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Structural dynamics topological optimization design method driven by critical stiffness

A technology of topology optimization and critical stiffness, applied in design optimization/simulation, computer-aided design, calculation, etc., can solve problems such as limited structural optimization design space, damaged structure optimality, and limited lifting range, so as to avoid normalization Dealing with, avoiding resonance failure, and ensuring the effect of static stiffness performance

Pending Publication Date: 2022-05-24
NANJING UNIV OF SCI & TECH +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Constrained by the traditional design concept and manufacturing process, the discontinuous design mode is very easy to interfere and damage the optimality of the structure, which limits the optimization design space of the structure and makes the improvement of product performance very limited.

Method used

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  • Structural dynamics topological optimization design method driven by critical stiffness
  • Structural dynamics topological optimization design method driven by critical stiffness
  • Structural dynamics topological optimization design method driven by critical stiffness

Examples

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Embodiment

[0090] Taking the three-dimensional cantilever beam as an example, the structural changes in the optimization process are as follows: figure 2 shown.

[0091] Among them, the two-stage topology optimization implements the asymptotic structural optimization method based on the soft-kill strategy to find the critical stiffness using the volume asymptotic process; in the design domain transformation and material element mapping, the retained material elements are used as solutions, and the removed material elements (ie Assigned x under soft kill strategy i =x min Design variables) are not included in the scope of the optimization solution; conformal constraints are imposed during the optimization process to ensure that the optimization results of the second stage are connected with the optimization results of the first stage in three-dimensional space, and that the Boolean sum operation obtains an overall structure .

[0092] image 3 The flow chart of the two-stage single-ob...

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Abstract

The invention discloses a structural dynamics topological optimization design method driven by critical stiffness, which comprises the following steps of: by taking an original design domain and an optimization model as input, relaxing a static stiffness and inherent frequency coupled multi-objective optimization model into two continuous single-objective topological optimization stages by utilizing critical stiffness information; and carrying out design domain transformation processing between the two stages of topological optimization, and combining optimal solutions of the two stages as an approximate solution of an original problem. The static stiffness performance of an optimization result is guaranteed, the inherent frequency of the structure can be effectively improved, and resonance failure of parts under the dynamic load is avoided.

Description

technical field [0001] The invention belongs to the technical field of structural lightweight design, in particular to a critical stiffness-driven structural dynamics topology optimization design method. Background technique [0002] As an important means of structural innovation design and structural lightweight design, the topology optimization design method can realize the optimal distribution of materials under the constraints of multiple loads and working conditions, and effectively improve the utilization rate of materials. With the development of additive manufacturing technology, it has solved the difficulty in the preparation of complex structures in traditional manufacturing methods, especially the difficulty of preparing structures such as special-shaped pipes and disordered porous structures, greatly expanding the degree of freedom of structural design, and providing new opportunities for structural lightweight design. opportunity. Carrying out research on the s...

Claims

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Application Information

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IPC IPC(8): G06F30/23G06F30/15G06F119/14G06F113/10
CPCG06F30/23G06F30/15G06F2119/14G06F2113/10Y02T90/00
Inventor 廖文和皇甫义栋刘婷婷王聪李大伟张长东邢飞唱丽丽锁红波史建军
Owner NANJING UNIV OF SCI & TECH