Strength simulation and checking method of vacuum chamber sector hoist of nuclear fusion device

Abstract

The application discloses a kind of vacuum chamber Sector hoist strength simulation and checking method of nuclear fusion device, comprising the following steps: S1.vacuum chamber Sector hoist structure data is obtained and corresponding geometric data model is established, and finite element model is established to the geometric data model simulation, wherein geometric data model is set to include the three-dimensional model of hoist of all key load-bearing components;S2.specified load condition set is defined, and stress analysis and buckling instability analysis operation are carried out on specified component model under specified load condition;S3.safety margin of specified component model is calculated and evaluated to check whether specified structure meets specified strength requirement, wherein the safety margin of specified component model exists following double-threshold joint criterion rule.The application can realize the systematic mechanical evaluation of lug, pull rod, bridge and other key structures, so as to guarantee the structural safety and reliability of hoisting process.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of structural data simulation analysis, in particular to a strength simulation and checking method for a vacuum chamber Sector hoist of a nuclear fusion device, which is suitable for hoist design checking in the process of vacuum chamber installation, ring closing, position adjustment and carrying of compact tokamak and other nuclear fusion experimental devices, and is specifically suitable for strength evaluation and analysis of the lifting lug and main structure under the conditions of bearing multiple working conditions, limit load and space attitude change. BACKGROUND

[0002] With the increasing demand for clean energy worldwide, nuclear fusion energy, as a potential form of high-efficiency and clean energy in the future, is receiving widespread attention. The vacuum chamber (Vacuum Vessel, VV) is a key component of the nuclear fusion device, which undertakes multiple tasks such as providing a high-vacuum reaction environment, supporting internal components, and resisting electromagnetic and thermal loads. The vacuum chamber is large in structure, complex in shape, and high in manufacturing precision. In order to ensure installation precision and structural integrity, the vacuum chamber usually adopts a process route of modular manufacturing and segmented hoisting in the form of "Sector".

[0003] During installation and ring closing, a specially designed hoist is used to transport each Sector module from the pre-installation area to the main hall and complete the spatial attitude adjustment and precise positioning. Such a hoist not only needs to bear the weight of the vacuum chamber, cold screen, supporting device and other attached components, but also needs to adapt to the complex load combination and eccentric moment generated during attitude adjustment during hoisting. If the hoist structure design or strength checking is insufficient during hoisting, it will seriously threaten the safety of the device and even cause equipment damage or personal accidents.

[0004] Currently, there are mature technical systems for the hoisting strength analysis of conventional industrial equipment (such as wind turbines and chemical reactors), which mainly use semi-analytical methods based on simplified mechanical models or finite element method (FEM) for force analysis and evaluation of lifting points, lifting lugs or main structures. For example, the existing strength analysis method for large equipment hoist structure is usually based on the following two technical paths:

[0005] (1) Semi-analytical method based on simplified mechanical model

[0006] This method mainly relies on engineering mechanics theory to simplify the modeling of the hoist structure, uses a rod system, beam system or rigid body mechanics model for static analysis, and combines safety factors for strength evaluation. Although this method is fast in calculation and suitable for early scheme selection, it is difficult to accurately capture local stress concentration, material yield tendency and instability characteristics when facing complex geometry and obvious load coupling of large nuclear fusion component hoists, and there is a significant lack of precision.

[0007] (2) Structure strength checking method based on finite element method (such as applied in wind power and heavy industry)

[0008] In the field of wind turbines, petrochemical equipment, etc., a lifting lug strength analysis method based on finite element modeling combined with load distribution principles is proposed. This kind of scheme usually divides the structure into lifting lug, main beam and other modules for static simulation, applies load and evaluates the stress distribution. Although this method has high reliability and feasibility in general industrial scenarios, its main problem is:

[0009] a. Lack of systematic consideration of multi-condition loading conditions, unable to cover the full life cycle load changes of nuclear fusion devices in handling, turning, installation and other different attitudes;

[0010] b. The asymmetricity of the structure and the flexible coupling relationship between the lifting appliance and the lifted object are not considered in the model simplification process, resulting in deviation of the simulation results from the actual stress state;

[0011] c. The stress evaluation of key parts such as main welds, connecting rods, bridge reinforcements, etc. in the lifting appliance structure is rough, lacking detailed analysis at the unit scale;

[0012] d. Stability analysis and instability mode identification methods are not introduced, which cannot identify the potential buckling failure risk of the structure under pressure or inclined conditions;

[0013] e. The boundary condition processing is single, usually using simplified constraints or concentrated loads, without simulating real distributed forces, force couples or nonlinear lifting belts.

[0014] In summary, the methods mentioned in the prior art often do not have multi-condition analysis, instability discrimination, weld evaluation functions, and are not customized for the complex geometry, spatial stiffness coupling, asymmetric load characteristics of nuclear fusion devices. Especially in the face of extreme conditions (such as eccentric lifting, large inclination angle, etc.), traditional methods are difficult to effectively capture the potential failure mode of the lifting appliance, and the analysis results lack reliability and safety margin evaluation.

[0015] Therefore, the present application proposes a strength simulation and checking method for the vacuum chamber Sector lifting appliance of a nuclear fusion device to solve the above technical problems. SUMMARY

[0016] The main purpose of the present application is to provide a strength simulation and checking method for the vacuum chamber Sector lifting appliance of a nuclear fusion device. By establishing a refined finite element model, combining multi-condition load application, local stress extraction, buckling analysis and safety margin evaluation techniques, systematic mechanical evaluation of key structures such as lifting lugs, rods and bridges is achieved, thereby ensuring the structural safety and reliability of the lifting process, to solve the technical problems raised in the background technology.

[0017] The application solves the above technical problems by adopting the following technical solutions:

[0018] A strength simulation and checking method of a vacuum chamber Sector hoist of a nuclear fusion device, comprising the following steps:

[0019] S1. Obtain structure data of the vacuum chamber Sector hoist and establish a corresponding geometric data model, and establish a finite element model to simulate the geometric data model;

[0020] S2. Define a set of specified load conditions, and perform stress analysis and buckling instability analysis operations on the specified component model under the specified load conditions;

[0021] S3. Calculate the safety margin of the specified component model and evaluate it to check whether the specified structure meets the specified strength requirement.

[0022] Preferably, the geometric data model in the S1 step is set as a hoist three-dimensional model containing all key load-bearing components, and the hoist three-dimensional model includes:

[0023] Mass distribution data of the vacuum chamber Sector and its attached components;

[0024] Hoist structure configuration including balance beams, radial beams, lifting lugs, bridge frames, and pull rods;

[0025] Hoisting conditions, including actual hoisting paths and postures;

[0026] Ear plate thickness, weld position, and connecting rib plate.

[0027] Preferably, the specific operation process of the finite element model simulation of the geometric data model in the S1 step includes:

[0028] For the hoist three-dimensional model frame, use Q355D or 42CrMo steel material parameters as component material properties;

[0029] In the three-dimensional model frame: use Shell181 elements to simulate the shell and rib plate structure, use Link180 elements to simulate the connecting pull rod, use Solid186 or Solid187 to simulate the lifting lug and solid plate, and use Contact elements to define contact nonlinearity for the flexible interface or assembly joint of the connecting part;

[0030] For the stress points under different conditions, corresponding full constraints or symmetric constraints are set respectively, wherein:

[0031] The full constraints are set at the balance beam lifting points, and the load is distributed according to the proportion calculated by the center of gravity by applying a line load at the lug position;

[0032] The symmetry constraints are arranged at both ends of the radial beam to introduce equivalent force couples in the tilting working condition, and the equivalent forces in positive and negative directions are applied through the bridge at both ends.

[0033] Preferably, the specified load working condition set includes:

[0034] Working condition 1: using vacuum chamber hoisting, the balance beam is inclined forward by 6°, and the load composition includes the self weight of Sector and eccentric force couple;

[0035] Working condition 2: using vacuum chamber hoisting, the balance beam is inclined backward by 6°, and the load composition is the same as that in the working condition 1 but in the opposite direction, for simulating reverse force couple;

[0036] Working condition 3: using vacuum chamber hoisting, the balance beam is horizontal, and the load composition only includes the self weight of Sector, and the force couple item is zero;

[0037] Working condition 4: using vacuum chamber and cold shield hoisting, the balance beam is horizontal, and the load composition includes the cold shield, for increasing the vertical load;

[0038] Working condition 5: using whole Sector hoisting, the balance beam is inclined forward by 6°, and the load composition includes the whole Sector, the cold shield, two groups of TF coils and the face support, and there is an inclination to generate force couple;

[0039] Working condition 6: using whole Sector hoisting, the balance beam is inclined backward by 6°, and the load composition is the same as that in the working condition 5 but in the opposite direction;

[0040] Working condition 7: using whole Sector hoisting, the balance beam is horizontal, and the load composition includes the same as that in the working condition 5 but without inclination force couple, and only vertical concentrated load;

[0041] In the working conditions 1-7, the hoisting point constraints are used to simulate the real steel wire rope end connection form, equivalent couple is introduced in the tilting working condition, and is realized by applying a pair of concentrated forces in opposite directions at the end of the bridge.

[0042] Preferably, the load formula in the specified load working condition set includes:

[0043] (1) the calculation formula of equivalent gravity load is:

[0044]

[0045] wherein, is the gravity acceleration, is the mass of each component, indicates the equivalent gravity load;

[0046] (2) the distribution formula of equivalent distributed load is:

[0047]

[0048] in, To adopt When the first suspension point is applied, the first... Force distribution at each suspension point For the first Stiffness of each suspension point For the first Stiffness of each suspension point;

[0049] (3) The formula for equivalent couples is:

[0050]

[0051] in, For attitude tilt angle Or the couple introduced when the center of gravity shifts. The vertical distance from the center of gravity to the balance beam. The angle is the tilt direction, and Indicates along the x-direction, Indicates along the y-direction, This represents the horizontal offset of the center of gravity along the x-direction. The horizontal offset of the center of gravity along the y-direction is shown. and This is used to represent the horizontal offset of the combined centroid of the vacuum chamber and its associated structures relative to the geometric center.

[0052] Preferably, for the specified load case set, the following case identification rules and load application rules are further included to specify the procedural execution of load simulation, specifically including:

[0053] (1) Operating condition identification rules

[0054] (1a) If the attitude tilt angle =0 and =0 and If the value is 0, it is determined to be a horizontal reference working condition;

[0055] (1b) If If the value is not equal to 0, it is determined to be an inclined working condition, generating a stress couple. ;

[0056] (1c) If ≠0 or If the value is not equal to 0, it is determined to be an off-center load condition, and an eccentric couple is generated.

[0057] (2) Load application rules, specifically including:

[0058] (2a) Distributed force rule: Distributed loads are preferred, and the load at the lifting point is determined according to... Automatic allocation;

[0059] (2b) Couple rule, used to generate couples when the tilt angle or eccentricity meets the conditions.

[0060] (2c) Mixed rule: used to apply distributed force simultaneously when there is both tilt and eccentricity. With stress couple .

[0061] Preferably, the stress analysis operation in step S2 includes:

[0062] Extract the VonMises equivalent stress distribution, identify the location of the maximum stress in the model, and determine whether it exceeds the preset material yield strength;

[0063] For the lifting lugs and welds, a local analysis method is adopted to extract the stress cloud diagram around the opening of the lifting lug, and to perform cross-sectional analysis on the welds of the balance beam and lug plate, and the butt welds of the cable tray.

[0064] Extract the displacements of specified key nodes, including the location of the lifting lugs, and check whether the overall structural stiffness meets the preset standards;

[0065] Check for severe torsion, sagging, or other displacement deviations during the lifting process to determine the deformation response.

[0066] Preferably, the buckling instability analysis operation in step S2 includes:

[0067] The triggering conditions for constructing a buckling stability check are:

[0068]

[0069]

[0070]

[0071] This refers to the length of the distance between the lifting points of the lifting device;

[0072] When any of the conditions are met, buckling stability analysis is automatically triggered.

[0073] in, and These are either empirical or standardized thresholds (typically set to a certain value). =5°, =0.05);

[0074] When the stability check trigger condition is met, the buckling instability analysis is automatically executed. Linear buckling modal analysis is used to identify the potential buckling instability risk of the structure under axial compression and tilting loads, and the minimum buckling eigenvalue is output. ;

[0075] Linear buckling mode analysis is used to identify potential buckling instability risks of the structure under axial compression and oblique load, in which linear buckling mode analysis process exists linear expression:

[0076]

[0077] wherein, is the structure stiffness matrix, is the geometric stiffness matrix caused by preload, is the i-th order buckling eigenvalue, which belongs to dimensionless number, is the corresponding buckling deformation mode;

[0078] In which the linear buckling mode analysis judgment basis is: take the minimum buckling eigenvalue If , it means that the structure may buckle under lower load, which has greater risk.

[0079] Preferably, the safety margin calculation in the S3 step includes respectively:

[0080] Stress safety margin calculation, the calculation formula is: ;

[0081] wherein, is the maximum equivalent stress, is the material allowable stress;

[0082] Stability safety margin calculation, the calculation formula is:

[0083] wherein, is the minimum buckling eigenvalue, is the buckling safety requirement;

[0084] If the value of stability safety margin is less than 0, it means that the overall structure has the possibility of instability.

[0085] Preferably, the safety margin of the specified component model in the S3 step exists the following double-threshold joint criterion:

[0086] For stress safety margin MS and stability safety margin MB:

[0087] If there exists ≥0.05 and ≥0.05, it is determined that the structure meets the dual requirements of strength and stability, and the component model is set to the safety zone;

[0088] If there exists <0 and ≥0.05, it is determined that the structure does not meet the safety requirements, and the component model is set to the danger zone;

[0089] If there is ≥0.05 and 0.05> ≥0, or ≥0.05 and 0.05> ≥0, or 0.05> ≥0 and 0.05> ≥0, then the component model is determined to be in a critical state, indicating that the model corresponding to the component of the lifting appliance three-dimensional model needs to be optimized in design.

[0090] Preferably, when the determination result enters the danger zone or the critical zone, optimization and backtracking of the lifting appliance three-dimensional model are performed through the following process, specifically including:

[0091] If the strength margin is insufficient, the ear thickness, the bridge reinforcement, and the weld form are preferentially adjusted;

[0092] If the stability margin is insufficient, the gusset plate, the box thickness, or the cross-sectional configuration is preferentially optimized;

[0093] After all the optimization measures are completed, re-enter the finite element simulation, and according to the finite element simulation result, recalculate the stress safety margin MS and the stability safety margin MB

[0094] Repeat the above operation until the double-margin requirement is met.

[0095] As can be seen from the above technical solution, the present application provides a strength simulation and checking method for a vacuum chamber Sector lifting appliance of a nuclear fusion device. Compared with the prior art, the present application has the following advantages:

[0096] 1. The present application adopts a layered modeling strategy, reasonably selects Shell181, Solid186, Link180 and other units, and truly simulates the stress characteristics of key components such as lifting ears, balance beams, bridges, and pull rods, fully retains structural details (such as holes, welds, gusset plates, etc.), effectively solves the stress estimation deviation problem caused by modeling simplification in the prior art method, realizes high-fidelity finite element modeling from the whole to the local, and thus significantly improves the modeling accuracy.

[0097] 2. The present application can accurately simulate the complex stress state that may occur in actual lifting by establishing a typical load condition set covering normal and limit states, combining balance beam inclination, assembly eccentricity, gravity combination and other factors. Compared with the traditional static load analysis considering only the self-weight, the present application has a wider coverage and more sufficient risk identification, and can significantly improve the completeness and engineering adaptability of structure checking.

[0098] 3. The present application can identify stress concentration problems in high-risk areas such as weld root, lug transition zone, and bridge middle by introducing sub-model extraction and local stress amplification analysis technology. Compared with the traditional method that only focuses on the overall Von Mises stress, the present application can provide precise positioning of dangerous cross-section basis for design improvement, and improve the weld fatigue life and long-term reliability of the structure.

[0099] 4. The present application introduces modal buckling analysis into the sling structure stability check, uses geometric stiffness matrix and eigenvalue solution to calculate buckling mode and stability safety margin, and can quantitatively evaluate the overall or local buckling risk, making up for the short board of lack of stability control mechanism in the prior art, and providing strong support for structure anti-instability design.

[0100] 5. The present application defines two key indicators of stress safety margin and stability margin, compares them with standard requirements and calculation results, and can realize quantitative evaluation of the safety state of the structure, providing unified, transparent and reviewable criteria for engineering acceptance and design adjustment, and facilitating cross-team collaborative decision-making of structure design and analysis personnel.

[0101] 6. The present application unifies strength and stability in one judgment system, can avoid the safety loss problem under single indicator, and realizes hierarchical and operable engineering judgment by defining safe zone, dangerous zone and critical zone. In addition, the present application uses a closed loop process to ensure that the design improvement direction is clear and reviewable, and avoids empirical "trial and error".

[0102] 7. The present application unifies "working condition-load-constraint" mapping through formula family, can reduce the difference of manual data processing, and is convenient for automatic identification of input parameters and application of load through Python / APDL script, improves efficiency, and is different from the way of manual selection of working condition and application of load in the prior art, realizes the closed loop chain of automatic identification of working condition-formulaized load calculation-regularized application-stability triggering, and makes the simulation and checking process reusable and verifiable.

[0103] It should be understood that the content described in this part is not intended to identify the key or important features of the embodiments of the present application, nor to limit the scope of the present application. Other features of the present application will become apparent from the following description. Of course, any product implementing the present application does not necessarily need to achieve all the advantages described above. BRIEF DESCRIPTION OF DRAWINGS

[0104] The drawings accompanying the specification of this application form a part thereof, serve to provide further understanding of the present application, and together with the description of the exemplary embodiments of the present application and their description serve to explain the present application. The drawings in the accompanying drawings are as follows:

[0105] Figure 1The whole schematic diagram of the method process of the present application;

[0106] Figure 2 The schematic diagram of the standard Sector lifting appliance structure of the present application;

[0107] Figure 3 The schematic diagram of the non-standard Sector lifting appliance structure of the present application;

[0108] Figure 4 The schematic diagram of the standard Sector lifting appliance finite element model of the present application;

[0109] Figure 5 The schematic diagram of the non-standard Sector lifting appliance finite element model of the present application;

[0110] Figure 6 The schematic diagram of the standard Sector lifting appliance working condition 5 analysis simulation result of the present application;

[0111] In Figure 2 and Figure 3 : 1, standard Sector lifting appliance balance beam; 2, standard Sector lifting appliance vacuum chamber alignment module; 3, standard Sector lifting appliance radial beam; 4, standard Sector lifting appliance TF magnet inner support; 5, standard Sector lifting appliance TF magnet outer support; 6, non-standard Sector lifting appliance balance beam; 7, non-standard Sector lifting appliance vacuum chamber alignment module; 8, non-standard Sector lifting appliance radial beam. DETAILED DESCRIPTION

[0112] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. The embodiments in the present application and the features in the embodiments can be combined with each other without conflict. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0113] In the embodiments, refer to Figures 1 to 6 .

[0114] In the embodiment 1 of the present application, as shown in Figure 1 , a strength simulation and checking method of a vacuum chamber Sector lifting appliance of a nuclear fusion device is proposed, including the following steps:

[0115] Step 1: Obtain structure data and establish a geometric model

[0116] (1) Data preparation:

[0117] Obtain assembly drawing and quality distribution data of vacuum chamber Sector and its accessories;

[0118] Make clear the structure configuration of lifting device, including balance beam, radial beam, lifting lug, bridge, pull rod, etc.

[0119] Sort out the actual lifting path and posture, and divide the main lifting conditions.

[0120] (2) 3D modeling:

[0121] Use CAD software to establish a 3D model of the lifting device containing all key load-bearing components;

[0122] Keep structural details, including ear plate thickness, weld position, connecting rib plate, etc.

[0123] Step 2: Finite element model establishment

[0124] (1) Software environment: use ANSYS Workbench or Abaqus to establish simulation model.

[0125] (2) Selection of unit type:

[0126] Shell and rib structure: Shell181 (shell element);

[0127] Connecting pull rod: Link180 element (only bears tension, has been used in real simulation);

[0128] Lifting lug and solid plate: Solid186 / 187;

[0129] Flexible interface or assembly joint at connecting parts: can introduce Contact element to define contact nonlinearity.

[0130] (3) Material property definition: commonly used Q355D (or 42CrMo) for main steel, respectively assigned to different components.

[0131] (4) Apply boundary conditions:

[0132] Set full constraint (balance beam lifting point) or symmetric constraint (radial beam ends) for stress points under different conditions;

[0133] Apply line load at the lifting lug position, and distribute the load proportionally according to the center of gravity calculation;

[0134] Introduce equivalent force couple in inclined condition, and apply equivalent force in positive and negative directions through both ends of the bridge.

[0135] Wherein by adopting a layered modeling strategy, reasonably selecting Shell181, Solid186, Link180 and other units, realistically simulating the stress characteristics of key components such as lifting lugs, balance beams, bridge frames, pull rods and the like, and comprehensively retaining structural details (such as openings, welds, rib plates and the like), the stress estimation deviation problem caused by modeling simplification in the prior art method can be effectively solved, high-fidelity finite element modeling from the whole to the local is realized, and thus the modeling accuracy is significantly improved.

[0136] Step 3: Define the load case set

[0137] In order to cover the whole hoisting process, the following typical load cases are constructed:

[0138]

[0139] In all the load cases, the hoisting point constraint simulates the real steel wire rope end connection form, and an equivalent couple is introduced under the inclined load case, which is realized by applying a pair of concentrated forces with opposite directions at the end of the bridge frame.

[0140] Here, by establishing a typical load case set covering normal and limit states, combined with balance beam inclination, assembly eccentricity, gravity combination and other factors, the complex stress state that may occur in actual hoisting can be accurately simulated. Compared with the traditional static load case analysis which only considers the self-weight, the coverage of the method of the present application is wider, the risk identification is more sufficient, and the completeness and engineering adaptability of the structure checking can be significantly improved.

[0141] In the specific implementation process, in order to solve the problems in the prior art that the load case identification relies on manual experience, the load application lacks unified rules, and the simulation results cannot be guaranteed to be stable and reusable, a load case automatic identification and equivalent load formula family establishment method can be further proposed, the core of which is to formulaize the mapping of input parameters such as hoisting posture, gravity center offset, combined hoisting and the like with load distribution, couple calculation and stability triggering conditions, and form standardized execution rules.

[0142] The specific operation process of the load case automatic identification and equivalent load formula family establishment method in the use process of the present application includes:

[0143] STEP1. Input parameter set, wherein the input parameters include:

[0144] Posture angle : balance beam inclination angle (unit: deg);

[0145] Gravity center horizontal offset , : horizontal offset of the combined gravity center of the vacuum chamber and the auxiliary structure relative to the geometric center (unit: m);

[0146] Combined hoisting The total mass of the components being lifted, such as the Sector module, cold shield, TF coil, etc. (unit: t).

[0147] Lifting point parameters Number of lifting points Spacing between hanging points (Unit: m);

[0148] Sling / Helmet Stiffness Parameters : Stiffness weight used when allocating loads.

[0149] STEP2. Based on the input parameter set, the equivalent gravity load, equivalent distributed load distribution formula, and equivalent couple formula are calculated using the equivalent load formula family. Stability check triggering conditions are then constructed to streamline the stress analysis and buckling instability analysis of specified component models under specified load conditions. Specifically:

[0150] (1) The formula for calculating the equivalent gravity load is:

[0151]

[0152] in, It is the acceleration due to gravity. For the quality of each component, Represented as equivalent gravity load;

[0153] (2) The formula for equivalent distributed load distribution is:

[0154]

[0155] in, To adopt When the first suspension point is applied, the first... Force distribution at each suspension point For the first Stiffness of each suspension point For the first Stiffness of each suspension point;

[0156] (3) The formula for equivalent couples is:

[0157]

[0158] in, For attitude tilt angle Or the couple introduced when the center of gravity shifts. The vertical distance from the center of gravity to the balance beam. The angle is the tilt direction, and Indicates along the x-direction, Indicates along the y-direction, This represents the horizontal offset of the center of gravity along the x-direction. The horizontal offset of the center of gravity along the y direction, which is The horizontal offset of the center of gravity along the y direction, which is For the horizontal offset of the center of gravity of the vacuum chamber and the attached structure relative to the geometric center.

[0159] (4) Stability check trigger condition

[0160] When any of the following conditions is met, the buckling stability analysis is automatically triggered:

[0161]

[0162]

[0163]

[0164] Where, The horizontal offset of the center of gravity along the y direction, which is is an empirical or regulatory threshold (generally, =5°, =0.05).

[0165] At this time, the stability check trigger condition is executed by the following rule base:

[0166] (1) Working condition recognition rule

[0167] (1a) If the attitude inclination angle =0 and =0 and =0, it is determined as a horizontal reference working condition;

[0168] (1b) If ≠0, it is determined as an inclined working condition, and the corresponding force couple is generated;

[0169] (1c) If ≠0 or ≠0, it is determined as an eccentric working condition, and the eccentric force couple is generated;

[0170] (2) Load application rule, specifically including:

[0171] (2a) Distributed force rule, preferentially using distributed load, and the hoisting point load is automatically distributed according to ;

[0172] (2b) Force couple rule, used to generate force couple when the inclination angle or eccentricity meets the condition;

[0173] (2c) Mixed rule: used to simultaneously apply distributed force and the corresponding force couple when there is both inclination and eccentricity.

[0174] At this time, the rule base supports the extension of the standard and non-standard lifting appliance working conditions.

[0175] Wherein when the stability checking trigger condition is met, the buckling modal analysis module is automatically called, and the minimum buckling eigenvalue is output .

[0176] In summary, in the process of strength simulation and checking of the Sector lifting appliance of the nuclear fusion device, a method of automatically identifying and establishing a load formula family is further set up, which can map the "working condition-load-constraint" through the formula family in the identification process, reduce human differences, and automatically identify input parameters and apply loads through Python / APDL scripts at this time, thereby improving efficiency. Therefore, this method is different from the existing technology which only manually selects working conditions and applies loads, and realizes the closed loop chain of automatic working condition identification-formula load calculation-regularized application-stability triggering, so that the simulation and checking process can be reused and verified.

[0177] Step 4: Stress analysis and key position extraction

[0178] (1) Overall stress field:

[0179] Extract the Von Mises equivalent stress distribution and identify the maximum stress position;

[0180] Determine whether it exceeds the material yield strength (take the yield strength as the allowable stress standard).

[0181] (2) Local analysis of lifting lugs and welds:

[0182] The stress concentration around the lug opening is significant, and its stress cloud should be extracted;

[0183] Section analysis is performed on the welds of the balance beam and ear plate, and the bridge butt joint;

[0184] If full penetration welding is used, the weld strength is limited by the yield strength of the base material.

[0185] (3) Deformation response:

[0186] Extract the key node displacement (such as the lug position) and check whether the overall stiffness of the structure meets the requirements;

[0187] Check whether serious torsion, sagging and other displacement deviations occur in the lifting state.

[0188] In addition, in the process of specifically performing stress analysis, the local high stress area such as the lug and the bridge connection area can be further refined modeling and calculation through the introduction of the sub-model analysis method, so as to more accurately obtain the stress concentration factor and the real stress level at the dangerous point, and improve the reliability of the weld evaluation and fatigue life analysis.

[0189] Among them, by introducing the sub-model extraction and local stress amplification analysis technology, the stress concentration problem of high-risk areas such as the weld root, the lug transition area and the middle part of the bridge can be identified. Compared with the traditional method of only focusing on the overall Von Mises stress, the method can provide accurate positioning of the dangerous section basis for design improvement, and improve the weld fatigue life and long-term reliability of the structure.

[0190] Step 5: buckling instability analysis

[0191] Linear buckling modal analysis is used to identify the potential buckling instability risk of the structure under axial compression and inclined load, wherein the analysis is calculated by the following expression:

[0192]

[0193] Among them, is the stiffness matrix of the structure, is the geometric stiffness matrix (caused by preload), is the i-th order buckling eigenvalue (dimensionless), is the corresponding buckling deformation mode.

[0194] At this time, there is a judgment basis:

[0195] Take the minimum buckling eigenvalue ;

[0196] If , it means that the structure may buckle under lower load, which has a high risk; according to the specified standard, it is recommended to .

[0197] In addition, in the implementation process, the stability evaluation method can also be combined with the structure topology optimization technology, and the structure shape reconstruction and material distribution optimization can be carried out based on the buckling modal sensitive area, so as to reduce the structure weight without sacrificing the carrying capacity, and realize the lightweight structure goal.

[0198] Step 6: safety margin calculation and evaluation

[0199] (1) Stress safety margin calculation:

[0200]

[0201] Among them, is the maximum equivalent stress (MPa), Material allowable stress, unit: MPa;

[0202] If the result is negative, it means that the structural stress exceeds the allowable range.

[0203] (2) Stability safety margin calculation

[0204]

[0205] Wherein, Minimum buckling eigenvalue (dimensionless), Buckling safety requirement;

[0206] The value of stability safety margin less than 0 indicates that the structure may be unstable.

[0207] At this time, by defining stress safety margin and stability margin as two key indicators, combined with standard requirements and calculation results, the quantitative evaluation of the safety state of the structure can be realized, which provides a unified, transparent and reviewable criterion for engineering acceptance and design adjustment, and facilitates cross-team collaborative decision-making for structural design and analysis personnel.

[0208] At this time, in the specific implementation process, a joint discrimination and threshold decision of strength-stability double margin can be further proposed to solve the problem of lack of unified criterion and closed-loop optimization chain in the prior art, which separately checks static strength or stability, and the specific steps include:

[0209] L1. Define stress safety margin (MS), which has:

[0210]

[0211] Wherein, Material allowable stress (MPa), Maximum equivalent stress obtained by finite element analysis (MPa), at this time if < 0, it means that the strength is insufficient.

[0212] L2. Define stability safety margin (MB), which has:

[0213]

[0214] Wherein, Minimum buckling eigenvalue obtained by simulation calculation, Buckling critical value required by specification or engineering experience (generally 5.0), at this time if < 0, it means that there is a risk of instability.

[0215] L3. Construct a joint decision rule of double-threshold joint criterion standard, which has:

[0216] Safety zone: when ≥0.05 and When ≥0.05, it is determined that the structure meets the dual requirements of strength and stability.

[0217] Dangerous area: when <0 and When ≥0.05, it is determined that the structure does not meet the safety requirements.

[0218] Critical area: when ≥0.05 and 0.05> ≥0, or ≥0.05 and 0.05> ≥0, or 0.05> ≥0 and 0.05> ≥0, it is determined to be a critical state, and optimization design needs to be triggered.

[0219] Through this dual-threshold joint determination, misjudgment caused by traditional reliance on single stress or buckling results can be avoided.

[0220] L4. When the determination result enters the dangerous area or the critical area, a closed-loop optimization and backtracking mechanism is constructed based on the dual-threshold joint criterion standard, which has:

[0221] If the strength margin is insufficient, the lug thickness, bridge reinforcement, and weld form are adjusted first.

[0222] If the stability margin is insufficient, the gusset plate, box thickness, or optimized section configuration is increased first.

[0223] After all optimization measures are completed, re-enter the finite element simulation, and recalculate MS and MB according to the finite element simulation results.

[0224] Repeat the cycle until the dual-margin requirements are met, forming a "determination-optimization-recheck" closed loop.

[0225] In summary, the strength-stability dual-margin joint determination and threshold decision adopted at this time unifies strength and stability in one determination system, can avoid the lack of safety under single index, and through the definition of safety area, dangerous area, and critical area, can realize hierarchical and operable engineering determination. At the same time, through the closed-loop process, it can ensure that the design improvement direction is clear and reviewable, avoiding empirical "trial and error", so it can be extended to the structural evaluation of standard and non-standard lifting devices, and can be realized through parameterized modeling.

[0226] In addition, by introducing modal buckling analysis into the stability check of the lifting device structure, the geometric stiffness matrix and eigenvalue solution method are used to calculate the buckling mode and stability safety margin, which can quantitatively evaluate the overall or local buckling risk, making up for the short board of the lack of stability control mechanism in the existing technology, and providing strong support for structure anti-instability design.

[0227] Step 7: Reasonable discrimination and structure optimization suggestion

[0228] (1) If the maximum stress < yield strength, and the stability margin > 0, that is, the structure meets the strength requirement;

[0229] (2) If the stress concentration at the lug or bridge is obvious, the following should be carried out: local reinforcement; ear plate thickening; improve the connection mode;

[0230] (3) If the stability margin is insufficient, the thickness of the rib plate / box body should be increased or the configuration should be modified to improve the stiffness.

[0231] At this time, the simulation results of multiple working conditions can also be compared and learned with the failure cases in the experience database, an AI assisted judgment mechanism is introduced, rapid and safe evaluation under non-typical loading state or extreme lifting posture is realized, and the prediction ability for unknown working conditions is improved.

[0232] In addition, the application can also model by adding bolt connection, welding residual stress, actual assembly gap and other process characteristics in the finite element model, so that the simulation results are closer to the actual structure state, thereby improving the fault tolerance judgment ability of manufacturing tolerance and construction deviation in the design verification stage.

[0233] In summary, it should also be noted that the application can also integrate Python or APDL automatic modeling and batch processing scripts to realize parameterized definition of model parameters and rapid iteration solution of multiple working conditions, improve the response speed of the lifting tool design scheme, reduce the manual modeling error, and enhance the process automation and engineering reusability.

[0234] Since the simulation process proposed in the application supports standardization packaging and script-based automatic execution, it is suitable for the evaluation of standard and non-standard Sector lifting tool structures, and can also be extended to other special lifting tools in large nuclear fusion devices. And has good adaptability to different configurations, can significantly improve the efficiency and quality control level of lifting structure design and verification.

[0235] Therefore, in another embodiment provided in the present application, with reference to Figure 2 and Figure 3 the application further proposes embodiments 2 and 3 based on embodiment 1, which respectively propose a strength simulation and checking method for a standard Sector lifting tool and a strength simulation and checking method for a non-standard Sector lifting tool, wherein:

[0236] In embodiment 2: the strength simulation and checking method for the standard Sector lifting tool, the present embodiment takes the standard Sector lifting tool in the vacuum chamber of the nuclear fusion device as the object, and uses the finite element method to carry out structure strength simulation and checking under multiple working conditions, which illustrates the application process and effect of the method in practical engineering, and the results are referred to Figure 2 ,Figure 4 and Figure 6 .

[0237] The specific steps include:

[0238] Step 1: Determine the structural configuration and modeling

[0239] (1) The standard Sector spreader is composed of the following main structures:

[0240] Two lifting lugs and a lug plate;

[0241] A horizontal balance beam (H-beam structure);

[0242] Two connecting pull rods;

[0243] Bridge and beam reinforcement structure;

[0244] Part of the welded joint (lug and beam body, bridge rib plate, etc.);

[0245] (2) Modeling uses ANSYS Workbench, and the structural model is composed of solid elements and bar elements. Specifically as follows:

[0246] Lug plate and main beam: Solid186 element;

[0247] Balance beam and bridge: Shell181 element;

[0248] Pull rod: Link180 element, simulating "only pull not press" behavior;

[0249] Material is set to Q355D, elastic modulus 210GPa, Poisson's ratio 0.3.

[0250] Step 2: Define boundary conditions and load application method

[0251] (1) Boundary condition setting:

[0252] The two lifting points at the top of the balance beam are set as full fixed constraints (equivalent to simulating the connection of the lifting hook);

[0253] Sector and spreader are simulated by contact surface or equivalent rigid connection;

[0254] The Sector structure is applied with its own weight and equivalent load of the attached components.

[0255] (2) Load definition:

[0256] Sector weight, cold shield, TF, support structure, etc. are uniformly applied as equivalent vertical gravity load;

[0257] Equivalent couple is introduced in the inclined working condition, and a pair of equivalent opposite forces are applied at both ends of the bridge to simulate the additional load formed when the balance beam is inclined;

[0258] Each load is applied to the corresponding structural surface according to the proportion of measured data in the analysis report, avoiding numerical instability caused by concentrated loads.

[0259] Step 3: Define typical working conditions: Select the following three key working conditions for structural response simulation:

[0260]

[0261] Step 4: Finite element solution and key results

[0262] (1) Stress response analysis:

[0263] The maximum Von Mises stress occurs at the lower edge of the ear opening, and other high stress points are distributed at the bridge connection;

[0264] The maximum stress under all working conditions does not exceed the yield strength of Q355D, which is 355MPa;

[0265] The stress level in the weld area is high but not exceeding the limit, meeting the structural requirements.

[0266] (2) Displacement evaluation:

[0267] The maximum vertical deformation is about 13mm, occurring below the Sector connection point;

[0268] The deformation difference on both sides of the ear is <5mm, indicating that the structural stiffness meets the symmetry requirements of lifting.

[0269] (3) Buckling analysis:

[0270] The minimum buckling eigenvalue = 6.81 (appears in working condition 5);

[0271] The modal deformation is bridge torsion + local fluctuation of main beam;

[0272] The buckling margin is >0, and no buckling instability risk is found in the structure.

[0273] Step 5: Safety margin evaluation

[0274] For example, as shown in Figure 6 , the summary is as follows:

[0275]

[0276] At this time, although the simulation results meet the structural safety requirements, in order to improve the stability margin under extreme working conditions, it is recommended to: increase the size of the ear root rib plate; introduce a reinforcing plate in the middle of the bridge; optimize the round corner transition of the weld transition area to reduce stress concentration.

[0277] In the strength simulation and checking method of the non-standard Sector lifting appliance in embodiment 3, the customized lifting appliance structure used by the non-standard Sector module in the vacuum chamber of the nuclear fusion device is taken as the object, the finite element simulation and strength checking method of the structure under the special size and stress working condition are introduced, and the wide applicability and engineering reusability of the method are further verified, and the results are referred Figure 3 and Figure 5 .

[0278] The specific steps include:

[0279] Step 1: Determine the structure configuration and design features

[0280] Compared with the standard Sector lifting appliance, the non-standard Sector lifting appliance has the following features:

[0281] The size and weight of the vacuum chamber Sector module are different;

[0282] There is no TF coil load, only Sector and support structure are lifted;

[0283] The bridge is asymmetrically arranged;

[0284] The balance beam is a welded composite beam, and the local reinforcement is unique;

[0285] The lug structure adopts a slotted reinforced lug plate, and the welding method is butt joint + fillet weld composite.

[0286] The overall lifting appliance structure is still composed of lugs, balance beams, connecting rods and bridges.

[0287] Step 2: Build a finite element model

[0288] (1) Model construction

[0289] The model construction platform is ANSYS Workbench;

[0290] The lug, lug plate, beam body and other components use Solid186 elements;

[0291] The connecting rod uses Link180 elements to simulate one-way tension;

[0292] The material is still Q355D, the elastic modulus is 210GPa, and the Poisson's ratio is 0.3.

[0293] (2) Contact and connection definition

[0294] The lug and Sector connection uses rigid area simulation to avoid numerical divergence;

[0295] The balance beam and the bridge are connected by multi-point constraint (MPC) to simulate the weld connection;

[0296] Soft spring constraint is set to prevent rigid body drift problem in solving.

[0297] Step 3: Perform working condition setting and load description

[0298] Three typical working conditions are selected for analysis in this embodiment.

[0299]

[0300] All loads are applied according to self-weight multiplied by safety factor 2.0; eccentric force couple is applied through equivalent counter loads at both ends of the bridge.

[0301] Step 4: Perform result analysis and evaluation operation

[0302] (1) Stress analysis result

[0303] The maximum equivalent stress appears near the reinforced structure in the middle of the bridge and the weld of the lug plate;

[0304] The maximum stress under all working conditions is about 280 MPa, which is lower than the material yield strength;

[0305] The average stress in the weld area is < 250 MPa, and no obvious overrun is found.

[0306] (2) Displacement analysis result

[0307] The maximum vertical displacement is approximately 11 mm;

[0308] The displacement difference between the left and right sides of the lug is about 4 mm, which meets the construction tolerance control range.

[0309] (3) Buckling analysis

[0310] The minimum buckling eigenvalue is 7.02, which appears in working condition 1;

[0311] The buckling mode is a combination of the outward turning of the lug plate and the distortion of the bridge;

[0312] The margin meets the requirements and there is no instability trend.

[0313] Step 5: Evaluate safety margin

[0314] Taking working condition 1 as an example, the summary is as follows:

[0315]

[0316] At this time, although the simulation result meets the structural safety requirements, in order to improve the stability margin under the extreme working condition, it is recommended to add vertical reinforcing bars at the stress concentration position of the bridge; apply a transition fillet to the connection between the lug plate and the balance beam to avoid sharp corner excitation; and suggest using full penetration welding for some fillet welds to improve fatigue life.

[0317] In still another embodiment provided in the present application, a computer program product containing instructions is also provided, which, when running on a computer, causes the computer to execute the strength simulation and checking method of the vacuum chamber Sector lifting appliance of the nuclear fusion device in any of the above embodiments.

[0318] It can be understood that the system provided in the embodiments of the present application corresponds to the method provided in the embodiments of the present application, and the related content explanation, examples and benefits can refer to the corresponding part in the above method.

[0319] The embodiments of the present application also provide an electronic device, including a processor, a communication interface, a memory and a communication bus, wherein the processor, the communication interface and the memory complete mutual communication through the communication bus,

[0320] The memory is used to store a computer program.

[0321] The processor is used to execute the program stored on the memory, and realize the strength simulation and checking method of the vacuum chamber Sector lifting appliance of the nuclear fusion device.

[0322] The communication bus mentioned in the above electronic device can be a peripheral component interconnect bus or an extended industry standard architecture bus. The communication bus can be divided into an address bus, a data bus, a control bus and the like.

[0323] The communication interface is used for communication between the above electronic device and other devices.

[0324] The memory can include a random access memory and can also include a non-volatile memory, for example, at least one disk memory. Optionally, the memory can also be at least one storage device located away from the aforementioned processor.

[0325] The processor mentioned above can be a general-purpose processor, including a central processing unit, a network processor and the like; can also be a digital signal processor, an application specific integrated circuit, a field programmable gate array or other programmable logic device, a discrete gate or transistor logic device, a discrete hardware component.

[0326] In the above embodiments, all or part of them can be realized by software, hardware, firmware or any combination thereof. When realized by software, all or part of them can be realized in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, all or part of the processes or functions described in the embodiments of the present application are generated.

[0327] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

[0328] In addition, it should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement, etc. between the components in a certain posture, and if the certain posture changes, the directional indications will also change accordingly.

[0329] In addition, if the embodiments of the present application involve descriptions such as "first", "second", etc., the descriptions of "first", "second", etc. are only for description purposes and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing throughout the text includes three parallel schemes. Taking "A and / or B" as an example, it includes A scheme, or B scheme, or A and B scheme. In addition, in the embodiments of the present application, "a plurality of" means two or more. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of the ordinary skilled in the art, when the combination of technical solutions appears contradictory or cannot be realized, it should be considered that the combination of technical solutions does not exist, nor is it within the scope of protection required by the present application.

Claims

1. A method for strength simulation and checking of a vacuum chamber Sector hoist of a nuclear fusion device, characterized in that, The method comprises the following steps: S1. Obtain the structural data of the vacuum chamber Sector lifting tool and establish a corresponding geometric data model, and establish a finite element model to simulate the geometric data model; S2. Define a set of specified load conditions, and perform stress analysis and buckling instability analysis on the specified component model under the specified load conditions; S3. Calculate the safety margin of the specified component model and evaluate it to determine whether the specified structure meets the specified strength requirements; The stress analysis operation in step S2 includes: Extract the Von Mises equivalent stress distribution, identify the maximum stress position in the model, and determine whether it exceeds the preset material yield strength; For the lifting lug and the weld, adopt a local analysis method, extract the stress nephogram around the lifting lug opening, and perform section analysis on the welds of the balance beam and the lug plate and the bridge butt joint Extract the displacement of the specified key nodes including the lifting lug position, and check whether the overall stiffness of the structure meets the preset standard; Check whether serious torsion, sagging and other displacement deviations occur under lifting state for deformation response judgment. The buckling instability analysis operation in step S2 includes: The trigger conditions for triggering the execution of buckling stability check are: ； ； ； a length of a distance between hoisting points of a hoist, a horizontal offset of a center of gravity in the x direction, a horizontal offset of a center of gravity in the y direction; When any condition is met, the buckling stability analysis is automatically triggered and executed; wherein with are respectively an empirical or normative threshold value; When the stability checking trigger condition is met, the buckling instability analysis operation is automatically performed, the linear buckling modal analysis is adopted, the potential buckling instability risk of the structure under the axial compression and inclination load is identified, and the minimum buckling characteristic value is output ; Linear buckling modal analysis is used to identify potential buckling instability risks of the structure under axial compression and inclined load, wherein there is a linear expression in the linear buckling modal analysis process: ； wherein, is the structural stiffness matrix, is the geometric stiffness matrix due to pre-loads, is the i-th buckling eigenvalue, belonging to dimensionless numbers, is the corresponding buckling deformation mode; The judgment basis of linear buckling mode analysis is that the minimum buckling eigenvalue is taken If , it is indicated that the structure may buckle under lower load and there is a greater risk.

2. The method of strength simulation and check of the vacuum chamber Sector hanger of the nuclear fusion device according to claim 1, characterized in that, The geometric data model in step S1 is set as a three-dimensional model of the lifting tool containing all key load-bearing components, and the specific operation process of the finite element model simulation on the geometric data model includes: For the lifting tool three-dimensional model frame, use Q355D or 42CrMo steel material parameters as the component material properties; In the three-dimensional model frame: use Shell181 element to simulate the shell and rib structure, use Link180 element to simulate the connecting rod, use Solid186 or Solid187 to simulate the lifting lug and solid plate, and use Contact element to define the contact nonlinearity of the flexible interface or assembly joint at the connection position; For the stress points under different working conditions, corresponding full constraints or symmetric constraints are set, wherein: The full constraints are set at the balance beam lifting point, and the linear load is applied at the lifting lug position, and the load proportion is distributed according to the gravity center; The symmetric constraints are set at the ends of the radial beam, which are used to introduce equivalent force couples in inclined conditions, and the equivalent forces in positive and negative directions are applied through the two end bridges.

3. The method of strength simulation and check of the vacuum chamber Sector hoist of the nuclear fusion device according to claim 2, characterized in that, The set of specified load conditions includes: Working condition 1: vacuum chamber lifting, balance beam forward inclination 6°, load composition including Sector self-weight and eccentric couple; Working condition 2: vacuum chamber lifting, balance beam backward inclination 6°, load composition same as working condition 1 but in opposite direction, used to simulate reverse couple; Working condition 3: vacuum chamber lifting, balance beam horizontal, load composition only including Sector self-weight, couple item is zero; Working condition 4: vacuum chamber and cold screen lifting, balance beam horizontal, load composition including cold screen, used to increase vertical load; Condition 5: The whole Sector is hoisted, the balance beam is inclined forward by 6°, the load composition includes the whole Sector, the cold shield, two groups of TF coils and the face support, and a couple of forces is generated by the inclination; Condition 6: The whole Sector is hoisted, the balance beam is inclined backward by 6°, the load composition is the same as that in the condition 5, and the direction is opposite; Condition 7: The whole Sector is hoisted, the balance beam is horizontal, the load composition is the same as that in the condition 5, and there is no couple of forces, only vertical concentrated load; In the conditions 1-7, the hoisting point constraint is used to simulate the real end connection form of the steel wire rope, and an equivalent couple of forces is introduced in the inclined condition, and the end of the bridge is realized by applying a pair of concentrated forces in opposite directions.

4. The method of strength simulation and check of the vacuum chamber Sector hoist of the nuclear fusion device according to claim 3, characterized in that, The load formula in the specified load condition set includes: (1) The calculation formula of the equivalent gravity load is: ； wherein, g is the acceleration of gravity, m is the mass of each component, is expressed as an equivalent gravitational load; (2) The distribution formula of the equivalent distributed load is: ； wherein, is the stiffness of the first hanging point, is the distributed force applied to the first hanging point, is the stiffness of the first hanging point, is the stiffness of the first (3) The equivalent couple of forces formula is: ； wherein is the tilt angle of the attitude or the force couple introduced by the shift of the center of gravity, is the vertical distance of the center of gravity to the balance beam, is the angle of the tilt direction, and denotes the horizontal shift of the center of gravity in the x-direction, denotes the horizontal shift of the center of gravity in the y-direction, denotes the horizontal shift of the center of gravity in the x-direction, denotes the horizontal shift of the center of gravity in the y-direction, the with is used to denote the horizontal shift of the combined center of gravity of the vacuum chamber and the attached structures with respect to the geometrical center.

5. The method of strength simulation and check of the vacuum chamber Sector hanger of the nuclear fusion device according to claim 4, characterized in that, For the specified load condition set, the following condition identification rules and load application rules are also included, which are used for the flow execution of the specified load simulation, and specifically include: (1) Condition identification rule: (1a) If the posture tilt angle = 0 and = 0 and = 0, it is determined as the horizontal reference working condition; (1b) if ≠ 0, then it is determined that the working condition is inclined, and a corresponding stress couple is generated; (1c) if ≠ 0 or ≠ 0, then it is determined that the working condition is eccentric loading, and an eccentric force couple is generated. (2) Load application rule, specifically including: (2a) Distribution force rule, prefer to use distributed load, the load point load according to Automatic allocation; (2b) a rule of couple for generating a couple when the angle of inclination or the eccentricity satisfies a condition ; (2c) Mixing rule: for simultaneous application of distributed forces when both tilt and eccentricity are present with corresponding stress couples .

6. The method of strength simulation and check of the vacuum chamber Sector hoist of the nuclear fusion device according to claim 2, characterized in that, The safety margin calculation in the S3 step includes: The stress safety margin calculation, the calculation formula is: ; wherein, is the maximum equivalent stress, is the material allowable stress; Stability safety margin calculation, the calculation formula is: wherein, is the minimum buckling eigenvalue, is the buckling safety requirement; If the value of the stability safety margin is less than 0, it indicates that the whole structure has the possibility of instability.

7. The method of strength simulation and check of the vacuum chamber Sector hoist of the nuclear fusion device according to claim 6, characterized in that, The safety margin of the specified component model in the S3 step has the following double-threshold joint criterion: For the stress safety margin MS and the stability safety margin MB: If there is ≥ 0.05 and ≥ 0.05, it is determined that the structure meets the dual requirements of strength and stability, and the component model is set as a safety zone. If there is <0 and ≥ 0.05, it is determined that the structure does not meet the safety requirements, and the component model is set as a dangerous area. If there is ≥ 0.05 and 0.05 > ≥ 0, or ≥ 0.05 and 0.05 > ≥ 0, or 0.05 > ≥ 0 and 0.05 > ≥ 0, then the component model is determined to be in a critical state, indicating that the model corresponds to a component of the spreader three-dimensional model that needs to be optimized in design.

8. The method of strength simulation and check of the vacuum chamber Sector hoist of the nuclear fusion device according to claim 7, characterized in that, When the determination result enters the danger zone or the critical zone, the optimization and backtracking of the hoist three-dimensional model are performed through the following process, specifically including: If the strength margin is insufficient, the lug thickness, the bridge reinforcement, and the weld form are adjusted in priority; If the stability margin is insufficient, the gusset plate, the box thickness or the optimized cross-sectional configuration are increased in priority; After all the optimization measures are completed, the finite element simulation is re-entered, and the stress safety margin MS and the stability safety margin MB are recalculated according to the finite element simulation results Repeat the cycle until the double-margin requirements are met.

Images