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Method for dividing hexahedral mesh of piston of internal-combustion engine

A hexahedron and internal combustion engine technology, applied in image data processing, 3D modeling, instruments, etc., can solve problems affecting the division of piston hexahedron units, affecting mesh quality, and insufficient recognition accuracy

Active Publication Date: 2010-03-17
CHONGQING CHANGAN AUTOMOBILE CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Using this method to divide the piston hexahedron unit, because the thickness of the piston ring groove is very small, usually only 1-2mm, and the minimum recognizable size in the method with the patent application number CN200510121431 is also above 2mm, so if the patent application number is adopted For the method of CN200510121431, for small gasoline engine pistons, the recognition accuracy is not enough to affect the grid quality
And then affect the division of the whole piston hexahedron unit

Method used

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  • Method for dividing hexahedral mesh of piston of internal-combustion engine

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Embodiment Construction

[0022] The method for dividing the hexahedral grid of the internal combustion engine piston disclosed by the present invention will be specifically described below in conjunction with the accompanying drawings.

[0023] first step, such as figure 1 As shown, the three-dimensional geometric model of the piston is established first. The establishment of the model can use commonly used commercial 3D software, such as Pro / E, CATIA, UG.

[0024] The second step, such as figure 2 As shown, remove the piston ring land. This step can be realized by the 3D software mentioned in the first step. Due to different models, the number of piston ring banks is also different. Regardless of model, remove all lands between the first land and the last groove. In this embodiment, the second and third lands are removed.

[0025] The third step, such as image 3 As shown, for the initial topology of the piston with the ring bank removed, the initial topology is to use the principle of maximu...

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Abstract

The invention relates to a method for dividing hexahedral mesh of a piston of an internal-combustion engine, comprising the following steps: (1) a three-dimensional geometric model is built; (2) a piston ring land is removed: (3) initial topology is carried out to the piston which removes the piston ring land, and the volume of the hexahedral mesh after initial topology is carried out is more thanthe volume of the three-dimensional geometric model; (4) the piston which removes the piston ring land is divided into a two-dimensional closed surface mesh; (5) topology computation is carried out to an initial finite element model and the two-dimensional closed surface mesh, so as to obtain the finite element model; (6) a piston ring land mesh is artificially added. By adopting the method to build and divide the hexahedral mesh of the piston, the piston ring land is removed, and finally the ring land is built, so as to conveniently process irregular parts in the piston and improve the working efficiency of division of the whole hexahedral unit of the piston.

Description

technical field [0001] The invention belongs to the field of computer image processing, and in particular relates to a method for dividing hexahedral grids of internal combustion engine pistons. Background technique [0002] In the process of modern internal combustion engine design, CAD (Computer Aided Design) and CAE (Computer Aided Engineering) technologies are often used in order to improve the reliability of the design to save time and reduce the failure rate of experiments. CAD software includes CATIA, PRO / E, UG, etc., and CAE software includes NASTRAN, ABAQUS, etc. The digital three-dimensional geometric model is established by using CAD software, and then the three-dimensional geometric model is discretized by CAE pre-processing software to establish a finite element model. [0003] In the process of application, due to the complex structure of the piston, if the tetrahedral element is used, there will be defects such as many tetrahedral element nodes, large matrix,...

Claims

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Application Information

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IPC IPC(8): G06T17/40G06T19/00
Inventor 司庆九詹樟松闵龙徐勇
Owner CHONGQING CHANGAN AUTOMOBILE CO LTD
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