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Truss structure robust design size optimization method based on Info-Gap decision

A truss structure and robust design technology, applied in the field of truss structures, can solve problems that are difficult to meet the needs of actual projects, and achieve the effects of stable convergence results, good feasibility and operability

Inactive Publication Date: 2016-10-12
CHANGAN UNIV
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Problems solved by technology

Therefore, the oversimplified deterministic optimization model used in optimization design is often difficult to meet the needs of actual engineering

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  • Truss structure robust design size optimization method based on Info-Gap decision

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Embodiment Construction

[0074] Specific embodiments of the present invention will be described in detail below.

[0075] Such as figure 1 As shown, an Info-Gap decision-based robust design size optimization method for truss structures includes the following steps:

[0076] (1) Establish an optimization model for robust design of truss structures

[0077] (2), start external optimization

[0078] Initialize the truss model parameters, material parameters and loading conditions, and determine the critical performance r c , and then initialize the design variable q in the feasible space;

[0079] (3) Start internal optimization

[0080] Initialize the uncertain variable u;

[0081] (4) Perform structural analysis with the design variable q obtained in step (2) and the uncertainty variable u obtained in step (3), and calculate the performance function R(q,u), whose expression is as follows:

[0082] R(q,u)≤r c (4-1), where:

[0083] R is the performance function,

[0084] q represents the desig...

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Abstract

The present invention relates to a truss structure robust design size optimization method based on Info-Gap decision, comprising (1) establishing an optimization model for truss structure robust design; (2) starting external optimization; (3) starting internal optimization; (4) performing structure analysis according to an obtained design variable q and an obtained uncertainty variable u, and calculating a performance function R(q, u); (5) updating the uncertainty variable u; (6) returning the step (4), repeating the steps (4) to (5) until reaching the maximum iteration number of the internal optimization, and entering a step (7); (7) outputting the most unfavorable performance R(q, u) currently satisfying a critical performance condition and the corresponding uncertainty variable u, and then entering a step (8); (8) updating the design variable q, and then entering a step (9); (9) returning the step (3), repeating the steps (3) to (8) until reaching the maximum iteration number of the external optimization, and entering a step (10); and (10) outputting a current robustness function alpha-hat and corresponding optimal sectional areas A of rod members.

Description

technical field [0001] The invention belongs to the technical field of truss structures, and in particular relates to an Info-Gap decision-making method for robust design size optimization of truss structures. Background technique [0002] The load uncertainty is one of the uncertainties that have the greatest impact on the structural system. Compared with the deterministic optimal design method, the truss structure obtained by the robust optimal design method considering the load uncertainty can better resist the change of external load. The technical difficulty of the robust design method for truss structures under uncertain loads is how to accurately and efficiently calculate the mean and standard deviation of the compliance of truss structures under given uncertain loads and the sensitivity of the objective function to design variables. [0003] If in the optimization of the truss structure, the coordinates of the structural nodes, the connection relationship of the memb...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/13G06F30/367
Inventor 许锐程辉李寻昌马安锋邹愈
Owner CHANGAN UNIV
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