Structural optimization method of mechanical structural component and related assembly

Abstract

The invention discloses a structure optimization method for a mechanical structure component and a related assembly, and the method comprises the steps: applying corresponding load and constraint to a target position of an overall model according to a preset working condition, so as to obtain strength analysis data, and determining a target key structure and / or a target key welding seam in a target mechanical structure component; and establishing a structure sub-model of the target key structure and / or a welding seam sub-model of the target key welding seam, and performing optimization processing on the structure sub-model and / or the welding seam sub-model based on the corresponding target optimization conditions so as to realize structure optimization of the target mechanical structure component. Compared with the direct optimization of the whole model, the target key structure and / or the target key welding seam are / is independently modeled, the complexity of modeling and optimization on the details of the whole model is reduced, and on the premise of meeting the requirements for the stress size and the fatigue strength, the reliability of the whole model is improved. The target key structure and / or the target key welding seam in the target mechanical structure component are / is optimized more accurately.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of rail transit, in particular to a structure optimization method of a mechanical structure component and related assemblies. BACKGROUND

[0002] In the prior art, the structure optimization of a mechanical structure component is usually performed by means of overall modeling and optimization. Since the mechanical structure component is generally large in size and complex in structure, the overall modeling needs to incorporate a large amount of structural information, resulting in high redundancy of the model, complicated modeling process and time-consuming, and too many constraints to be handled, which not only greatly increases the consumption of computing resources, but also makes it difficult to achieve targeted analysis and optimization of the core parts due to the key details being covered by the overall structural information. On the other hand, if the fine features of the microstructure such as welds are forced to be incorporated in the overall model to ensure the accuracy of the details, the size of the model will be dramatically expanded, and the modeling and calculation costs will be significantly increased. In addition, in the overall optimization process, since various performance indicators of the whole structure need to be considered, the constraints are scattered and strict, and only conservative optimization results can be obtained, which makes it difficult to achieve precise optimization for the core failure risk points, and neither the potential of materials and structures can be fully tapped nor the adaptability of the optimization results to the actual service conditions of the component can be ensured, ultimately resulting in unsatisfactory optimization efficiency and engineering practicability. SUMMARY

[0003] The purpose of the present application is to provide a structure optimization method of a mechanical structure component and related assemblies. Compared with directly optimizing the overall model, the target key structure and / or target key weld are modeled separately, which reduces the complexity of modeling and optimization of the details of the overall model, and under the premise of meeting the requirements for stress size and fatigue strength, the target key structure and / or target key weld in the target mechanical structure component are more accurately optimized.

[0004] To solve the above technical problems, the present application provides a structure optimization method of a mechanical structure component, comprising:

[0005] establishing an overall model of a target mechanical structure component, and applying corresponding loads and constraints to target positions of the overall model corresponding to a preset working condition according to the preset working condition to obtain strength analysis data;

[0006] determining a target key structure and / or target key weld in the target mechanical structure component based on the strength analysis data, and establishing a structure sub-model of the target key structure and / or a weld sub-model of the target key weld;

[0007] perform weight optimization processing on the structure sub-model based on a first target optimization condition, the first target optimization condition including that a maximum structure stress value of the structure sub-model under the preset working condition is not higher than a preset maximum structure stress value;

[0008] perform geometry feature optimization processing on the weld sub-model based on a second target optimization condition, the second target optimization condition including that a fatigue life of the weld sub-model under the preset working condition is maximized;

[0009] determine the overall model after structure optimization based on the structure sub-model after weight optimization processing and the weld sub-model after geometry feature optimization processing, and further determine the target mechanical structure component after structure optimization.

[0010] Preferably, corresponding loads and constraints are applied to target positions of the overall model corresponding to the preset working conditions according to the preset working conditions to obtain strength analysis data, including:

[0011] Corresponding loads and constraints are applied to target positions of the target mechanical structure component corresponding to each of the preset working conditions respectively according to different preset working conditions to obtain strength analysis data under different preset working conditions;

[0012] determine target key structures and / or target key welds in the target mechanical structure component based on the strength analysis data, including:

[0013] determine target key structures corresponding to different preset working conditions and / or target key welds corresponding to different preset working conditions based on stress data and deformation data in the strength analysis data under different preset working conditions.

[0014] Preferably, determining target key structures corresponding to different preset working conditions and / or target key welds corresponding to different preset working conditions based on stress data and deformation data in the strength analysis data under different preset working conditions includes:

[0015] determine stress concentration areas in the overall model based on stress data and deformation data in the strength analysis data under different preset working conditions;

[0016] determine structures in the overall model located in the stress concentration areas under different preset working conditions as the target key structures corresponding to different preset working conditions respectively;

[0017] and / or, determine welds in the overall model located in the stress concentration areas under different preset working conditions as the target key welds corresponding to different preset working conditions.

[0018] Preferably, the weight optimization processing on the structure sub-model based on the first target optimization condition comprises:

[0019] The thickness reduction optimization processing is performed on the structure sub-model to reduce the weight of the structure sub-model.

[0020] The minimum weight of the structure sub-model under the first target optimization condition is determined, and the structure sub-model corresponding to the minimum weight is determined as the structure sub-model after the weight optimization processing.

[0021] Preferably, the minimum weight of the structure sub-model under the first target optimization condition is determined, and the structure sub-model corresponding to the minimum weight is determined as the structure sub-model after the weight optimization processing, comprising:

[0022] Based on the preset deformation data of each position point of the structure sub-model when the corresponding load and constraint are applied to the target position of the overall model corresponding to the preset working condition, the target deformation data of each position point of the structure sub-model in the weight optimization processing process is controlled to be the corresponding preset deformation data in turn, so as to obtain the structure strength analysis data of the structure sub-model in the weight optimization processing process.

[0023] Based on the stress data in the structure strength analysis data, the structure stress concentration area of the structure sub-model is determined, and the maximum structure stress of the structure stress concentration area is determined.

[0024] The minimum weight of the structure sub-model when the maximum structure stress is not higher than the preset maximum structure stress value is determined, and the structure sub-model corresponding to the minimum weight is determined as the structure sub-model after the weight optimization processing.

[0025] Preferably, after the minimum weight of the structure sub-model when the maximum structure stress is not higher than the preset maximum structure stress value is determined, and the structure sub-model corresponding to the minimum weight is determined as the structure sub-model after the weight optimization processing, the method further comprises:

[0026] A target structure weld is determined from the structure stress concentration area of the structure sub-model after the weight optimization processing, and the maximum structure weld stress value of the target structure weld is determined based on the structure strength analysis data.

[0027] Based on the maximum structure weld stress value, the lowest fatigue life prediction value of the target structure weld is determined from the stress-life curve.

[0028] If the lowest fatigue life prediction value is not lower than the first preset fatigue life prediction value, it is determined that the optimization of the structure sub-model is completed.

[0029] Preferably, establishing a weld sub-model of the target critical weld includes:

[0030] Several different geometric feature data are determined, including a preset weld leg size and a preset weld thickness, wherein the preset weld leg size is within a preset weld leg size range and the preset weld thickness is within a preset weld thickness range;

[0031] Several weld sub-models of the target critical weld are established based on each of the aforementioned geometric feature data;

[0032] Based on the second objective optimization condition, the geometric feature optimization process of the weld sub-model is performed, including:

[0033] The target geometric feature data of the weld sub-model are determined under the condition of satisfying the second objective optimization, so as to realize the geometric feature optimization processing of the weld sub-model.

[0034] Preferably, determining the target geometric feature data of the weld sub-model under the condition of satisfying the second objective optimization includes:

[0035] Based on the preset deformation data of each position point of the weld sub-model when applying corresponding loads and constraints to the target position corresponding to the preset working condition on the overall model, the target deformation data of each position point of each weld sub-model is controlled to be the corresponding preset deformation data in turn, so as to obtain the weld strength analysis data of each weld model.

[0036] The maximum weld stress of each weld sub-model is determined based on the weld strength analysis data of each weld sub-model.

[0037] Based on the maximum weld stress of each weld sub-model, the minimum predicted weld fatigue life value corresponding to each weld sub-model is determined from the stress-life curve.

[0038] The maximum value among the lowest predicted fatigue life values ​​corresponding to each of the weld sub-models is determined as the maximum fatigue life.

[0039] The geometric feature data of the weld sub-model corresponding to the maximum fatigue life is determined as the target geometric feature data.

[0040] Preferably, it further includes:

[0041] An optimized overall model of the target mechanical structure component is established based on the structural sub-model after weight optimization and / or the weld sub-model after geometric feature optimization, so as to determine the optimization result of the target mechanical structure component.

[0042] To solve the above-mentioned technical problems, the present invention provides a structural optimization system for mechanical structural components, comprising:

[0043] The model building unit is used to build an overall model of the target mechanical structure component, and apply corresponding loads and constraints to the target position on the overall model corresponding to the preset working conditions according to the preset working conditions in order to obtain strength analysis data;

[0044] The first determining unit is used to determine the target critical structure and / or target critical weld in the target mechanical structure component based on the strength analysis data, and to establish a structural sub-model of the target critical structure and / or establish a weld sub-model of the target critical weld;

[0045] The first optimization unit is used to perform weight optimization processing on the structural sub-model based on the first target optimization condition, wherein the first target optimization condition includes that the maximum structural stress value of the structural sub-model under the preset working condition is not higher than the preset maximum structural stress value.

[0046] The second optimization unit is used to perform geometric feature optimization processing on the weld sub-model based on the second objective optimization condition, the second objective optimization condition including maximizing the fatigue life of the weld model under the preset working condition;

[0047] The second determining unit is used to determine the overall model after structural optimization based on the structural sub-model after weight optimization and the weld sub-model after geometric feature optimization, and then determine the target mechanical structure component after structural optimization.

[0048] To solve the above-mentioned technical problems, the present invention provides a structural optimization device for mechanical structural components, comprising:

[0049] Memory, used to store computer programs;

[0050] A processor is used to implement the steps of the structural optimization method for mechanical structural components as described above when executing a computer program.

[0051] This application provides a structural optimization method and related components for mechanical structural components. First, corresponding loads and constraints are applied to the target location of the overall model according to preset working conditions to obtain strength analysis data. Then, the target critical structure and / or target critical weld in the target mechanical structural component are identified. A structural sub-model of the target critical structure and / or a weld sub-model of the target critical weld are established. The structural sub-model and / or weld sub-model are then optimized based on corresponding target optimization conditions to achieve structural optimization of the target mechanical structural component. Compared to directly optimizing the overall model, modeling the target critical structure and / or target critical weld separately reduces the complexity of modeling and optimizing the details of the overall model. Furthermore, while meeting the requirements for stress magnitude and fatigue strength, it achieves more precise optimization of the target critical structure and / or target critical weld in the target mechanical structural component. Attached Figure Description

[0052] To more clearly illustrate the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0053] Figure 1 A flowchart illustrating a structural optimization method for a mechanical component provided in this application;

[0054] Figure 2 A schematic diagram of an overall model provided in this application from a first angle;

[0055] Figure 3 A schematic diagram of an overall model provided in this application from a second angle;

[0056] Figure 4 A schematic diagram of the overall model provided in this application from a third angle;

[0057] Figure 5 A schematic diagram illustrating the application of loads and constraints to a target location of a target mechanical structural component, as provided in this application;

[0058] Figure 6 A schematic diagram for determining the key structure of the target provided in this application;

[0059] Figure 7 A schematic diagram of a structural sub-model provided in this application;

[0060] Figure 8 A comparative diagram of stress cloud diagrams of a center pin seat before and after weight optimization, provided for this application;

[0061] Figure 9 A comparative diagram of stress cloud diagrams for a center pin seat before and after weight optimization, provided for this application;

[0062] Figure 10 A schematic diagram of a target structure weld provided in this application;

[0063] Figure 11 A schematic diagram illustrating the identification of a target critical weld seam provided in this application;

[0064] Figure 12 A schematic diagram of a weld sub-model provided in this application;

[0065] Figure 13 A comparative schematic diagram showing the maximum weld stress of each weld sub-model under corresponding preset working conditions, provided in this application.

[0066] Figure 14 A structural diagram of a structural optimization system for a mechanical structural component provided in this application;

[0067] Figure 15 A schematic diagram of a structural optimization device for a mechanical structural component provided in this application;

[0068] Figure 16 This is a schematic diagram of the structure of a computer-readable storage medium provided in this application. Detailed Implementation

[0069] The core of this invention is to provide a structural optimization method and related components for mechanical structural components. Compared with optimizing the overall model directly, the method separately models the target key structure and / or the target key weld, which reduces the complexity of modeling and optimizing the details of the overall model. Furthermore, it achieves more accurate optimization of the target key structure and / or the target key weld in the target mechanical structural component while meeting the requirements for stress magnitude and fatigue strength.

[0070] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0071] Please refer to Figure 1 , Figure 1 A flowchart illustrating a structural optimization method for a mechanical component provided in this application, the method comprising:

[0072] S11: Establish an overall model of the target mechanical structure component, and apply corresponding loads and constraints to the target positions on the overall model corresponding to the preset working conditions in order to obtain strength analysis data;

[0073] To improve the safety and reliability of mechanical structural components, increase the utilization rate of materials and structures, and reduce the cost of mechanical structural components throughout their entire life cycle, it is usually necessary to optimize the structure of mechanical structural components. For example, if the mechanical structural components already meet the actual requirements, further weight reduction can be carried out on the mechanical structural components to reduce losses during train operation.

[0074] Traditional optimization of mechanical structural components typically involves optimizing the entire component. For example, in a rail transit system, after modeling the overall structure of the bogie, the weight of the entire bogie is directly optimized. However, due to the large size of mechanical structural components like bogies, the modeling work required for optimizing the overall model is extremely cumbersome. Furthermore, optimizing the overall model requires considering numerous optimization conditions, and too many constraints can lead to insufficient optimization results. In addition, weld modeling is usually omitted when modeling the overall mechanical structural component; that is, there are no welds between adjacent plates in the overall model. While the stress on the weld can be analyzed using the nominal stress method, the analysis process is easily affected by the joint type of the weld, resulting in poor optimization results. Alternatively, weld modeling can be based on fracture mechanics, but mechanical structural components usually include multiple welds. Modeling each weld would reduce the efficiency of overall model building and optimization.

[0075] Based on this, this application establishes an overall model of the target mechanical structural component, which can be any component in a rail transit system, including but not limited to bogies, pantographs, and rails. Specifically, establishing an overall model of the target mechanical structural component can be a finite element analysis model. According to the actual application scenario of the target mechanical structural component, preset working conditions for structural optimization are determined. These preset working conditions include loads and constraints applied at the target location. Based on this, loads and constraints corresponding to the preset working conditions are applied to the target location on the overall model, thereby obtaining strength analysis data of the overall model under the preset working conditions. The strength analysis data includes, but is not limited to, stress and deformation data at various points on the overall model after being subjected to loads and constraints under the preset working conditions.

[0076] Please refer to Figure 2 , Figure 3 and Figure 4 , Figure 2 A schematic diagram of an overall model provided in this application from a first angle. Figure 3A schematic diagram of an overall model provided in this application from a second angle. Figure 4 This is a schematic diagram of the overall model provided in this application from a third angle. Please refer to... Figure 5 , Figure 5 This application provides a schematic diagram of applying loads and constraints to a target position of a target mechanical structure component, wherein the constraint application position and the load application position are target positions corresponding to preset working conditions.

[0077] It should be noted that when building the overall model, finite element software can be used for modeling. Shell mesh elements and volume mesh elements are used to discretize the entire target mechanical structure component using finite element methods. The element mesh size of the overall model can be, but is not limited to, 10 mm. For example, the overall model of the bogie can be discretized into 207,530 nodes and 211,291 element meshes. Based on this, a larger element mesh size can reduce the complexity of building the overall model. In particular, for mechanical structure components with large volumes, the difficulty of building the overall model is significantly reduced.

[0078] The target mechanical structural component may be, but is not limited to, any rail transit component in the rail transit system.

[0079] S12: Based on strength analysis data, determine the target critical structure and / or target critical weld in the target mechanical structure component, and establish a structural sub-model of the target critical structure, and / or establish a weld sub-model of the target critical weld;

[0080] Based on the strength analysis data of the overall model, the target critical structures and / or target critical welds in the target mechanical structural components are determined. That is, the target critical welds and / or target critical structures that need further optimization are extracted from the target mechanical structural components, and more detailed structural sub-models and / or weld sub-models are established for the target critical structures and / or target critical welds respectively, so as to optimize the specific target critical structures and target critical welds and reduce the complexity of optimizing the overall model.

[0081] When establishing structural sub-models of key target structures and / or weld sub-models of key target welds, in order to improve the accuracy of the analysis of structural sub-models and / or weld sub-models, relatively smaller unit meshes can be used to create the sub-models. For example, the unit mesh size of the structural sub-model and / or weld sub-model is 5mm. Since the volume of the structural sub-model and / or weld sub-model is relatively small, the structure of the structural sub-model and / or weld sub-model is more refined without increasing the modeling complexity. This allows for more accurate optimization of the structural sub-model and / or weld sub-model.

[0082] It should be noted that the preset working conditions corresponding to the target key structure and target key weld determined in this application may be the same or different, and this application does not limit this.

[0083] It should also be noted that several target key structures and / or several target key welds can be extracted from the overall model according to different preset working conditions, and the corresponding structural sub-models of each target key structure and the corresponding weld sub-models of each target key weld can be established. The optimization process of the structural sub-models of different target key structures and the optimization process of the weld sub-models of different target key welds do not affect each other.

[0084] S13: Perform weight optimization on the structural sub-model based on the first objective optimization condition. The first objective optimization condition includes that the maximum structural stress value of the structural sub-model under the preset working condition is not higher than the preset maximum structural stress value.

[0085] When optimizing the structural sub-model, the optimization objective is weight reduction, that is, reducing the weight of the structural sub-model. The first objective optimization condition is that the maximum structural stress value of the structural sub-model during the weight optimization process should not exceed the preset maximum structural stress value. This ensures that the stress of the structural sub-model meets the requirements while minimizing its weight. Based on this, the overall weight of the structural sub-model can be effectively reduced, thereby reducing the overall weight of the target mechanical structural component.

[0086] It should be noted that since the target key structure corresponding to the structural sub-model is extracted from the overall model, the overall size of the structural sub-model will not change when performing weight optimization on the structural sub-model. This ensures that the weight-optimized structural sub-model can still be used as part of the overall model, facilitating the subsequent reconstruction of the target mechanical structure component after structural optimization.

[0087] S14: Perform geometric feature optimization on the weld sub-model based on the second objective optimization conditions. The second objective optimization conditions include maximizing the fatigue life of the weld sub-model under preset working conditions.

[0088] Since a weld is a joint area formed by connecting two or more metal parts through a welding process, the shape of the weld, especially its edge, i.e., the weld toe, is usually not smooth but abrupt. Welds are highly susceptible to cracking under repeated loads. Furthermore, because the weld area includes weld metal, heat-affected zone, and base metal, these three materials have different properties and grain structures. This inhomogeneity makes the weld more vulnerable to damage. The intense heating and cooling during welding causes uneven expansion and contraction of the metal, leaving residual stress within the component. This residual stress, combined with the external forces experienced by the component during operation, accelerates weld failure. Therefore, it is essential to optimize the geometric features of key welds in target mechanical structural components to improve their fatigue life.

[0089] Therefore, when optimizing the weld sub-model of the target critical weld, the geometric features of the weld sub-model are optimized to maximize the fatigue life of the weld sub-model under the preset working conditions. In other words, the geometric features that maximize the fatigue life of the weld sub-model under the preset working conditions are determined.

[0090] S15: Based on the structural sub-model after weight optimization and the weld sub-model after geometric feature optimization, determine the overall model after structural optimization, and then determine the target mechanical structural component after structural optimization.

[0091] After performing weight optimization on the structural sub-model and / or geometric feature optimization on the weld sub-model, the overall model after structural optimization is re-established based on the optimized structural sub-model and / or weld sub-model to determine the structural optimization results of the target mechanical structural component. The target mechanical structural component is then produced based on the structurally optimized target mechanical structural component to improve its service life and reduce its wear.

[0092] Of course, after the overall model of the structure optimization is established, corresponding loads and constraints can be applied to the target positions of the optimized overall model again according to preset working conditions to obtain the strength analysis data after structural optimization. Based on the strength analysis data after structural optimization, the optimization effect of the target critical structure and target critical weld of the target mechanical structural component after structural optimization can be determined. For example, based on the strength analysis data after structural optimization, it can be determined whether the stress concentration of the target critical structure and / or target critical weld of the target mechanical structural component has decreased compared with that before structural optimization. If it has decreased, it is determined that the optimization effect of the target mechanical structural component is good.

[0093] Furthermore, when applying corresponding loads and constraints to the target positions on the overall model according to the preset working conditions to obtain strength analysis data, the strength analysis data can be the stress cloud map of the overall model of the target mechanical structure component. Before optimizing the target mechanical structure component, the stress concentration area in the stress cloud map of the overall model of the target mechanical structure component can be observed according to the colors of different stress value ranges set in the stress cloud map in advance, thereby identifying the target key structure and / or target key weld. After determining the overall model after structural optimization based on the structural sub-model after weight optimization and the weld sub-model after geometric feature optimization, the stress cloud map of the overall model after structural optimization can be obtained again to observe whether the stress in the stress concentration area in the stress cloud map of the overall model after structural optimization is smoothly dispersed. If so, the optimization effect is good, and the target mechanical structure component after structural optimization can be determined.

[0094] In summary, compared to directly optimizing the overall model, modeling the target critical structure and / or target critical weld separately reduces the complexity of modeling and optimizing the details of the overall model. Furthermore, while meeting the requirements for stress magnitude and fatigue strength, it enables more precise optimization of the target critical structure and / or target critical weld in the target mechanical structural component.

[0095] Based on the above embodiments:

[0096] As a preferred embodiment, loads and constraints are applied to the target locations on the overall model corresponding to the preset working conditions to obtain strength analysis data, including:

[0097] According to different preset working conditions, corresponding loads and constraints are applied to the target positions on the target mechanical structure components corresponding to each preset working condition, so as to obtain strength analysis data under different preset working conditions;

[0098] Based on strength analysis data, the target critical structures and / or target critical welds in the target mechanical structural components are identified, including:

[0099] Based on the stress and deformation data in the strength analysis data under different preset working conditions, the target key structures corresponding to different preset working conditions and / or the target key welds corresponding to different preset working conditions are determined.

[0100] This embodiment includes a variety of different preset working conditions. The target positions corresponding to different preset working conditions may be the same or different. The loads and constraints at the corresponding target positions of different preset working conditions may also be the same or different. However, the target positions, loads and constraints corresponding to different preset working conditions are not completely the same. Several extraordinary working conditions and conventional working conditions can be established for the bogie, which is the target mechanical structural component, according to the actual engineering situation.

[0101] After the overall model is established, loads and constraints are applied sequentially to the target positions on the overall model according to different preset working conditions, with only one preset working condition applied to the overall model at a time. Based on this, the target critical structure and / or target critical weld under different preset working conditions can be determined. For example, when loads and constraints are applied to the target positions on the overall model according to working conditions 11 and 12 of several preset working conditions, the stress and deformation data in the strength analysis data corresponding to working conditions 11 and 12 can be used to determine that the center pin seat is the target critical structure. Similarly, when loads and constraints are applied to the target positions on the overall model according to working conditions 20 and 21 of several preset working conditions, the suspension device can be used to determine that the suspension device is the target critical structure. This application does not limit this aspect. Of course, when applying the corresponding loads and constraints to the target positions on the overall model according to the conditions 2 and 8 in several preset conditions, the stress data and deformation data in the strength analysis data corresponding to conditions 2 and 8 can be used to determine that the weld between the top cover plate and the side plate is the target key weld.

[0102] It should be noted that the optimization of the target key results and / or target key welds is based on the corresponding preset working conditions.

[0103] As a preferred embodiment, the target critical structure corresponding to different preset working conditions and / or the target critical weld corresponding to different preset working conditions are determined based on stress data and deformation data in strength analysis data under different preset working conditions, including:

[0104] Based on the stress and deformation data from the strength analysis data under different preset working conditions, the stress concentration areas in the overall model are determined.

[0105] The structures located in stress concentration regions in the overall model under different preset working conditions are respectively identified as target key structures corresponding to different preset working conditions;

[0106] And / or, the welds located in the stress concentration region in the overall model under different preset working conditions are identified as the target critical welds corresponding to the different preset working conditions.

[0107] When identifying target critical structures and / or target critical welds, stress concentration areas are determined based on stress and deformation data from strength analysis data of the overall model under different preset working conditions. The structures and / or welds within these stress concentration areas are then identified as target critical structures and / or target critical welds. Optimization of these target critical structures and / or target critical welds within the stress concentration areas aims to make stress more uniform and smooth, thereby improving the lifespan of the target mechanical structural components. Please refer to [reference needed]. Figure 6 , Figure 6 This is a schematic diagram illustrating the determination of a key target structure provided in this application. Please refer to... Figure 7 , Figure 7 A schematic diagram of a structural sub-model provided in this application.

[0108] It should be noted that before optimization, the stress received by the target critical structure and target critical weld under the corresponding preset working conditions was already within an acceptable range. By further optimizing the target critical structure and / or target critical weld, the problem of stress concentration at the target critical structure and / or target critical weld can be further alleviated, and energy saving and consumption reduction can be achieved, the inertia of the target mechanical structure components can be reduced, and the reliability and practicality of the target mechanical structure components can be ensured.

[0109] As a preferred embodiment, the structural sub-model is subjected to weight optimization based on the first objective optimization condition, including:

[0110] The structural sub-model is optimized by reducing plate thickness to decrease its weight.

[0111] Determine the minimum weight of the structural sub-model under the condition of satisfying the first objective optimization, and determine the structural sub-model corresponding to the minimum weight as the structural sub-model after weight optimization.

[0112] When performing weight optimization on the structural sub-model, the plate thickness of the structural sub-model is reduced to decrease its weight. Specifically, while meeting the first objective optimization condition, the plate thickness of the structural sub-model is gradually reduced until the minimum weight of the structural sub-model that meets the first objective optimization condition is determined. The structural sub-model corresponding to the minimum weight is the weight-optimized structural sub-model.

[0113] For example, finite element strength analysis software can be used to optimize the weight of the structural sub-model. The finite element strength analysis software optimizes the thickness of each plate in the structural sub-model and performs multiple iterations until the minimum weight that ensures the maximum structural stress value of the structural sub-model under the preset working conditions is not higher than the preset maximum structural stress value is determined.

[0114] Please refer to Figure 8 andFigure 9 , Figure 8 This is a schematic diagram comparing the stress cloud diagrams of a center pin seat before and after weight optimization, as provided in this application. Figure 9 This is a comparative schematic diagram of stress cloud diagrams for a center pin seat before and after weight optimization, provided in this application. Figure 8 and Figure 9 Taking the central pin seat as a key structure as an example, it is stipulated that blue represents the area with the least stress, and red represents the area with the greatest and most concentrated stress. Figure 8 The left side shows the stress cloud diagram of the structural sub-model of the center pin seat under working condition 11 without weight optimization. The right side shows the stress cloud diagram of the structural sub-model of the center pin seat under working condition 11 after weight optimization. It can be seen that after weight optimization, the stress on the part of the structural sub-model of the center pin seat under working condition 11 without weight optimization is reduced and more dispersed. Figure 9 The left side shows the stress cloud diagram of the structural sub-model of the center pin seat under working condition 12 without weight optimization. The right side shows the stress cloud diagram of the structural sub-model of the center pin seat under working condition 12 after weight optimization. It can be seen that after weight optimization, the stress on the part of the structural sub-model of the center pin seat under working condition 12 without weight optimization is reduced and more dispersed.

[0115] As a preferred embodiment, determining the minimum weight of the structural sub-model under the condition of satisfying the first objective optimization, and determining the structural sub-model corresponding to the minimum weight as the structural sub-model after weight optimization, includes:

[0116] Based on the preset deformation data of each position point of the structural sub-model when the corresponding load and constraint are applied to the target position on the overall model according to the preset working condition, the target deformation data of each position point of the structural sub-model in the weight optimization process are sequentially the corresponding preset deformation data, so as to obtain the structural strength analysis data of the structural sub-model in the weight optimization process.

[0117] Based on the stress data in the structural strength analysis data, the structural stress concentration area of ​​the structural sub-model is determined, and the maximum structural stress in the structural stress concentration area is determined.

[0118] Determine the minimum weight of the structural sub-model when the maximum structural stress is not higher than the preset maximum structural stress value, and determine the structural sub-model corresponding to the minimum weight as the structural sub-model after weight optimization.

[0119] In this embodiment, when determining the minimum weight of the structural sub-model, it is necessary to ensure that the first objective optimization condition is met. Specifically, during the process of applying corresponding loads and constraints to the target positions on the overall model corresponding to the preset working conditions according to the preset working conditions, the preset deformation data of the structural sub-model at each position point is recorded. During the process of adjusting the plate thickness of the structural sub-model, the target deformation data of each position point of the structural sub-model is sequentially replaced with the corresponding preset deformation data to simulate the preset deformation data generated by the structural sub-model at each position point under the preset working conditions during the weight optimization process. During the weight optimization process, the structural stress concentration area of ​​the structural sub-model is determined based on the structural strength analysis data of the structural sub-model. The maximum structural stress is determined from the stress concentration area. The minimum weight of the structural sub-model is determined when the maximum structural stress of the structural sub-model is not greater than the preset maximum structural stress value, and the structural sub-model corresponding to the minimum weight is determined as the structural sub-model after weight optimization.

[0120] When acquiring structural strength analysis data, the data can also be the stress cloud map of the structural sub-model. Before optimizing the structural sub-model, the stress concentration areas in the stress cloud map can be observed based on the colors of different stress value ranges pre-set in the stress cloud map of the structural sub-model, thereby determining the maximum structural stress. After determining the structural sub-model after weight optimization, the stress cloud map of the weight-optimized structural sub-model can be acquired again to observe whether the stress in the stress concentration areas of the weight-optimized structural sub-model is smoothly dispersed. If so, the optimization effect is good.

[0121] As a preferred embodiment, after determining the minimum weight of the structural sub-model when the maximum structural stress is not higher than a preset maximum structural stress value, and determining the structural sub-model corresponding to the minimum weight as the weight-optimized structural sub-model, the method further includes:

[0122] The target structural weld is determined from the stress concentration area of ​​the structural sub-model after weight optimization, and the maximum structural weld stress value of the target structural weld is determined based on the structural strength analysis data.

[0123] The minimum fatigue life prediction value of the target structural weld is determined from the stress-life curve based on the maximum structural weld stress value.

[0124] If the minimum fatigue life prediction value is not lower than the minimum weight of the structural sub-model when the first preset fatigue life prediction value is not lower, then the optimization of the structural sub-model is determined to be complete.

[0125] Please refer to Figure 10 , Figure 10 This application provides a schematic diagram of a weld seam in a target structure. Figure 10 The dashed lines in the diagram represent the weld seams of the target structure.

[0126] To ensure the durability of the weight-optimized structural sub-model, the minimum weight of the sub-model is determined by analyzing structural strength data to identify target structural welds within stress concentration areas. The maximum stress value of these welds is then determined, and the minimum predicted fatigue life corresponding to this maximum stress value is calculated from the stress-life curve. If this minimum predicted fatigue life is not lower than a first preset predicted fatigue life value, the weight-optimized sub-model meets the fatigue life requirements. If the minimum predicted fatigue life is lower than the first preset predicted fatigue life value, the sub-model undergoes weight optimization again until the minimum weight is determined where the maximum structural stress is not higher than the preset maximum structural stress value, and the minimum predicted fatigue life is not lower than the first preset predicted fatigue life value.

[0127] As a preferred embodiment, a weld sub-model of the target critical weld is established, including:

[0128] Several different geometric feature data are determined. The geometric feature data include the preset weld leg size and the preset weld thickness. The preset weld leg size is within the range of the preset weld leg size, and the preset weld thickness is within the range of the preset weld thickness.

[0129] Several weld sub-models of the target critical weld are established based on each geometric feature data;

[0130] Based on the second objective optimization conditions, the geometric features of the weld sub-model are optimized, including:

[0131] The target geometric feature data of the weld sub-model are determined under the condition of satisfying the second objective optimization, so as to realize the geometric feature optimization processing of the weld sub-model.

[0132] In the process of optimizing the weld sub-model, several preset weld leg sizes and several preset weld thicknesses are selected based on the pre-defined range of preset weld leg sizes and preset weld thicknesses. Different preset weld leg sizes and different preset weld thicknesses are combined to determine several geometric feature data. When building the weld sub-model, several weld sub-models are built based on different geometric feature data. That is, each weld sub-model of the target key weld corresponds to a set of geometric feature data. From these several weld sub-models, the weld sub-model that meets the second objective optimization condition is selected as the weld sub-model after geometric feature optimization.

[0133] For example, if the target critical weld is a weld obtained by welding 14mm and 11mm thick steel plates using a single-sided corner joint, then the preset weld thickness range is 3.5mm-8.8mm, and the preset weld leg size range is 5mm-12.5mm. Based on this, four sets of geometric feature data are determined: the first set of geometric feature data has a preset weld leg size of 5mm and a preset weld thickness of 3.5mm; the second set has a preset weld leg size of 7.5mm and a preset weld thickness of 5.3mm; the third set has a preset weld leg size of 10mm and a preset weld thickness of 7.0mm; and the fourth set has a preset weld leg size of 12.5mm and a preset weld thickness of 8.8mm. A first sub-model of the target critical weld is established based on the first set of geometric feature data; a second sub-model is established based on the second set; a third sub-model is established based on the third set; and a fourth sub-model is established based on the fourth set. The fatigue life of the four weld sub-models under the preset working conditions is determined, and the weld sub-model with the longest fatigue life among the four weld sub-models is determined as the target key weld sub-model after geometric feature optimization.

[0134] Please refer to Figure 11 , Figure 11 This is a schematic diagram illustrating the method for determining a target critical weld seam, as provided in this application. As can be seen in the diagram, the target critical weld seam is not modeled in the overall model. Please refer to... Figure 12 , Figure 12 This is a schematic diagram of a weld sub-model provided in this application, in which it can be seen that the weld model is performed at the target critical weld.

[0135] It should be noted that when determining the target critical weld, it is necessary to identify the two plates welded by the target critical weld and define the boundaries between the two plates. Based on these boundaries, a weld sub-model of the target critical weld can be established, such as... Figure 11 As shown. Figure 12 The yellow and red sections represent the two plates connected by the target critical weld, while the green section represents the target critical weld.

[0136] As a preferred embodiment, the target geometric feature data of the weld sub-model are determined under the condition of satisfying the second objective optimization, including:

[0137] Based on the preset deformation data of each position point of the weld sub-model when the corresponding load and constraint are applied to the target position corresponding to the preset working condition on the overall model according to the preset working condition, the target deformation data of each position point of each weld sub-model is controlled to be the corresponding preset deformation data in turn, so as to obtain the weld strength analysis data of each weld model.

[0138] The maximum weld stress of each weld sub-model is determined based on the weld strength analysis data of each weld sub-model.

[0139] Based on the maximum weld stress of each weld sub-model, the minimum predicted weld fatigue life value corresponding to each weld sub-model is determined from the stress-life curve.

[0140] The maximum value among the lowest predicted fatigue life values ​​for each weld sub-model is determined as the maximum fatigue life.

[0141] The geometric feature data of the weld sub-model corresponding to the maximum fatigue life are determined as the target geometric feature data.

[0142] In this embodiment, the preset deformation data of each position point of the weld sub-model is obtained when the corresponding load and constraint are applied to the target position on the overall model according to the preset working condition. The target deformation data of each position point of each weld sub-model is controlled to be the corresponding preset deformation data in sequence. Weld strength analysis data of different weld sub-models are obtained, and then the maximum weld stress of each weld sub-model is determined according to the weld strength analysis data of different weld sub-models. Then, the minimum weld fatigue life prediction value corresponding to each weld sub-model is determined from the stress-life curve. The minimum weld fatigue life prediction values ​​of each weld sub-model are sorted to determine the largest minimum weld fatigue life prediction value, and the geometric feature data of the corresponding weld sub-model is determined as the target geometric feature data.

[0143] Taking the aforementioned four weld sub-models as examples, after setting the target deformation data of each position point of the four weld sub-models as the preset deformation data, the weld strength analysis data of each weld sub-model is determined, and then the maximum weld stress of the four welds is determined. Since the fatigue life is lowest at the maximum weld stress, the minimum predicted weld fatigue life of the four weld sub-models can be determined. Thus, the weld sub-model with the largest minimum predicted weld fatigue life among the four weld sub-models is determined as the weld sub-model after geometric feature optimization of the target key weld. Based on working conditions 2 and 8, the target critical weld was determined. After the target deformation data of each location point of the first weld sub-model was determined to be the preset deformation data corresponding to working condition 2, the maximum weld stress of the first weld sub-model was |-203.59| MPa. From the stress-life curve, the predicted minimum weld fatigue life value corresponding to the first weld sub-model was determined to be 1.97E+05 cycles. After the target deformation data of each location point of the first weld model was determined to be the preset deformation data corresponding to working condition 8, the maximum weld stress of the first weld sub-model was |-203.59| MPa. The maximum value is |-220.27| MPa. From the stress-life curve, the predicted minimum weld fatigue life for the first weld sub-model is determined to be 1.54E+05 cycles. After determining the target deformation data for each point of the second weld sub-model as the preset deformation data under working condition 2, the maximum weld stress of the second weld sub-model is |-191.30| MPa. From the stress-life curve, the predicted minimum weld fatigue life for the second weld sub-model is determined to be 2.38E+05 cycles. The predicted minimum weld fatigue life for each point of the second weld sub-model is determined to be |-191.30| MPa. After the deformation data was determined to be the preset deformation data corresponding to working condition 8, the maximum weld stress of the second weld sub-model was |-207.08| MPa. From the stress-life curve, the predicted minimum weld fatigue life for the second weld sub-model was determined to be 1.86E+05 cycles. After the target deformation data for each point of the third weld sub-model was determined to be the preset deformation data corresponding to working condition 2, the maximum weld stress of the third weld sub-model was |-178.78| MPa. From the stress-life curve, the predicted minimum weld fatigue life for the third weld sub-model was determined to be 1.86E+05 cycles. The predicted fatigue life is 2.38E+05 cycles. After determining the target deformation data of each location point of the third weld sub-model to be the preset deformation data corresponding to working condition 8, the maximum weld stress of the third weld sub-model is |-193.86| MPa. From the stress-life curve, the predicted minimum weld fatigue life of the third weld sub-model is determined to be 2.26E+05 cycles. After determining the target deformation data of each location point of the fourth weld sub-model to be the preset deformation data corresponding to working condition 2, the maximum weld stress of the fourth weld sub-model is |-180|.The minimum predicted weld fatigue life for the fourth weld sub-model is 2.99E+05 cycles, determined from the stress-life curve. After determining the target deformation data for each point of the fourth weld sub-model as the preset deformation data under working condition 8, the maximum weld stress of the fourth weld sub-model is |-197.70| MPa. The minimum predicted weld fatigue life for the fourth weld sub-model is 2.26E+05 cycles, determined from the stress-life curve. Based on this, it can be determined that the minimum predicted weld fatigue life for the fourth weld sub-model is the largest under working condition 2, and the minimum predicted weld fatigue life for the third and fourth weld sub-models is the largest under working condition 8. However, since the minimum predicted weld fatigue life for the fourth weld model is the largest under working condition 8, the geometric feature data of the fourth weld model is determined as the target geometric feature data. That is, the fourth weld sub-model is the weld sub-model of the target key weld after geometric feature optimization. In addition, see reference. Figure 13 , Figure 13 This diagram illustrates the comparison of maximum weld stress values ​​for various weld sub-models under corresponding preset working conditions, as provided in this application. In the diagram, Weld5mm represents the first weld sub-model, Weld7.5mm represents the second weld sub-model, Weld10mm represents the third weld sub-model, and Weld12.5mm represents the fourth weld sub-model. The left side represents the weld stress. In the two bar graphs corresponding to each weld sub-model, the left bar graph represents the maximum weld stress value under working condition 2, and the right bar graph represents the maximum weld stress value under working condition 8. It can be seen that the maximum weld stress values ​​of the third and fourth weld sub-models under working conditions 2 and 8 are relatively small. Based on this, the first and second weld sub-models can be excluded in advance. Then, the weld sub-models after geometric feature optimization are determined based on the lowest predicted weld fatigue life values ​​of the third and fourth weld sub-models to improve efficiency.

[0144] It should be noted that the maximum weld stress, maximum structural stress, and maximum structural weld stress mentioned in this application are all absolute values ​​of their respective stress values.

[0145] When acquiring weld strength analysis data, the data can also be a stress cloud map of the weld sub-model. Before optimizing the weld sub-model, the location of the maximum weld stress in the stress cloud map can be observed based on the colors of different stress value ranges pre-set in the stress cloud map, and the maximum stress value at that location can be determined. After determining the weld sub-model after geometric feature optimization, the stress cloud map of the geometric feature optimized weld model can be acquired again to observe whether the stress at the location of the maximum weld stress in the stress cloud map of the geometric feature optimized weld model is smoothly dispersed. If so, the optimization effect is good.

[0146] Please refer to Figure 14 , Figure 14 A structural diagram of a structural optimization system for a mechanical structural component provided in this application is provided. The system includes:

[0147] Model building unit 141 is used to build an overall model of the target mechanical structure component, and apply corresponding loads and constraints to the target position on the overall model corresponding to the preset working conditions according to the preset working conditions in order to obtain strength analysis data;

[0148] The first determining unit 142 is used to determine the target key structure and / or target key weld in the target mechanical structure component based on strength analysis data, and to establish a structural sub-model of the target key structure and / or establish a weld sub-model of the target key weld.

[0149] The first optimization unit 143 is used to perform weight optimization processing on the structural sub-model based on the first objective optimization condition. The first objective optimization condition includes that the maximum structural stress value of the structural sub-model under the preset working condition is not higher than the preset maximum structural stress value.

[0150] The second optimization unit 144 is used to perform geometric feature optimization processing on the weld sub-model based on the second objective optimization conditions. The second objective optimization conditions include maximizing the fatigue life of the weld model under preset working conditions.

[0151] The second determining unit 145 is used to determine the overall model after structural optimization based on the structural sub-model after weight optimization and the weld sub-model after geometric feature optimization, and then determine the target mechanical structure component after structural optimization.

[0152] For a description of the structural optimization system for mechanical components provided by this invention, please refer to the above method embodiments; further details of this invention will not be repeated here.

[0153] Please refer to Figure 15 , Figure 15 A structural diagram of a structural optimization device for a mechanical structural component provided in this application is provided. The device includes:

[0154] Memory 151 is used to store computer programs;

[0155] The processor 152 is used to implement the steps of the structural optimization method for mechanical structural components as described above when executing a computer program.

[0156] For a description of the structural optimization device for mechanical structural components provided by the present invention, please refer to the above method embodiments; the present invention will not be described again here.

[0157] Please refer to Figure 16 , Figure 16 This is a schematic diagram of a computer-readable storage medium provided in this application. The computer-readable storage medium 161 stores a computer program 162. When the computer program 162 is executed by the processor 152, it implements the steps of the above-described method for optimizing the structure of mechanical components.

[0158] For a description of the computer-readable storage medium provided by the present invention, please refer to the above method embodiments; the present invention will not be described again here.

[0159] It should also be noted that, in this specification, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0160] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for structural optimization of a mechanical component, characterized in that, include: Establish an overall model of the target mechanical structure component, and apply corresponding loads and constraints to the target positions on the overall model corresponding to the preset working conditions according to the preset working conditions in order to obtain strength analysis data; Based on the strength analysis data, the target critical structure and / or target critical weld in the target mechanical structure component are determined, and a structural sub-model of the target critical structure and / or a weld sub-model of the target critical weld are established. The structural sub-model is subjected to weight optimization based on the first objective optimization condition, wherein the first objective optimization condition includes that the maximum structural stress value of the structural sub-model under the preset working condition is not higher than the preset maximum structural stress value. The weld sub-model is subjected to geometric feature optimization based on the second objective optimization condition, which includes maximizing the fatigue life of the weld sub-model under the preset working condition. Based on the structural sub-model after weight optimization and the weld sub-model after geometric feature optimization, the overall model after structural optimization is determined, and then the target mechanical structural component after structural optimization is determined.

2. The structural optimization method for mechanical structural components as described in claim 1, characterized in that, According to the preset working conditions, corresponding loads and constraints are applied to the target positions on the overall model corresponding to the preset working conditions to obtain strength analysis data, including: According to different preset working conditions, corresponding loads and constraints are applied to the target positions on the target mechanical structure component, respectively, to obtain strength analysis data under different preset working conditions; Based on the strength analysis data, the target critical structures and / or target critical welds in the target mechanical structural component are determined, including: Based on the stress and deformation data in the strength analysis data under different preset working conditions, the target key structures corresponding to different preset working conditions and / or the target key welds corresponding to different preset working conditions are determined.

3. The structural optimization method for mechanical structural components as described in claim 2, characterized in that, Based on stress and deformation data from strength analysis data under different preset working conditions, the target critical structures corresponding to different preset working conditions and / or the target critical welds corresponding to different preset working conditions are determined, including: The stress concentration areas in the overall model are determined based on the stress and deformation data in the strength analysis data under different preset working conditions. Under different preset working conditions, the structures located in the stress concentration region of the overall model are respectively identified as the target key structures corresponding to the different preset working conditions; And / or, the welds located in the stress concentration region in the overall model under different preset working conditions are identified as the target critical welds corresponding to the different preset working conditions.

4. The structural optimization method for mechanical structural components as described in claim 1, characterized in that, The structural sub-model is subjected to weight optimization based on the first objective optimization condition, including: The structural sub-model is optimized by reducing plate thickness to decrease its weight. Determine the minimum weight of the structural sub-model under the condition of satisfying the first objective optimization, and determine the structural sub-model corresponding to the minimum weight as the structural sub-model after weight optimization.

5. The structural optimization method for mechanical structural components as described in claim 4, characterized in that, Determining the minimum weight of the structural sub-model under the first objective optimization condition, and identifying the structural sub-model corresponding to the minimum weight as the weight-optimized structural sub-model, includes: Based on the preset deformation data of each position point of the structural sub-model when applying corresponding loads and constraints to the target position corresponding to the preset working condition on the overall model according to the preset working condition, the target deformation data of each position point of the structural sub-model in the weight optimization process is sequentially the corresponding preset deformation data, so as to obtain the structural strength analysis data of the structural sub-model in the weight optimization process. Based on the stress data in the structural strength analysis data, the structural stress concentration region of the structural sub-model is determined, and the maximum structural stress in the structural stress concentration region is determined. The minimum weight of the structural sub-model is determined when the maximum structural stress is not higher than the preset maximum structural stress value, and the structural sub-model corresponding to the minimum weight is determined as the weight-optimized structural sub-model.

6. The structural optimization method for mechanical structural components as described in claim 5, characterized in that, After determining the minimum weight of the structural sub-model when the maximum structural stress is not higher than the preset maximum structural stress value, and identifying the structural sub-model corresponding to the minimum weight as the weight-optimized structural sub-model, the process further includes: The target structural weld is determined from the stress concentration region of the structural sub-model after weight optimization, and the maximum structural weld stress value of the target structural weld is determined based on the structural strength analysis data. The minimum fatigue life prediction value of the target structural weld is determined from the stress-life curve based on the maximum structural weld stress value. If the minimum fatigue life prediction value is not lower than the first preset fatigue life prediction value, then the optimization of the structural sub-model is determined to be complete.

7. The structural optimization method for mechanical structural components as described in any one of claims 1-6, characterized in that, Establishing a weld sub-model for the target critical weld includes: Several different geometric feature data are determined, including a preset weld leg size and a preset weld thickness, wherein the preset weld leg size is within a preset weld leg size range and the preset weld thickness is within a preset weld thickness range; Several weld sub-models of the target critical weld are established based on each of the aforementioned geometric feature data; Based on the second objective optimization condition, the geometric feature optimization process of the weld sub-model is performed, including: The target geometric feature data of the weld sub-model are determined under the condition of satisfying the second objective optimization, so as to realize the geometric feature optimization processing of the weld sub-model.

8. The structural optimization method for mechanical structural components as described in claim 7, characterized in that, Determine the target geometric feature data of the weld sub-model under the condition of satisfying the second objective optimization, including: Based on the preset deformation data of each position point of the weld sub-model when applying corresponding loads and constraints to the target position corresponding to the preset working condition on the overall model, the target deformation data of each position point of each weld sub-model is controlled to be the corresponding preset deformation data in turn, so as to obtain the weld strength analysis data of each weld model. The maximum weld stress of each weld sub-model is determined based on the weld strength analysis data of each weld sub-model. Based on the maximum weld stress of each weld sub-model, the minimum predicted weld fatigue life value corresponding to each weld sub-model is determined from the stress-life curve; The maximum value among the lowest predicted fatigue life values ​​corresponding to each of the weld sub-models is determined as the maximum fatigue life. The geometric feature data of the weld sub-model corresponding to the maximum fatigue life is determined as the target geometric feature data.

9. A structural optimization system for a mechanical structural component, characterized in that, include: The model building unit is used to build an overall model of the target mechanical structure component, and apply corresponding loads and constraints to the target position on the overall model corresponding to the preset working conditions according to the preset working conditions in order to obtain strength analysis data; The first determining unit is used to determine the target critical structure and / or target critical weld in the target mechanical structure component based on the strength analysis data, and to establish a structural sub-model of the target critical structure and / or establish a weld sub-model of the target critical weld; The first optimization unit is used to perform weight optimization processing on the structural sub-model based on the first target optimization condition, wherein the first target optimization condition includes that the maximum structural stress value of the structural sub-model under the preset working condition is not higher than the preset maximum structural stress value. The second optimization unit is used to perform geometric feature optimization processing on the weld sub-model based on the second objective optimization condition, the second objective optimization condition including maximizing the fatigue life of the weld model under the preset working condition; The second determining unit is used to determine the overall model after structural optimization based on the structural sub-model after weight optimization and the weld sub-model after geometric feature optimization, and then determine the target mechanical structure component after structural optimization.

10. A structural optimization device for a mechanical structural component, characterized in that, include: Memory, used to store computer programs; A processor, configured to, when executing a computer program, implement the steps of the structural optimization method for a mechanical structural component as described in any one of claims 1-8.

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