Gearbox shell finite element modeling method and system

Abstract

The invention discloses a gearbox shell finite element modeling method which comprises the following steps: acquiring a gearbox shell mathematical model and preprocessing the gearbox shell mathematical model to obtain a totally-closed shell geometry; dividing into a target area, a transition area and an auxiliary area based on the shell geometry, and correspondingly setting attribute information; respectively carrying out finite element two-dimensional grid division on the basis of the target area, the transition area and the auxiliary area to obtain a shell two-dimensional grid; releasing a first association relationship between the shell geometry and the shell two-dimensional grid, and deleting the shell geometry to obtain a two-dimensional grid model; reconstructing the two-dimensional grid of the transition area based on the two-dimensional grid model to generate a new two-dimensional grid model; generating a three-dimensional grid model based on the two-dimensional grid model, releasing the second association relationship, and deleting the two-dimensional grid model; corresponding attribute information is given based on the three-dimensional mesh model, and a finite element model of the gearbox shell is obtained. The finite element modeling efficiency of the gearbox is improved, the model calculation time is saved, and the development period is shortened.

Description

Technical Field

[0001] The present invention relates to the technical field of finite element modeling methods, and more particularly to a finite element modeling method and system for a gearbox housing. Background Art

[0002] At present, with the rapid development of the automobile industry and the continuous improvement of technology, the gearbox, as a key component in the vehicle power transmission system, has a direct impact on the power, economy and comfort of the vehicle. In modern automobile design, higher requirements are placed on the gearbox's structural strength, vibration characteristics, thermodynamic behavior and other performance aspects. Therefore, how to efficiently and accurately model and analyze the gearbox to ensure that it meets the design standards and optimizes its performance has become an important research topic.

[0003] Traditional gearbox modeling methods mainly rely on empirical design combined with experimental verification. This method is not only time-consuming but also costly, especially when faced with complex structures or the application of new materials. In recent years, the development of computer-aided engineering (CAE) technology has provided a new way to solve this problem. As an important numerical simulation method, finite element analysis has been widely used in the field of mechanical structure analysis. It can discretize actual objects and establish mathematical models to simulate physical phenomena under real conditions, thereby helping engineers better understand product performance and make improvements accordingly.

[0004] However, for components like gearboxes that have complex geometric shapes and need to consider the influence of multiple working conditions, the existing finite element modeling process still has some shortcomings: 1. The modeling process is cumbersome: the generation of 3D CAD models to finite element meshes usually requires multiple conversions and manual adjustments, which not only increases the workload but also easily introduces human errors; 2. Low computational efficiency: Since the gearbox housing often contains a large number of detailed features, directly fine-meshing it will result in a large calculation scale and consume a lot of computing resources; 3. Lack of flexibility: Traditional methods are difficult to respond quickly to the needs of design changes, and each modification may require the entire modeling process to be re-executed.

[0005] Therefore, how to improve the efficiency of gearbox finite element modeling and thus save model calculation time is an urgent problem that technical personnel in this field need to solve. Summary of the invention

[0006] In view of this, the present invention provides a gearbox housing finite element modeling method and system, which improves the gearbox finite element modeling efficiency, saves model calculation time, and shortens the development cycle.

[0007] In order to achieve the above object, the present invention adopts the following technical solution:

[0008] A finite element modeling method for a gearbox housing, comprising:

[0009] Obtain the mathematical model of the gearbox housing and perform preprocessing to obtain a fully enclosed housing geometry;

[0010] Dividing the shell geometry into a target area, a transition area and an auxiliary area, and setting attribute information accordingly;

[0011] Performing finite element two-dimensional mesh division based on the target area, the transition area and the auxiliary area respectively to obtain a two-dimensional mesh of the shell;

[0012] releasing the first association relationship between the shell geometric body and the shell two-dimensional mesh and deleting the shell geometric body to obtain a two-dimensional mesh model;

[0013] Reconstructing the two-dimensional grid of the transition area based on the two-dimensional grid model to generate a new two-dimensional grid model;

[0014] Generate a three-dimensional mesh model based on the two-dimensional mesh model and release the second association relationship, and delete the two-dimensional mesh model;

[0015] Based on the three-dimensional mesh model, the corresponding attribute information is assigned to obtain a finite element model of the gearbox housing.

[0016] Preferably, the preprocessing is specifically: geometric cleaning

[0017] The geometry cleanup includes: deleting small features, filling gaps, fixing topology problems and smoothing surfaces.

[0018] Preferably, the attribute information includes: geometric attributes, color attributes and codes;

[0019] The geometric attributes correspond one-to-one to the color attributes;

[0020] The geometric attributes correspond to the codes one by one.

[0021] Preferably, the auxiliary area is divided into two-dimensional finite element grids, specifically including:

[0022] Write the ANSA_mpar program file to implement all the parameters required for mesh generation, the requirements of various feature processing tools, automatic identification and processing of edges, processing methods for fillet features, chamfer features, and circular hole features, define the storage and association of generated mesh type, mesh order, mesh size, and unit distortion, identification of geometric features, feature filtering, and feature processing methods after filtering, mesh reconstruction methods for tiny geometric features, and perform batch mesh processing to complete the two-dimensional mesh division of the auxiliary area to obtain a two-dimensional mesh of the auxiliary area.

[0023] Preferably, the method further includes performing quality inspection based on the two-dimensional grid of the auxiliary area:

[0024] Writing the ANSA_QUAL program file to obtain the quality assessment parameters of the two-dimensional grid in the auxiliary area: side length ratio index, skewness index, Jacobian index, maximum and minimum grid sizes, maximum and minimum angle indexes, and growth rate index;

[0025] The quality of the two-dimensional grids of the auxiliary regions processed in batches is checked based on the quality evaluation parameters, and local structure optimization is performed on grids that do not meet the requirements until the grid quality meets the calculation requirements.

[0026] Preferably, the transition region is divided into two-dimensional finite element grids, specifically including:

[0027] The arc area in the transition area adopts a second-order right triangle mesh, and the plane area adopts a second-order equilateral triangle mesh, so as to obtain a two-dimensional mesh in the transition area;

[0028] The contour of the transition region two-dimensional grid is consistent with the contour of the transition region of the shell geometry.

[0029] Preferably, reconstructing the two-dimensional grid of the transition area specifically includes:

[0030] Deleting the first layer of grids of the transition area two-dimensional grids close to the target area two-dimensional grids to form a first deletion area;

[0031] regenerate a first layer of transitional grids and a second layer of transitional grids with two layers of increasing grid sizes based on the first deleted area;

[0032] Determine whether the size difference between the second layer transition grid and the second layer grid of the transition area two-dimensional grid is greater than a preset value;

[0033] If yes, then the second layer of grids is deleted to form a second deleted area, and two layers of third layer transition grids and fourth layer transition grids with increasing grid sizes are regenerated in the second deleted area to complete the two-dimensional grid reconstruction of the transition area;

[0034] Otherwise, the second layer of grids is not deleted, and the two-dimensional grid reconstruction of the transition area is completed.

[0035] Preferably, releasing the first association relationship specifically includes:

[0036] The attribute information of the corresponding area on the shell geometric body is assigned to the corresponding area of ​​the shell two-dimensional grid, and the outline of the shell two-dimensional grid is consistent with the outline of the shell geometric body.

[0037] Preferably, obtaining a finite element model of a gearbox housing specifically includes:

[0038] Based on the three-dimensional grid model, the color attribute, the code and the material attribute are assigned to the corresponding area to obtain the gearbox housing finite element model;

[0039] The material properties include: material information, material number, Young's modulus, Poisson's ratio and density information.

[0040] A gearbox housing finite element modeling system, comprising: a model processing module, a region division module, a two-dimensional grid model acquisition module, a grid reconstruction module and a finite element model acquisition module;

[0041] The model processing module is used to obtain the mathematical model of the gearbox housing and perform preprocessing to obtain a fully enclosed housing geometry;

[0042] The region division module is used to divide the shell into a target region, a transition region and an auxiliary region based on the shell geometry, and set attribute information accordingly;

[0043] The two-dimensional mesh model acquisition module is used to perform finite element two-dimensional mesh division based on the target area, the transition area and the auxiliary area to obtain a shell two-dimensional mesh; release the first association relationship between the shell geometric body and the shell two-dimensional mesh and delete the shell geometric body to obtain a two-dimensional mesh model;

[0044] The grid reconstruction module is used to reconstruct the two-dimensional grid of the transition area based on the two-dimensional grid model to generate a new two-dimensional grid model;

[0045] The finite element model acquisition module is used to generate a three-dimensional mesh model based on the two-dimensional mesh model and release the second association relationship, delete the two-dimensional mesh model; and assign the corresponding attribute information based on the three-dimensional mesh model to obtain a finite element model of the gearbox housing.

[0046] It can be seen from the above technical solutions that, compared with the prior art, the present invention discloses a finite element modeling method and system for a gearbox housing, which simplifies the finite element modeling process of the gearbox housing through a modular approach, and adopts a reasonable area division strategy to optimize the mesh quality, thereby achieving fast and efficient simulation analysis, and has the following beneficial effects:

[0047] 1. Improve modeling efficiency: By dividing the gearbox housing into target calculation area, transition area and auxiliary area, and setting corresponding geometric attributes and color attributes for different areas, it can be refined purposefully; unnecessary details are retained, making meshing more efficient and reasonable, and greatly shortening the conversion time from 3D CAD model to finite element model.

[0048] 2. Optimize mesh quality: After dividing each area into two-dimensional meshes, reconstruct the meshes in the transition area to ensure the generation of closed and high-quality two-dimensional meshes. Then create three-dimensional meshes based on these two-dimensional meshes, which not only ensures the consistency and continuity of the mesh, but also avoids irregular or distorted mesh units, thus improving the quality of the overall model.

[0049] 3. Enhanced design flexibility: The modular design concept allows users to quickly adjust the parameter settings of each area according to different needs, and can respond quickly even when the design plan changes, without having to completely redo the entire modeling process; this flexibility greatly promotes the speed of product iterative development.

[0050] 4. The present invention not only improves the convenience and accuracy of finite element modeling of the gearbox housing, but also has important significance for promoting technological innovation and development of related products in the automotive industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0052] Figure 1 A flow chart of a finite element modeling method for a gearbox housing provided by the present invention.

[0053] Figure 2 This is a schematic diagram of target area marking provided by the present invention.

[0054] Figure 3 This is a schematic diagram of the transition area marking provided by the present invention.

[0055] Figure 4 This is a schematic diagram of the auxiliary area marking provided by the present invention.

[0056] Figure 5 This is a flow chart of the method for reconstructing two-dimensional grid in transition area provided by the present invention.

[0057] Figure 6 A schematic structural diagram of a gearbox housing finite element modeling system provided by the present invention. DETAILED DESCRIPTION

[0058] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0059] Example 1

[0060] like Figure 1 As shown, an embodiment of the present invention discloses a finite element modeling method for a gearbox housing, comprising:

[0061] Obtain the mathematical model of the gearbox housing and perform preprocessing to obtain a fully enclosed housing geometry;

[0062] Based on the shell geometry, it is divided into target area, transition area and auxiliary area, and attribute information is set accordingly;

[0063] Based on the target area, transition area and auxiliary area, finite element two-dimensional mesh division is performed respectively to obtain a two-dimensional mesh of the shell;

[0064] The first association relationship between the shell geometry and the shell two-dimensional mesh is released and the shell geometry is deleted to obtain a two-dimensional mesh model;

[0065] Reconstructing the two-dimensional grid of the transition area based on the two-dimensional grid model to generate a new two-dimensional grid model;

[0066] Generate a three-dimensional mesh model based on the two-dimensional mesh model, release the second association relationship, and delete the two-dimensional mesh model;

[0067] Based on the three-dimensional mesh model, the corresponding attribute information is given to obtain the finite element model of the gearbox housing.

[0068] Example 2

[0069] An embodiment of the present invention discloses a finite element modeling method for a gearbox housing, comprising:

[0070] Obtain the mathematical model of the gearbox housing and perform preprocessing to obtain the fully enclosed housing geometry:

[0071] Preferably, the preprocessing is specifically: geometry cleaning

[0072] Geometry cleanup includes: removing small features, filling gaps, fixing topology problems, and smoothing surfaces.

[0073] Based on the shell geometry, it is divided into target area, transition area and auxiliary area, and the attribute information is set accordingly:

[0074] Preferably, the shell geometry is divided into a target area, a transition area and an auxiliary area based on the function and geometric features of the shell, and different attribute information is set for different areas.

[0075] Preferably, the attribute information includes: geometric attributes, color attributes and codes;

[0076] The geometric attributes correspond one-to-one with the color attributes;

[0077] There is a one-to-one correspondence between geometric attributes and codes.

[0078] Preferably, the target area includes a bearing hole area and a suspension installation area, and different geometric attributes, different color attributes and different codes are set respectively;

[0079] like Figure 2 As shown, in this embodiment, the bearing hole 1 and the bearing hole 2 in the target area are set to the geometric attributes coded 10 and 11 respectively, and different color attributes are set; the bearing inner ring geometry is displayed, the geometry around the bearing inner ring is displayed in association, the unassociated geometry is hidden, the displayed geometry is used as the geometry of the target bearing, empty geometric attributes are added, the target bearing geometry is assigned to the geometric attributes, the red attribute is set as the mark for the geometric attribute, and the settings of the remaining bearing target areas are set in the same way.

[0080] Preferably, the transition area includes a bearing seat end surface area and a suspension flange area, which are respectively provided with different geometric properties, different color properties and different codes;

[0081] like Figure 3 As shown, in this embodiment, the transition area is the flange surface connected to the target area, and different color attributes are set for the geometric attributes of different transition areas coded as 20 and 21; the bearing flange surface is displayed, the geometric bodies around the bearing flange surface are associated, the unassociated geometric bodies are hidden, the displayed geometric bodies are used as the geometric bodies of the target transition area, empty geometric attributes are added, the transition flange surface geometry is assigned geometric attributes, and the geometric attributes are set to purple attributes as marks, and the settings of the remaining transition areas are similar.

[0082] Preferably, the auxiliary area includes areas other than the target calculation area and the transition area, and different geometric attributes, different color attributes and different codes are set correspondingly;

[0083] like Figure 4 As shown, in this embodiment, a geometric attribute coded as 30 is set for the auxiliary area, and a different color attribute is set to gray.

[0084] Preferably, each target region is assigned different geometric attributes and different color attributes, in order to distinguish the target regions by color, so as to facilitate subsequent two-dimensional grid division.

[0085] Finite element two-dimensional meshing is performed based on the target area, transition area and auxiliary area to obtain the two-dimensional mesh of the shell:

[0086] Preferably, the target area is mainly the area where the shell is subjected to bearing force and suspension force, and the area where the shell contacts the bearing and suspension. It is the area where strength and durability verification is mainly carried out, and the mesh is refined and strict mesh quality requirements are applied to it.

[0087] Preferably, the target area of ​​this embodiment is divided into a finite element two-dimensional grid with a grid length of 2 mm; a second-order right-angled triangle grid is used on the geometric surface of the bearing hole, and the fillet of the bearing hole is divided into at least two layers of second-order right-angled triangle grids to maintain the geometric contour of the fillet, and the produced two-dimensional grid can correspond one to one in the axial and radial directions; a second-order equilateral triangle grid is used on the plane of the bearing seat, and a smooth transition is made with the arc geometry two-dimensional grid.

[0088] Preferably, the auxiliary area has the largest area and the most complex structure, but this area is not a stress verification area, so two-dimensional grid division is performed through a grid batch processing method.

[0089] Preferably, the auxiliary area is divided into two-dimensional finite element grids, specifically including:

[0090] Write the ANSA_mpar program file to implement all the parameters required for mesh generation, the requirements of various feature processing tools, automatic identification and processing of edges, processing methods of fillet features, chamfer features, and circular hole features, define the storage and association of generated mesh type, mesh order, mesh size, and unit distortion, identification of geometric features, feature filtering, and feature processing methods after filtering, mesh reconstruction methods for tiny geometric features, and perform batch mesh processing to complete the two-dimensional mesh division of the auxiliary area to obtain the two-dimensional mesh of the auxiliary area.

[0091] Preferably, the method further includes performing quality inspection based on the two-dimensional grid of the auxiliary area:

[0092] Write the ANSA_QUAL program file to obtain the quality assessment parameters of the auxiliary area two-dimensional grid: side ratio index, skewness index, Jacobian index, maximum and minimum grid size, maximum and minimum angle index and growth rate index;

[0093] The quality of the auxiliary area two-dimensional meshes processed in batches is checked based on the quality assessment parameters, and local structure optimization is performed on the meshes that do not meet the requirements until the mesh quality meets the calculation requirements.

[0094] Preferably, the transition region is divided into two-dimensional finite element grids, specifically including:

[0095] The arc area in the transition area adopts a second-order right triangle mesh, and the plane area adopts a second-order equilateral triangle mesh, so as to obtain a two-dimensional mesh in the transition area;

[0096] The contour of the 2D mesh in the transition region is consistent with the contour of the transition region of the shell geometry.

[0097] Release the first association between the shell geometry and the shell 2D mesh and delete the shell geometry to obtain a 2D mesh model:

[0098] Preferably, releasing the first association relationship specifically includes:

[0099] The attribute information of the corresponding area on the shell geometric body is assigned to the corresponding area of ​​the shell two-dimensional mesh, and the outline of the shell two-dimensional mesh is consistent with the outline of the shell geometric body.

[0100] Preferably, the corresponding area of ​​the two-dimensional grid of the shell is set to the color of the corresponding shell geometric area, which also plays the role of distinguishing the target area, the transition area and the auxiliary area.

[0101] Reconstruct the two-dimensional mesh of the transition area based on the two-dimensional mesh model to generate a new two-dimensional mesh model:

[0102] Preferably, Figure 5 As shown, the two-dimensional grid of the transition area is reconstructed, including:

[0103] Deleting the first layer of grids of the transition area two-dimensional grid close to the target area two-dimensional grid to form a first deletion area;

[0104] regenerate a first layer transition grid and a second layer transition grid of two layers with increasing grid sizes based on the first deleted area;

[0105] Determine whether the size difference between the second layer transition grid and the second layer grid of the transition area two-dimensional grid is greater than a preset value;

[0106] If so, the second layer of mesh is deleted to form a second deleted area, and a third layer of transition mesh and a fourth layer of transition mesh with two layers of increasing mesh sizes are regenerated in the second deleted area to complete the two-dimensional mesh reconstruction of the transition area;

[0107] Otherwise, the second layer of mesh is not deleted and the 2D mesh reconstruction of the transition area is completed.

[0108] Preferably, the grid in the target area is refined and smaller in size, the grid in the auxiliary area is coarser and larger, and the preprocessed two-dimensional grid in the transition area is irregular, so the two-dimensional grid in the transition area needs to be reconstructed. On the one hand, the grid size can be transitioned from the target area to the auxiliary area. On the other hand, because the transition area is also a stress verification area, a more standardized grid is required.

[0109] Preferably, the first layer of grids of the transition area two-dimensional grid close to the target area two-dimensional grid is deleted, grid filling is performed between two consecutive grids of the first layer of the target area two-dimensional grid and the second layer of grids of the transition area two-dimensional grid facing the positive direction, the filled two-dimensional grid is divided, the size of the filled grid is reduced, the first layer of the transition area forms a closed annular area, the annular area is grid filled, and the first layer of transition grids and the second layer of transition grids are formed;

[0110] Determine whether the size difference between the second layer transition grid and the second layer grid of the transition area two-dimensional grid is greater than a preset value;

[0111] If so, the second layer of the transition area two-dimensional grid close to the target area two-dimensional grid is deleted, and the two grids of the second layer of the transition grid and the third layer of the transition area two-dimensional grid facing the positive direction are grid-filled, and the filled two-dimensional grid is divided to reduce the size of the filled grid, and the second layer of the transition area forms a closed annular area, and the annular area is grid-filled to form a third layer of transition grid and a fourth layer of transition grid;

[0112] Determine whether the size difference between the fourth-layer transition grid and the third-layer grid of the transition area two-dimensional grid or the first-layer grid of the auxiliary area two-dimensional grid is greater than a preset value;

[0113] If yes, continue with the above steps, otherwise do not delete.

[0114] The grid size and quality of the two-dimensional grid in the transition area meet the gradual transition between the two-dimensional grid in the target area and the two-dimensional grid in the auxiliary area. The nodes at the same position are merged to generate common nodes to obtain the final two-dimensional grid model.

[0115] Preferably, the sizes of the first layer transition grid, the second layer transition grid, the third layer transition grid and the fourth layer transition grid are increased in sequence.

[0116] Preferably, in this embodiment, two grids are selected in a smooth area, and the preset value is set to 20%.

[0117] Generate a 3D mesh model based on the 2D mesh model and release the second association relationship, then delete the 2D mesh model:

[0118] Preferably, the attribute information of the corresponding area on the two-dimensional grid model is assigned to the corresponding area of ​​the three-dimensional grid model, and the outline of the three-dimensional grid model is consistent with the outline of the two-dimensional grid model.

[0119] Based on the three-dimensional mesh model, the corresponding attribute information is given to obtain the finite element model of the gearbox housing.

[0120] Preferably, obtaining a finite element model of a gearbox housing specifically includes:

[0121] Based on the three-dimensional mesh model, color attributes, codes and material attributes are assigned to the corresponding areas to obtain a finite element model of the gearbox housing;

[0122] Material properties include: material information, material number, Young's modulus, Poisson's ratio and density information.

[0123] Preferably, in this embodiment, the housing gearbox material is set to aluminum alloy, the material number is set to ADC12, the Young's modulus is set to 210000 MPa, the Poisson's ratio is set to 0.33, the density is set to 2.7x10-9t / mm3, and the material properties are set in the ANSA software.

[0124] Example 3

[0125] like Figure 6 As shown, a finite element modeling system for a gearbox housing includes: a model processing module, a region division module, a two-dimensional grid model acquisition module, a grid reconstruction module and a finite element model acquisition module;

[0126] A model processing module is used to obtain the mathematical model of the gearbox housing and perform preprocessing to obtain a fully enclosed housing geometry;

[0127] The area division module is used to divide the shell into target area, transition area and auxiliary area based on the shell geometry, and set the attribute information accordingly;

[0128] A two-dimensional mesh model acquisition module is used to perform finite element two-dimensional mesh division based on the target area, the transition area and the auxiliary area to obtain a two-dimensional mesh of the shell; release the first association relationship between the shell geometry and the two-dimensional mesh of the shell and delete the shell geometry to obtain a two-dimensional mesh model;

[0129] A mesh reconstruction module, used for reconstructing the two-dimensional mesh of the transition area based on the two-dimensional mesh model to generate a new two-dimensional mesh model;

[0130] The finite element model acquisition module is used to generate a three-dimensional mesh model based on the two-dimensional mesh model and release the second association relationship, delete the two-dimensional mesh model; and assign corresponding attribute information based on the three-dimensional mesh model to obtain a finite element model of the gearbox housing.

[0131] Example 4

[0132] Based on the same inventive concept, the present invention also provides a computer device, including a processor, a communication interface, a memory and a communication bus, wherein the processor, the communication interface and the memory communicate with each other via the communication bus;

[0133] Memory, used to store computer programs;

[0134] The processor, when used to execute the program stored in the memory, can implement a finite element modeling method for a gearbox housing as in Example 1 or 2.

[0135] The electronic device may include: a processor, a communication interface, a memory, and a communication bus, wherein the processor, the communication interface, and the memory communicate with each other via the communication bus. The processor may call logic instructions in the memory to execute a finite element modeling method for a gearbox housing in Embodiment 1 or 2.

[0136] In addition, the logic instructions in the above-mentioned memory can be implemented in the form of software functional units and can be stored in a computer-readable storage medium when sold or used as an independent product. Based on such an understanding, the technical solution of the present invention is essentially or the part that contributes to the prior art or the part of the technical solution can be embodied in the form of a software product, which is stored in a storage medium and includes a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods of various embodiments of the present invention.

[0137] The aforementioned storage media include: U disk, mobile hard disk, read-only memory (ROM), random access memory (RAM), disk or optical disk and other media that can store program codes.

[0138] It can be seen from the above technical solutions that, compared with the prior art, the present invention discloses a finite element modeling method and system for a gearbox housing, which simplifies the finite element modeling process of the gearbox housing through a modular approach, and adopts a reasonable area division strategy to optimize the mesh quality, thereby achieving fast and efficient simulation analysis, and has the following beneficial effects:

[0139] 1. Improve modeling efficiency: By dividing the gearbox housing into target calculation area, transition area and auxiliary area, and setting corresponding geometric attributes and color attributes for different areas, it can be refined purposefully; unnecessary details are retained, making meshing more efficient and reasonable, and greatly shortening the conversion time from 3D CAD model to finite element model.

[0140] 2. Optimize mesh quality: After dividing each area into two-dimensional meshes, reconstruct the meshes in the transition area to ensure the generation of closed and high-quality two-dimensional meshes. Then create three-dimensional meshes based on these two-dimensional meshes, which not only ensures the consistency and continuity of the mesh, but also avoids irregular or distorted mesh units, thus improving the quality of the overall model.

[0141] 3. Enhanced design flexibility: The modular design concept allows users to quickly adjust the parameter settings of each area according to different needs, and can respond quickly even when the design plan changes, without having to completely redo the entire modeling process; this flexibility greatly promotes the speed of product iterative development.

[0142] 4. The present invention not only improves the convenience and accuracy of finite element modeling of the gearbox housing, but also has important significance for promoting technological innovation and development of related products in the automotive industry.

[0143] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0144] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one 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 present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A finite element modeling method for a gearbox housing, characterized in that: include: Obtain the mathematical model of the gearbox housing and perform preprocessing to obtain a fully enclosed housing geometry; Dividing the shell geometry into a target area, a transition area and an auxiliary area, and setting attribute information accordingly; Performing finite element two-dimensional mesh division based on the target area, the transition area and the auxiliary area respectively to obtain a two-dimensional mesh of the shell; releasing the first association relationship between the shell geometric body and the shell two-dimensional mesh and deleting the shell geometric body to obtain a two-dimensional mesh model; Reconstructing the two-dimensional grid of the transition area based on the two-dimensional grid model to generate a new two-dimensional grid model; Generate a three-dimensional mesh model based on the two-dimensional mesh model and release the second association relationship, and delete the two-dimensional mesh model; Based on the three-dimensional mesh model, the corresponding attribute information is assigned to obtain a finite element model of the gearbox housing.

2. A finite element modeling method for a gearbox housing according to claim 1, characterized in that: The preprocessing is specifically as follows: geometry cleaning The geometry cleanup includes: deleting small features, filling gaps, fixing topological problems and smoothing surfaces.

3. The finite element modeling method for a gearbox housing according to claim 1, characterized in that: The attribute information includes: geometric attributes, color attributes and codes; The geometric attributes correspond one to one with the color attributes; The geometric attributes correspond to the codes one by one.

4. The finite element modeling method for a gearbox housing according to claim 1, characterized in that: The auxiliary area is subjected to finite element two-dimensional mesh division, specifically including: Write the ANSA_mpar program file to implement all the parameters required for mesh generation, the requirements of various feature processing tools, automatic identification and processing of edges, processing methods for fillet features, chamfer features, and circular hole features, define the storage and association of generated mesh type, mesh order, mesh size, and unit distortion, identification of geometric features, feature filtering, and feature processing methods after filtering, mesh reconstruction methods for tiny geometric features, and perform batch mesh processing to complete the two-dimensional mesh division of the auxiliary area to obtain a two-dimensional mesh of the auxiliary area.

5. A finite element modeling method for a gearbox housing according to claim 4, characterized in that: The method further includes performing quality inspection based on the two-dimensional grid of the auxiliary area: Writing the ANSA_QUAL program file to obtain the quality assessment parameters of the two-dimensional grid in the auxiliary area: side length ratio index, skewness index, Jacobian index, maximum and minimum grid sizes, maximum and minimum angle indexes, and growth rate index; The quality of the two-dimensional grids of the auxiliary regions processed in batches is checked based on the quality evaluation parameters, and local structure optimization is performed on grids that do not meet the requirements until the grid quality meets the calculation requirements.

6. The finite element modeling method for a gearbox housing according to claim 1, characterized in that: The transition area is subjected to finite element two-dimensional mesh division, specifically including: The arc area in the transition area adopts a second-order right triangle mesh, and the plane area adopts a second-order equilateral triangle mesh, so as to obtain a two-dimensional mesh in the transition area; The contour of the transition region two-dimensional grid is consistent with the contour of the transition region of the shell geometry.

7. A finite element modeling method for a gearbox housing according to claim 6, characterized in that: Reconstructing the two-dimensional grid of the transition area specifically includes: Deleting the first layer of grids of the transition area two-dimensional grids close to the target area two-dimensional grids to form a first deletion area; regenerate a first layer of transitional grids and a second layer of transitional grids with two layers of increasing grid sizes based on the first deleted area; Determine whether the size difference between the second layer transition grid and the second layer grid of the transition area two-dimensional grid is greater than a preset value; If yes, then the second layer of grids is deleted to form a second deleted area, and two layers of third layer transition grids and fourth layer transition grids with increasing grid sizes are regenerated in the second deleted area to complete the two-dimensional grid reconstruction of the transition area; Otherwise, the second layer of grids is not deleted, and the two-dimensional grid reconstruction of the transition area is completed.

8. The finite element modeling method for a gearbox housing according to claim 1, characterized in that: Releasing the first association relationship specifically includes: The attribute information of the corresponding area on the shell geometric body is assigned to the corresponding area of ​​the shell two-dimensional grid, and the outline of the shell two-dimensional grid is consistent with the outline of the shell geometric body.

9. The finite element modeling method for a gearbox housing according to claim 1, characterized in that: The finite element model of the gearbox housing is obtained, including: Based on the three-dimensional grid model, the color attribute, the code and the material attribute are assigned to the corresponding area to obtain the gearbox housing finite element model; The material properties include: material information, material number, Young's modulus, Poisson's ratio and density information.

10. A gearbox housing finite element modeling system, applied to a gearbox housing finite element modeling method as claimed in any one of claims 1 to 9, characterized in that: include: Model processing module, region division module, two-dimensional mesh model acquisition module, mesh reconstruction module and finite element model acquisition module; The model processing module is used to obtain the mathematical model of the gearbox housing and perform preprocessing to obtain a fully enclosed housing geometry; The region division module is used to divide the shell into a target region, a transition region and an auxiliary region based on the shell geometry, and set attribute information accordingly; The two-dimensional mesh model acquisition module is used to perform finite element two-dimensional mesh division based on the target area, the transition area and the auxiliary area to obtain a shell two-dimensional mesh; release the first association relationship between the shell geometric body and the shell two-dimensional mesh and delete the shell geometric body to obtain a two-dimensional mesh model; The grid reconstruction module is used to reconstruct the two-dimensional grid of the transition area based on the two-dimensional grid model to generate a new two-dimensional grid model; The finite element model acquisition module is used to generate a three-dimensional mesh model based on the two-dimensional mesh model and release the second association relationship, delete the two-dimensional mesh model; and assign the corresponding attribute information based on the three-dimensional mesh model to obtain a finite element model of the gearbox housing.

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