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Construction method of virtual model with geometric error based on fractal fusion of measured point cloud

A virtual model and geometric error technology, applied in the field of virtual assembly modeling, can solve the problems of lack of geometric error information in virtual assembly modeling

Active Publication Date: 2021-07-13
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to address the deficiencies of the prior art and provide a virtual model construction method with geometric errors based on the fractal fusion of measured point clouds to solve the problem of lack of geometric error information in virtual assembly modeling of mechanical products

Method used

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  • Construction method of virtual model with geometric error based on fractal fusion of measured point cloud
  • Construction method of virtual model with geometric error based on fractal fusion of measured point cloud
  • Construction method of virtual model with geometric error based on fractal fusion of measured point cloud

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Embodiment

[0126] figure 1 It is a flow chart of the virtual assembly model construction method implemented by the method example. Such as figure 1 As shown, the method for constructing a virtual model with geometric error based on the fractal fusion of the measured point cloud based on the virtual assembly modeling of mechanical products proposed by the present invention includes the following steps:

[0127] (1) Part surface point cloud sampling is carried out by coordinate measuring instrument. Such as Figure 5 It is the appearance diagram of the parts of the method example. Select a square area with a side length of 50mm on the surface of the guide rail support seat, and take the sampling interval s=0.05mm to obtain point cloud data s(x,y).

[0128] (2) Calculate the three-dimensional fractal dimension of the surface.

[0129] Take the initial particle size ε 0 2s=0.1mm, according to ε 0 Determine the meta-grained grid, and follow image 3 The flow chart shown calculates F(ε...

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Abstract

The invention discloses a method for constructing a virtual model with geometric errors based on the fractal fusion of measured point clouds. Firstly, the point cloud of the surface of the actual part is sampled according to the sampling theorem; then, the three-dimensional fractal dimension of the surface is solved by using the variable granularity residual method; and then According to the judgment of similarity and difference, the surface of the part is pre-reconstructed according to the fractal theory, and then the wavelet transform is used to decompose the multi-scale surface features of the pre-reconstructed surface, and the surface components of different frequencies are re-reconstructed in combination with the actual surface parameters to extract low-frequency Signal; Finally, a fractal reconstruction model fused with the measured point cloud is obtained. The invention can be used to construct a mechanical product surface model in a virtual environment for simulating geometric tolerance information.

Description

technical field [0001] The invention relates to a virtual assembly modeling method, in particular to a virtual model construction method with geometric errors based on fractal fusion of measured point clouds. Background technique [0002] With the improvement of mechanical design and manufacturing level, the precision of machined parts has been greatly improved. However, the geometric error of the surface of the part is still inevitable, and the surface of the machined part has self-similarity at the microscopic level. Irregular undulations contain the contour information of the surface topography of the component. This feature not only affects the accuracy of the part, but also affects the wear resistance, corrosion resistance, fatigue resistance, etc. of the part. In addition, it directly determines the Equipment assembly accuracy, product performance. [0003] Therefore, in the assembly link before the product, the real and accurate surface structure information of the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/20G06F30/17G01B21/00G01B21/20
CPCG01B21/00G01B21/20
Inventor 裘乐淼李恒张树有王自立谭建荣
Owner ZHEJIANG UNIV