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Topological optimization design method on basis of pseudo-density sequencing and with consideration of draft manufacturing constraints

A topology optimization and design method technology, applied in computing, special data processing applications, instruments, etc., can solve problems such as non-convergence of topology optimization process

Inactive Publication Date: 2012-08-15
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology

It can solve the problem that the topology optimization process does not converge due to the introduction of a large number of constraints and too many constraints

Method used

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  • Topological optimization design method on basis of pseudo-density sequencing and with consideration of draft manufacturing constraints
  • Topological optimization design method on basis of pseudo-density sequencing and with consideration of draft manufacturing constraints
  • Topological optimization design method on basis of pseudo-density sequencing and with consideration of draft manufacturing constraints

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Embodiment Construction

[0030] refer to Figure 5-7 . The present invention is illustrated by taking the topology optimization design of a two-dimensional cantilever beam as an example. The size of the two-dimensional cantilever beam is 500mm long and 100mm high. The left side of the cantilever beam is fully fixed; the right bottom corner is subjected to a vertical upward concentrated force load F=100N. Design the cantilever beam structure so that its stiffness is maximum and its volume fraction is maximum 60%. The direction of pull is vertically upward. The method steps are as follows:

[0031] The present invention proposes a topology optimization design method considering draft manufacturing constraints, including the following three key links:

[0032] (a) Finite element modeling.

[0033] The finite element model is established from the CAD model of the structure. The load is the vertical upward concentrated force load F=100N on the right bottom corner; the boundary condition is that the ...

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Abstract

The invention discloses a topological optimization design method on the basis of pseudo-density sequencing and with consideration of draft manufacturing constraints, which is used for realizing introducing draft manufacturing constraints in a topological optimization design of an irregular grid model. The technical scheme includes that the topological optimization design method includes sequencing the pseudo-densities of units on the same row in a draft direction again by the aid of a unit pseudo-density sequencing method; leading the pseudo-densities of the units to be distributed from large to small in the draft direction; and accordingly realizing draft constraint. By the aid of the method, design requirements of the draft constraints can be met without introducing a large quantity of constraints. The topological optimization design method solves the problems that a large quantity of constraint conditions are introduced into an existing method and a topological optimization process is not converged due to the excessive constraint conditions.

Description

technical field [0001] The invention relates to a topology optimization design method, in particular to a topology optimization design method based on pseudo-density sorting and considering draft manufacturing constraints. Background technique [0002] refer to Figure 1~3 . In aerospace, automobile manufacturing and other fields, there are a large number of mechanical parts that need to be manufactured by mold processing or sand casting, so draft issues need to be considered. Mold drafting is to ensure that the product can be demoulded smoothly during the production process of the mold; sand casting drafting is to remove the wooden mold from the sand without destroying the sand mold. The result of traditional structural topology optimization design cannot be manufactured by mold processing or sand casting. As the topology optimization method is widely used in engineering, the topology optimization method that considers various manufacturing constraints such as draft const...

Claims

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Application Information

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IPC IPC(8): G06F17/50
Inventor 谷小军刘虎朱继宏张卫红孟亮
Owner NORTHWESTERN POLYTECHNICAL UNIV
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