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Reconstruction of parameterization model of quadrilateral finite element grid model

A parametric model and grid model technology, applied in electrical digital data processing, design optimization/simulation, special data processing applications, etc., can solve problems such as unfavorable calculations, and achieve the effect of easy integration and concise expression

Inactive Publication Date: 2016-07-20
UNIV OF SHANGHAI FOR SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

When using this method to create a mesh model, it is necessary to model the porous plate structure. Due to the existence of a large number of dense holes in these porous plate structures, the mesh obtained by the finite element analysis often exceeds the The computing capacity of the computer, which is not conducive to the subsequent calculation

Method used

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  • Reconstruction of parameterization model of quadrilateral finite element grid model
  • Reconstruction of parameterization model of quadrilateral finite element grid model
  • Reconstruction of parameterization model of quadrilateral finite element grid model

Examples

Experimental program
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Effect test

Embodiment 1

[0063] Figure 16 It is an example diagram of a nine-hole plate grid model divided in ANSYS. The model selected in the first embodiment is a regularly distributed nine-hole plate model, which is a square plate with nine through holes regularly distributed on it, such as Figure 16 As shown, the model is analyzed using the finite element analysis software ANSYS, and the obtained model is a grid model, and the grid units are all quadrilaterals.

[0064] Figure 17 The nine-hole plate grid model unit information table ELIST exported for ANSYS, Figure 18 The node information table NLIST of the nine-hole plate grid model exported for ANSYS. After using the finite element software to obtain the quadrilateral mesh model, the element numbers and node coordinates of the mesh model obtained by the finite element analysis software are used as input information, such as Figure 17 As shown, in NLIST, the first column is the node number, and the following ones are the x, y, and z coor...

Embodiment 2

[0110] In this second embodiment, descriptions of the same algorithms and steps as those in the first embodiment are omitted.

[0111] Figure 23 It is an example diagram of the operation of the L-shaped plate with holes. The model is an L-shaped plate with four through holes regularly distributed on it, such as Figure 23 As shown, the grid model obtained from the finite element analysis software is merged, the feature points are preserved and adjusted, and the feature points are connected to obtain several quadrilateral final sub-domains. Based on these final sub-domains, the two-dimensional parameter model is generated, adjusted and optimized. , the volume parameterized model suitable for isogeometric analysis can be obtained and exported.

Embodiment 3

[0113] Figure 24 It is an example diagram of the operation of the model of a foot-shaped plate with holes. The model is a foot-shaped plate with a large through-hole and three small through-holes distributed on it, such as Figure 24 As shown, the grid model obtained from the finite element analysis software is merged, the feature points are preserved and adjusted, and the feature points are connected to obtain several quadrilateral final sub-domains. Based on these final sub-domains, the two-dimensional parameter model is generated, adjusted and optimized. , the volume parameterized model suitable for isogeometric analysis can be obtained and exported.

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Abstract

The invention provides a parameterization reconstruction algorithm of a quadrilateral finite element grid model. By taking a quadrilateral grid model obtained by finite element analysis software as the basis, a unit number and a node coordinate of the quadrilateral grid model are used as input information for reconstructing a topological relation between quadrilateral grid units; merging operation including unit grid standard merging, block domain self-adaptive merging and the like are carried out according to obtained topological information, so that the quantity of block domains is reduced and merged sub-domains are obtained; characteristic points on boundaries of the sub-domains obtained by merging are remained and are connected to form a certain quantity of quadrilateral final sub-domains; and finally, a body parameterization model is obtained by carrying out construction, adjustment and optimization of a body parameter model according to the boundaries of the obtained final sub-domains. The algorithm can be used for carrying out parameterization reconstruction on the quadrilateral grid model of structures including a porous plate and the like, and the obtained body parameterization model is applicable to isogeometric analysis; and the algorithm has the advantages of simplicity in expression, whole-domain smoothing and the like.

Description

technical field [0001] The invention relates to a parametric reconstruction algorithm of a finite element model, in particular to a parametric reconstruction algorithm of a four-sided finite element grid model. Background technique [0002] In the current product design process, since the development of CAE (computer-aided engineering) technology is ahead of CAD (computer-aided design), the seamless integration of the two is a bottleneck problem, and about 70% of the running time of CAE software is used for data exchange , while the workload of discrete mesh generation accounts for about 80% of the entire CAD / CAE process. [0003] In order to solve the problem of seamless integration of CAE and CAD, a variety of analysis methods are available, among which the medium geometry analysis method has the advantages of strong flexibility, high accuracy, convergence, and simple setting of boundary conditions. The isogeometric analysis method of the simplified model has the potentia...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/23
Inventor 陈龙姚一鸣樊兴旺阮辰
Owner UNIV OF SHANGHAI FOR SCI & TECH
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