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Structural probability optimized design method

An optimized design and probability technology, applied in computing, special data processing applications, instruments, etc., can solve problems such as difficult to popularize and apply, unable to improve the efficiency of optimized design, and achieve the effect of improving reliability

Active Publication Date: 2014-06-18
上海秦耀航空试验技术有限公司
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Problems solved by technology

These uncertainty optimization methods all use more accurate methods in reliability analysis, which cannot improve the efficiency of optimization design, and are difficult to be popularized and applied in engineering.

Method used

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specific Embodiment

[0051] Such as Figure 4 As shown, the method and process of the present invention are described by using the 25-bar truss structure in the COMPASS example library.

[0052] Material constant: E=10 7 lbf / in 2 , μ=0.3, ρ=0.1lb / in 3

[0053] Sectional area of ​​all rod elements: A (0) =1.0in 2

[0054] Allowable stress: [σ]=±40000psi

[0055] Size limit: lower limit A (L) =0.01in 2 , upper limit A (U) =10.0in 2

[0056] Six sets of external loads: see Table 2

[0057] Table 2 Load Cases

[0058] Unit: lbf

[0059]

[0060] 1) Structural grouping processing: first divide the whole structure into 8 groups on MSC.PATRAN, each group contains several

[0061] Units and unit groupings are shown in Table 3. Form the finite element model 25.bdf.

[0062] Table 3 Grouping - Variables - Elements - List of Key Elements

[0063]

[0064]

[0065] 2) Model conversion: use the COMPASS conversion function to convert 25.bdf into the COMPASS input data file 25.cuf.

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Abstract

The invention discloses a structural probability optimized design method and belongs to the aviation structure optimized design field. According to the structural probability optimized design method, probability characteristics of a mean value and a variance of stress / strain are obtained due to processing of a stress / strain calculation result through a mathematical statics method based on the structural finite element analysis, then the size of the stress is confirmed according to a structural design requirement for reliability, and finally the structural optimized design is performed through a fully stressed / full strain method. According to the above processing methods, the structural design is improved greatly, the structural weight is reduced and the structural reliability is improved compared with an initial design, on one hand, the stress obtained through calculation through a probability method can show structural reliability requirement and is greatly improved compared with the deterministic analysis, and on the other hand, the weight is reduced and structural reliability is guaranteed confirming to requirements due to the design through the fully stressed / fully strain method.

Description

technical field [0001] The invention relates to a structural probability optimization design method, which belongs to the field of aviation structure optimization design. Background technique [0002] The optimization design of aircraft structure refers to optimizing the structural size parameters to improve the overall performance of the aircraft structure under the premise of satisfying the optimization objectives and constraints. Structural optimization design methods can be roughly divided into two categories: deterministic optimization and uncertain optimization, among which deterministic optimization is a method commonly used in engineering. [0003] At present, the deterministic optimization is carried out according to the structural strength specification. In order to consider the influence of random factors in the design process, the method of safety factor is used for processing, so that the safety of the structure can be guaranteed. This approach is generally con...

Claims

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Application Information

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IPC IPC(8): G06F17/50
Inventor 刘钢段世慧王立凯常亮
Owner 上海秦耀航空试验技术有限公司
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