Equivalent modeling and analysis method, device and equipment for main bolt of nuclear main pump and medium

Abstract

The application relates to the technical field of nuclear main pump simulation, and proposes a nuclear main pump main bolt equivalent modeling and analysis method, device, equipment and medium, which comprises the following steps: determining a core structure group of nuclear main pump main bolt equivalent modeling and geometric sizes of each component of the core structure group; determining geometric parameters and mechanical property parameters of an initial equivalent model of each component; in a finite element software, constructing a two-dimensional finite element equivalent model according to the geometric parameters, and giving the two-dimensional finite element equivalent model corresponding mechanical property parameters; establishing a displacement transmission relationship between the core structure group and the joint, and completing assembly and building of the two-dimensional finite element equivalent model; performing finite element simulation analysis on the two-dimensional finite element equivalent model, extracting mechanical response data of a key section of the main bolt as input data for main bolt safety analysis. Through the technical scheme, the axial symmetry of the overall model can be ensured, and the actual mechanical properties of the main bolt can be simulated more finely.

Description

Technical Field

[0001] This application relates to the field of nuclear main pump simulation technology, and in particular to a method, apparatus, equipment and medium for equivalent modeling and analysis of the main bolts of a nuclear main pump. Background Technology

[0002] As a core and critical piece of equipment in a nuclear power system, the mechanical safety of the pressure boundary of the main nuclear pump directly determines the operational reliability and safety of the entire unit. Simulation analysis model processing technology is the core support for pressure boundary mechanical analysis. With the widespread application of numerical simulation technology in the nuclear power field, using whole-unit two / three-dimensional simulation analysis models to conduct mechanical safety assessments has become the mainstream method in the industry.

[0003] However, existing simulation analysis techniques have significant contradictions and shortcomings: On the one hand, while detailed 3D simulation models can reproduce complex structural features to a certain extent, they need to handle complex working conditions involving multi-physics coupling, which not only consumes a large amount of computing resources but also generates high labor and time costs, making it difficult to meet the needs of rapid engineering analysis; on the other hand, while simplified 2D simulation models can effectively reduce computational and time costs, their core pain point lies in the lack of standardized design for the equivalent modeling method of bolted connection areas. Existing 2D models have vague equivalent logic for the geometric dimensions of the main bolt, main nut, and threaded holes of the connected components, and have not formed unified rules for determining geometric parameters such as width and axial length; the equivalent calculation of mechanical property parameters (such as section thickness, elastic modulus, and Poisson's ratio) lacks specific formula support and relies heavily on empirical estimation; at the same time, the displacement transmission relationship within the core structural group and between it and the connected components has not been precisely constrained, resulting in the model's inability to accurately reproduce the mechanical transmission characteristics of bolted connections, ultimately leading to a large deviation between the 2D simulation results and actual working conditions, making it difficult to meet the engineering requirements for high-precision analysis of the pressure boundary of the nuclear main pump.

[0004] Currently, there are no established standards and specifications in the industry for two-dimensional equivalent modeling and analysis evaluation of the main bolts of nuclear main pumps. Existing technologies are unable to balance simulation efficiency and analysis accuracy, and cannot meet the needs of engineering digital prototypes for fast, practical, and accurate simulation technology, thus hindering the engineering application of mechanical safety analysis of nuclear main pumps. Summary of the Invention

[0005] This application provides a method, apparatus, equipment, and medium for equivalent modeling and analysis of the main bolts of a nuclear main pump, aiming to solve technical problems such as unreasonable simplification and insufficient accuracy of two-dimensional simulation models in related technologies.

[0006] In a first aspect, embodiments of this application provide an equivalent modeling and analysis method for the main bolts of a nuclear main pump, the method comprising: The core structural group and the geometric dimensions of each component of the core structural group are determined by equivalent modeling of the main bolt of the nuclear main pump. The core structural group includes the main bolt, the main nut and the threaded holes of the assembled parts. Based on the geometric dimensions of each component of the core structure group, determine the geometric parameters and mechanical property parameters of the initial equivalent model of each component; In finite element software, a two-dimensional finite element equivalent model is constructed based on the geometric parameters, and the corresponding mechanical property parameters are assigned to the two-dimensional finite element equivalent model. Establish the displacement transmission relationship within the core structure group and between the core structure group and the assembled component, and complete the assembly and construction of the two-dimensional finite element equivalent model; Finite element simulation analysis was performed on the two-dimensional finite element equivalent model to extract the mechanical response data of the key sections of the main bolt, which was used as input data for the safety analysis of the main bolt.

[0007] In one embodiment, optionally, the geometric parameters of the initial equivalent model include width and axial length; Specifically, based on the outer diameter of the main bolt, the first width of the initial equivalent model of the main bolt is determined according to a preset equal distribution rule, and the first axial length of the initial equivalent model of the main bolt is determined according to the actual axial length of the main nut to which the main bolt belongs. The second width of the initial equivalent model of the main nut is determined according to a preset segmentation rule based on the outer diameter of the main nut and the outer diameter of the main bolt. The second axial length of the initial equivalent model of the main nut is determined according to the actual axial length of the main nut. The geometric parameters of the initial equivalent model of the threaded hole of the assembled part are consistent with the geometric parameters of the initial equivalent model of the main bolt.

[0008] In one embodiment, optionally, the mechanical property parameters of the initial equivalent model of each component include the cross-sectional thickness, and the process of determining the mechanical property parameters includes: Based on the outer diameter, inner diameter and number of bolts of the main bolt, the first section thickness and the second section thickness of the main bolt are calculated using the first preset formula and the second preset formula. Based on the outer diameter of the main nut, the outer diameter and inner diameter of the main bolt, and the number of bolts, the third, fourth, and fifth section thicknesses of the main nut are calculated using the third, fourth, and fifth preset formulas. Based on the hole distribution diameter, hole diameter and number of bolts of the threaded hole of the assembled component, the sixth section thickness of the threaded hole is calculated using the sixth preset formula.

[0009] In one embodiment, optionally, the mechanical property parameters of the initial equivalent model of each component further include the elastic modulus, and the process of determining the mechanical property parameters further includes: The first equivalent elastic modulus of the initial equivalent model of the main bolt is assigned based on the elastic modulus of the actual material of the main bolt. The second equivalent elastic modulus of the initial equivalent model of the main nut is assigned based on the elastic modulus of the actual material of the main nut. Based on the elastic modulus of the original model material of the assembled component and the number of bolts, the third equivalent elastic modulus of the initial equivalent model of the threaded hole of the assembled component is calculated using the seventh preset formula.

[0010] In one embodiment, optionally, the mechanical property parameters of the initial equivalent model of each component also include Poisson's ratio, and the process of determining the mechanical property parameters further includes: The first equivalent Poisson's ratio of the initial equivalent model of the main bolt is calculated using the eighth preset formula; The second equivalent Poisson's ratio of the initial equivalent model of the main nut is calculated using the ninth preset formula; The third equivalent Poisson's ratio of the initial equivalent model of the threaded hole of the assembled part is assigned based on the Poisson's ratio of the actual material of the threaded hole.

[0011] In one embodiment, optionally, establishing the displacement transfer relationship within the core structure group and between the core structure group and the assembled component specifically includes: Establish the nodal displacement coupling relationship between the main bolt and the threaded hole of the mating part, and the nodal displacement coupling relationship between the main nut and the mating part. The displacement transmission relationship is realized by nodal degree of freedom coupling in finite element software.

[0012] In one embodiment, optionally, establishing the nodal displacement coupling relationship between the main bolt and the threaded hole of the mating component includes: Set lateral displacement coupling for all nodes corresponding to the axis of the main bolt threaded area and the axis of the threaded hole; Axial displacement coupling is set for all nodes corresponding to the two outer boundary lines of the main bolt thread area and the two boundary lines of the threaded hole. Establishing the nodal displacement coupling relationship between the main nut and the mating component includes: All nodes in the area where the main nut is pressed into contact with the mating component are subject to full displacement coupling constraints in all directions with all nodes in the corresponding contact area of ​​the main nut.

[0013] Secondly, embodiments of this application provide an equivalent modeling and analysis device for the main bolts of a nuclear main pump, the device comprising: The first determining module is used to determine the core structure group of the nuclear main pump main bolt equivalent model and the geometric dimensions of each component of the core structure group, wherein the core structure group includes the main bolt, the main nut and the threaded hole of the assembled part; The second determining module is used to determine the geometric parameters and mechanical property parameters of the initial equivalent model of each component based on the geometric dimensions of each component of the core structure group. The construction module is used to construct a two-dimensional finite element equivalent model in finite element software based on the geometric parameters, and to assign the mechanical property parameters corresponding to the two-dimensional finite element equivalent model. The modeling module is used to establish the displacement transmission relationship within the core structure group and between the core structure group and the assembled component, and to complete the assembly and construction of the two-dimensional finite element equivalent model. The analysis module is used to perform finite element simulation analysis on the two-dimensional finite element equivalent model and extract the mechanical response data of the key sections of the main bolt as input data for the safety analysis of the main bolt.

[0014] Thirdly, a computer device is provided, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the steps of the above-mentioned method for equivalent modeling and analysis of the main bolt of the nuclear main pump.

[0015] Fourthly, a computer-readable storage medium is provided, which stores a computer program that, when executed by a processor, implements the steps of the above-mentioned method for equivalent modeling and analysis of the main bolt of the nuclear main pump.

[0016] In the above-described scheme implemented by the equivalent modeling and analysis method, device, equipment, and medium for the main bolt of the nuclear main pump, the core structural group and the geometric dimensions of each component of the core structural group are determined for the equivalent modeling of the main bolt of the nuclear main pump. The core structural group includes the main bolt, the main nut, and the threaded holes of the assembled component. Based on the geometric dimensions of each component of the core structural group, the geometric parameters and mechanical property parameters of the initial equivalent model of each component are determined. In finite element software, a two-dimensional finite element equivalent model is constructed based on the geometric parameters, and the corresponding mechanical property parameters are assigned to the two-dimensional finite element equivalent model. The displacement transfer relationship within the core structural group and between the core structural group and the assembled component is established, completing the assembly and construction of the two-dimensional finite element equivalent model. Finite element simulation analysis is performed on the two-dimensional finite element equivalent model to extract the mechanical response data of the key sections of the main bolt, which serves as the input data for the safety analysis of the main bolt. The above technical solution, by clearly defining the composition of the core structural group and accurately extracting the geometric dimensions of each component, systematically determines the geometric and mechanical property parameters of the initial equivalent model, constructs a two-dimensional finite element equivalent model based on finite element software and establishes accurate displacement transfer relationships, and finally extracts the mechanical response data of the key section of the main bolt through simulation analysis. This effectively avoids the high manpower and computational costs of three-dimensional simulation and solves the problem of result deviation caused by unreasonable model simplification in traditional two-dimensional simulation. It achieves a dual improvement in the efficiency and accuracy of the simulation analysis of the main bolt of the nuclear main pump, providing accurate and reliable technical support for the pressure boundary mechanical safety analysis of the nuclear main pump and the safety assessment of the main bolt, and is suitable for the application requirements of engineering digital prototypes. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 A schematic flowchart of an equivalent modeling and analysis method for the main bolt of a nuclear main pump according to an embodiment of this application is shown.

[0019] Figure 2 A two-dimensional structural schematic diagram of the main bolt and main nut according to an embodiment of this application is shown.

[0020] Figure 3 A schematic diagram showing the cross-sectional dimension designation of the main bolt screw and its equivalent dimension designation according to an embodiment of this application is provided.

[0021] Figure 4 A schematic diagram showing the cross-sectional dimension designation of the main bolt nut and its equivalent dimension designation according to an embodiment of this application is provided.

[0022] Figure 5 An example of an equivalent model of the main bolt according to an embodiment of this application and a schematic diagram of the section for extracting the output force after analysis are shown.

[0023] Figure 6 A schematic diagram of the node coupling relationship at the thread of the main bolt equivalent model according to an embodiment of this application is shown.

[0024] Figure 7 A schematic diagram of the node coupling relationship at the nut of the main bolt equivalent model according to an embodiment of this application is shown.

[0025] Figure 8 A block diagram of an equivalent modeling and analysis apparatus for the main bolt of a nuclear main pump according to an embodiment of this application is shown.

[0026] Figure 9 A block diagram of a computer device according to one embodiment of this application is shown. Detailed Implementation

[0027] To better understand the technical solution of this application, the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0028] It should be understood that the described embodiments are merely some, not all, of the embodiments in this application. All other embodiments obtained by those skilled in the art based on the embodiments in this application without inventive effort are within the scope of protection of this application.

[0029] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. The singular forms “a,” “the,” and “the” used in the embodiments of this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0030] The following detailed description of some embodiments of this application is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0031] Please see Figure 1 , Figure 1 A schematic flowchart of an equivalent modeling and analysis method for the main bolt of a nuclear main pump according to an embodiment of this application is shown.

[0032] like Figure 1 As shown, the equivalent modeling and analysis method for the main bolt of the nuclear main pump includes: Step S101: Determine the core structure group of the nuclear main pump main bolt equivalent model and the geometric dimensions of each component of the core structure group, wherein the core structure group includes the main bolt 11, the main nut 12 and the threaded hole of the assembled part.

[0033] Core structure group: refers to the set of core components in the main bolt connection system of the nuclear main pump that play a key role in mechanical transmission characteristics. It is the core object of equivalent modeling and specifically includes the main bolt, main nut and threaded holes of the assembled parts.

[0034] Main Bolt 11: A critical connecting component at the pressure boundary of the main nuclear pump, used to achieve a tight seal on the connected parts, and to withstand axial tensile force, lateral load, and temperature stress during operation. Its structural diagram is shown below. Figure 2 As shown.

[0035] Main nut 12: A fastening component used in conjunction with the main bolt. It transmits the preload of the main bolt to the mating part through a threaded connection, while simultaneously restricting the axial displacement of the main bolt. A structural diagram is shown below. Figure 2 As shown.

[0036] The threaded hole of the assembly: The threaded structure on the main pump body or related components used to mate with the main bolt is the key interface for force transmission, and its equivalent model is the same as that of the main bolt.

[0037] Geometric dimensions: refer to the key physical dimensional parameters of each component in the core structural group, including the outer diameter of the main bolt (D). B ), inner diameter (D) i ); outer diameter of the main nut (D) H ), actual axial length; hole distribution diameter of the threaded holes in the assembled parts (D) BC ), aperture, etc.

[0038] In this step, the geometric dimensions of each component of the core structural group can be accurately obtained by reviewing design drawings, measuring physical objects, or extracting 3D models.

[0039] Main bolt: Collect the outer diameter of the bolt (D) B ), inner diameter (D) i ), supplement the actual axial length, including the screw outer diameter (D) B ) is the subsequent equivalent width D B The calculation basis for / 4 is that the inner diameter (Di) is directly involved in the calculation of the section thickness formula.

[0040] Main nut: Collect outer diameter (D) H ), actual axial length (T) N ), outer diameter (D) H ) used to calculate (D H -D BThe width segment is 1 / 2, and the actual axial length must match the assembly length of the main bolt.

[0041] The threaded holes of the assembled parts: the diameter of the sampling holes (D) BC ), Hole diameter (to the outer diameter D of the main bolt screw) B (Adaptation), hole distribution diameter (D) BC） It is a key parameter for calculating the equivalent elastic modulus of a threaded hole.

[0042] In addition, the number of main bolts installed (N) must be recorded. The size data collection must follow industry standards, and the error must be controlled within ±0.01mm. For batch parts, the average value of 3 or more samples should be taken to avoid the influence of individual differences.

[0043] This approach clearly defines the core equivalent object, avoids redundant irrelevant components, and aligns with the core objectives of simplifying modeling and reducing costs. Complete acquisition of all required key dimensions provides full input for subsequent formula calculations and geometric modeling, ensuring consistency between the model and the actual structure from the outset. Standardized dimensional acquisition and sample processing procedures adapt to the standardized requirements of engineering digital prototypes.

[0044] Step S102: Based on the geometric dimensions of each component of the core structure group, determine the geometric parameters and mechanical property parameters of the initial equivalent model of each component.

[0045] In one embodiment, optionally, the geometric parameters of the initial equivalent model include width and axial length; Specifically, based on the outer diameter of the main bolt, the first width of the initial equivalent model of the main bolt is determined according to a preset equal distribution rule, and the first axial length of the initial equivalent model of the main bolt is determined according to the actual axial length of the main nut to which the main bolt belongs. The second width of the initial equivalent model of the main nut is determined according to a preset segmentation rule based on the outer diameter of the main nut and the outer diameter of the main bolt. The second axial length of the initial equivalent model of the main nut is determined according to the actual axial length of the main nut. The geometric parameters of the initial equivalent model of the threaded hole of the assembled part are consistent with the geometric parameters of the initial equivalent model of the main bolt.

[0046] In one embodiment, optionally, the mechanical property parameters of the initial equivalent model of each component include the cross-sectional thickness, and the process of determining the mechanical property parameters includes: Based on the outer diameter, inner diameter and number of bolts of the main bolt, the first section thickness and the second section thickness of the main bolt are calculated using the first preset formula and the second preset formula. Based on the outer diameter of the main nut, the outer diameter and inner diameter of the main bolt, and the number of bolts, the third, fourth, and fifth section thicknesses of the main nut are calculated using the third, fourth, and fifth preset formulas. Based on the hole distribution diameter, hole diameter and number of bolts of the threaded hole of the assembled component, the sixth section thickness of the threaded hole is calculated using the sixth preset formula.

[0047] In one embodiment, optionally, the mechanical property parameters of the initial equivalent model of each component further include the elastic modulus, and the process of determining the mechanical property parameters further includes: The first equivalent elastic modulus of the initial equivalent model of the main bolt is assigned based on the elastic modulus of the actual material of the main bolt. The second equivalent elastic modulus of the initial equivalent model of the main nut is assigned based on the elastic modulus of the actual material of the main nut. Based on the elastic modulus of the original model material of the assembled component and the number of bolts, the third equivalent elastic modulus of the initial equivalent model of the threaded hole of the assembled component is calculated using the seventh preset formula.

[0048] In one embodiment, optionally, the mechanical property parameters of the initial equivalent model of each component also include Poisson's ratio, and the process of determining the mechanical property parameters further includes: The first equivalent Poisson's ratio of the initial equivalent model of the main bolt is calculated using the eighth preset formula; The second equivalent Poisson's ratio of the initial equivalent model of the main nut is calculated using the ninth preset formula; The third equivalent Poisson's ratio of the initial equivalent model of the threaded hole of the assembled part is assigned based on the Poisson's ratio of the actual material of the threaded hole.

[0049] Initial equivalent model: A simplified model based on the actual structure of the core structure group, after size and attribute equivalence processing according to preset rules, used for two-dimensional finite element simulation.

[0050] Geometric parameters: including width and axial length, divided according to preset rules, specifically: main bolt width D B / 4. Main nut width divided into D B / 4 and (D H -D B () / 2 Two segments.

[0051] The preset equal distribution rules include the main bolt width division rules, including those based on the bolt outer diameter D. B Divide into 4 equal parts, each with a width of D. B / 4.

[0052] Preset segmentation rules: The main nut width is divided into 6 segments, with the center 4 segments being D. B / 4, with one segment on each side (D) H -D B ) / 2.

[0053] In this step, before simulation analysis, it is necessary to perform geometric dimension analysis on the main bolt, main nut, and threaded holes of the mating parts, and discretize the model. Specifically, based on the cross-section of the main bolt, such as... Figure 3 As shown, the width of the equivalent main bolt model is set to four equal parts, with a width value of D. B / 4, D here B The outer diameter of the main bolt's thread is used, and the axial length of the equivalent model is taken based on the actual axial length of the bolt; based on the cross-section of the main nut, such as... Figure 4 As shown, the width of the equivalent main nut model is set to six parts, with the four parts near the center being equal to the width of the main bolt, and the width value is D. B / 4, the remaining two width values ​​are taken as (D H -D B ) / 2, where D H The outer diameter of the main nut is used, and the axial length of the equivalent model is taken from the actual axial length of the nut. The equivalent method for the size of the threaded hole of the assembled part is the same as that for the main bolt.

[0054] Examples of equivalent two-dimensional models of the main bolt and main nut in simulation software are as follows: Figure 5 As shown, the geometric profile is displayed here, and the equivalent model of the threaded hole of the assembly is compared with... Figure 5 The parts below the "output force - extraction section 3" of the main bolt have the same shape.

[0055] In finite element software, after the contour of the equivalent model is completed, it is necessary to perform equivalent simulation of mechanical behavior based on the geometric model. The required indicators are the cross-sectional thickness, elastic modulus, and Poisson's ratio of the geometric model in different regions.

[0056] The following formula is used to calculate the main bolts. This formula is derived from theoretical calculations and empirical corrections:

[0057]

[0058] in , The thickness attribute representing the model (see location) Figure 3 (as shown) The outer diameter of the main bolt. The inner diameter of the main bolt hole. This represents the number of bolts.

[0059] The equivalent method for Poisson's ratio is shown in the following formula:

[0060] in For the equivalent Poisson's ratio of the bolt model, This represents the true Poisson's ratio of the bolt.

[0061] The elastic modulus is set according to the actual elastic modulus of the main bolt.

[0062] The main nut is calculated using the following formula, which is derived from theoretical calculations and empirical corrections:

[0063]

[0064]

[0065] in , , The thickness attribute representing the model (see location) Figure 4 (as shown) The outer diameter of the main nut. The outer diameter of the main bolt. The inner diameter of the main bolt hole. This represents the number of bolts.

[0066] The equivalent method for Poisson's ratio is shown in the following formula:

[0067] in For the equivalent Poisson's ratio of the bolt model, This represents the true Poisson's ratio of the bolt.

[0068] The elastic modulus is set according to the actual elastic modulus of the main nut.

[0069] The threaded hole of the assembled component is calculated using the following formula, which is derived from theoretical calculations and empirical corrections:

[0070]

[0071] in Equivalent thickness of the bolt hole model (here, the same as that of the main bolt) , (same meaning) The diameter of the holes is the distribution diameter; The diameter of the bolt hole; The number of bolts. Let this be the elastic modulus of the bolt hole model; This is the elastic modulus of the original model material.

[0072] The Poisson's ratio is set according to the actual Poisson's ratio of the threaded hole.

[0073] In this step, standardized geometric parameter partitioning rules address the issue of arbitrary simplification of dimensions in traditional 2D models, ensuring the mechanical compatibility of the model's shape with the actual structure while maintaining the overall model's axisymmetry. Mechanical property parameters are derived based on actual dimensions and material properties, and corrected using engineering experience. This accurately reproduces the mechanical properties of the 3D structure while avoiding the complex computational burden of 3D models. Clearly defining the parameter calculation logic ensures precise matching between geometric and mechanical property parameters, providing a core guarantee for subsequent simulation accuracy and enabling more refined simulation of the actual mechanical properties of the main bolts.

[0074] Step S103: In the finite element software, a two-dimensional finite element equivalent model is constructed based on the geometric parameters, and the mechanical property parameters corresponding to the two-dimensional finite element equivalent model are assigned.

[0075] Specifically, a two-dimensional finite element equivalent model can be constructed using finite element software. Finite element software for constructing two-dimensional finite element equivalent models: Professional software used for numerical simulation analysis (such as ANSYS, Abaqus, etc.) supports two-dimensional / three-dimensional model construction, mechanical property setting, boundary condition application, and simulation calculation.

[0076] Two-dimensional finite element equivalent model: A simplified two-dimensional model constructed in finite element software based on determined geometric parameters. It uses parameters such as cross-sectional thickness and elastic modulus to represent the mechanical properties of a three-dimensional structure, thus significantly reducing computational costs.

[0077] Mechanical property assignment: The calculated mechanical property parameters such as cross-sectional thickness, elastic modulus, and Poisson's ratio are assigned to different components of the model (main bolt, main nut, threaded hole) to ensure that the mechanical properties of each component are consistent with the design.

[0078] In the 2D modeling module of the finite element software, the outlines of the main bolt, main nut, and threaded hole are drawn according to their geometric parameters (width, axial length). The equivalent model of the threaded hole has the same shape as a specific area of ​​the main bolt. Quadrilateral elements are used for meshing. Critical stress areas (such as the threaded connection area) are meshed with a finer mesh, while non-critical areas can have their mesh enlarged appropriately, balancing computational accuracy and efficiency. In the software's material property settings interface, material cards are created for each component, accurately inputting the corresponding section thickness, elastic modulus, and Poisson's ratio parameters. It is ensured that the assigned section thickness matches the model's geometric dimensions, and that the elastic modulus and Poisson's ratio are consistent with the actual material. Three key output force extraction sections are clearly marked in the model, covering the threaded connection area, the middle of the bolt shank, and the stress concentration area near the nut, providing a clear basis for subsequent data extraction. Furthermore, unit unification is required before model construction (mm-Ns unit system is recommended); after meshing, a quality check is necessary to ensure that the mesh distortion rate is less than 5%, avoiding computational errors caused by mesh quality issues.

[0079] In this step, the 2D model construction significantly reduces the number of meshes and computational load, improving computational efficiency by over 60% compared to the 3D model. Simultaneously, the equivalence of mechanical properties ensures computational accuracy, effectively addressing the high cost of 3D simulation. Standardized modeling processes and mesh generation rules reduce model deviations caused by human error, improving the stability and repeatability of the method. Precise assignment of mechanical properties ensures the model accurately reproduces the mechanical response characteristics of each component during simulation, laying a solid foundation for establishing subsequent force transmission relationships. Pre-annotating key extraction sections aligns with the engineering requirements of subsequent data extraction, enhancing the overall workflow's coherence.

[0080] Step S104: Establish the displacement transmission relationship within the core structure group and between the core structure group and the assembled component, and complete the assembly and construction of the two-dimensional finite element equivalent model.

[0081] In one embodiment, optionally, establishing the displacement transfer relationship within the core structure group and between the core structure group and the assembled component specifically includes: Establish the nodal displacement coupling relationship between the main bolt and the threaded hole of the mating part, and the nodal displacement coupling relationship between the main nut and the mating part. The displacement transmission relationship is realized by nodal degree of freedom coupling in finite element software.

[0082] In one embodiment, optionally, establishing the nodal displacement coupling relationship between the main bolt and the threaded hole of the mating component includes: Set lateral displacement coupling for all nodes corresponding to the axis of the main bolt threaded area and the axis of the threaded hole; Axial displacement coupling is set for all nodes corresponding to the two outer boundary lines of the main bolt thread area and the two boundary lines of the threaded hole. Establishing the nodal displacement coupling relationship between the main nut and the mating component includes: All nodes in the area where the main nut is pressed into contact with the mating component are subject to full displacement coupling constraints in all directions with all nodes in the corresponding contact area of ​​the main nut.

[0083] Displacement transmission relationship: The displacement constraint relationship within the core structural group and between it and the assembled components. It is used to simulate the connection characteristics in the actual structure (such as the fixed constraint of threaded connection and the contact constraint of end face extrusion) to ensure that the force transmission between the components is consistent with the actual situation.

[0084] Nodal degree of freedom coupling: a core technology for displacement transfer in finite element software. By constraining the degrees of freedom of nodes of different components (such as lateral displacement Ux and axial displacement Uy), nodes are forced to maintain displacement synchronization, simulating the fixed effect of actual connections.

[0085] Nodal displacement coupling relationship: By constraining the displacement degrees of freedom of the corresponding nodes, the constraint relationship of force transmission between components is realized, including lateral displacement coupling (restricting relative displacement in the horizontal direction), axial displacement coupling (restricting relative displacement in the vertical direction), and full coupling constraint (restricting relative displacement in all directions).

[0086] Lateral displacement coupling (Ux coupling): constrains the displacement of nodes in the horizontal direction (x-axis direction) to ensure that there is no relative sliding between components in the radial direction, simulating the radial fixing effect of a threaded connection.

[0087] Axial displacement coupling (Uy coupling): constrains the displacement of nodes in the vertical direction (y-axis direction), ensuring that there is no relative separation between components in the axial direction, simulating the axial force transmission effect of a threaded connection.

[0088] Fully coupled constraint: Constrains the displacement of nodes in all directions (x and y axes) to ensure complete fixation between components, simulating the tight contact state of the main nut and the end face of the mating part being squeezed.

[0089] In this step, a displacement transfer relationship is established between the bolt model and the assembled component to realize the connection property. To improve engineering accuracy, displacement settings are limited based on experience, with the specific requirements as follows: The main bolt and the threaded hole of the mating component need to establish a displacement coupling relationship, such as... Figure 6As shown, the axis of the main bolt thread area and the axis of the threaded hole are coupled with a Ux (lateral displacement) relationship between all nodes. The two outer boundary lines of the main bolt thread area and the two boundary lines of the threaded hole are coupled with a Uy (axial displacement) relationship between all nodes on the lines.

[0090] The main nut and the driven assembly need to establish a displacement coupling relationship, such as... Figure 7 As shown, based on the actual situation, on the mating part, all nodes in the parts or areas that are squeezed with the main nut are coupled and constrained in all directions of displacement with all nodes on the main nut.

[0091] At this point, the finite element equivalent model of the main bolt is complete. Because the simulation analysis of the main bolt will extend to the calculation of the bolt's own safety, it is generally necessary to define the output parameters and their locations based on the output parameters of this equivalent model. After the simulation analysis is completed, it is necessary to further define the output parameters and their locations based on the output parameters of this equivalent model. Figure 5 The output force is shown in “Output Force - Extraction Section 1 (51)”, “Output Force - Extraction Section 2 (52)”, and “Output Force - Extraction Section 3 (53)”. All nodes on the three horizontal lines output force (the simulation software has corresponding functions). The output force is listed separately, and the total axial force and total transverse force are obtained by linearly adding them for each section. The magnitudes of the total axial force and total transverse force are compared, and the maximum values ​​of the total axial force and total transverse force are finally selected as the output indicators. It should be noted that since the two-dimensional model is for the total value of N bolts, it is necessary to specify when outputting the total force that the value is the total value of N bolts.

[0092] In this step, precise displacement coupling constraints realistically reproduce the force transmission characteristics of threaded connections and end-face extrusion, solving the problem of mechanical response distortion caused by the simplification of connection constraints in traditional two-dimensional models. The nodal degree-of-freedom coupling method is easy to operate and effectively ensures constraint accuracy, balancing engineering efficiency and simulation quality, thus forming a standardized constraint setting process. Clearly defining constraint rules for different connection types enables standardized design of constraint relationships, improving the operability and consistency of the method and providing crucial assurance for model accuracy.

[0093] Step S105: Perform finite element simulation analysis on the two-dimensional finite element equivalent model to extract the mechanical response data of the key section of the main bolt, which is used as input data for the safety analysis of the main bolt.

[0094] Finite element simulation analysis: Using the solver of finite element software, boundary conditions (such as loads and constraints) are applied to the constructed two-dimensional finite element equivalent model, and the mechanical response (such as stress, strain, and force distribution) of the model under simulated working conditions is obtained through numerical calculation.

[0095] Mechanical response data: Key data representing the mechanical state of the model output by simulation analysis, specifically the total axial force and total transverse force of the key section of the main bolt, which directly reflect the stress state of the main bolt.

[0096] Critical sections: The sections on the main bolt that play a decisive role in safety, specifically the three pre-marked horizontal sections, which respectively cover the threaded connection area, the middle of the bolt shank, and the stress concentration area near the nut. These sections are prone to stress concentration and are high-risk areas for fatigue failure.

[0097] Safety analysis of main bolts: Based on the extracted mechanical response data, combined with the material strength, fatigue life and other indicators of the main bolts, the safety margin of the main bolts under actual working conditions is evaluated to determine whether they meet the requirements for long-term operation.

[0098] Apply boundary conditions in the finite element software, including the preload of the main bolt (set according to the design requirements of the nuclear main pump, such as 100-500MPa), the temperature load during operation (such as the operating temperature of the nuclear main pump 200-300℃), and the system pressure load; select static analysis (steady-state condition) or transient analysis (dynamic condition) as the solution type, and set the solution accuracy to medium or above to ensure the reliability of the calculation results.

[0099] After the simulation is completed, the three key sections of the main bolt are located, and the axial force (Uy direction) and transverse force (Ux direction) data of all nodes of each section are extracted. The force data of each section are linearly summed to obtain the total axial force and total transverse force of each section. The maximum values ​​of the total axial force and the total transverse force are selected as the core input data for safety analysis.

[0100] When extracting data, ensure that the units are consistent and that the force data is in N. After extraction, the data should be validated and outliers (such as abrupt changes due to mesh quality) removed. It should be noted that the extracted data is the total value of all bolts to facilitate the allocation calculation in the subsequent single bolt safety assessment.

[0101] In this way, finite element simulation analysis can quickly obtain mechanical response data of key sections of the main bolt, reducing costs by more than 80% compared to physical testing. It can also simulate stress states under extreme working conditions, meeting the needs of efficient engineering analysis. The selection of key sections is highly targeted; the extracted total axial force and total lateral force directly reflect the core stress characteristics of the main bolt, providing accurate and efficient input support for safety analysis. The standardized data extraction process ensures consistency of data output under different simulation scenarios, facilitating subsequent comparative analysis and process optimization, forming a complete closed loop of "modeling-simulation-extraction." The deviation between simulation results and actual working conditions is controlled within 10%, balancing computational efficiency and accuracy, fully meeting the engineering application requirements of pressure boundary mechanical analysis for nuclear main pumps.

[0102] The above technical solution solves the problem of low precision in the equivalent modeling of the main bolts during the two-dimensional simulation analysis of the nuclear main pump. Through a standardized finite element simulation equivalent modeling analysis process and a detailed method for setting equivalent geometric dimensions and mechanical properties, an equivalent modeling method more suitable for engineering applications is obtained. This method can ensure the axisymmetry of the overall model and simulate the actual mechanical properties of the main bolts more accurately.

[0103] like Figure 8 As shown, in a third aspect, embodiments of this application provide an equivalent modeling and analysis device 80 for the main bolts of a nuclear main pump, comprising: The first determining module 81 is used to determine the core structure group of the nuclear main pump main bolt equivalent model and the geometric dimensions of each component of the core structure group, wherein the core structure group includes the main bolt, the main nut and the threaded hole of the assembled part; The second determining module 82 is used to determine the geometric parameters and mechanical property parameters of the initial equivalent model of each component based on the geometric dimensions of each component of the core structure group. The construction module 83 is used to construct a two-dimensional finite element equivalent model in the finite element software based on the geometric parameters, and to assign the mechanical property parameters corresponding to the two-dimensional finite element equivalent model. Modeling module 84 is used to establish the displacement transmission relationship within the core structure group and between the core structure group and the assembled component, and to complete the assembly and construction of the two-dimensional finite element equivalent model. Analysis module 85 is used to perform finite element simulation analysis on the two-dimensional finite element equivalent model and extract the mechanical response data of the key section of the main bolt as input data for the safety analysis of the main bolt.

[0104] In one embodiment, optionally, the geometric parameters of the initial equivalent model include width and axial length; Specifically, based on the outer diameter of the main bolt, the first width of the initial equivalent model of the main bolt is determined according to a preset equal distribution rule, and the first axial length of the initial equivalent model of the main bolt is determined according to the actual axial length of the main nut to which the main bolt belongs. The second width of the initial equivalent model of the main nut is determined according to a preset segmentation rule based on the outer diameter of the main nut and the outer diameter of the main bolt. The second axial length of the initial equivalent model of the main nut is determined according to the actual axial length of the main nut. The geometric parameters of the initial equivalent model of the threaded hole of the assembled part are consistent with the geometric parameters of the initial equivalent model of the main bolt.

[0105] In one embodiment, optionally, the mechanical property parameters of the initial equivalent model of each component include the cross-sectional thickness, and the process of determining the mechanical property parameters includes: Based on the outer diameter, inner diameter and number of bolts of the main bolt, the first section thickness and the second section thickness of the main bolt are calculated using the first preset formula and the second preset formula. Based on the outer diameter of the main nut, the outer diameter and inner diameter of the main bolt, and the number of bolts, the third, fourth, and fifth section thicknesses of the main nut are calculated using the third, fourth, and fifth preset formulas. Based on the hole distribution diameter, hole diameter and number of bolts of the threaded hole of the assembled component, the sixth section thickness of the threaded hole is calculated using the sixth preset formula.

[0106] In one embodiment, optionally, the mechanical property parameters of the initial equivalent model of each component further include the elastic modulus, and the process of determining the mechanical property parameters further includes: The first equivalent elastic modulus of the initial equivalent model of the main bolt is assigned based on the elastic modulus of the actual material of the main bolt. The second equivalent elastic modulus of the initial equivalent model of the main nut is assigned based on the elastic modulus of the actual material of the main nut. Based on the elastic modulus of the original model material of the assembled component and the number of bolts, the third equivalent elastic modulus of the initial equivalent model of the threaded hole of the assembled component is calculated using the seventh preset formula.

[0107] In one embodiment, optionally, the mechanical property parameters of the initial equivalent model of each component also include Poisson's ratio, and the process of determining the mechanical property parameters further includes: The first equivalent Poisson's ratio of the initial equivalent model of the main bolt is calculated using the eighth preset formula; The second equivalent Poisson's ratio of the initial equivalent model of the main nut is calculated using the ninth preset formula; The third equivalent Poisson's ratio of the initial equivalent model of the threaded hole of the assembled part is assigned based on the Poisson's ratio of the actual material of the threaded hole.

[0108] In one embodiment, optionally, the modeling module is specifically used for: Establish the nodal displacement coupling relationship between the main bolt and the threaded hole of the mating part, and the nodal displacement coupling relationship between the main nut and the mating part. The displacement transmission relationship is realized by nodal degree of freedom coupling in finite element software.

[0109] In one embodiment, optionally, establishing the nodal displacement coupling relationship between the main bolt and the threaded hole of the mating component includes: Set lateral displacement coupling for all nodes corresponding to the axis of the main bolt threaded area and the axis of the threaded hole; Axial displacement coupling is set for all nodes corresponding to the two outer boundary lines of the main bolt thread area and the two boundary lines of the threaded hole. Establishing the nodal displacement coupling relationship between the main nut and the mating component includes: All nodes in the area where the main nut is pressed into contact with the mating component are subject to full displacement coupling constraints in all directions with all nodes in the corresponding contact area of ​​the main nut.

[0110] Thirdly, a computer device is provided, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the steps of the above-mentioned method for equivalent modeling and analysis of the main bolt of the nuclear main pump.

[0111] Fourthly, a computer-readable storage medium is provided, which stores a computer program that, when executed by a processor, implements the steps of the above-mentioned method for equivalent modeling and analysis of the main bolt of the nuclear main pump.

[0112] It should be noted that those skilled in the art will understand that, for the sake of convenience and brevity, the specific working process of the nuclear main pump main bolt equivalent modeling and analysis device and each module described above can be referred to the corresponding process in the aforementioned nuclear main pump main bolt equivalent modeling and analysis method embodiment, and will not be repeated here.

[0113] It should be noted that those skilled in the art will understand that, for the sake of convenience and brevity, the specific working process of the model training device and each module described above can be referred to the corresponding process in the aforementioned embodiment of the equivalent modeling and analysis method for the main bolt of the nuclear main pump, and will not be repeated here.

[0114] The aforementioned equivalent modeling and analysis device for the main bolts of the nuclear main pump can be implemented as a computer program, which can be used in applications such as... Figure 9 It runs on the computer device shown.

[0115] Figure 9 A block diagram of a computer device according to one embodiment of this application is shown.

[0116] See Figure 9 The computer device includes a processor, memory, and network interface connected via a system bus, wherein the memory may include storage media and internal memory.

[0117] The storage medium may store an operating system and a computer program. The computer program includes program instructions that, when executed, cause the processor to perform any of the multi-source data equivalent modeling and analysis methods for the main bolts of a nuclear main pump provided in the embodiments of this application.

[0118] The processor provides computing and control capabilities, supporting the operation of the entire computer device.

[0119] The internal memory provides an environment for the execution of computer programs stored in the storage medium. When executed by a processor, this computer program enables the processor to perform any multi-source data equivalent modeling and analysis method for the main bolts of the nuclear main pump. The storage medium can be non-volatile or volatile.

[0120] This network interface is used for network communication, such as sending assigned tasks. Those skilled in the art will understand that... Figure 9 The structure shown is merely a block diagram of a portion of the structure related to the present application and does not constitute a limitation on the computer device to which the present application is applied. Specific computer devices may include more or fewer components than those shown in the figure, or combine certain components, or have different component arrangements.

[0121] It should be understood that the processor can be a Central Processing Unit (CPU), but it can also be other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. Among these, a general-purpose processor can be a microprocessor or any conventional processor.

[0122] In addition, embodiments of this application provide a computer-readable storage medium storing computer-executable instructions for performing the steps of the method in the first aspect embodiment.

[0123] It should be noted that the functions or steps that can be implemented by the computer-readable storage medium or electronic device described above can be referred to the relevant descriptions in the foregoing method embodiments. To avoid repetition, they will not be described one by one here.

[0124] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0125] It should be understood that although the terms "first," "second," etc., may be used to describe the setting units in the embodiments of this application, these setting units should not be limited to these terms. These terms are only used to distinguish the setting units from each other. For example, without departing from the scope of the embodiments of this application, the first setting unit may also be referred to as the second setting unit, and similarly, the second setting unit may also be referred to as the first setting unit.

[0126] Depending on the context, the word "if" as used here can be interpreted as "when," "when," "in response to determination," or "in response to detection." Similarly, depending on the context, the phrase "if determination" or "if detection (of the stated condition or event)" can be interpreted as "when determination," "in response to determination," "when detection (of the stated condition or event)," or "in response to detection (of the stated condition or event)."

[0127] In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between apparatuses or units may be electrical, mechanical, or other forms.

[0128] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or in a combination of hardware and software functional units.

[0129] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium. When executed, the computer program can include the processes of the embodiments of the above methods. Any references to memory, storage, databases, or other media used in the embodiments provided in this application can include non-volatile and / or volatile memory. Non-volatile memory may include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), or flash memory. Volatile memory may include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), dual data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link DRAM (SLDRAM), RAMbus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM), etc.

[0130] The above-described embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included within the protection scope of the present invention.

Claims

1. A method for equivalent modeling and analysis of the main bolt of a nuclear main pump, characterized in that, The method includes: The core structural group and the geometric dimensions of each component of the core structural group are determined by equivalent modeling of the main bolt of the nuclear main pump. The core structural group includes the main bolt, the main nut and the threaded holes of the assembled parts. Based on the geometric dimensions of each component of the core structure group, determine the geometric parameters and mechanical property parameters of the initial equivalent model of each component; In finite element software, a two-dimensional finite element equivalent model is constructed based on the geometric parameters, and the corresponding mechanical property parameters are assigned to the two-dimensional finite element equivalent model. Establish the displacement transmission relationship within the core structure group and between the core structure group and the assembled component, and complete the assembly and construction of the two-dimensional finite element equivalent model; Finite element simulation analysis was performed on the two-dimensional finite element equivalent model to extract the mechanical response data of the key sections of the main bolt, which was used as input data for the safety analysis of the main bolt.

2. The method according to claim 1, characterized in that, The geometric parameters of the initial equivalent model include width and axial length; Specifically, based on the outer diameter of the main bolt, the first width of the initial equivalent model of the main bolt is determined according to a preset equal distribution rule, and the first axial length of the initial equivalent model of the main bolt is determined according to the actual axial length of the main nut to which the main bolt belongs. The second width of the initial equivalent model of the main nut is determined according to a preset segmentation rule based on the outer diameter of the main nut and the outer diameter of the main bolt. The second axial length of the initial equivalent model of the main nut is determined according to the actual axial length of the main nut. The geometric parameters of the initial equivalent model of the threaded hole of the assembled part are consistent with the geometric parameters of the initial equivalent model of the main bolt.

3. The method according to claim 1, characterized in that, The mechanical property parameters of the initial equivalent model of each component include the cross-sectional thickness. The process of determining these mechanical property parameters includes: Based on the outer diameter, inner diameter and number of bolts of the main bolt, the first section thickness and the second section thickness of the main bolt are calculated using the first preset formula and the second preset formula. Based on the outer diameter of the main nut, the outer diameter and inner diameter of the main bolt, and the number of bolts, the third, fourth, and fifth section thicknesses of the main nut are calculated using the third, fourth, and fifth preset formulas. Based on the hole distribution diameter, hole diameter and number of bolts of the threaded hole of the assembled component, the sixth section thickness of the threaded hole is calculated using the sixth preset formula.

4. The method according to claim 1, characterized in that, The mechanical property parameters of the initial equivalent model of each component also include the elastic modulus, and the process of determining the mechanical property parameters further includes: The first equivalent elastic modulus of the initial equivalent model of the main bolt is assigned based on the elastic modulus of the actual material of the main bolt. The second equivalent elastic modulus of the initial equivalent model of the main nut is assigned based on the elastic modulus of the actual material of the main nut. Based on the elastic modulus of the original model material of the assembled component and the number of bolts, the third equivalent elastic modulus of the initial equivalent model of the threaded hole of the assembled component is calculated using the seventh preset formula.

5. The method according to claim 1, characterized in that, The mechanical property parameters of the initial equivalent model of each component also include Poisson's ratio, and the process of determining the mechanical property parameters further includes: The first equivalent Poisson's ratio of the initial equivalent model of the main bolt is calculated using the eighth preset formula; The second equivalent Poisson's ratio of the initial equivalent model of the main nut is calculated using the ninth preset formula; The third equivalent Poisson's ratio of the initial equivalent model of the threaded hole of the assembled part is assigned based on the Poisson's ratio of the actual material of the threaded hole.

6. The method according to claim 1, characterized in that, The establishment of the displacement transmission relationship within the core structure group and between the core structure group and the assembled components specifically includes: Establish the nodal displacement coupling relationship between the main bolt and the threaded hole of the mating part, and the nodal displacement coupling relationship between the main nut and the mating part. The displacement transmission relationship is realized by nodal degree of freedom coupling in finite element software.

7. The method according to claim 1, characterized in that, Establishing the nodal displacement coupling relationship between the main bolt and the threaded hole of the assembled component includes: Set lateral displacement coupling for all nodes corresponding to the axis of the main bolt threaded area and the axis of the threaded hole; Axial displacement coupling is set for all nodes corresponding to the two outer boundary lines of the main bolt thread area and the two boundary lines of the threaded hole. Establishing the nodal displacement coupling relationship between the main nut and the mating component includes: All nodes in the area where the main nut is pressed into contact with the mating component are subject to full displacement coupling constraints in all directions with all nodes in the corresponding contact area of ​​the main nut.

8. A device for equivalent modeling and analysis of the main bolt of a nuclear main pump, characterized in that, The device includes: The first determining module is used to determine the core structure group of the nuclear main pump main bolt equivalent model and the geometric dimensions of each component of the core structure group, wherein the core structure group includes the main bolt, the main nut and the threaded hole of the assembled part; The second determining module is used to determine the geometric parameters and mechanical property parameters of the initial equivalent model of each component based on the geometric dimensions of each component of the core structure group. The construction module is used to construct a two-dimensional finite element equivalent model in finite element software based on the geometric parameters, and to assign the mechanical property parameters corresponding to the two-dimensional finite element equivalent model. The modeling module is used to establish the displacement transmission relationship within the core structure group and between the core structure group and the assembled component, and to complete the assembly and construction of the two-dimensional finite element equivalent model. The analysis module is used to perform finite element simulation analysis on the two-dimensional finite element equivalent model and extract the mechanical response data of the key sections of the main bolt as input data for the safety analysis of the main bolt.

9. A computer device, characterized in that, include: At least one processor; And, a memory communicatively connected to the at least one processor; The memory stores instructions executable by the at least one processor, the instructions being configured to perform the method according to any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that, The device stores computer-executable instructions for performing the method as described in any one of claims 1 to 7.

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