Quick layout method and system for bending beam in vehicle body simulation model

Abstract

The application provides a quick layout method and system for a bent beam in a vehicle body simulation model, which comprises the following steps: selecting a geometric model of a vehicle body, and performing geometric processing on a roof bent beam in the model; performing mesh division on an outer cover plate and the bent beam after geometric cleaning; establishing a spot welding unit between the bent beam and the outer cover plate according to a welding drawing; selecting nodes generated by the bent beam and the same side according to the geometric arrangement of the roof bent beam; selecting the bent beam mesh or the spot welding unit, and sequentially selecting the corresponding nodes of the bent beam to batch generate the bent beam or the connecting welding spot arranged.

Description

Technical Field

[0001] This invention belongs to the field of vehicle body simulation technology, specifically relating to a method and system for rapid layout of curved beams in a vehicle body simulation model. Background Technology

[0002] The statements in this section are merely background information related to the present invention and do not necessarily constitute prior art.

[0003] Stainless steel offers advantages such as good machinability, high waste utilization, and recyclability, while aluminum alloys offer advantages such as good flatness and ease of manufacturing complex car bodies. Therefore, both materials are widely used in the rail vehicle industry both domestically and internationally. However, compared to aluminum alloy car bodies, stainless steel car bodies possess higher rigidity, mechanical and safety performance, and also offer advantages such as high strength, light weight, corrosion resistance, no need for painting, and low life-cycle costs. Consequently, stainless steel car bodies are used more extensively in rail vehicles.

[0004] During the design of the train body structure, if the strength and stiffness of the structure do not meet the requirements of relevant standards, the normal operation of the train cannot be guaranteed, and it may even endanger the lives of passengers. Therefore, ensuring the strength and stiffness of the train body structure is a prerequisite for structural design. In the strength verification of high-speed train bodies, finite element simulation is an important means of product verification during the design phase. Finite element modeling of the train body is the foundation of finite element simulation and also the most time-consuming and labor-intensive step. Timely verification during the design phase increases the requirements for simulation time. However, due to the weak dispersion and regularity of stainless steel train body structures, modeling time is particularly time-consuming.

[0005] Stainless steel vehicle bodies are thin-walled cylindrical integral load-bearing structures composed of a chassis, side walls, end walls, and roof. The structural forms and materials of the vehicle's beams are diverse, and the beams are connected using spot welding and intermittent welding methods, making finite element modeling of the entire vehicle time-consuming and labor-intensive. For example, the roof structure of a stainless steel vehicle body typically uses a structure where an outer cover plate is spot-welded to curved beams, and the spacing between these curved beams varies and their number is considerable. If each group of curved beams is manually modeled, multiple operations such as copying, moving curved beams, and spot welding units are required, which cannot effectively improve the efficiency of simulation modeling or reduce model errors caused by human error.

[0006] Therefore, current finite element simulation mainly focuses on modeling the entire vehicle structure during the modeling process, and there is no solution for quickly modeling the curved beams in the stainless steel vehicle body model. Summary of the Invention

[0007] To address the aforementioned problems, this invention proposes a rapid layout method for curved beams in vehicle body simulation models. This invention effectively saves the tedious manual movement and copying process, greatly improves the efficiency of simulation modeling, and reduces model errors caused by human mistakes.

[0008] According to some embodiments, the present invention adopts the following technical solution:

[0009] Firstly, a rapid layout method for curved beams based on a vehicle body simulation model is disclosed, including:

[0010] Select the geometric model of the vehicle body, and then perform geometric processing on the roof beam within that model;

[0011] After geometric cleanup, mesh the outer cover plate and curved beam;

[0012] Establish the spot welding unit between the curved beam and the outer cover plate according to the welding drawings;

[0013] Based on the geometric layout of the curved beam on the roof, select the same side of the curved beam to generate nodes;

[0014] Select the curved beam mesh or spot welding unit, and then select the corresponding nodes of the curved beam in sequence to generate the array of curved beams or connecting weld points in batches.

[0015] As a further technical solution, the model performs geometric processing on the curved beam of the roof, specifically including selecting a curved beam of the roof for geometric mid-surface extraction, and then performing mesh generation after geometric cleanup.

[0016] As a further technical solution, when selecting the nodes corresponding to the curved beams in sequence, the first node is selected starting from the location of the curved beam, and the nodes on other curved beams are selected in an orderly manner.

[0017] Secondly, a rapid bending beam layout system based on a vehicle body simulation model is disclosed, including:

[0018] The curved beam geometry processing module is configured to: select the geometric model of the vehicle body and perform geometric processing on the curved beam of the roof in the model;

[0019] The mesh generation module is configured to: perform mesh generation on the outer cover plate and curved beam after geometry cleanup;

[0020] The spot welding unit creation module is configured to create spot welding units between the curved beam and the outer cover plate based on the welding drawings.

[0021] The node generation module is configured to generate nodes on the same side of the curved beam according to the geometric layout of the curved beam on the roof.

[0022] The batch generation module is configured to: select curved beam mesh or spot welding unit, select the corresponding node of the curved beam in sequence, and generate the array of curved beams or connecting weld points in batches.

[0023] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0024] (1) The technical solution of the present invention can complete the batch operation of the model by directly calling the tcl script during the modeling process. The operation is simple, convenient and fast.

[0025] (2) The script of the technical solution of the present invention has a prompt box during use, which prompts the complete usage process and the process is simple and easy to understand.

[0026] (3) The technical solution of the present invention saves more than 90% of the time compared with the manual operation of basic functions in the software to model and implement. At the same time, it can realize the array of stainless steel vehicle body curved beam mesh and weld connector, saving the tedious manual steps.

[0027] (4) The technical solution of the present invention can be used for repetitive and numerous grid movements and similar weld point layouts in other locations of the vehicle body.

[0028] Advantages of additional aspects of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

[0029] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0030] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0031] Figure 1 This is a schematic diagram of the stainless steel vehicle body assembly structure according to an embodiment of the present invention;

[0032] Figure 2 This is a schematic diagram of the stainless steel vehicle body roof structure according to an embodiment of the present invention;

[0033] Figure 3 This is a schematic diagram of the stainless steel vehicle body undercarriage structure according to an embodiment of the present invention;

[0034] Figure 4 This is a schematic diagram of the stainless steel vehicle body end wall structure according to an embodiment of the present invention;

[0035] Figure 5 This is a schematic diagram of the stainless steel vehicle body sidewall structure according to an embodiment of the present invention;

[0036] Figure 6 This is a schematic diagram of the sub-array layout process in an embodiment of the present invention. Detailed implementation method:

[0037] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0038] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0039] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0040] Example 1:

[0041] In this embodiment, rapid modeling of a curved beam is used as an example, but this does not mean that the method provided by the present invention is only applicable to rapid modeling of curved beams. It can also be applied to the construction of other models depending on the modeling scenario or the modeling object.

[0042] Specifically, in this embodiment, in order to save time as much as possible, simplify tedious procedures, and especially relieve the fatigue of technicians from repetitive mechanical operations, a method for the mesh and welding points of the curved beam is proposed, thereby removing some repetitive and tedious steps from the stainless steel car body.

[0043] See appendix Figure 6 As shown, in this embodiment, the method for rapid layout of curved beams based on the vehicle body simulation model includes:

[0044] (1) Establishment of the basic model of the roof curved beam: Open the geometric model of the vehicle body in Hypermesh software, select a curved beam on the roof for geometric mid-surface extraction, and perform mesh generation after geometric cleanup;

[0045] Specifically, a curved beam on the roof is selected. Since the curved beam is a thin shell structure, shell elements are required for simulation. To ensure accurate mesh generation of the shell elements, mid-surface extraction and geometric cleanup of the structure are necessary first.

[0046] In one implementation example, the mid-surface of the curved beam is extracted using Geom—midsurface—solids in the Hypermesh software menu panel. After the mid-surface is extracted, the newly generated mid-surface is geometrically cleaned using Geom—quick edit in the Hypermesh software menu panel to avoid problems such as duplicate or missing faces. The cleaned mid-surface structure is then selected for shell element meshing using 2D—automesh-surfs in the Hypermesh software menu panel, and the element mesh size and element type are set at the elementsize and mesh type positions.

[0047] The method for establishing the foundation model of the outer cover plate is the same as that for the curved beam.

[0048] (2) Spot welding connector creation: After completing the mesh division of the outer cover plate and the curved beam, create the spot welding unit connector between the curved beam and the outer cover plate according to the welding drawings;

[0049] Spot welding connector creation: After completing the mesh division of the outer cover plate and the curved beam, according to the spot welding position based on the welding drawing, select the corresponding spot welding position node through 1D—connectors-spot-nodes in the Hypermesh software menu panel to create the spot welding unit connector between the curved beam and the outer cover plate, and set the spot welding unit type in the type.

[0050] (3) Construction of node points at the curved beam location: According to the geometric layout of the curved beam on the roof, generate nodes by selecting the same side of the curved beam through Geom—nodes—extract on line in the Hypermesh software menu panel;

[0051] Node construction for curved beam locations: Using the Hypermesh software menu panel, select Geom—nodes—extract online to generate nodes at the same location on the same side of all roof curved beams. Each curved beam node serves as the reference node for subsequent script execution, ensuring that the meshes generated in batches are aligned with the curved beam geometry model.

[0052] (4) Run the .tcl script: Call the translate_elem.tcl / translate_connector.tcl script via file-run-tcl / tk script, select the curved beam mesh or weld connector to be arranged according to the prompts, and then select the nodes in sequence (note that you should start from this curved beam position to select the first node, and select the nodes on other curved beams in an orderly manner). After clicking OK, the arrangement can be completed quickly.

[0053] Run the .tcl script: Use file-run-tcl / tk script to call the translate_elem.tcl / translate_connector.tcl script. After the script runs correctly, first select the curved beam mesh or weld connector to be arranged in the first and second steps above. Then, select each node created in the third step above in sequence (note that you should start by selecting the first node from the curved beam position where the mesh was divided in the first step above, and select the nodes on other curved beams in an orderly manner). After clicking OK, the arrangement will be completed quickly, achieving the effect of no misalignment between each curved beam mesh and each curved beam geometry, and the purpose of correct spot welding connection between each curved beam structure and the outer cover plate.

[0054] See the appendix for details. Figure 1-5 As shown.

[0055] Example 2:

[0056] Based on the method of Embodiment 1, a rapid layout system for curved beams in a vehicle body simulation model is disclosed, including:

[0057] The curved beam geometry processing module is configured to: select the geometric model of the vehicle body and perform geometric processing on the curved beam of the roof in the model;

[0058] The mesh generation module is configured to: perform mesh generation on the outer cover plate and curved beam after geometry cleanup;

[0059] The spot welding unit creation module is configured to create spot welding units between the curved beam and the outer cover plate based on the welding drawings.

[0060] The node generation module is configured to generate nodes on the same side of the curved beam according to the geometric layout of the curved beam on the roof.

[0061] The batch generation module is configured to: select curved beam mesh or spot welding unit, select the corresponding node of the curved beam in sequence, and generate the array of curved beams or connecting weld points in batches.

[0062] Example 3

[0063] The purpose of this embodiment is to provide a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the steps of the above-described method.

[0064] Example 4

[0065] The purpose of this embodiment is to provide a computer-readable storage medium.

[0066] A computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, performs the steps of the above method.

[0067] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

[0068] While the specific embodiments of the present invention have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without creative effort based on the technical solutions of the present invention are still within the scope of protection of the present invention.

Claims

1. A rapid layout method for curved beams in a vehicle body simulation model, characterized by: include: Select the geometric model of the vehicle body, and then perform geometric processing on the roof beam within that model; In this model, the curved beam on the roof is geometrically processed, specifically including selecting a curved beam on the roof, extracting the geometric mid-surface, and then meshing it after geometric cleanup; After geometric cleanup, mesh the outer cover plate and curved beam; Establish the spot welding unit between the curved beam and the outer cover plate according to the welding drawings; Based on the geometric layout of the curved beam on the roof, select the same side of the curved beam to generate nodes; Select the curved beam mesh or spot welding unit, and then select the corresponding nodes of the curved beam in sequence to generate the array of curved beams or connecting weld points in batches.

2. The rapid layout method for curved beams based on a vehicle body simulation model as described in claim 1, characterized in that, When selecting nodes corresponding to curved beams in sequence, start by selecting the first node at the location of the curved beam, and then select the nodes on other curved beams in an orderly manner.

3. The rapid layout method for curved beams in a vehicle body simulation model as described in claim 1, characterized in that, When selecting the geometric model of the vehicle body, since the curved beam is a thin shell structure, shell elements are used for simulation.

4. The rapid layout method for curved beams in a vehicle body simulation model as described in claim 1, characterized in that, Based on the welding drawings, establish the spot welding unit between the curved beam and the outer cover plate, specifically as follows: After completing the mesh division of the outer cover plate and the curved beam, select the corresponding nodes for spot welding according to the spot welding positions on the welding drawings, establish the spot welding unit between the curved beam and the outer cover plate, and set the spot welding unit type.

5. A rapid bending beam layout system based on a vehicle body simulation model, characterized by: include: The curved beam geometry processing module is configured to: select the geometric model of the vehicle body and perform geometric processing on the curved beam of the roof in the model; In this model, the curved beam on the roof is geometrically processed, specifically including selecting a curved beam on the roof, extracting the geometric mid-surface, and then meshing it after geometric cleanup; The mesh generation module is configured to: perform mesh generation on the outer cover plate and curved beam after geometry cleanup; The spot welding unit creation module is configured to create spot welding units between the curved beam and the outer cover plate based on the welding drawings. The node generation module is configured to generate nodes on the same side of the curved beam according to the geometric layout of the curved beam on the roof. The batch generation module is configured to: select curved beam mesh or spot welding unit, select the corresponding node of the curved beam in sequence, and generate the array of curved beams or connecting weld points in batches.

6. The rapid layout system for curved beams based on a vehicle body simulation model as described in claim 5, characterized in that, When selecting nodes corresponding to curved beams in sequence, start by selecting the first node at the location of the curved beam, and then select the nodes on other curved beams in an orderly manner.

7. A computer device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the program, it implements the steps of the method described in any one of claims 1-4.

8. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the program is executed by the processor, it performs the steps of the method described in any of claims 1-4 above.

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