CN109657376B - Full-vehicle automatic modeling method for CAE simulation - Google Patents
Full-vehicle automatic modeling method for CAE simulation Download PDFInfo
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- CN109657376B CN109657376B CN201811591128.4A CN201811591128A CN109657376B CN 109657376 B CN109657376 B CN 109657376B CN 201811591128 A CN201811591128 A CN 201811591128A CN 109657376 B CN109657376 B CN 109657376B
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Abstract
The invention relates to a complete vehicle automatic modeling method for CAE simulation, which comprises the following steps: step 1: setting CAD data for modeling the whole vehicle and a corresponding structural BOM file, and importing the BOM file into CAE modeling software; step 2: based on a set structure configuration table, carrying out structure recombination on the BOM file obtained in the step 1 to obtain a recombined BOM file; and 3, step 3: importing geometric data and carrying out mesh division on the geometric data; performing attribute assignment on each part; writing the grid division data and the attribute assigned data into the recombined BOM file; and 4, step 4: generating a connection unit according to the connection information data file; performing system assembly based on the connecting units and the assembly configuration table to form a model; writing the connection unit and the system assembling information into the recombined BOM file; and 5: and (5) checking and adjusting the model obtained in the step (4), performing trial calculation, and completing modeling.
Description
Technical Field
The invention relates to a complete vehicle automatic modeling method for CAE simulation.
Background
In the whole vehicle research and development process, the simulation is very important work, and particularly, in the digital vehicle stage that a physical vehicle has not been manufactured, the simulation analysis is completely carried out by depending on a digital model so as to improve the design. The whole vehicle simulation model is a highly integrated complex system, relates to contents such as grid division, attributes, connection processing and the like, is complex in process and detailed in processing flow, and urgently needs a set of complete whole vehicle automatic modeling method to facilitate whole vehicle design.
Disclosure of Invention
The invention aims to provide a whole vehicle automatic modeling method for CAE simulation, which realizes the automatic modeling of a whole vehicle and is more convenient for the design of the whole vehicle.
The technical scheme for realizing the purpose of the invention is as follows:
a whole vehicle automatic modeling method for CAE simulation is characterized by comprising the following steps:
step 1: setting CAD data for modeling the whole vehicle and a corresponding structural BOM file, and importing the BOM file into CAE modeling software;
and 2, step: based on a set structure configuration table, carrying out structure recombination on the BOM file obtained in the step 1 to obtain a recombined BOM file;
and step 3: importing geometric data and carrying out mesh division on the geometric data; performing attribute assignment on each part; writing the grid division data and the attribute assigned data into the recombined BOM file;
and 4, step 4: generating a connection unit according to the connection information data file; performing system assembly based on the connecting units and the assembly configuration table to form a model; writing the connection unit and the system assembling information into the recombined BOM file;
and 5: and (5) checking and adjusting the model obtained in the step (4), performing trial calculation, and completing modeling.
Further, in step 1, for the imported BOM file, COG data of the part in the BOM file is calculated, and COG data information is written into the BOM file.
Further, in step 3, the geometric data is subjected to mesh division according to the mesh size specification and the quality standard information.
Further, in step 3, based on the material information and the sheet metal thickness information used by each part in the BOM file, a material library is called to generate an attribute card, and attribute assignment is performed on each part.
Further, in step 4, the connection unit includes a welding point connection unit, a welding seam connection unit, a glue connection unit, and a bolt connection unit.
Further, the bolting unit is generated from the COG data information.
The invention has the following beneficial effects:
the invention can conveniently realize the automatic modeling of the whole vehicle and is more convenient for the design of the whole vehicle. The invention organizes the model through the BOM file, all information is recorded in the BOM, the information has uniqueness, and the BOM file is convenient to transfer; the BOM structure can be adjusted according to the needs by realizing the recombination of the BOM structure through the configuration file, and the use is convenient and flexible; through the recombined BOM structure, the assembled models at all levels are managed, and the structure is clear; the grid specification and the quality requirement can be adjusted through the configuration file, so that grid division is automatically realized and the quality requirement is met; connection processing between models can be automatically realized based on the assembly files, and the assembly files are adjustable; attribute assignment can be automatically carried out on each part; under the condition that the input is accordant, a user can directly obtain the assembled model, and under the condition that the input is defective, the operation can be performed step by step, so that the method is flexible and efficient.
Drawings
FIG. 1 is a schematic diagram of automatic modeling of a whole vehicle;
FIG. 2 is a schematic view of the structural reorganization;
FIG. 3 is a schematic diagram of grid batch processing;
FIG. 4 is a schematic diagram of material/attribute assignments;
fig. 5 is a schematic view of connection and assembly.
Detailed Description
As shown in fig. 1, a method for automatic modeling of a whole vehicle for CAE simulation is characterized by comprising the following steps:
step 1: setting CAD (Computer Aided Design) data for modeling the whole vehicle and a corresponding BOM (Bill of Material) file of a structure, and importing the BOM file into CAE (Computer Aided engineering) modeling software; a common format for BOM files is the XML format.
In step 1, for the imported BOM file, the COG (Center of Gravity) data of the part in the BOM file is calculated, and the COG data information is written into the BOM file.
Step 2: as shown in fig. 2, based on the set structure configuration table, the structure of the BOM file obtained in step 1 is reorganized to obtain a reorganized BOM file for subsequent calling.
In step 2, the structure configuration table establishes the mapping relation between the user structure and the original structure of the system according to the user requirement.
And 3, step 3: importing geometric data to enable each geometric data to be matched and corresponding to a BOM row, constructing a complete finished automobile CAD model, and meshing the geometric data; performing attribute assignment on each part; and writing the grid division data and the attribute assigned data into the recombined BOM file.
In step 3, as shown in fig. 3, according to the mesh size specification and the quality standard information, the geometric data is subjected to mesh division to generate a mesh meeting the quality requirement, and mesh file information is written into the BOM, so that the mesh file is directly loaded through the BOM.
In step 3, as shown in fig. 4, based on the material information and the sheet metal thickness information used by each part in the BOM file, a material library is called to generate an attribute card, and attribute assignment is performed on each part.
And 4, step 4: as shown in fig. 5, a connection unit is generated based on the connection information data file; performing system assembly based on the connecting units and the assembly configuration table to form models, such as a four-door two-cover system, a vehicle body system and the like; and writing the connection unit and the system assembling information into the recombined BOM file.
In step 4, the connecting unit comprises a welding spot connecting unit, a welding seam connecting unit, an adhesive connecting unit and a bolt connecting unit. Generating a welding spot model according to the BOM and the welding spot connection file; generating a welding seam model according to the BOM and the welding seam connection file; according to the BOM and the glue connection file, forming a glue model; the bolt connection unit (bolt model) is generated from the COG data information. The assembly configuration table defines the connection relation among the subsystems, and the subsystems need to be connected.
And 5: and (4) checking and adjusting the model obtained in the step (4), performing trial calculation, and completing modeling.
And step 5, the user acquires the generated model, checks and repairs the model in the local environment software of the user, performs trial calculation, and delivers the checked model to different engineers for use.
In the modeling process, the two steps of material/attribute assignment, connection and assembly can be separated into independent operation steps, and the sequence can be adjusted; before the grid division, the geometric data can be manually checked and processed, so that the quality of the geometric data meets the requirement; after the grid processing is finished, manual intervention can be directly carried out, and parts which cannot generate grids correctly are repaired, so that the grid quality meets the requirements; the matching of the material name in the BOM and the material database can be independently checked, and if the material database does not have completely matched materials, manual matching and repairing are needed; before generating the connection of welding points and the like, the welding point file can be checked to confirm the correctness.
Claims (6)
1. A full-vehicle automatic modeling method for CAE simulation is characterized by comprising the following steps:
step 1: setting CAD data used for modeling the whole vehicle and a corresponding structural BOM file, and importing the BOM file into CAE modeling software;
step 2: based on a set structure configuration table, carrying out structure recombination on the BOM file obtained in the step 1 to obtain a recombined BOM file;
and step 3: importing geometric data and carrying out mesh division on the geometric data; carrying out attribute assignment on each part; writing the grid division data and the attribute assigned data into the recombined BOM file;
and 4, step 4: generating a connection unit according to the connection information data file; performing system assembly based on the connecting units and the assembly configuration table to form a model; writing the connection unit and the system assembling information into the recombined BOM file;
and 5: and (4) checking and adjusting the model obtained in the step (4), performing trial calculation, and completing modeling.
2. The full vehicle automatic modeling method for CAE simulation according to claim 1, characterized in that: in the step 1, COG data of parts in the BOM file are calculated aiming at the imported BOM file, and COG data information is written into the BOM file.
3. The full vehicle automatic modeling method for CAE simulation according to claim 2, characterized in that: and 3, carrying out mesh division on the geometric data according to the mesh size specification and the quality standard information.
4. The full vehicle automated modeling method for CAE simulation of claim 3, characterized in that: and 3, calling a material library based on the material information and the sheet metal thickness information of each part in the BOM file, generating an attribute card, and assigning the attribute of each part.
5. The full vehicle automatic modeling method for CAE simulation according to claim 4, characterized in that: in step 4, the connecting unit comprises a welding spot connecting unit, a welding seam connecting unit, an adhesive connecting unit and a bolt connecting unit.
6. The full vehicle automatic modeling method for CAE simulation according to claim 5, characterized in that: the bolt connection unit is generated according to the COG data information.
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| CN110765639B (en) * | 2019-11-05 | 2023-08-04 | 国网重庆市电力公司电力科学研究院 | Electrical simulation modeling method and device and readable storage medium |
| CN112699457B (en) * | 2020-12-28 | 2022-08-30 | 东风汽车集团有限公司 | Automatic simulation analysis method for automobile body-in-white strength |
| CN113656888B (en) * | 2021-07-29 | 2024-09-03 | 东风柳州汽车有限公司 | Automatic modeling method, device, equipment and storage medium for opening and closing part |
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| KR20100020822A (en) * | 2008-08-13 | 2010-02-23 | 포항공과대학교 산학협력단 | Cad/cae system for designing and analyzing the ubiquitous system and the design and analysis method for ubiquitous system |
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| CN103870623A (en) * | 2012-12-18 | 2014-06-18 | 南车青岛四方机车车辆股份有限公司 | Preprocessing template for vehicle model |
| CN106649444A (en) * | 2016-09-19 | 2017-05-10 | 奇瑞汽车股份有限公司 | Method of CAE data base to obtain CAD data and device of obtaining CAD data |
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