LU501804B1 - Fem method and computer storage medium - Google Patents
Fem method and computer storage medium Download PDFInfo
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- LU501804B1 LU501804B1 LU501804A LU501804A LU501804B1 LU 501804 B1 LU501804 B1 LU 501804B1 LU 501804 A LU501804 A LU 501804A LU 501804 A LU501804 A LU 501804A LU 501804 B1 LU501804 B1 LU 501804B1
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- 238000000034 method Methods 0.000 title claims abstract description 20
- 238000000605 extraction Methods 0.000 claims abstract description 3
- 238000001914 filtration Methods 0.000 claims 1
- 230000008878 coupling Effects 0.000 abstract description 5
- 238000010168 coupling process Methods 0.000 abstract description 5
- 238000005859 coupling reaction Methods 0.000 abstract description 5
- 230000010354 integration Effects 0.000 abstract description 4
- 241000282806 Rhinoceros Species 0.000 description 4
- 230000007547 defect Effects 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
Classifications
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/10—Geometric CAD
- G06F30/17—Mechanical parametric or variational design
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
- G06F30/23—Design optimisation, verification or simulation using finite element methods [FEM] or finite difference methods [FDM]
Abstract
Disclosed are a FEM method and a computer storage medium. The method includes the following steps: grouping geometric objects inputted and performing grid generation processing to obtain surface grids corresponding to each group of geometric objects, and performing error repair processing on the surface grids to obtain independent surface grids corresponding to each group of geometric objects; performing compatibility processing on all the independent surface grids to obtain a preliminary surface grid system, performing remeshing processing on the preliminary surface grid system to obtain a surface grid system, and performing feature extraction on the surface grid system to obtain feature information; and building a 3D finite element model according to the surface grid system and the feature information. Using the method, rapid FEM for a coupling system based on multiple engineering objects can be realized, which effectively improves the efficiency and functional integration of the whole process of FEM.
Description
FEM METHOD AND COMPUTER STORAGE MEDIUM LUS01804
[01] The present invention relates to the field of computer aided engineering (CAE), in particular to a finite element modeling (FEM) method and a computer storage medium.
[02] Finite element analysis (FEA), one of the most popular computer aided engineering (CAE) tools, uses mathematical approximation to simulate real physical systems (geometry and load conditions). It is used by engineers and scientists to model and solve engineering problems related to complex systems, such as analysis on Safety,
NVH (Noise, Vibration, Harshness), strength and durability, CFD (Computational Fluid
Dynamics) of automobile, aerospace, ship and other complex systems. FEA plays an important role in the performance analysis and control of researched and developed products especially at the stage of product research and development.
[03] In practical application, FEA is often required for a system composed of a plurality of objects, that is, a coupling system based on multiple engineering objects.
However, the existing FEM methods have the defects that the functional integration is low for the whole process of FEM, and quick FEM for FEA is lacked for a coupling system based on multiple engineering objects.
[04] In order to solve the defects in the existing FEM methods that the functional integration is low for the whole process of FEM, and quick FEM for FEA is lacked for a coupling system based on multiple engineering objects, the present invention provides a
FEM method and a computer storage medium.
[05] In order to solve the above-mentioned technical problems, the present invention provides a FEM method, including the following steps:
[06] grouping a plurality of geometric objects inputted and performing grid generation processing respectively to obtain surface grids corresponding to each group of geometric objects, and performing error repair processing on the surface grids corresponding to each group of geometric objects respectively to obtain independent surface grids corresponding to each group of geometric objects;
[07] performing compatibility processing on all the independent surface grids to obtain a preliminary surface grid system, performing remeshing processing on the preliminary surface grid system to obtain a surface grid system, and performing feature extraction on the surface grid system to obtain feature information; and
[08] building a 3D finite element model according to the surface grid system and the feature information.
[09] The present invention features the following beneficial effects: Surface grids representing the same object can be generated based on one or more geometric objects and error repair processing can be performed to obtain a surface grid system which is formed by combining a plurality of surface grids, without grid errors, that represent 1 different objects, a surface grid system composed of a plurality of mutually compatible LU501804 objects can be quickly obtained by compatibility processing and remeshing processing, and quick FEM can be realized for a coupling system based on multiple engineering objects based on the surface grid system, which effectively improve the efficiency and functional integration of the whole process of FEM.
[10] FIG 1 is a flow chart of a FEM method provided in an example of the present invention;
[11] FIG 2 is a flow chart of grid generation processing provided in an example of the present invention;
[12] FIG 3 is a view of point clouds provided in an example of the present invention;
[13] FIG 4 is a view of surface grids generated by point clouds provided in an example of the present invention;
[14] FIG Sis a view of a curve provided in an example of the present invention;
[15] FIG 61s a view of surface grids generated by a curve provided in an example of the present invention;
[16] FIG 7 is a view of a curved surface provided in an example of the present invention;
[17] FIG 8 is a view of surface grids generated by a curved surface provided in an example of the present invention.
[18] The following embodiments are the further interpretations and supplements of the present invention and do not constitute any limitation to the present invention.
[19] A FEM method in the embodiments of the present invention will be described below in combination with the accompanying drawings.
[20] As shown in FIG 1, the present invention provides a FEM method, including the following step:
[21] S1, a plurality of geometric objects inputted are grouped and grid generation processing is performed respectively to obtain surface grids corresponding to each group of geometric objects, and error repair processing is performed on the surface grids corresponding to each group of geometric objects respectively to obtain independent surface grids corresponding to each group of geometric objects.
[22] It should be noted that, geometric objects are built through geometric object information inputted. For example, the corresponding geometric object information is read from files (such as CAD drawing file and scanned point cloud file) containing geometric object information, and corresponding geometric objects are built and drawn in a Rhinoceros CAD system.
[23] Exemplarily, the inputted file information containing geometric object information is read and parsed by file type, and corresponding geometric objects are built. For example, the coordinate information is read from each line of a XYZ file, the grid information is read from an OFF file, the curve information can be read from a 2
DWG file of AutoCAD through a DWG reading library, and the curved surface LU501804 information can be read from a STL file through a STL reading library; and corresponding geometric objects are built through the geometric object information read, such as points, curves, curved surfaces and grids.
[24] Wherein the geometric objects built can be inputted into the Rhinoceros CAD system by means of a developer library provided by the Rhinoceros CAD system for drawing and display in a window.
[25] It can be understood that the geometric objects inputted are grouped by objects for FEA, so that one or more geometric objects can be divided into one group. The same group of geometric objects is corresponding to the same object, the surface grids generated for all geometric objects in the same group are used to represent the object corresponding to the group, and a system combined by a plurality of grids that represent different objects is formed through multiple groups of geometric objects.
[26] Specifically, in this example, the geometric object information inputted by a user is read, multiple groups of geometric objects corresponding to a plurality of objects for FEA are generated, surface grids are generated by a grid generation algorithm and error repair processing is performed to obtain independent surface grids, without grid errors, that represent different objects.
[27] Wherein the surface grids generated and the independent surface grids can be inputted into the Rhinoceros CAD system for drawing and display in a window.
[28] Optionally, in one example, as shown in FIG 2, a specific process of the grid generation processing includes the following steps:
[29] S1.1, grids are generated for geometric objects in a current group by geometric object types, and one of the grids generated for geometric objects is selected randomly as a first target mesh, and one of the remaining grids generated for geometric objects is selected randomly as a second target mesh;
[30] S1.2, a space region formed by a boundary point of the first target grid and a boundary point of the second target grid is interpolated to obtain interpolating points, interpolating points inside the geometric objects corresponding to the grids selected are filtered out, a grid is generated based on the filtered-out interpolating points, and merged with the first target grid and the second target grid to obtain a third target mesh; and
[31] S1.3, one of the remaining grids generated for geometric objects is selected randomly, and S1.2 is repeated based on the third target mesh, until all the grids generated for geometric objects in the current group are traversed to obtain surface grids corresponding to the current group of geometric objects.
[32] Specifically, in this example, corresponding grids are generated for a plurality of current geometric objects respectively by geometric object types (such as point cloud, curve and curved surface) and added to an input surface grid group; any grid is selected from the input surface grid group as a first target mesh, and any grid is selected from the remaining grids as a second target mesh; a space region formed by a boundary point of the first target grid and a boundary point of the second target grid is interpolated to obtain interpolating points, interpolating points inside the geometric objects corresponding to the grids selected are filtered out, a grid is generated based on the 3 filtered-out interpolating points and merged with the first target grid and the second LU501804 target grid to obtain a third target mesh, the first target grid and the second target grid are removed from an input target grid group, and the third target grid is added to the input surface grid group.
[33] The third target grid is used as a new first target mesh, one of the remaining grids generated for geometric objects in the input surface grid group is selected randomly as a new second target mesh, the steps described above are repeated until the input surface grid group only contains a third target mesh, and then the input surface grid group is outputted as a final result to obtain surface grids corresponding to the current group of geometric objects.
[34] It can be understood that when a current group only contains one geometric object, a grid generated for geometric object is directly used as a surface grid corresponding to the current group of geometric object; for example, one surface mesh is generated by just one point cloud, curve or curved surface. FIGS. 3-4 show surface grids generated when a current group of geometric objects are point clouds, FIGS. 5-6 show surface grids generated when a current group of geometric object is a curve, and
FIGS. 7-8 show surface grids generated when a current group of geometric object is a curved surface.
[35] When a current group contains at least two geometric objects, one surface grid is generated by such geometric objects. For example, a surface grid representing a closed curved surface of a 3D entity can be generated by a plurality of curves and a curved surface.
[36] When a grid is generated for a single geometric object, a plurality of interpolating points can be set in a target geometric object, and then a grid corresponding to the target geometric object can be generated by a grid generation algorithm (such as Advancing Front, Quad Tree, Delaunay and other unstructured meshing algorithms) in a relevant technology.
[37] Although the embodiments of the present invention have been shown and described above, it can be understood that the above-mentioned embodiments are exemplary and cannot be understood as a limitation to the present invention, and those of ordinary skill in the art can change, modify, substitute and transform the above-mentioned embodiments within the scope of the present invention. 4
Claims (2)
1. A FEM method, comprising the following steps: grouping a plurality of geometric objects inputted and performing grid generation processing respectively to obtain surface grids corresponding to each group of geometric objects, and performing error repair processing on the surface grids corresponding to each group of geometric objects respectively to obtain independent surface grids corresponding to each group of geometric objects; performing compatibility processing on all the independent surface grids to obtain a preliminary surface grid system, performing remeshing processing on the preliminary surface grid system to obtain a surface grid system, and performing feature extraction on the surface grid system to obtain feature information; and building a 3D finite element model according to the surface grid system and the feature information.
2. The FEM method of claim 1, wherein a specific process of the grid generation processing comprises the following steps:
S1.1, generating grids for geometric objects in a current group by geometric object types, and randomly selecting one of the grids generated for geometric objects as a first target mesh, and randomly selecting one of the remaining grids generated for geometric objects as a second target mesh;
S1.2, interpolating a space region formed by a boundary point of the first target grid and a boundary point of the second target grid to obtain interpolating points, filtering out interpolating points inside the geometric objects corresponding to the grids selected, generating a grid based on the filtered-out interpolating points, and merging the grid with the first target grid and the second target grid to obtain a third target mesh; and
S1.3, randomly selecting one of the remaining grids generated for geometric objects, and repeating S1.2 based on the third target mesh, until all the grids generated for geometric objects in the current group are traversed to obtain surface grids corresponding to the current group of geometric objects. 1
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| LU501804A LU501804B1 (en) | 2022-04-05 | 2022-04-05 | Fem method and computer storage medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| LU501804A LU501804B1 (en) | 2022-04-05 | 2022-04-05 | Fem method and computer storage medium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| LU501804B1 true LU501804B1 (en) | 2023-10-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| LU501804A LU501804B1 (en) | 2022-04-05 | 2022-04-05 | Fem method and computer storage medium |
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|---|---|
| LU (1) | LU501804B1 (en) |
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2022
- 2022-04-05 LU LU501804A patent/LU501804B1/en active IP Right Grant
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Effective date: 20231005 |