability.

[0089] Uncertainty analysis is usually performed in the later stages of refinement. After establishing the finite element model and setting the corresponding boundary conditions and loads, factors such as material nonlinearity, geometric nonlinearity, etc. are considered, and a nonlinear solver is used for solving. Then, after completing the refinement steps such as handling complex connection parts and optimizing meshing strategy, uncertainty analysis is performed to assess the impact of boundary condition uncertainty on structural strength. This step is usually in the later stages of the entire analysis process, but in practice it may be adjusted according to specific needs and resource conditions.

[0090] Optionally, the refinement of the three-dimensional digital model can also include step S17.

[0091] In step S17, the welding residual stress simulation of the welding part of the ship structure can be performed, such as thermal elastic-plastic finite element analysis, to assess the impact of welding residual stress on the strength of the ship structure.

[0092] The specific steps of welding residual stress simulation are as follows:

[0093] Establishing the Welding Model: Based on the actual welding process and structural characteristics, a finite element model is established that includes the weld, base material, and surrounding structure. The shape, size, and location of the weld are determined, as well as the heat source model during the welding process (such as Gaussian heat source, double-elliptical heat source, etc.).

[0094] Defining Material Properties: Define the material properties of the weld and base material that change with temperature, including thermal conductivity, specific heat capacity, yield strength, elastic modulus, etc. These properties are usually obtained through experimental data or literature and need to be calibrated according to the actual situation.

[0095] Setting Boundary Conditions and Loads: Define the boundary conditions during the welding process, such as initial temperature, ambient temperature, convective heat transfer coefficient, etc. Apply the welding heat source as a load to simulate the temperature distribution and changes during the welding process.

[0096] Performing Thermal Analysis: Perform thermal analysis using finite element analysis software to calculate the temperature field distribution during the welding process. This step usually includes solving the heat conduction equation to obtain the temperature change of the weld and surrounding structure over time.

[0097] Performing Elastic-Plastic Analysis: Based on the thermal analysis, perform elastic-plastic analysis to simulate the stress and strain changes during the welding process; consider the nonlinear behavior of the material (such as yield, hardening, etc.), as well as the thermal stress and residual stress generated during the welding process.

[0098] Extracting Residual Stresses: After completing the elastic-plastic analysis, extract the residual stress distribution after the welding cools down. These residual stresses will be used as input conditions for subsequent structural analysis to evaluate their impact on structural strength.

[0099] The simulation of welding residual stresses is usually carried out after the initial model is established and during the refinement stage. Specifically, it can be located between the following steps:

[0100] Initial Model Establishment: Establish a finite element model that includes the main structure and connection points;

[0101] Welding Residual Stress Simulation: Based on the above model, add the simulation of the weld and welding process, perform thermal-elastic-plastic finite element analysis, and extract residual stresses;

[0102] Subsequent Analysis: Use the extracted residual stresses as input conditions for subsequent structural strength analysis, fatigue analysis, or optimization design, etc.

[0103] Optionally, to further improve the accuracy and precision of the three-dimensional digital model, the three-dimensional digital model can also be verified and checked. By comparing experimental results and simulation results, the accuracy and reliability of the three-dimensional digital model are verified. If significant differences are found, the three-dimensional digital model can be further adjusted and optimized.

[0104] The ship structure strength digital simulation verification method of the present application considers nonlinear factors such as nonlinear behavior of materials and geometric nonlinearities, and sets corresponding nonlinear parameters, and uses a nonlinear solver for solving, which makes the model closer to the actual situation and can more accurately reflect the mechanical behavior of the ship structure under complex working conditions.

[0105] The ship structure strength digital simulation verification method of the present application uses a more refined modeling method when dealing with complex connection parts, such as the mixed use of shell elements and solid elements, which accurately simulates the stress distribution and deformation of the connection parts and avoids errors caused by simplification. In addition, a simulation method of welding residual stress is introduced to evaluate its influence on the structural strength, further optimizing the model and improving the reliability of the analysis.

[0106] The ship structure strength digital simulation verification method of the present application also considers the uncertainty of boundary conditions, and uses a probability and statistics method to analyze the uncertainty of boundary conditions. Because in actual operation, the boundary conditions are often affected by many factors and have certain uncertainty. Through uncertainty analysis, the influence of boundary conditions on structural strength can be more comprehensively evaluated to provide a more scientific basis for design.

[0107] In step S2, the load and boundary conditions can be set according to the operating environment and design requirements of the ship.

[0108] In some embodiments, the setting of the load and boundary conditions in step S2 can include steps S21 to S23.

[0109] In step S21, the load type is determined and calculated.

[0110] The main load type in the ship operating environment is identified, which may include, but is not limited to, one or more of static water pressure, wave load and wind load.

[0111] According to the ship design requirements and operating environment parameters such as water depth, wave period, wave height, wind speed, and related hydrodynamics and wind engineering theory, the specific values of each load are calculated, and the spatio-temporal distribution characteristics of the load, the randomness of the wave load, the directionality and variability of the wind load are also considered, and statistical analysis or time domain simulation is performed on the load.

[0112] In step S22, the boundary conditions are set.

[0113] According to the characteristics of the ship structure and the requirements of the simulation analysis, the type of boundary condition is determined, which may include, but is not limited to, one or more of fixed constraints, hinged constraints and sliding constraints.

[0114] The position and parameters of the boundary conditions are set in the three-dimensional digital model, including but not limited to the fixed constraint application point, the rotation axis of the hinged constraint, and the rigidity.

[0115] The interaction between the boundary conditions and the loads is considered, the dynamic response of the hull and the mooring system under wave loads is considered, and it is ensured that the setting of the boundary conditions can truly reflect the stress condition of the ship in actual operation.

[0116] In step S23, the loads and boundary conditions are verified, for example, by physical tests, comparative analysis or expert review, and the loads and boundary conditions are adjusted and optimized according to the verification results. Thus, the main load types in the ship operation environment, including static water pressure, wave load and wind load, can be comprehensively identified and accurately calculated, while considering the spatial and temporal distribution characteristics and randomness of the loads, so that the load setting is closer to the actual situation. This not only improves the accuracy of the analysis, but also provides more accurate data support for subsequent structural strength verification.

[0117] The ship structure strength digital simulation verification method of the present application determines reasonable boundary condition types according to the characteristics of the ship structure and the requirements of the simulation analysis, and accurately sets the position and parameters of the boundary conditions in the digital model. In addition, the interaction between the boundary conditions and the loads is also considered, such as the dynamic response of the hull and the mooring system under wave loads, which helps to ensure that the setting of the boundary conditions can truly reflect the stress condition of the ship in actual operation. Finally, through verification and adjustment, the set loads and boundary conditions are verified by physical tests, comparative analysis or expert review, and adjusted and optimized according to the verification results, further improving the accuracy and reliability of the analysis.

[0118] In step S3, the finite element analysis software is used to perform finite element division on the constructed three-dimensional digital model, and finite element analysis calculation is performed according to the set loads and boundary conditions to obtain the mechanical response of the stress and strain of the ship structure.

[0119] In some embodiments, finite element analysis is performed according to the set loads and boundary conditions and parallel computing technology is used to improve the calculation efficiency, and the specific implementation and formula description are as follows:

[0120] Let the total calculation amount of the finite element analysis be When parallel computing technology is used, the total calculation amount is divided into sub-tasks, each of which is completed by an independent computing node , and the calculation amount of each sub-task is , then the total calculation amount of parallel computing can be represented as:

[0121]

[0122] The efficiency improvement of parallel computing can be measured by the speedup ratio , which is defined as:

[0123]

[0124] where is the time required for serial computing, is the time required for parallel computing when computing nodes are completely independent and load-balanced, the speedup ratio approaches .

[0125] By dividing the total computational load of finite element analysis into multiple sub-tasks and assigning them to independent computing nodes for completion, parallel processing of computing tasks is achieved. This method not only takes full advantage of the multi-core multi-processor of modern computers, but also ensures the efficient operation of each computing node through load balancing strategies.

[0126] By defining the total computational load and the computational load of each sub-task, as well as the representation of the total computational load of parallel computing, the mathematical foundation of parallel computing technology is clearly demonstrated. At the same time, the concept of speedup ratio is introduced to measure the efficiency improvement of parallel computing, which can intuitively reflect the time advantage of parallel computing compared to serial computing. In particular, when each computing node is completely independent and load-balanced, the speedup ratio approaches the ideal value, which further proves the significant effect of parallel computing technology in improving computing efficiency.

[0127] In some embodiments, the finite element division of the constructed three-dimensional digital model includes adaptive mesh division based on the characteristics of the ship structure and the load distribution. This helps to further improve the accuracy of the model while maintaining computing efficiency.

[0128] In some embodiments, adaptive mesh division of the three-dimensional digital model based on the characteristics of the ship structure and the load distribution can include steps S31 and S32.

[0129] In step S31, a stress distribution function of the ship structure is constructed.

[0130] In finite element analysis, the stress distribution function is a key factor in determining the grid density adjustment factor when combining adaptive mesh division techniques to improve computational accuracy and efficiency. This stress distribution function is usually obtained through the following steps:

[0131] Step S311: Preliminary analysis.

[0132] First, a preliminary finite element analysis is performed. In this step, the structure is modeled and analyzed using a relatively uniform mesh density. The purpose of the preliminary analysis is to obtain the general stress distribution of the structure, providing a basis for subsequent adaptive mesh refinement.

[0133] Step S312: Stress distribution extraction.

[0134] After the preliminary analysis is completed, stress distribution data is extracted from the analysis results. These data typically include the stress values of each node and the distribution of stress in the structure. These data will be used to construct the stress distribution function.

[0135] Step S313: Constructing stress distribution function.

[0136] Based on the extracted stress distribution data, a stress distribution function is constructed. This function is usually a mathematical expression or an interpolation function that can describe the variation of stress in the structure. When constructing the stress distribution function, factors such as the geometry of the structure, material properties, and load distribution need to be considered.

[0137] Step S314: Verification and adjustment.

[0138] After construction, the stress distribution function is verified and adjusted. By comparing with the preliminary analysis results, the accuracy and applicability of the function are checked. If the function cannot well describe the stress distribution, adjustment and optimization are needed.

[0139] In step S32, the mesh density is dynamically adjusted according to the stress distribution function of the ship structure, where the larger the stress value, the larger the value of the mesh density adjustment factor, and correspondingly, the mesh density increases.

[0140] The stress distribution function that has been verified and adjusted can be used to guide adaptive mesh refinement. According to the value of the stress distribution function, the mesh density adjustment factor is dynamically adjusted. In the stress concentration area, due to the large stress value, the value of the mesh density adjustment factor is also large, resulting in an increase in mesh density to more accurately capture the stress variation. In the area with small stress, the value of the mesh density adjustment factor is small, and the mesh density is correspondingly reduced to improve the calculation efficiency.

[0141] Let the initial mesh density be , the mesh density is dynamically adjusted according to the stress distribution function The adjusted mesh density can be represented as:

[0142]

[0143] where, is the mesh density adjustment factor, which is determined according to the stress distribution function the value of the stress distribution function, the grid density is dynamically adjusted, in the stress concentration area, the value is larger, the grid density increases; in the stress smaller area, the value is smaller, the grid density decreases.

[0144] The adaptive meshing technology can dynamically adjust the grid density according to the stress distribution function, automatically increase the grid density in the stress concentration area, and capture the stress change more finely, thereby improving the calculation accuracy. At the same time, in the stress smaller area, the grid density is reduced, the calculation amount is reduced, and the calculation efficiency is improved. This way of dynamically adjusting the grid density not only guarantees the calculation accuracy of the key area, but also optimizes the overall calculation performance, making the finite element analysis more efficient and accurate.

[0145] By setting the initial grid density and dynamically adjusting the grid density according to the stress distribution function. Among them, the grid density adjustment factor is a key parameter, which dynamically adjusts the grid density according to the value of the stress distribution function. The adaptive meshing technology can automatically adjust the grid density according to the stress distribution inside the structure without human intervention, thereby greatly improving the automation and accuracy of the analysis. In addition, this technology can also be customized according to the stress characteristics of different structures, making the meshing more flexible and efficient.

[0146] Combined with parallel computing technology and adaptive meshing technology, the total calculation time of finite element analysis can be represented as:

[0147]

[0148] where, is the calculation efficiency improvement coefficient brought by adaptive meshing technology, which reflects the improvement degree of adaptive meshing relative to fixed meshing in calculation efficiency, the value of the stress distribution function depends on the accuracy and rationality of the grid density adjustment factor .

[0149] At the same time, combined with the use of these two technologies, the accuracy improvement of finite element analysis can be measured by the error reduction ratio , which is defined as:

[0150]

[0151] where, is the error when using fixed meshing, is the error when using adaptive meshing, by optimizing the grid density adjustment factor , the error can be reduced to improve the accuracy of finite element analysis.

[0152] In the process of adjusting the mesh density adjustment factor to reduce errors and improve the accuracy of finite element analysis, evaluating the quality of the mesh density adjustment factor setting and determining the timing of optimizing this factor are key issues. The quality of the mesh density adjustment factor setting can be determined by the following steps.

[0153] Error analysis: Directly compare the errors between the finite element analysis results with different mesh density adjustment factors and the theoretical solution or experimental data. The smaller the error, the better the setting of the mesh density adjustment factor. Relative error or absolute error can be used to measure, depending on the nature and requirements of the problem.

[0154] Convergence analysis: Perform a series of finite element analysis under different mesh density adjustment factors, and observe the trend of the analysis results with the change of the mesh density adjustment factor. If the analysis results gradually converge to the theoretical solution or experimental data with the optimization of the mesh density adjustment factor, it means that the setting of the mesh density adjustment factor is effective.

[0155] Trade-off between computational efficiency and accuracy: Evaluate the impact of the mesh density adjustment factor on computational efficiency. Although finer meshes can improve accuracy, they will also increase computational cost. It is necessary to find the best balance between computational efficiency and accuracy under the premise of ensuring a certain accuracy.

[0156] Visual inspection: Use visualization tools to check the mesh density adjusted model to ensure that the grid is densified in the stress concentration area and sparse in the area with small stress. This helps to visually evaluate the rationality of the mesh density adjustment factor.

[0157] Optimizing the mesh density adjustment factor is usually done after the initial finite element model is established and the initial mesh density is set. The specific steps are as follows:

[0158] Preliminary modeling and meshing: According to the characteristics of the structure and the distribution of the load, establish the initial finite element model and set the initial mesh density;

[0159] Perform finite element analysis: Use the initial mesh density to perform finite element analysis and obtain preliminary analysis results;

[0160] Evaluate error and convergence: According to the preliminary analysis results, evaluate the error size and perform convergence analysis; if the error is large or the convergence is poor, the mesh density adjustment factor needs to be optimized;

[0161] Optimize the mesh density adjustment factor: According to the results of error analysis and convergence analysis, adjust the value of the mesh density adjustment factor. Trial and error method, optimization algorithm (such as genetic algorithm, particle swarm algorithm, etc.) or empirical rules can be used to adjust the factor;

[0162] Re-perform finite element analysis: re-perform finite element analysis using the optimized mesh density adjustment factor.

[0163] Repeat the above steps until the mesh density adjustment factor that meets the accuracy requirement is found.

[0164] The ship structure strength digital simulation verification method of the present application adopts an optimized mesh division strategy. According to the characteristics of the structure and the load distribution, adaptive mesh division technology or other optimization methods are used. Not only is the calculation accuracy improved, but the calculation efficiency is also significantly improved, making the method more suitable for large-scale, high-precision calculation requirements.

[0165] The ship structure strength digital simulation verification method of the present application combines the use of parallel computing and adaptive optimized mesh, and the total calculation time of finite element analysis is effectively shortened. Among them, the calculation efficiency improvement coefficient brought by adaptive mesh division technology reflects the significant improvement of this technology in calculation efficiency compared with fixed mesh division. This improvement is mainly due to the accuracy and reasonableness of the mesh density adjustment factor, which makes the mesh division more flexible and efficient, and can dynamically adjust according to the stress distribution of different regions, thereby greatly reducing the calculation amount while ensuring the calculation accuracy. In addition, the introduction of parallel computing technology further speeds up the calculation process, making large-scale, high-precision finite element analysis possible.

[0166] By comparing the error when using fixed mesh division and adaptive mesh division, the advantages of adaptive mesh division technology in improving analysis accuracy can be intuitively reflected. The introduction of this index not only provides a scientific basis for evaluating the accuracy of finite element analysis, but also points out the direction for optimizing the mesh density adjustment factor and further improving the analysis accuracy. By continuously adjusting and optimizing the mesh density adjustment factor, the error can be further reduced, making the results of finite element analysis more accurate and reliable.

[0167] In step S4, according to the results of finite element analysis, the ship structure strength is verified and evaluated. If the requirements are not met, the three-dimensional digital model is optimized and designed, and the finite element analysis and strength verification are re-performed.

[0168] In some embodiments, the allowable stress method or the limit state design method can be used to verify and evaluate the strength of the ship structure.

[0169] When the allowable stress method is selected as the evaluation method, complex stress calculation formulas need to be introduced to accurately determine the strength performance of the structure.

[0170] The stress calculation formula can be expressed as:

[0171]

[0172] wherein, represents the ship structure strength evaluated by using the allowable stress method, represents the maximum stress value in the ship structure, σ represents the allowable stress value, and the material parameters and the structure parameters are the material parameters and the structure parameters affecting the ship structure strength, respectively.

[0173] In the comparison process, when the ship structure strength calculated by the stress calculation formula is less than or equal to the allowable stress value σ, it is determined that the ship structure meets the strength requirement; when the ship structure strength calculated by the stress calculation formula is greater than the allowable stress value σ, it is determined that the ship structure is insufficient in strength.

[0174] The stress calculation formula is based on the basic principles of material mechanics, which is used to calculate the maximum stress value in the structure and compare it with the allowable stress value.

[0175] The stress calculation formula is:

[0176] σ = F / A

[0177] wherein, σ represents the maximum stress value in the ship structure, which is the key parameter to be calculated and used to evaluate the strength performance of the structure; F represents the external force or internal force acting on the structure, which depends on the specific analysis situation and the type of load borne by the ship structure; and A represents the area of the force section, which is a factor that must be considered when calculating the stress and affects the distribution and size of the stress.

[0178] The material parameters mainly reflect the mechanical properties and physical characteristics of the material itself, and have a direct impact on the strength performance of the structure. Common material parameters include: elastic modulus E: reflecting the stress-strain relationship of the material within the elastic deformation range, which is a measure of the stiffness of the material; yield strength σs: the stress value at which the specimen begins to deform plastically in the tensile test; strength limit σb: the maximum stress value before the specimen breaks in the tensile test, also known as the tensile strength; fatigue limit σ-1: the maximum stress value at which the material does not break after a certain number of cycles under alternating stress; hardness: indicating the ability of the material to resist local pressure and deformation, the higher the hardness, the better the wear resistance of the material in general; toughness: the ability of the material to absorb energy without breaking when subjected to impact load, materials with good toughness can better resist brittle fracture.

[0179] Structural parameters mainly reflect the geometry, size, and connection methods of the structure, which have a significant impact on the stress distribution and strength performance of the structure. Common structural parameters include: cross-sectional size: such as the cross-sectional width and height of beams, the cross-sectional diameter of columns, etc., which directly affect the load-carrying capacity and stress distribution of the structure; wall thickness: for structures such as shells and pipes, wall thickness is a key factor affecting their strength and stability; connection method: such as welding, bolt connection, riveting, etc., different connection methods will affect the overall strength and stiffness of the structure; geometry: the geometry of the structure, such as circular, square, rectangular, etc., will affect the distribution and size of stress; span-to-height ratio: for structures such as beams and plates, the ratio of their span to height will affect the overall stability and load-carrying capacity of the structure.

[0180] The maximum stress value is usually calculated by finite element analysis (FEA) or other structural analysis methods. These methods are based on the principles of material mechanics and solid mechanics, and can simulate the stress distribution of the structure under load.

[0181] Finite element analysis (FEA) is a numerical method used to solve problems of stress, strain, and displacement in complex structures. By dividing the structure into a finite number of elements and performing mechanical analysis on each element, the stress distribution of the entire structure can be obtained. In finite element analysis, parameters such as the elastic modulus and Poisson's ratio of the material, as well as the geometry, size, and load conditions of the structure, need to be input. Through calculation, the maximum stress value in the structure can be obtained.

[0182] In addition to finite element analysis, other structural analysis methods such as analytical methods and difference methods can also be used to calculate the maximum stress value in the structure. These methods are usually suitable for structures with regular shapes and simple loads.

[0183] Allowable stress value is determined based on the strength performance of the material and the use requirements of the structure, which reflects the maximum stress value that the material can withstand under certain conditions without failure.

[0184] Allowable stress value is usually determined based on the yield strength or tensile strength of the material. Yield strength is the stress value at which the material begins to deform plastically, while tensile strength is the maximum stress value that the material can withstand before breaking. By consulting material manuals or conducting material tests, strength performance data such as yield strength and tensile strength of the material can be obtained.

[0185] To ensure the safety and reliability of the structure, a safety factor is usually introduced to reduce the allowable stress value. The size of the safety factor depends on the importance of the structure, the variability of the load, the stability of the material properties, and other factors. The allowable stress value can be obtained by dividing the yield strength or tensile strength of the material by the safety factor. For example, for plastic materials, the allowable stress value is usually equal to the yield strength divided by the safety factor; for brittle materials, the allowable stress value may be equal to the tensile strength divided by the safety factor.

[0186] In some cases, the allowable stress value may be directly given by the relevant engineering specifications and standards. These specifications and standards usually take into account the performance of the material, the use conditions of the structure, the safety requirements, and other factors, and provide corresponding tables or formulas of allowable stress values.

[0187] The application of stress calculation formulas fully considers the influence of material parameters and structural parameters on the strength of the structure, making the evaluation results more close to the actual situation. In the comparison process, if the maximum stress value in the structure calculated by the formula is less than or equal to the allowable stress value, it is determined that the structure meets the strength requirements, otherwise it indicates that the structural strength is insufficient. This determination standard is clear and explicit, which is convenient for quickly and accurately evaluating the strength performance of the structure. In addition, when the structural strength is insufficient, the model can be optimized and designed, which provides a clear guidance direction for further improving the structure.

[0188] The application of the allowable stress method is not fixed, but needs to be adjusted according to the specific engineering background and material characteristics. For example, for different types of materials, their allowable stress values may be different; for different structural forms, their stress distribution and stress concentration may also be different. Therefore, when applying the allowable stress method for strength evaluation, these factors need to be fully considered to ensure the accuracy and reliability of the evaluation results. In addition, with the continuous development of computer technology, numerical simulation methods are increasingly widely used in strength evaluation. By combining numerical simulation methods and the allowable stress method, the stress distribution and strength performance of the structure can be more deeply understood, providing more comprehensive support for the optimization design of the structure.

[0189] In some embodiments, the optimization design of the three-dimensional digital model may, for example, include but is not limited to increasing the thickness of the ship structure and / or changing the material properties of the ship, in order to reduce the maximum stress value or increase the allowable stress value After the optimization design is completed, finite element analysis needs to be performed again, and the stress calculation formula needs to be applied again for strength checking, until the ship structure meets the strength requirements. In the face of insufficient structural strength of the ship, optimization design such as increasing the thickness of the structure and changing the material properties can be used to reduce the maximum stress value or increase the allowable stress value Thus, the ship structure is ensured to meet the strength requirement.

[0190] The implementation of the optimization design measure is not a one-time process, but needs to be iteratively adjusted according to the results of the finite element analysis and the strength check. After each optimization design is completed, the finite element analysis needs to be performed again to obtain the updated stress distribution and maximum stress value. Then, the strength check is performed again by applying the stress calculation formula to determine whether the ship structure after optimization design meets the strength requirement. This process needs to be repeated until the ship structure strength reaches the preset standard. Although this iterative optimization method increases the workload of calculation and analysis, it can ensure that the final ship structure design scheme not only meets the strength requirement, but also has high economic efficiency and feasibility.

[0191] In some embodiments, the optimization design of the three-dimensional digital model may, for example, further include but is not limited to optimizing the structural shape of the ship and / or optimizing the structural connection mode of the ship to improve the structural strength and safety of the ship. Through comprehensive optimization of the structural shape, connection mode, etc., not only the structural strength of the ship is effectively improved, but also the safety is further enhanced, providing a more solid guarantee for the navigation of the ship.

[0192] The optimization of the structural shape often involves adjusting the geometric shape of the overall or partial structure of the ship. Such adjustment may be based on in-depth analysis of stress distribution and load transmission path, aiming to optimize the distribution of stress by changing the geometric shape of the structure, reduce stress concentration phenomenon, and thus reduce the risk of structural failure. For example, for the hull plate shell structure, the bending and torsional resistance can be optimized by adjusting the plate thickness, curvature, etc.; for the connection part, the reliability and durability of the connection can be improved by optimizing the shape and size of the connecting piece.

[0193] At the same time, the optimization of the connection mode is also an important means to improve the structural strength and safety of the ship. In the ship structure, the connection part is often a high-risk area of stress concentration and fatigue damage. Therefore, by improving the connection mode, such as using high-strength bolt connection, welding technology, etc., the strength and fatigue life of the connection part can be significantly improved. In addition, for complex structures, new connection technologies such as gluing, riveting, etc. can be considered to further improve the reliability and stability of the connection.

[0194] In some embodiments, the ship structure strength digital simulation checking method of the present application may further include step S5.

[0195] In step S5, the finite element analysis result and the strength checking result can be visualized to generate intuitive charts; and / or, a checking report is generated according to the strength checking result to provide powerful data support and intuitive analysis means for the optimization design of the ship structure.

[0196] Generating intuitive charts can include generating charts of stress nephograms and strain nephograms to intuitively show the stress and strain distribution of the ship structure. By generating charts of stress nephograms and strain nephograms, the stress and strain distribution of the ship structure can be intuitively and clearly shown, which provides engineers with more intuitive and convenient analysis means and greatly improves the accuracy and efficiency of the ship structure strength evaluation.

[0197] The visualization of the stress nephograms and the strain nephograms also has high flexibility and scalability. For example, key data points are extracted, stress concentration coefficients are calculated, and fatigue life prediction is performed to meet different analysis requirements.

[0198] The ship structure strength digital simulation checking method of the present application solves the problems of insufficient model accuracy, low calculation efficiency, and low reliability of checking results in the existing ship structure strength checking method.

[0199] Compared with the prior art, the ship structure strength digital simulation checking method of the present application can have at least the following beneficial technical effects:

[0200] The ship structure strength digital simulation checking method of the present application uses a three-dimensional digital model constructed by, for example, CAD / CAE software, which is refined to more accurately reflect the true geometric shape and material properties of the ship structure, providing a solid foundation for subsequent finite element analysis and strength checking. Secondly, according to the operating environment and design requirements of the ship, various load factors and boundary conditions are considered to make the analysis results more close to the actual situation, improve the reliability of the checking results, and use efficient finite element analysis software to perform fine finite element division on the digital model and accurate calculation according to the set load and boundary conditions. This not only improves the calculation efficiency, but also makes the analysis results more accurate, which can accurately reflect the stress and strain of the ship structure under various working conditions, strictly check and evaluate the strength of the ship structure, and if the requirements are not met, the model is optimized and redesigned, and this iterative process ensures the safety and reliability of the ship structure strength. Finally, the visualization of the checking results and the generation of the report make the analysis results more intuitive and easy to understand, and the detailed checking report generated provides strong support for subsequent design improvement and decision-making.

[0201] The present application also provides a ship structure strength digital simulation checking device 200. Figure 2A schematic block diagram of a ship structure strength digital simulation verification device 200 according to an embodiment of the present application is disclosed. As shown in Figure 2 The ship structure strength digital simulation verification device 200 according to an embodiment of the present application includes a processor 201, an internal bus 202, a network interface 203, a memory 204, a nonvolatile memory 205, and can further include other hardware required by the business. The processor 201 can read the corresponding computer program from the nonvolatile memory 205 into the memory 204 and then run to implement the steps of the ship structure strength digital simulation verification method as described above. Of course, in addition to the software implementation, the present application does not exclude other implementation manners, such as logic devices or a combination of software and hardware, etc., that is, the execution subject of the following processing flow is not limited to each logic unit, but can also be hardware or logic.

[0202] It can be understood that, for the convenience of description, the above device is described as each module is described respectively. Of course, in the implementation of the present application, the functions of each module can be implemented in the same or multiple software and / or hardware.

[0203] The ship structure strength digital simulation verification device 200 according to the present application has similar beneficial technical effects to the ship structure strength digital simulation verification method described above, and therefore will not be described here.

[0204] The ship structure strength digital simulation verification method and device provided by the embodiments of the present application are described in detail above. The ship structure strength digital simulation verification method and device according to the embodiments of the present application are described by applying specific examples in this paper, and the above embodiments are only used to help understand the core idea of the present application, and do not limit the present application. It should be pointed out that, for those skilled in the art, without departing from the spirit and principles of the present application, some improvements and modifications can be made to the present application, and these improvements and modifications should also fall within the protection scope of the appended claims of the present application.

Claims

1. A digital simulation verification method for ship structural strength, characterized in that: include: Based on the ship design drawings and design specifications, construct a three-dimensional digital model of the ship structure; The three-dimensional digital model is refined, including: Setting the nonlinear parameters of ship materials includes: first, identifying the nonlinear characteristics of the materials used based on the mechanical property test data, and then setting the corresponding material model in the simulation software based on the identified material characteristics, and the rules that the material definition follows. Setting geometric nonlinear parameters includes: identifying nonlinear sources based on the geometric nonlinear behavior of the ship structure during the stress process, and enabling the geometric nonlinear option in the simulation software and setting the corresponding solution parameters; A nonlinear solver was used to perform nonlinear analysis on the three-dimensional digital model to obtain the stress and strain response of the ship structure. Based on the ship's operating environment and design requirements, loads and boundary conditions are set; wherein, the boundary condition setting includes: Based on the characteristics of the ship structure and the needs of simulation analysis, the boundary condition type is determined, which includes one or more of fixed constraints, hinged constraints, and sliding constraints. Based on the interaction between boundary conditions and loads, including the dynamic response of the hull and mooring system under wave loads, the location and parameters of the boundary conditions are set in the three-dimensional digital model. The loads and boundary conditions are verified, and the loads and boundary conditions are adjusted and optimized accordingly based on the verification results. Finite element analysis software was used to divide the refined three-dimensional digital model into finite element parts, and finite element analysis calculations were performed according to the set loads and boundary conditions to obtain the mechanical response of the ship structure in terms of stress and strain. Based on the finite element analysis results, the structural strength of the ship is verified and evaluated. If the requirements are not met, the three-dimensional digital model is optimized and the finite element analysis and strength verification are performed again.

2. The method as described in claim 1, characterized in that: Also includes: The finite element analysis results and strength verification results are visualized to generate intuitive charts; And / or, A verification report is generated based on the strength verification results.

3. The method as described in claim 1, characterized in that: The refinement of the three-dimensional digital model includes one or more of the following processing methods: For complex connections in ship structures, more refined modeling methods are employed, including: A hybrid approach using shell elements and solid elements is employed. Refine the mesh near the connection points of the ship structure; Contact parameters are set at connection points in the ship structure where there is contact behavior.

4. The method as described in claim 1, characterized in that: The refinement of the three-dimensional digital model includes: Uncertainty analysis of boundary conditions is conducted using probabilistic and statistical methods to assess the impact of boundary conditions on the structural strength of ships.

5. The method as described in claim 1, characterized in that: The refinement of the three-dimensional digital model includes: Welding residual stress was simulated at the welded parts of the ship structure to assess the impact of welding residual stress on the strength of the ship structure.

6. The method as described in claim 1, characterized in that: The set load includes: Load type determination and calculation, including: Identify the main load types in the ship's operating environment, including one or more of hydrostatic pressure, wave loads, and wind loads; Based on ship design requirements, operating environment, and relevant hydrodynamic and wind engineering theories, the specific values ​​of each load are calculated, and statistical analysis or time-domain simulation of the loads is performed.

7. The method as described in claim 1, characterized in that: The process of performing finite element analysis on the refined 3D digital model includes: Based on the characteristics of the ship's structure and load distribution, an adaptive mesh generation method is adopted for the three-dimensional digital model.

8. The method as described in claim 7, characterized in that: The adaptive mesh generation of the three-dimensional digital model based on the characteristics of the ship structure and load distribution includes: The stress distribution function of the ship structure is constructed; The mesh density is dynamically adjusted based on the stress distribution function of the ship structure. The higher the stress value, the higher the mesh density adjustment factor, and the higher the mesh density.

9. The method as described in claim 1, characterized in that: The finite element analysis calculation based on the set loads and boundary conditions includes: Finite element analysis is performed based on the set loads and boundary conditions, and parallel computing technology is used.

10. The method as described in claim 1, characterized in that: Verification and evaluation of ship structural strength includes: The allowable stress method is used to verify and evaluate the strength of ship structures.

11. The method as described in claim 10, characterized in that: The strength of a ship's structure can be determined using the following stress calculation formula: in, This represents the structural strength of the ship as assessed using the allowable stress method. σ represents the maximum stress value in the ship's structure, σ represents the allowable stress value, and the material parameters and structural parameters are the ship's material parameters and structural parameters, respectively. When the structural strength of the ship calculated by the stress calculation formula is less than or equal to the allowable stress value, the ship structure is deemed to meet the strength requirements; when the structural strength of the ship calculated by the stress calculation formula is greater than the allowable stress value, the ship structure is deemed to be insufficient in strength.

12. The method as described in claim 1, characterized in that: The optimization design of the three-dimensional digital model includes one or more of the following methods: Increase the structural thickness of the ship; Changing the material properties of a ship; Optimize the structural shape of the ship; Optimize the structural connection methods of ships.

13. A digital simulation and verification device for ship structural strength, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the steps of the digital simulation verification method for ship structural strength as described in any one of claims 1 to 12.

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