遗传算法在单层球壳质量优化中的应用

江季松 叶继红

振动与冲击 ›› 2009, Vol. 28 ›› Issue (7) : 1-7.

PDF(353 KB)
PDF(353 KB)
振动与冲击 ›› 2009, Vol. 28 ›› Issue (7) : 1-7.
论文

遗传算法在单层球壳质量优化中的应用

  • 江季松 叶继红
作者信息 +

Application of genetic algorithm in the section optimization of single layer dome

  • JIANG Ji Song YE Ji Hong
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文章历史 +

摘要

摘要: 经典遗传算法存在局部搜索能力不强,“早熟”现象和后期收敛速度放慢等缺陷,本文将自适应策略与“预选择机制”的小生境技术同时引入其中,加入小生境技术后可以避免陷入局部收敛的问题;在小生境遗传算法基础上加入自适应策略,实现对种群的杂交概率和变异概率进行自适应控制,从而形成一种改进小生境遗传算法,可以有效维持种群中个体的多样性,同时可以改善全局收敛的可靠性。通过三个典型算例验证了本文算法的正确性,并通过单层球壳的算例分析表明该方法稳定性好,全局搜索能力强,但在计算时间上长于ANSYS自带的优化模块。本文算法可以应用于优化变量繁多的大中型网壳结构截面优化问题,优化效果明显。

Abstract

Abstract: The classical genetic algorithm (GA) itself has the limitation of weakness local search ability,converging prematurely and reducing convergence speed in the anaphase. The theory of adaptive strategy and niche technique of pre-selection mechanism are introduced into the GA. Niche technique is used to avoid the problem of converging to the part-optimum. Adaptive strategy is presented for the adaptive controlling of the crossover probability and mutation probability. The new type of algorithm is adaptive niche genetic algorithm (ANGA),for the purpose of maintaining the population diversity and improving the reliability of holistic convergence. This algorithm is verified by three typical examples. Besides, a numerical case of 70m single-layer reticulated dome is given to demonstrate good operation steadiness and strong holistic searching capability,however the consuming time using proposed algorithm is longer than that using ANSYS optimistic built-in module. The algorithm can be applied to section optimization of large and medium reticulated dome with several optimum variables,and can ensure the quality of results.

关键词

遗传算法 / 小生境技术 / 自适应策略 / 单层球壳 / 截面优化

Key words

genetic algorithm / niche technique / adaptive strategy / single-layer reticulated dome / section optimization

引用本文

导出引用
江季松 叶继红. 遗传算法在单层球壳质量优化中的应用[J]. 振动与冲击, 2009, 28(7): 1-7
JIANG Ji Song YE Ji Hong. Application of genetic algorithm in the section optimization of single layer dome[J]. Journal of Vibration and Shock, 2009, 28(7): 1-7

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