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A genetic neural fuzzy system (GNFS) is presented and introduced to quality prediction in the injection process. A hybrid-learning algorithm is proposed, which is divided into two stages to train GNFS. During the first learning stage, the genetic algorithm is used to optimize the structure of GNFS and the membership function of each fuzzy term because of its capability of parallel and global search. On the basis of the first optimized training stages, the back-propagation algorithm (BP algorithm) is adopted to update the parameters of the GNFS to improve its predicting precision and reduce the computation time. The process of constructing a quality prediction model for an injection process based on GNFS is described in detail. The predicted weight of the molded part from the model based on GNFS demonstrates that the proposed GNFS has superior performance and good generalization capability in quality prediction in the injection process. 相似文献
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神经网络遗传算法及其在乙烯裂解过程预测中的应用研究 总被引:3,自引:0,他引:3
针对复杂神经网络模型的结构特性和BP网络梯度下降法的缺点,将遗传算法与神经网络相结合,提出了基于改进连续化遗传算法的神经网络学方法,并将其应用于大型乙烯裂解产品分布预测,获得了较好的过于模拟结果。 相似文献
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基于BP神经网络的陶瓷裂纹釉釉面效果预测模型及应用 总被引:1,自引:0,他引:1
人工神经网络具有巨量并行、结构可变和高度非线性等特点,其建立数学模型并不需要预先知道太多有关问题背景的知识,这尤其适用于陶瓷釉研究中某些机理尚未完全清楚、传统数学方法无法分析的情况[1]。将人工神经网络技术用于裂纹釉的配方性能分析,以釉面裂纹为研究对象,选取了8种釉料的化学成分,在均匀实验设计的基础上,用BP人工神经网络对所得实验结果进行了分析,并且用图形化方式直观地表达了出来。根据实验结果,人工神经网络模型能较准确地预测出陶瓷的釉面效果,从而为研究裂纹釉提供了一种新的思路和有效手段。 相似文献
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ABSTRACT The concept of modelling using a rules -based approach is introduced and developed for die prediction of the quality degradation of grains during hot air drying. It is men validated on two typical examples of quality degradation during drying: the head kernel yield of paddy rice and the wet-milling quality of maize. The linguistic approach gives a representation of die experts understanding of phenomena and leads to a good kinetic model after identification of die parameters using genetic algorithms. This study also points out die robustness of die model prediction, even if noisy data are used, and its ability to predict transient behaviours under certain conditions. 相似文献
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介绍注塑企业生产中的辅助设备一中央供料、干燥系统及其组成,如中央控制器、除湿干燥机、真空泵、上料机和色母计量机等。指出将中央供料、干燥系统应用于塑料加工业,可改善塑料制品质量,提高生产效率,节省人力和占地面积。对注塑企业的厂房规划和中央供料、干燥系统的设计提出一些建议。 相似文献
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在对动态神经网络结构分析的基础上,提出了新的网络结构模式,把具有同类特性的输人参数集中在一个节点上以代表该类参数的性质、产生这类参数对网络的综合作用。这样构造的更合乎逻辑的神经网络的权值总数要比传统的BP网络的权值总数大大减少,从而加快网络学习速度,有利于网络的在线学习和提高网络的可靠性与稳定性。此外,本文对神经网络逆动态控制器进行了分析,提出在输入层增加系统偏差作为一个输入变量,从而增强了控制器的控制质量和控制反应能力。最后,应用上述技术对CSTR典型化工实例进行了验证,取得了较好的结果。 相似文献
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讨论了一种基于专家知识的智能 P I D控制算法。根据专家知识与现场经验,实时修正 P I D 参数,并根据系统响应的在线识别进行知识调整。两个具有明显非线性时变特性对象的仿真结果表明,该算法具有良好的控制特性与鲁棒性,可望被改进为一种实时在线的计算机控制策略而加以实施。 相似文献
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S. S. Madaeni N. Tavajohi Hasankiadeh H. R. Tavakolian 《Chemical Engineering Communications》2013,200(3):399-416
Robust artificial neural network (ANN) and fuzzy logic (FL) models were derived for chemical cleaning of microfiltration membranes fouled by milk under a wide range of operating conditions. The accuracies of the models were compared with multiple linear regressions (MLR). The developed models are useful tools for predicting the performance of chemical cleaning. The effects of different operating conditions on cleaning performance were elucidated using the ANN developed model. Moreover, optimum cleaning condition was determined by genetic algorithm and ANN model. The current research demonstrated that fuzzy logic and an artificial neural network can quantitatively capture cumulative effects of a range of operating conditions on flux recovery and resistance removal during a cleaning process. 相似文献
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针对K型合成氨厂工艺流程,借鉴低温变换反应器还原系统的工艺思路,充分利用现有设备,对高温变换炉升温流程进行改造,将低温变换还原系统与高温变换炉工艺管线相连接,实现高温变换炉单独升温,节省开工时间25h。 相似文献
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讨论了聚丙烯在注射成型中充模、增密、保压、冷却各个阶段的压力变化情况和熔体流动过程,以及二者对制品成功质量的影响。认为在聚丙烯注射成型过程中,要保证制品成型质量,不应以升温的办法来降低熔体的粘度,而应以提高注塑压力和剪切速率为主。 相似文献
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介绍塑料注射成型工艺中影响制品质量的主要工艺以 和成型质量的评价方法,以及注射工艺CAE的特点与最新发展,并举例说明采用流动模块技术对于模具结构设计和工艺参数优化配置的指导作用。 相似文献