Gradient dot matrix structure design method based on topological optimization

A technology of lattice structure and topology optimization, applied in computing, special data processing applications, instruments, etc., to achieve the effect of ensuring rationality, high algorithm efficiency, and avoiding repetition

Active Publication Date: 2019-05-17
BEIHANG UNIV
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Problems solved by technology

However, the traditional periodic lattice structure cannot fully meet the actual needs of the project, and the method of uniformly distributing materials inside the structure does not make the materials be used reasonably, and there is still a lot of room for improvement in performance.

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  • Gradient dot matrix structure design method based on topological optimization
  • Gradient dot matrix structure design method based on topological optimization
  • Gradient dot matrix structure design method based on topological optimization

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Embodiment Construction

[0042] S1: Take the supporting device of a quadrotor aircraft wing as an example below to illustrate the present invention. Such as figure 2 As shown, the circular hole at the left end of the structure bears the tensile force along the axis, the circular hole at the right end bears the fixed constraint, and the middle connecting rod plays the role of connecting structure and transmitting force. Establish the finite element model of the initial structure, the structural material is stainless steel, its elastic modulus E = 2e11Pa, Poisson's ratio υ = 0.3, density ρ = 7.9e-3g / mm 3 . The design domain and non-design domain of the structure are divided as figure 2 shown.

[0043] S2: Set the penalty factor of topology optimization to 3, the volume fraction to 0.4, and use the variable density method for topology optimization design. The obtained topology optimization results are as follows image 3 As shown, the display threshold of unit density in this result is 0.3, that is...

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Abstract

The invention discloses a topological optimization-based gradient lattice structure design method, which comprises the following steps of: 1, establishing a geometric model of an initial structure, and determining a design domain and a non-design domain; 2, setting topological optimization parameters, and determining an optimal force transmission path and relative density distribution informationof the initial structure; 3, extracting relative density information of the finite element unit, a Mizeasts stress value and coordinate information of the finite element unit; 4, selecting a proper cell to fill the structural design domain, and deleting repeated support columns in the lattice structure; 5, establishing a mathematical model of additive manufacturing process constraint; 6, establishing a mapping function relationship among the unit stress value, the relative density value and the lattice cell pillar size, and determining the pillar size; And 7, outputting a final geometric modelof the lattice structure. The distribution reasonability of the structural material can be ensured; The repetition of a topological optimization process is avoided, and the algorithm efficiency is high; The method can be suitable for the lattice design of complex geometric configurations; And a lattice structure with gradient change of the pillar size can be established.

Description

technical field [0001] The invention relates to a gradient lattice structure design method based on topology optimization, which belongs to the technical field of structural lightweight design. Background technique [0002] Aviation and aerospace fields have high requirements for structural lightweight design. Lattice structures have broad application prospects in the above fields due to their performance advantages of high specific stiffness and specific strength, as well as functional potential for energy absorption and shock absorption. Especially with the rapid development of additive manufacturing technology, the difficulty of manufacturing lattice structures has been reduced, making lattice structures a research hotspot in the field of lightweight design. However, the traditional periodic lattice structure cannot fully meet the actual needs of the project. The method of uniformly distributing the materials inside the structure does not make the materials be used reason...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
Inventor 蔡金虎
Owner BEIHANG UNIV
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