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Topology optimization method of annular tensioning integral structure based on niche genetic algorithm

A technique for tensioning the overall structure and topology optimization. It is applied in the fields of genetic laws, calculations, and genetic models. It can solve the problems of local convergence and easy premature convergence, and achieve the effect of strong versatility and low steel consumption.

Active Publication Date: 2019-01-22
ZHEJIANG UNIV
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Problems solved by technology

The disadvantage of the traditional genetic algorithm is that it is easy to converge prematurely, that is, it is easy to fall into local convergence and other problems.

Method used

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  • Topology optimization method of annular tensioning integral structure based on niche genetic algorithm
  • Topology optimization method of annular tensioning integral structure based on niche genetic algorithm
  • Topology optimization method of annular tensioning integral structure based on niche genetic algorithm

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Experimental program
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Embodiment Construction

[0042] The flow chart of the main function of the genetic algorithm is as follows: figure 1 , the specific steps are described as follows:

[0043] 1) Use 0-1 codes to represent the topological relationship of population individuals, take the total mass of the ring-tensioned overall structure as the value of the objective function, construct a linear fitness function through the objective function, and adjust the fitness function through niche technology to ensure that the population diversity; set various parameters, including the number of individuals in each generation NIND, the binary digit PRECI of variables, the generation gap GGAP, which is the ratio of the number of newly generated individuals in the offspring to the total number of individuals, and the way in which newly generated individuals in the offspring are recombined and mutated and probability, the upper and lower limits of genetic algebra, that is, the maximum number of iterations MAXGEN, the initial iteratio...

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Abstract

The invention discloses a topology optimization method of an annular tensioning integral structure based on a niche genetic algorithm. According to the determined span, the equivalent fraction and thenumber of joints per segment of the annular tensegrity structure model, with the topological relationship as the control variable, the minimization of the total mass of the annular tensioned structure as the control objective, and with the prestress as the whole feasible, the shaped bar as the non-crossing, the load stress control and the displacement limit as the constraint conditions, the nichetechnology is combined, the optimal solution of the topological relationship is searched. The invention can optimize the topology of an annular tensioning integral structure with arbitrary span, arbitrary equal fraction and arbitrary number of nodes in each section, and has the advantages of strong universality and low steel quantity in the obtained result.

Description

technical field [0001] The invention belongs to the field of structural topology optimization, and relates to a topology optimization method applied to a ring-tensioned overall structure. Background technique [0002] The existing cable dome structure is supported by reinforced concrete ring beams or ring steel trusses, which cannot be self-balanced, so strictly speaking, it is not a real tensegrity structure. If the existing cable dome can be improved, a ring-shaped tensegrity structure is used as the ring beam of the cable dome, and the tension-integral ring and the cable dome structure interact to form a co-working whole, which can generate a real "tensile whole". The fully self-balancing cable dome not only avoids the use of bulky concrete or steel structure ring beams, but also provides the possibility for the cable dome structure to be fabricated on the ground, ultimately reducing the construction period and cost. Therefore, the research on the overall structure of an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50G06N3/12
CPCG06N3/126G06F30/17
Inventor 袁行飞谢胜达马烁吴桐
Owner ZHEJIANG UNIV
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