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论述了遗传算法,优化设计及神经网络的耦合技术,以压力注浆机的主控制参数和为样本,采用这种合技术,实际工程参数转化为遗传进化样本,再通过优化技术变成最优样本,来训练神经网络系统,旨在提高控制参数质量。 相似文献
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探讨样本优胜劣汰技术——遗传算法,阐述种源样本的生成技术、工程参数及配方内容的编码方法、样本的优劣筛选、交配、变异和繁殖优生后代技术,旨在供陶瓷工作者掌握此技术,引用于陶瓷配方及陶瓷装备的设计工作. 相似文献
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《化学工业与工程技术》2015,(5):76-81
综述了国内外电化学耦合氧化法的主要研究进展,其中包括与光催化法、Fenton法、超声氧化法、膜法等先进氧化处理难降解有机物技术的耦合,并指出电化学氧化与其他氧化技术耦合在不同程度上都具有协同作用。最后提出了电化学氧化耦合工艺实现工业化的研究方向应以高效电极的研制、最优参数的探索以及耦合反应的反应器设计为重点。 相似文献
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制冷系统由于内部物质形态的多样性以及系统参数间的高度耦合而较为复杂,也增加了出现故障后的检测及诊断难度。针对制冷系统常见的7种故障,包括局部故障与系统故障,运用主元分析法提取故障样本主要特征,对样本进行降维处理后,基于概率神经网络进行故障诊断。主元分析法可将原始的62个参数分解为相互独立的主元,根据累计贡献率选取一定量的主元,并将其样本输入概率神经网络进行故障诊断,结果表明结合主元分析后的概率神经网络在一定范围内对spread值不敏感,不仅诊断正确率有所提高,而且缩短了诊断耗时。可见,主元分析法的使用可有效优化概率神经网络的诊断性能。 相似文献
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以高含盐高COD染色废水为处理对象,研究新型的炭膜与三维电极耦合技术对其降解过程.通过对比三维电极工艺,考察了炭膜与三维电极耦合技术降解高含盐高COD染色废水的优越性,并研究了反应器参数对耦合技术处理效果的影响.结果表明,电极间距1.0cm,电流密度30 mA·cm-2,反应时间4 h,石墨玻璃珠混合物为粒子电极时,炭膜与三维电极耦合技术可将废水COD从4514mg·L-1下降到1050mg·L-1,COD去除率达到77%,对比三维电极电解过程,COD去除率提高34.2%.试验证明炭膜与三维电极耦合处理高含盐高COD染色废水是可行的集成技术. 相似文献
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多晶硅生产中三氯氢硅精馏节能工艺 总被引:1,自引:0,他引:1
简述了多晶硅行业概况和差压耦合蒸馏节能技术。详述了一种高纯三氯氢硅差压耦合精馏工艺,利用高压塔塔顶蒸汽作为低压塔塔釜再沸器热源,实现了能量的集成与过程优化。运用化工模拟软件PRO/Ⅱ8.1模拟了两塔高纯三氯氢硅差压耦合精馏工艺和三塔高纯三氯氢硅差压耦合精馏工艺的设计参数。结果显示,两塔耦合三氯氢硅一次收率为92.0%,理论节能50.1%;三塔耦合三氯氢硅一次收率为92.0%,理论节能66.7%,效果更好。该技术已成功实现工业化,可使精馏单元实际能耗平均降低40%~60%,同时大幅减少了设备投资。 相似文献
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针对火电厂主汽温被控对象的不确定性及大延迟、大惯性及非线性等特点,设计一种基于免疫遗传算法、BP神经网络和RBF神经网络的智能PID控制系统.利用免疫遗传算法的全局搜索寻优能力和较好的收敛性优化神经网络的权值,同时利用BP网络对PID参数进行在线调整.仿真结果表明,该系统在控制品质、鲁棒性方面都明显优于常规PID控制系... 相似文献
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针对注塑产品容易产生翘曲和缩痕的问题,以某检测仪外壳为研究对象,运用RBF神经网络模型和遗传算法,对注塑成型质量进行控制与预测。基于正交试验方案,运用Moldflow有限元分析软件获得试验结果;利用样本数据建立试验因素与响应值之间的RBF神经网络模型,并用最优拉丁超立方抽样技术,获得样本点对模型精度进行检验;运用带精英策略的非支配排序遗传算法(NSGA-Ⅱ)对注塑成型工艺参数进行多目标优化,达到有效控制和预测翘曲变形、体积收缩率和缩痕指数的目的,并经模拟和试模验证误差较小。结果表明,运用RBF神经网络模型和遗传算法对注塑成型质量进行控制与预测,生产出检测仪外壳最大翘曲变形量为0.394 mm,外观无缩痕。 相似文献
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基于BP神经网络和改进遗传算法的蒸发器支座结构优化设计 总被引:2,自引:0,他引:2
应用显著性分析选取了优化结构参数,利用正交试验法和有限元法确定了神经网络样本数据,建立了反映结构特性的人工神经网络模型,为遗传算法提供了适应度函数,并通过改进遗传算法完成了函数优化。对比和分析结果表明,优化结构比初始结构的体积减少了19.9%,失稳临界载荷提高了293%,且满足强度条件。 相似文献
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以挤出吹塑中空制品品质(制品壁厚分布、制品质量)和生产效率为最终的优化目标,成型工艺参数为设计变量,基于混合人工神经网络和遗传算法建立了挤出吹塑中空成型工艺参数的多目标优化系统。此方法不仅可确定满足实际生产需要的初始成型工艺参数,减少用于确定初始成型工艺参数的时间,而且为挤出吹塑中空成型的工艺参数的确定提供了理论依据,为挤出吹塑中空成型生产的全自动化的实现奠定了基础。 相似文献
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建立了基于神经网络和遗传算法并结合正交试验的薄壳件注塑成型工艺参数优化系统。正交试验法用来设计神经网络的训练样本,人工神经网络有效的创建了翘曲预测模型;遗传算法完成了对影响薄壳塑件翘曲变形的工艺参数(模具温度、注射温度、注射压力、保压时间、保压压力和冷却时间等)的优化,并计算出了它们的优化值。按该参数进行试验,效果良好,可以有效地减小薄壳塑件翘曲变形,其试验数值与计算数值基本相符,说明所提出的方法是可行的。 相似文献
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Recent research in automobile exhaust catalysts has addressed the substitution of platinum-group metals Pt, Pd and Rh by metals such as Cu, Co, Ag, Zn, Mn and Sr exchanged or impregnated on zeolites, TiO2 or Zro2 carriers. These catalysts have the potential of becoming good alternatives to the commercial three-way catalysts to convert pollutant hydrocarbons (HC), carbon monoxide (CO) and nitrogen oxides (NOx). This paper describes a technique based on neural networks, to correlate the catalyst synthesis variables and resulting exhaust conversion. The optimum catalyst composition and operating conditions for a specified exhaust conversion are determined
A back-propagation algorithm was used to train the feed-forward neural network consisting of two hidden layers with 45 and 60 neurons in the first and second hidden layers respectively, with optimum values of the learning factor and momentum gain coefficient. The effects of the operating and compositional parameters on NOx conversion by Cu-ZSM-5 were found. The optimum conversion was predicted for Si/Al atom ratio in the range 30-35, Cu-loading (in Cu-ZSM-5) of 1·1 - 1.2% of the zeolite weight, and an operating temperature of 650-675 K. The rare-earth metals (Ce, Cs and La) that act as promoters for three-way catalysts did not have a considerable effect on the exhaust conversion. The conversion increased by at least 10% when Co is used as a co-cation in Cu-ZSM-5. 相似文献
A back-propagation algorithm was used to train the feed-forward neural network consisting of two hidden layers with 45 and 60 neurons in the first and second hidden layers respectively, with optimum values of the learning factor and momentum gain coefficient. The effects of the operating and compositional parameters on NOx conversion by Cu-ZSM-5 were found. The optimum conversion was predicted for Si/Al atom ratio in the range 30-35, Cu-loading (in Cu-ZSM-5) of 1·1 - 1.2% of the zeolite weight, and an operating temperature of 650-675 K. The rare-earth metals (Ce, Cs and La) that act as promoters for three-way catalysts did not have a considerable effect on the exhaust conversion. The conversion increased by at least 10% when Co is used as a co-cation in Cu-ZSM-5. 相似文献
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Anca-Stefania Mesaros Sorina Sava Delia Mitrea Cristina Gasparik Camelia Alb Michaela Mesaros 《Journal of Adhesion Science and Technology》2013,27(20):2256-2279
Esthetic dentistry imposes several demands on the artistic abilities of the dentist, and knowledge of the underlying scientific principles of tooth color is considered to be essential by Sikri. The supervised classification methods, such as the artificial neural networks, the support vector machines, and also the Bayesian classifier, and the feature selection methods, such as decision trees, genetic algorithms and neural networks, as well as independent component analysis combined with least square support vector machines, were applied successfully in the medical field but were less implemented in the dental analysis domain. This study was conducted on extracted premolars from people who required orthodontic treatment. Data gathering was done using spectrophotometric recordings of tooth color parameters before and after accelerated bleaching, staining, and control procedures on extracted teeth on which was simulated orthodontic treatment. Comparison between data mining techniques and classical statistical interpretation of data was done. The results demonstrated the usefulness of these innovating data assessment techniques in the dental field. 相似文献