CN112613216A - Rapid high-quality finite element modeling method for complex structure - Google Patents
Rapid high-quality finite element modeling method for complex structure Download PDFInfo
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- CN112613216A CN112613216A CN202011549906.0A CN202011549906A CN112613216A CN 112613216 A CN112613216 A CN 112613216A CN 202011549906 A CN202011549906 A CN 202011549906A CN 112613216 A CN112613216 A CN 112613216A
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- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000004364 calculation method Methods 0.000 claims abstract description 11
- 238000010586 diagram Methods 0.000 description 4
- 230000005484 gravity Effects 0.000 description 4
- 238000004458 analytical method Methods 0.000 description 3
- 238000005094 computer simulation Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000012217 deletion Methods 0.000 description 1
- 230000037430 deletion Effects 0.000 description 1
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- 238000003801 milling Methods 0.000 description 1
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- 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
The invention discloses a rapid high-quality finite element modeling method for a complex structure, which comprises the following steps: 1) modeling a surface; 2) dividing a face grid; 3) stretching the formed body and the body mesh; 4) the redundant portion is deleted. Compared with the existing finite element modeling method for the complex structure, the method has the advantages of high modeling speed and good grid quality, and can improve the finite element calculation accuracy.
Description
Technical Field
The invention relates to the technical field of finite elements, in particular to a quick high-quality finite element modeling method for a complex structure.
Background
The finite element model is a computational model for performing a finite element analysis, which provides all necessary raw data for the finite element calculation. The process of establishing a finite element model is called finite element modeling, which is the key of the whole finite element analysis process, and whether the model is reasonable or not directly influences the precision of a calculation result, the length of calculation time, the size of storage capacity and whether the calculation process can be completed or not. The prior art has many innovative schemes related to finite element modeling, such as: a rapid finite element modeling and solving analysis method based on image recognition (patent application No. CN201610857989.7) belongs to an image recognition finite element modeling method, and a rapid finite element modeling method for a wallboard welding machine milling triangular grid reinforced structure (patent application No. CN201610821260.4) belongs to the field of finite element modeling methods for specific structures.
However, the existing finite element modeling still has many defects, and the main reason is that the existing finite element modeling needs to establish a body first, then define materials and parameters, and divide a grid, for a complex structure, the number of bodies is large, the time for establishing a model is long, in addition, because many bodies of the complex model are irregular, the high-quality grid is difficult to divide by adopting a conventional method, and the influence on the accuracy of a calculation result is large.
Disclosure of Invention
The invention aims to solve the technical problem that the existing complex structure finite element modeling method is long in time and difficult to divide high-quality grids, so that the accuracy of a calculation result is greatly influenced. The method for rapidly modeling the finite element with the complex structure and the high quality can solve the problems.
The invention is realized by the following steps:
a rapid high-quality finite element modeling method for a complex structure mainly comprises the following steps: 1) modeling a surface; 2) dividing a face grid; 3) stretching the formed body and the body mesh; 4) the redundant portion is deleted.
Wherein the surface modeling comprises: firstly, analyzing a complex structure, selecting a main structure section direction, then overlapping all structure sections in the direction, subdividing the overlapped structure sections into a minimum large mesh, breaking each overlapped mesh at a node, checking and confirming the common points of line segments at all nodes, then generating a face area in cad, importing the face area into finite element software through a specific format, and then merging the imported faces.
The mesh for dividing the surface comprises: defining materials and parameters, defining surface unit types, endowing large mesh material types, dividing surface meshes firstly, determining the number of meshes according to the requirement of calculation precision, dividing the meshes into quadrilateral meshes, and locally transiting a small number of triangular meshes.
The stretch formers and the body mesh include: the body and the mesh are simultaneously generated by successively stretching according to the structure size and importance along the direction perpendicular to the main section, and the number of the mesh at each stretching is defined.
Deleting the redundant portion includes: selecting unnecessary holes and other parts to form a set, checking after the selection is finished, clearing grids of the part of holes to which the part of holes belong firstly after the checking is correct, and then deleting the parts of holes.
Compared with the existing finite element modeling method for the complex structure, the method has the advantages of high modeling speed and good grid quality, and can improve the finite element calculation accuracy.
Drawings
FIG. 1 is a schematic of the surface modeling of the present invention;
FIG. 2 is a schematic diagram of a split-surface grid according to the present invention;
FIG. 3 is a schematic representation of a stretched former and a body lattice of the present invention;
FIG. 4 is a schematic diagram of the invention with redundant deletion;
FIG. 5 is a schematic diagram of a finite element mesh for a gravity dam;
FIG. 6 is a schematic view of a finite element mesh of a ship lift;
FIG. 7 is a schematic diagram of a finite element mesh of a certain engineering gate pier;
FIG. 8 is a schematic view of a model of a gravity dam foundation process.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
As shown in fig. 1-4, the present invention comprises the following steps:
(1) surface modeling
Firstly, analyzing a complex structure, selecting a main structure section direction, then overlapping all structure sections in the direction, subdividing the overlapped structure sections into a minimum large grid, breaking each overlapped grid at a node, checking and confirming the common points of line segments at all nodes, then generating a surface area in cad, importing the surface area into finite element software through a specific format, and then merging the imported surfaces;
(2) divided surface grid
Then defining material and parameters, defining surface unit type, giving large mesh material type, dividing surface mesh, determining mesh number according to calculation precision, dividing the mesh into quadrilateral mesh, and locally transiting a small amount of triangular mesh.
(3) Stretch formed body and body lattice
The body and the mesh are then simultaneously produced by successive stretches according to the structure size and importance along the direction perpendicular to the main section, defining the number of meshes per stretch.
(4) Deleting redundant parts
Then, unnecessary holes and other parts are selected to form a set, the selection is finished and then checked, the grids of the body to which the holes belong are firstly removed after the check is correct, and then the body is deleted.
Fig. 5-8 show a finite element mesh of a gravity dam, a finite element mesh of a ship lift, a finite element mesh of an engineering gate pier, and a processing model of a foundation of a gravity dam, respectively, established according to the method of the present invention.
Of course, the above is only a specific application example of the present invention, and other embodiments of the present invention are also within the scope of the present invention.
Claims (5)
1. A rapid high-quality finite element modeling method for a complex structure is characterized by comprising the following steps: 1) modeling a surface; 2) dividing a face grid; 3) stretching the formed body and the body mesh; 4) the redundant portion is deleted.
2. The method for rapid high-quality finite element modeling of a complex structure according to claim 1, wherein: the surface modeling includes: firstly, analyzing a complex structure, selecting a main structure section direction, then overlapping all structure sections in the direction, subdividing the overlapped structure sections into a minimum large mesh, breaking each overlapped mesh at a node, checking and confirming the common points of line segments at all nodes, then generating a face area in cad, importing the face area into finite element software through a specific format, and then merging the imported faces.
3. The method for rapid high-quality finite element modeling of a complex structure according to claim 1, wherein: the division surface grid includes: defining materials and parameters, defining surface unit types, endowing large mesh material types, dividing surface meshes firstly, determining the number of meshes according to the requirement of calculation precision, dividing the meshes into quadrilateral meshes, and locally transiting a small number of triangular meshes.
4. The method for rapid high-quality finite element modeling of a complex structure according to claim 1, wherein: the stretched formed body and the body mesh include: the body and the mesh are simultaneously generated by successively stretching according to the structure size and importance along the direction perpendicular to the main section, and the number of the mesh at each stretching is defined.
5. The method for rapid high-quality finite element modeling of a complex structure according to claim 1, wherein: the deleting of the redundant part includes: selecting unnecessary holes and other parts to form a set, checking after the selection is finished, clearing grids of the part of holes to which the part of holes belong firstly after the checking is correct, and then deleting the parts of holes.
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| US20150221130A1 (en) * | 2014-02-05 | 2015-08-06 | Fujitsu Limited | Mesh quality improvement in computer aided engineering |
| US20190209035A1 (en) * | 2018-01-11 | 2019-07-11 | Zhejiang University | Method for noninvasive imaging of cardiac electrophysiological based on low rank and sparse constraints |
| CN111261294A (en) * | 2018-11-30 | 2020-06-09 | 上海市同济医院 | Method and device for establishing cervical spinal cord simulation model |
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2020
- 2020-12-24 CN CN202011549906.0A patent/CN112613216A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120281013A1 (en) * | 2009-11-04 | 2012-11-08 | Digital Forming Ltd | User interfaces for designing objects |
| US20150221130A1 (en) * | 2014-02-05 | 2015-08-06 | Fujitsu Limited | Mesh quality improvement in computer aided engineering |
| US20190209035A1 (en) * | 2018-01-11 | 2019-07-11 | Zhejiang University | Method for noninvasive imaging of cardiac electrophysiological based on low rank and sparse constraints |
| CN111261294A (en) * | 2018-11-30 | 2020-06-09 | 上海市同济医院 | Method and device for establishing cervical spinal cord simulation model |
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