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Method and system for automatic construction of editable model for isogeometric topology optimization results

A topology optimization and automatic construction technology, applied in the research field of geometric topology optimization technology, can solve the problem that the optimization result cannot be selected and edited, achieve the effect of intuitive post-processing results, solve post-processing problems, and shorten the modeling time

Active Publication Date: 2022-07-26
SOUTH CHINA UNIV OF TECH
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Problems solved by technology

[0004] The main purpose of the present invention is to overcome the shortcomings and deficiencies of the prior art, and provide an editable model automatic construction method and system for isogeometric topology optimization results; firstly, any three-dimensional isogeometric topology optimization problem is decomposed into several design domains as planes parallel to each other Two-dimensional isogeometric topology optimization of the domain, and then process the two-dimensional topology optimization results into features that can be selected and edited in the CAD software, thus solving the problem that the optimization results in the traditional STL format cannot be selected and edited

Method used

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  • Method and system for automatic construction of editable model for isogeometric topology optimization results
  • Method and system for automatic construction of editable model for isogeometric topology optimization results

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Embodiment 1

[0054] Editable model automatic construction method for isogeometric topology optimization results, such as figure 1 shown, the steps are as follows:

[0055] In step S1, topology optimization based on isogeometric analysis of the three-dimensional flexible mechanism is performed.

[0056] Step S2: Obtaining the isogeometric topology optimization result of the three-dimensional flexible mechanism in layers according to the z direction, that is, the bottom-up direction, to obtain the NURBS surface information parameters of each layer. The design parameter in this example is the control point density, so the control point density is used as the third dimension information of the NURBS surface, that is, the height information, and the three-dimensional NURBS surface is obtained as the optimization information of the first layer.

[0057] Step S3: place the acquired N spline surfaces correspondingly and import them into the CAD software, and obtain the following figure 2 The N ...

Embodiment 2

[0066] Editable model automatic construction system for isogeometric topology optimization results, such as Figure 8 As shown in Figure 1, an editable model construction method based on topology optimization results is implemented, including: a three-dimensional isogeometric topology optimization module, a NURBS model layered acquisition module, a layered result import module, a surface top contour extraction module, a guide line establishment module, Internal contour judgment module, external contour stakeout stretching module, internal contour stakeout cutting module, scattered contour continuous stakeout module and result output module;

[0067] The three-dimensional isogeometric topology optimization module uses the isogeometric topology optimization method to solve any three-dimensional optimization problem;

[0068] The NURBS model layered acquisition module is used for layering the three-dimensional isogeometric topology optimization results into several spline surface...

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Abstract

The invention discloses a method for automatically constructing an editable model of an iso-geometric topology optimization result, aiming at the three-dimensional iso-geometric topology optimization problem, the method performs fast and efficient post-processing on the three-dimensional iso-geometric topology optimization result, and achieves the automatic construction of the result model. and editable purpose; this method extracts the spline surface represented by the control point of the three-dimensional isogeometric topology optimization result in layers by taking the design variable as the coordinate of one dimension higher than the control point, and stakes out the top contour of the spline surface. Thus, the steps of constructing the isogeometric topology optimization model are simplified; the present invention constructs the geometric model directly according to the isogeometric topology optimization result, and the automatically constructed model has the advantages of being selectable and editable.

Description

technical field [0001] The invention relates to the research field of isogeometric topology optimization technology, in particular to a method and system for automatically constructing an editable model of isogeometric topology optimization results. Background technique [0002] Isogeometric analysis, proposed by Hughes in 2005, is considered to be one of the most promising directions in the field of topology optimization. Because it innovatively proposes to use the most commonly used NURBS basis function in computer graphics as the basis function of the geometric model in topology optimization, it realizes the seamless integration from CAE to CAD, and solves the problem that CAE and CAD cannot be directly connected for decades. similar problems. [0003] At present, isogeometric topology optimization is widely used in various theoretical and engineering analysis problems due to its advantages of low time consumption and high precision. However, the representation of isoge...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/20G06F30/10
CPCG06F30/20G06F30/10G06F30/17G06F30/23G06T17/00G06T19/20G06T2219/2021
Inventor 王英俊杨雨豪廖中源
Owner SOUTH CHINA UNIV OF TECH
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