遗传算法在单层球壳质量优化中的应用.pdfVIP

遗传算法在单层球壳质量优化中的应用 江季松 叶继红 （东南大学土木工程学院，南京 210096 ） （东南大学混凝土结构及预应力混凝土结构教育部重点实验室，南京 210096 ） 摘要: 经典遗传算法存在局部有哪些信誉好的足球投注网站能力不强，“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，全局有哪些信誉好的足球投注网站能力强，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。 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 中图分类号：TU311.41 文献标识码：A Application of genetic algorithm in the section optimization of single layer dome JIANG Ji Song YE Ji Hong (School of Civil Engineering, Southeast University, Nanjing 210096) (Key Laboratory of Concrete and Pre-stressed Concrete Structures of Ministry of Education, China) 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 optimisti