共查询到20条相似文献,搜索用时 78 毫秒
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针对武器‐目标火力分配问题,建立了基于效能最大和用弹量最少的多目标优化模型。基于 Pareto集非劣分层思想对遗传算法进行改进,利用非劣分层遗传算法处理武器‐目标分配多目标优化问题。非劣分层遗传算法通过对种群内的所有个体的多个目标函数进行非劣分层排序来度量个体的适应能力,通过遗传算法实现多样性进化操作,能够获取Pareto最优解集,以供决策者参考。仿真试验表明:该方法能够获得满意的分配结果,方便快捷地解决多平台多类型武器‐目标分配问题。 相似文献
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一种自适应伪并行改进遗传算法 总被引:1,自引:0,他引:1
针对基本遗传算法中存在的一些不足,例如"早熟"现象和计算速度较慢等缺点,对进化算子作一定的改进,在单台计算机上实现并行计算思想与遗传算法的结合,提出了一种新的伪并行改进遗传算法.最后通过典型测试函数的数值算例验证,表明该算法不但有效地克服了遗传算法的缺点,而且精度和收敛速度都有明显的提高. 相似文献
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多目标遗传算法在水面船舶快速性优化设计中的应用 总被引:2,自引:0,他引:2
李学斌 《江苏科技大学学报(社会科学版)》2008,22(5)
在船舶设计中,船、机、桨的匹配问题一直是设计人员最关注的问题之一.快速性良好的船舶应使得船、主机和螺旋桨之间的性能综合匹配.通过采用改进的非支配解排序的多目标遗传算法,讨论了船舶概念设计阶段快速性优化问题.以推进系统综合效率和排水量为优化目标,考虑了混合变量的多目标优化问题.文中给出了载重量为35000t油船的快速性优化设计例子.结果表明,多目标遗传算法能够快捷搜索到全局最优解. 相似文献
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基于免疫遗传算法的水下无人平台航路规划 总被引:2,自引:2,他引:0
为克服遗传算法在水下无人平台航路规划应用中存在的问题,提出了基于免疫遗传算法的水下航路规划问题.仿真结果表明,这种算法能够有效地提高航路规划的计算速度和保证航路规划的质量. 相似文献
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标准遗传算法的研究进展 总被引:1,自引:0,他引:1
讨论了标准遗传算法在解决各种复杂问题时存在的缺陷,总结了相应的解决方案,并阐述了这些方案的实现原理,最后简单介绍了几种改进的遗传算法. 相似文献
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本文采用多目标遗传算法求解船舶出坞拖轮配置优化模型的近似Pareto最优解集,针对遗传算法只能优化单目标、无约束问题,通过引入罚函数除去了船舶出坞中多变量非线性有约束问题的约束限制。本文利用加权和方法处理船舶出坞拖轮装置多目标优化问题,并按专家决策方法确定各目标函数的权系数。拖轮配置优化结果表明了多目标遗传算法的有效性,并为船坞主管进行船舶出坞拖轮配置决策提供了充分的依据。 相似文献
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介绍了我国港口资源的整合现状,指出港口整合可以提升港口的形象和地位,也为区域经济和城市的发展注入强大的动力。最后指出在港口资源整合中要避免的几个问题。 相似文献
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广州集装箱码头的轮胎式场桥小车制动器使用10多年后,出现了许多问题,故进行了改造.分析了轮胎式集装箱龙门起重机小车制动器的主要故障现象,提出了改造方案,并加以实施. 相似文献
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本文对现有的选定球面轴承的三种工程方法进行了分析比较.引入了“合力系数”,并给出了合力方向上投影面积的精确解. 相似文献
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分析柴油机故障中常见的机体裂纹故障原因,认为由于设计缺陷和管理及操作不当,易造成船舶柴油机缸体上的裂纹多发生在气缸套凸肩处。如不及时处理这些裂纹和故障,就会造成缸套的裂纹直至出现缸套漏水等严重后果,针对NANTAIQUEEN轮柴油机对该类型故障的检修提出具体措施。 相似文献
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The hydrophysical and hydrochemical structure of the Sea of Azov, with developed bottom anoxia, was studied during the RV “Akvanavt” cruise from July 31 to August 03, 2001. The anoxic zone with a thickness from 0.5 to 4 m above the bottom was found in all deep regions of the Sea. Concentrations of hydrochemical parameters were similar to the pronounced anoxic conditions (about 90 mmol m− 3 of hydrogen sulfide, 17 mmol m− 3 of ammonia, 6 mmol m− 3 of phosphate, 7 mmol m− 3 of total manganese). The hydrophysical structure was characterized by the uniform distribution of temperature in the upper 6–7 m mixed layer (UML). Below this a thin (0.4–0.8 m) thermocline layer was observed, just above the anoxic waters. Formation of this phenomenon was connected with that summer weather conditions. Intensive rains led to increased influx of river waters in June. That resulted in large input of allochtonous organic matter (OM) and inorganic nutrients; the latter were consumed on the additional autochthonous organic matter production. In July the weather was characterized by a significant rise in the daily averaged air temperature and large oscillations of temperature during the day. In this period a wind of constant direction was absent, but wind bursts were observed. The completed analyses showed that the formation of such a structure could be connected with the following factors: (i) positive growth trends of the daily averaged temperature and the daily oscillations of temperature, (ii) presence of wind bursts. The joint action of these factors resulted in the formation of the UML. The amplitude of wind bursts determined the depth of UML, and the value of trend determined the value of the temperature change in the thermocline. An initial presence of bottom halocline (caused by the Black Sea water influx to the bottom of the Sea of Azov) prevented the heating of the bottom layer and therefore led to an increase of vertical gradient of temperature in the thermocline. The spatial distribution of the turbulent exchange coefficient confirmed the existence of a “stagnation” area located above the anoxia zone, which is also, apparently, the reason for its occurrence. 相似文献
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