Feature modeling-based topology optimization design method for cyclic symmetric cylindrical support structure

A technology of cyclic symmetry and design method, applied in computing, special data processing applications, instruments, etc., can solve problems such as poor practicability and achieve good practicability

Active Publication Date: 2017-12-26
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology

[0004] In order to overcome the shortcomings of poor practicability of the existing topology optimization design methods for cyclic symmetric structures, the present invention provides a topology optimization design method for cyclic symmetric cylindrical support structures based on feature modeling

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  • Feature modeling-based topology optimization design method for cyclic symmetric cylindrical support structure
  • Feature modeling-based topology optimization design method for cyclic symmetric cylindrical support structure
  • Feature modeling-based topology optimization design method for cyclic symmetric cylindrical support structure

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Embodiment Construction

[0039] refer to Figure 1-3 . The topology optimization design method of the cyclic symmetric cylindrical support structure based on feature modeling in the present invention considers the plane cyclic symmetric structure under the plane strain state, and the adjacent radial unit cells form a linear proportional relationship. The basic parameters are shown in Table 1.

[0040] Table 1

[0041]

[0042] Specific steps are as follows:

[0043] Step 1: Calculating the radial side length of the radially inner unit cell and the scale factor of the adjacent radial unit cell. Due to the difference in the inner and outer radii of the cyclic symmetric structure, the size of the radial unit cell changes in a geometric sequence to ensure that the radial unit cell has the same topological configuration, and the sum of the radial side lengths of the radial unit cell is equal to the inner and outer radii of the cyclic symmetric structure Therefore, the radial side length d of the rad...

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Abstract

The invention discloses a feature modeling-based topology optimization design method for a cyclic symmetric cylindrical support structure, and aims to solve the technical problem of poor practicality of an existing topology optimization design method for a cyclic symmetric structure. According to the technical scheme, the method comprises the steps of calculating the radial side length of a radial inner layer unit cell and a proportional factor of an adjacent radial unit cell; arranging the cyclic symmetric structure in an embedded region divided into regular quadrilateral grids; determining a unit cell number which a grid node belongs to; performing translation and proportional amplification on a shape feature defined in a basic unit cell; calculating a level set function at the grid node through coordinate conversion; judging the type of a finite element according to a relative position of the grid node and a structure boundary; applying a boundary condition and a load; and building a fixed grid-based planar cyclic symmetric structure mechanics model. A shape feature position, a tilt angle and a size variable are selected as optimization problem design variables; through translation, rotation and deformation of the shape feature, the topology optimization design of the planar cyclic symmetric structure is realized; and the practicality is high.

Description

technical field [0001] The invention relates to a topology optimization design method for a cyclic symmetric structure, in particular to a feature modeling-based topology optimization design method for a cyclic symmetry cylindrical support structure. Background technique [0002] Cyclic symmetrical cylindrical support structures are a special type of structural form that widely exists in the aerospace field. They are usually cylindrical bodies with a long longitudinal axis. The planar circular symmetric structure formed by the periodic array of , and the shape does not change along the axis. Therefore, it is generally considered to carry out topology optimization design on the cross-sectional configuration of the cyclic symmetrical cylindrical support structure, so as to effectively improve its mechanical properties and reduce the structural weight. [0003] The literature "Static progressive topology optimization design of cyclic symmetric structures [J]. Gao Tong, Zhang W...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/15G06F30/17
Inventor 张卫红周莹朱继宏徐钊
Owner NORTHWESTERN POLYTECHNICAL UNIV
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