Method for generating quadrangle finite element grid based on three-dimensional solid model

A 3D entity and grid generation technology, applied in the field of engineering analysis, can solve the problems of quadrilateral network efficiency and quality are not very ideal, and achieve the effect of easy generation and simplification of complex problems

Inactive Publication Date: 2008-11-12
DALIAN POLYTECHNIC UNIVERSITY
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Problems solved by technology

From an algorithm point of view, since a transitional triangular mesh is generated in advance, and then a quadrilateral mesh is generated, the efficiency and quality of generating a quadrilateral network are not ideal

Method used

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  • Method for generating quadrangle finite element grid based on three-dimensional solid model
  • Method for generating quadrangle finite element grid based on three-dimensional solid model
  • Method for generating quadrangle finite element grid based on three-dimensional solid model

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Embodiment Construction

[0044] like Figure 1 - Figure 1 Shown in 4, the quadrilateral finite element grid generation method based on three-dimensional solid model is characterized in that, comprises the following steps:

[0045] (1.1) Encapsulate the three-dimensional solid model in a cuboid containing box suitable for its shape;

[0046] (1.2) Subdivide the cuboid containing box into a certain number of cube units, and delete the cube units that do not intersect with the surface of the three-dimensional solid model;

[0047] (1.3) Decompose each cube unit intersecting with the surface of the three-dimensional solid model into six mutually independent quadrilateral faces, and delete the quadrilateral faces that are located inside the three-dimensional solid model and intersect with it;

[0048] (1.4) Project the four nodes located on each quadrilateral patch outside the 3D solid model to the model surface, and use the four new nodes obtained after projection to form a new quadrilateral patch, and c...

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Abstract

The invention discloses a method for generating a quadrilateral finite element grid based on a three-dimension entity model, which is applicable to the preprocessing stage of the finite element analysis. The method comprises the steps of encapsulating a three-dimension entity model in a cuboid containing box adapting to the shape of the model, subdividing the cuboid containing box into a certain quantity of cubic units, deleting the cubic units disjointed with the surface of the three-dimension entity model, dividing each cubic unit intersected with the surface of the three-dimension entity model into six mutually independent quadrilateral facets, deleting quadrilateral facets intersected with and arranged in the three-dimension entity, projecting four nodes on each quadrilateral facet arranged outside the three-dimension entity model onto the surface of the model and combining four new nodes obtained after the projection into a new quadrilateral facet, combining all the quadrilateral facets to obtain the quadrilateral grid of the three-dimension entity model and storing the generated quadrilateral grid data into a user-defined data file in the DPM format.

Description

technical field [0001] The invention belongs to the field of engineering analysis, and relates to a method for generating quadrilateral finite element grids based on a three-dimensional solid model, and is especially suitable for the preprocessing stage of finite element analysis. Background technique [0002] Finite element mesh generation is a prerequisite for finite element analysis. It divides the object into a finite number of units, and the units are connected to each other through a finite number of nodes. When performing finite element analysis, the elements of the finite element grid can be regarded as non-deformable rigid bodies. The force between the elements is transmitted through the nodes, and then the matrix of each element is established by using the energy principle. After inputting material properties, loads and constraints, etc. After the boundary conditions, the computer is used to calculate the mechanical properties of the object such as deformation, str...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T17/20G06F17/50
Inventor 李吉平施殿波毕振军耿梦朱华伟
Owner DALIAN POLYTECHNIC UNIVERSITY
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