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Multi-disciplinary reliability optimized design method under condition of interval uncertainty based on sequential method

An uncertainty, optimization design technology, applied in the field of multidisciplinary reliability optimization design under the condition of interval uncertainty based on sequential method, to achieve the effect of improving computational efficiency

Active Publication Date: 2018-01-23
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are few studies at home and abroad on the multidisciplinary reliability optimization design method under the condition of interval uncertainty.

Method used

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  • Multi-disciplinary reliability optimized design method under condition of interval uncertainty based on sequential method
  • Multi-disciplinary reliability optimized design method under condition of interval uncertainty based on sequential method
  • Multi-disciplinary reliability optimized design method under condition of interval uncertainty based on sequential method

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Embodiment 1

[0045] In order to fully understand the characteristics of the invention and its applicability to engineering practice, this invention adopts a two-discipline coupling system for reliability optimization design, and compares the results obtained by the invention with those obtained by conventional reliability optimization design. The mathematical description of the present embodiment is as follows:

[0046]

[0047]Table 1 gives the uncertainty information of the input parameters in this embodiment, and the allowable reliability is set to 0.9

[0048] Table 1

[0049]

[0050] The specific results are shown in Table 2:

[0051] Table 2

[0052]

[0053] where N D is the number of optimization searches, N I is the number of uncertainty analysis, N R is the number of reliability analyzes.

[0054] It can be seen from Table 2 that the optimization results obtained by the proposed method of the present invention and the conventional reliability optimization design m...

Embodiment 2

[0056] In order to fully understand the characteristics of the invention and its applicability to engineering practice, a hypersonic wing multidisciplinary reliability optimization design problem is used to verify its effectiveness. Such as figure 2 The hypersonic wing shown is composed of beams, ribs, honeycomb sandwich and skin. The beams and ribs are made of titanium alloy materials, forming the basic frame of the wing. The titanium alloy skin covers the surface of the wing, and the honeycomb paper is filled between the skin, ribs and beams.

[0057] In this example, the thickness of ribs and beams (L rib , L beam ) is a design variable and also an uncertain variable, the elastic modulus E of titanium alloy T and allowable maximum displacement d allowable is an uncertain variable. The reliability constraint is: η(dis max ≤dis allowable )≥0.99. The optimization goal is to minimize the wing weight. The description of uncertain variables is shown in Table 3:

[0058...

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Abstract

The invention discloses a multi-disciplinary reliability optimized design method under the condition of interval uncertainty based on a sequential method, and belongs to the field of multi-disciplinary reliability optimized design. The method comprises the steps of firstly building a mathematical model for multi-disciplinary reliability optimized design; secondly, executing certainty multi-disciplinary optimized design; then performing uncertainty analysis according to acquired optimization design points and computing reliability; and at last computing a constraint translation distance and judging whether the distance is converged, if yes, outputting the optimal design point, and otherwise performing a next cycle until the distance is converged. Numerical experiments show that compared with conventional multi-disciplinary reliability optimized design, the method provided by the invention is significantly improved in computation efficiency, and a new thought is provided for multi-disciplinary reliability optimized design method under the condition of interval uncertainty.

Description

technical field [0001] The invention relates to the technical field of multidisciplinary reliability optimization design, in particular to a sequential method-based multidisciplinary reliability optimization design method under interval uncertainty conditions. Background technique [0002] Multidisciplinary design Optimum design shows great potential in dealing with complex engineering problems, designers can grasp the coupling effect and synergistic effect between disciplines to improve the design. However, various uncertainties are caused in practical engineering due to lack of knowledge, random material properties, design and manufacturing flaws, different loading conditions, etc. With the rapid development of modern technology and the increasing requirements for the robustness and safety of engineering systems, multidisciplinary reliability optimization design has developed rapidly and has been widely used in engineering practice. [0003] The conventional multidiscipli...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
Inventor 王磊熊闯王晓军刘鑫任强
Owner BEIHANG UNIV
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