3D model internal hole digging type lightweight method based on function representation

A lightweight, model-based technology, applied in the field of hollow optimization of 3D printed objects, can solve problems such as rough shape representation and difficulty in accurately describing internal complex structures, and achieve the effect of large available design space, accurate representation and optimized solutions

Active Publication Date: 2020-07-03
DALIAN UNIV OF TECH
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, the existing methods have problems such as local self-intersection, non-smooth shape representation, and difficulty in accurately describing the internal complex structure.

Method used

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  • 3D model internal hole digging type lightweight method based on function representation
  • 3D model internal hole digging type lightweight method based on function representation
  • 3D model internal hole digging type lightweight method based on function representation

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Embodiment Construction

[0067] The specific implementation manners of the present invention will be further described below in conjunction with the accompanying drawings and technical solutions.

[0068] like figure 1 As shown, it is a schematic flow chart of the present invention. This embodiment takes standing stability as an example to illustrate the specific implementation of the present invention. It can be divided into three main steps: 3D model function representation with holes, problem model establishment, and optimization solution:

[0069] (1) 3D model function representation

[0070] In order to obtain the interpolation function representing the inner and outer surfaces of the model, it is necessary to find the weight {a i} and {b i} value. Take the function value f=1 of the external control point, the function value f=-1 of the internal control point, and the function value f=0 of the control point on the model surface. Use the RBF radial basis function to calculate the distance valu...

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Abstract

The invention discloses a 3D shape internal hole digging type lightweight method based on function representation, and belongs to the field of computer aided design. The method comprises the followingsteps: firstly, expressing and exploring effective shape optimization analytical calculation by utilizing a function, then designing a stress structure of a 3D model by constructing an energy function model under given external condition constraints, modeling an object mass center, standing stability, tumbler design and suspension problems, and giving out a corresponding discretization form; andfinally, respectively carrying out geometric optimization on the modeling problems to obtain the internal shape of the optimized object under a given constraint condition. According to the method, thedesign and optimization period of the hole structure is greatly shortened, and a theoretically optimal result can be given. According to the method, the internal cavities of the obtained model are smoother and are not limited by the number of the cavities, the object model has a lower centroid, more materials are saved, and the consumed time in the aspects of design and optimization is shorter.

Description

technical field [0001] The invention belongs to the technical field of computer-aided design, engineering design and manufacturing, and relates to a light-weight method of digging holes inside a 3D model based on function representation, which is suitable for the design and optimization of the hollowing of general parts, especially for 3D Hollow optimization of printed objects. Background technique [0002] Internal hollowing is an effective lightweight method that satisfies functional purposes without changing the external shape of the 3D object. This method can greatly reduce the use of materials and manufacturing costs, and is widely used in fields such as environmental protection and material saving. However, the existing methods have problems such as local self-intersection, non-smooth shape representation, and difficulty in accurately describing the internal complex structure. How to avoid the self-intersection problem, and at the same time describe the shape of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/23G06F30/10B29C64/386B33Y50/00G06F119/14G06F119/18
CPCB29C64/386B33Y50/00G06F30/10G06F30/23G06F2111/10G06F2113/10
Inventor 王胜法杨均张龙飞罗钟铉
Owner DALIAN UNIV OF TECH
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