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Finite element preprocessing method for reconstructing three-dimensional entity model

A three-dimensional entity, entity model technology, applied in image data processing, electrical digital data processing, special data processing applications, etc., to achieve the effect of reducing preparation time, avoiding model errors and loss of important data, and reducing processing time

Inactive Publication Date: 2015-01-14
BEIHANG UNIV
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Problems solved by technology

[0008] The present invention proposes a finite element preprocessing method for three-dimensional solid model reconstruction, and its purpose is to solve the problem that the STL format file of the digital three-dimensional model cannot directly generate a three-dimensional solid model for finite element analysis

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  • Finite element preprocessing method for reconstructing three-dimensional entity model

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[0039] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0040] A kind of finite element pre-processing method used for three-dimensional solid model reconstruction of the present invention, see figure 1 As shown, the specific steps are as follows:

[0041] Step 1: Use the articulated arm to scan the product to obtain point cloud data.

[0042]Step 2: Import the obtained point cloud data into 3-matic software, and adjust the position of the model.

[0043] Step 3: Use the "Reduce Noice", "Subsample", and "Split" functions of the Point Cloud module in 3-matic to operate on the imported point cloud data. First remove isolated points and noise points in vitro to ensure the accuracy of the meshing process; then sample and process point cloud data to reduce the number of point clouds and ensure smooth follow-up operations; small features need to be cleared, modified and model simplified .

[0044] Step 4: Carry out grid ope...

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Abstract

A finite element pre processing method for reconstructing a three-dimensional entity model comprises the steps that first, a material object is scanned so that point cloud data can be acquired; second, the point cloud data are imported to 3-matic software, and the position of the model is adjusted; third, the point cloud data are de-noised and sampled; fourth, three-dimensional reconstructing of the point cloud data is performed through a computer, wherein the point cloud data are packaged so that a surface mesh model can be generated; fifth, thin wall characteristic analysis is performed on the model so that a basic model structure can be known; sixth, three-dimensional repair is performed on model meshes, so that the edges of the model are matched with the defect contour of the material object; seventh, the model is redesigned as required, and thus the structure of the model can be more reasonable and meet the design requirement; eighth, the meshes of the redesigned model are partitioned again; ninth, a volume mesh is generated, material attributes are added, and the new model is saved in the format through which finite elements can be directly analyzed; tenth, finite elements are analyzed. Through the method, the scanned data processing time is shortened and FEA / CFD pre processing time are shortened, and optimal design of the model can be conveniently performed.

Description

technical field [0001] The invention relates to a finite element preprocessing method for three-dimensional solid model reconstruction, which can be applied to digital three-dimensional solid modeling, and solves the problem that the STL format file of the digital three-dimensional model cannot directly generate a three-dimensional solid model for finite element analysis, and belongs to digitization The field of 3D solid model reconstruction. Background technique [0002] Reverse engineering (RE) technology and finite element (FEM) technology are two design and analysis methods that are more used in the new product development process in recent years. They are used in new product development and product modification design, product imitation, quality analysis and testing, and The field of optimization has been widely used. However, there is currently a lack of fast and effective connection between the two. Most of the 3D models generated by reverse engineering (RE) are in ...

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Application Information

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IPC IPC(8): G06T17/00G06F17/50
CPCG06T17/30
Inventor 王伟杨亚男赵罡韩鹏飞王帅
Owner BEIHANG UNIV
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