TWI812473B - Adaptive grid generating method and adaptive grid generating system - Google Patents

Abstract

An adaptive grid generating method includes obtaining a first three-dimensional grid of a target structure; importing the first three-dimensional grid into a computer-aided engineering software to obtain a first two-dimensional planar grid; importing the first two-dimensional planar grid into a grid cleaning software to obtain a second two-dimensional planar grid; and importing the second two-dimensional planar grid into the computer-aided engineering software to obtain a second three-dimensional planar grid.

Description

Adaptive grid generation method and adaptive grid generation system

The invention relates to an adaptive grid generation method and an adaptive grid generation system, and in particular to an adaptive grid generation method and an adaptive grid generation system for grid cleaning and repair.

The rapid development of computer systems has provided powerful tools for engineering analysis, so engineers can use numerical simulation methods to simulate actual problems encountered in the structure of products. For example, when designing the structure of a product, the finite element structural analysis software ABAQUS is used to analyze the grid model of the structure. However, when the structure of the product is very complex, the amount of information required when ABAQUS analyzes the grid model of the structure is too large. Under this situation, how to appropriately simplify the structure of the product and then analyze the grid model of the structure with ABAQUS to take into account both efficiency and quality has become the goal of the industry.

One of the main objectives of the present invention is to provide an adaptive grid generation method and an adaptive grid generation system to solve the above problems.

The invention provides an adaptive mesh generation method, which includes obtaining a first three-dimensional mesh of a target structure; importing the first three-dimensional mesh into a computer-aided engineering software to obtain a first and second a two-dimensional surface mesh; importing the first two-dimensional surface mesh into a mesh cleaning software to obtain a second two-dimensional surface mesh; and importing the second two-dimensional surface mesh into the computer-aided engineering software , to obtain a second three-dimensional grid.

The present invention provides an adaptive grid generation system, which includes a processor; and a memory for storing a program code that instructs the processor to execute an adaptive grid generation method. The adaptive grid generation method The method includes obtaining a first three-dimensional mesh of a target structure; importing the first three-dimensional mesh into a computer-aided engineering software to obtain a first two-dimensional surface mesh; converting the first two-dimensional surface mesh Importing a mesh cleaning software to obtain a second two-dimensional surface mesh; and importing the second two-dimensional surface mesh into the computer-aided engineering software to obtain a second three-dimensional mesh.

1: Structural strength analysis system

2,3:Process

10: Processor

20:Memory

S200,S202,S204,S206,S208,S210,S300,S302,S304: Steps

Figure 1 is a schematic diagram of an adaptive grid generation system according to an embodiment of the present invention.

Figure 2 is a schematic diagram of the flow of an adaptive grid generation method according to an embodiment of the present invention.

Figure 3 is a schematic diagram of a grid model according to an embodiment of the present invention.

Figure 4 is a schematic diagram of a grid model according to another embodiment of the present invention.

Figure 5 is a schematic diagram of the second three-dimensional grid according to the embodiment of the present invention.

Figure 6 is a schematic diagram of a mesh cleaning method according to an embodiment of the present invention.

Certain words are used in the description and subsequent patent claims to refer to specific components. It will be understood by those with ordinary knowledge in the art that hardware manufacturers may use different terms to refer to the same component. The scope of this specification and subsequent patent applications does not depend on the difference in name. The way to distinguish components is to use the functional differences of components as the criterion for differentiation. The "include" mentioned throughout the specification and subsequent patent claims is an open-ended term, and therefore should be interpreted as "include but not limited to". In addition, the word "coupling" here includes any direct and indirect means of electrical connection. Therefore, if a first device is coupled to a second device, it means that the first device can be directly electrically connected to the second device, or indirectly electrically connected to the second device through other devices or connections.

Please refer to Figure 1 , which is a schematic diagram of an adaptive grid generation system 1 according to an embodiment of the present invention. The adaptive grid generation system 1 includes a processor 10 and a memory 20 coupled to each other. The memory 20 is used to store a program code. The program code instructs the processor 10 to execute an adaptive grid generation method for Simplify the grid model of a product structure to quickly analyze the product structure while taking into account the quality of the analysis results. It should be noted that the adaptive grid generation system 1 only represents the necessary components required to implement the adaptive grid generation method. Its basic structure is well known in the art, so it will not be described in detail. Those with ordinary knowledge in the art can make the calculation based on the required information. If necessary, other components may be appropriately added, such as motherboard, power supply, connecting cables, input devices, etc., but not limited to these, or the adaptive grid generation system 1 may be implemented with appropriate devices or equipment.

The adaptive grid generation method performed by the adaptive grid generation system 1 can be summarized as a process 2, as shown in Figure 2. Process 2 includes the following steps:

Step S200: Start.

Step S202: Obtain a first three-dimensional mesh of a target structure.

Step S204: Import the first three-dimensional mesh into a computer-aided engineering software to obtain a first two-dimensional surface mesh.

Step S206: Import the first two-dimensional surface mesh into a mesh cleaning software to obtain a second two-dimensional surface mesh.

Step S208: Import the second two-dimensional surface mesh into the computer-aided engineering software to obtain a second three-dimensional mesh.

Step S210: end.

According to the process 2, in step S202, the adaptive grid generation system 1 exports the first three-dimensional grid of the target structure through a drawing software. For example, please refer to Figure 3, the first three-dimensional grid can be generated by Cero CAD software. An IDX format file exported, but not limited to this. In step S204, the adaptive mesh generation system 1 imports the first three-dimensional mesh into a computer-aided engineering software to obtain the first two-dimensional surface mesh. For example, the computer-aided engineering software can be a finite element structural analysis software ABAQUS. By selecting the 2D Planar mode in ABAQUS, the first three-dimensional mesh can be converted and exported into a first two-dimensional surface in STL format (*.stl). The basic conversion process of the grid is well known in the art, so it will not be described in detail.

In step S206, the adaptive mesh generation system 1 imports the first two-dimensional surface mesh into the mesh cleaning software and executes a mesh cleaning method to perform mesh cleaning on the first two-dimensional surface mesh. In this way Then, the first two-dimensional surface mesh can be simplified into the second two-dimensional surface mesh. For example, the mesh cleaning software can be the Python-based PyMesh suite. The PyMesh suite is a rapid prototyping platform for geometry processing, and its main application area is three-dimensional printing. In short, the adaptive mesh generation system 1 uses the mesh cleaning method in the PyMesh suite to clean the first two-dimensional surface mesh and obtain the second two-dimensional surface mesh in STL format.

Specifically, after the above steps, compared with the first two-dimensional surface grid, the second two-dimensional surface grid removes the parts that can be simplified. Therefore, in step S208, the adaptive grid generation system 1 can The second two-dimensional surface mesh was imported into the computer-aided engineering software ABAQUS to obtain the second three-dimensional mesh. In this way, the computer-aided engineering software ABAQUS can analyze the target structure based on the second three-dimensional grid. It adopts a structured grid model and takes into account both analysis efficiency and analysis quality.

For example, the target structure may be a C component of a laptop computer. Please refer to Figures 3, 4 and 5. It should be noted that since the structure of Part C is very complex, Figures 3 and 4 capture different parts of Part C for illustration. Specifically, Figures 3a and 4a are schematic diagrams of the first three-dimensional grid of Part C according to the embodiment of the present invention. The first three-dimensional grid will present a plurality of smaller grids corresponding to the more complex structure of Part C. (For example, multiple grids marked with bold lines). Figures 3b and 4b are schematic diagrams of the first two-dimensional surface grid. The adaptive grid generation system 1 converts the first three-dimensional grid into a first two-dimensional surface grid, where the first two-dimensional surface grid corresponds to C The more complex structures of the piece are also marked with bold lines. Figures 3c and 4c are schematic diagrams of the second two-dimensional surface grid. The adaptive grid generation system 1 performs grid cleaning on the first two-dimensional surface grid to obtain the second two-dimensional surface grid. As shown in Figures 3c and 4c, the areas corresponding to the bold lines in Figures 3b and 4b have been cleaned up and simplified. Figure 3d and Figure 4d are schematic diagrams of the second three-dimensional grid. The adaptive grid generation system 1 converts the second two-dimensional surface grid into a second three-dimensional grid. As shown in Figure 3d and Figure 4d, compared with the first three-dimensional grid, the second three-dimensional grid has removed parts that can be simplified. Further, as shown in Figure 5, which is the second three-dimensional grid corresponding to the complete C part, the computer-aided engineering software ABAQUS can analyze the grid model of C part based on the second three-dimensional grid and take into account the analysis efficiency. and analytical quality.

In another embodiment, the mesh cleaning method performed by the adaptive mesh generation system 1 can be summarized as a process 3, as shown in Figure 6. Process 3 includes the following steps:

Step S300: According to the first two-dimensional surface mesh and a mesh cleaning coefficient, perform a mesh cleaning method to obtain an approximate two-dimensional surface mesh.

Step S302: Compare a volume change rate of the first two-dimensional surface grid and the approximate two-dimensional surface grid to adjust the grid cleaning coefficient.

Step S303: Input the approximate two-dimensional surface grid as the second two-dimensional surface grid.

In step S300, the adaptive mesh generation system 1 may set a mesh cleaning coefficient, and perform a mesh cleaning method on the first two-dimensional surface mesh according to the mesh cleaning coefficient to obtain an approximate two-dimensional surface mesh. In step S302, the adaptive grid generation system 1 compares the volume change rate of the first two-dimensional surface grid and the approximate two-dimensional surface grid. When an area of the first two-dimensional surface grid and the approximate two-dimensional surface grid When the change rate is greater than a predetermined change rate, adjust the mesh cleaning coefficient of the mesh cleaning method, and execute process 3 again. When the area change rate between the first two-dimensional surface grid and the approximate two-dimensional surface grid is less than or equal to the predetermined change rate, the approximate two-dimensional surface grid is input as the second two-dimensional surface grid. For example, the adaptive mesh generation system 1 sets a predetermined change rate of 3%. When the volume change rate is greater than 3%, the mesh cleaning coefficient is adjusted and process 3 is executed again. When the volume change rate is less than 3%, the approximate two-dimensional surface grid is input as the second two-dimensional surface grid.

It should be noted that the adaptive grid generation system 1 is an embodiment of the present invention. Those of ordinary skill in the art can combine, modify or change the above-described embodiments according to the spirit of the present invention, but are not limited thereto. . All the above instructions, steps, and/or processes (including recommended steps) can be achieved through hardware, software, and firmware (that is, the combination of hardware devices and computer instructions, and the data in the hardware devices are read-only software data), Electronic system, or a combination of the above devices. Hardware can include analog, digital, and hybrid circuits (i.e., microcircuits, microchips, or silicon chips). Electronic systems may include system on chip (SoC), system in package (SiP), computer on module (CoM) and adaptive grid generation system 1 . The process steps and embodiments of the present invention may exist in the form of program codes or instructions and be stored in the memory 20 . The memory 20 can be a computer-readable recording medium, and the memory 20 can include read-only memory (ROM), flash memory (Flash Memory), random-access memory (random-access memory, RAM), Subscriber Identity Module (SIM), hard disk, CD-ROM/DVD-ROM/ BD-ROM), but not limited to this. The above-mentioned processes and embodiments can be compiled into program codes or instructions and stored in the memory 20 . The processor 10 can be used to read and execute the program codes or instructions stored in the memory 20 to implement all the aforementioned steps and functions.

In summary, compared with traditional technology, the adaptive mesh generation system of the present invention can use mesh cleaning software to clean the mesh model of the target structure, and then import it into computer-aided engineering software to analyze the target structure, which can reduce the number of analysis software A large number of calculations and taking into account the accuracy of analysis.

The above are only preferred embodiments of the present invention, and all equivalent changes and modifications made in accordance with the patentable scope of the present invention shall fall within the scope of the present invention.

2: Process

S200, S202, S204, S206, S208, S210: steps

Claims (6)

An adaptive mesh generation method includes: (a) obtaining a first three-dimensional mesh of a target structure; (b) importing the first three-dimensional mesh into a computer-aided engineering software to obtain a first or second three-dimensional surface mesh; (c) import the first two-dimensional surface mesh into a mesh cleaning software to obtain a second two-dimensional surface mesh; and (d) import the second two-dimensional surface mesh Enter the computer-aided engineering software to obtain a second three-dimensional mesh; wherein step (c) includes: performing a mesh cleaning method according to the first two-dimensional surface mesh to obtain an approximate two-dimensional surface mesh; When an area change rate between the first two-dimensional surface grid and the approximate two-dimensional surface grid is greater than a predetermined change rate, adjust a grid cleaning coefficient of the grid cleaning method, and perform step (c) again; And when the area change rate between the first two-dimensional surface grid and the approximate two-dimensional surface grid is less than or equal to the predetermined change rate, the approximate two-dimensional surface grid is input as the second two-dimensional surface grid. The adaptive grid generation method as described in claim 1, wherein the computer-aided engineering software is ABAQUS. The adaptive mesh generation method as described in claim 1, wherein the mesh cleaning software is PyMesh. An adaptive grid generation system includes: a processor; and a memory used to store a program code, the program code instructs the processor to execute an adaptive grid generation method, the adaptive grid generation method The method includes: (a) obtaining a first three-dimensional mesh of a target structure; (b) importing the first three-dimensional mesh into a computer-aided engineering software to obtain a first two-dimensional surface mesh; (c) Import the first two-dimensional surface mesh into a mesh cleaning software to obtain a second two-dimensional surface mesh; and (d) import the second two-dimensional surface mesh into the computer-aided engineering software to obtain a second two-dimensional surface mesh. Obtain a second three-dimensional mesh; wherein step (c) includes: performing a mesh cleaning method according to the first two-dimensional surface mesh to obtain an approximate two-dimensional surface mesh; when the first two-dimensional surface mesh When the area change rate between the grid and the approximate two-dimensional surface grid is greater than a predetermined change rate, adjust a grid cleaning coefficient of the grid cleaning method, and perform step (c) again; and when the first two-dimensional surface The area change rate between the grid and the approximate two-dimensional surface grid is less than or equal to the predetermined change rate, and the approximate two-dimensional surface grid is input as the second two-dimensional surface grid. The adaptive grid generation system as described in claim 4, wherein the computer-aided engineering software is ABAQUS. The adaptive mesh generation system as described in claim 4, wherein the mesh cleaning software is PyMesh.

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