共查询到19条相似文献,搜索用时 500 毫秒
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大部分复杂的塑料制品均采用注射成型生产。注塑制品质量的预测和制品质量的优化是注射成型过程中的重要步骤。人工神经网络(ANN)作为人工智能最常用的方法已经被应用到注射成型中,但是,仍存在训练成本较高、构建模型复杂等缺陷。ANN预测模型可以拟合注塑过程,并且,优化注塑制品质量。以工艺参数和过程参数作为输入数据的ANN预测模型不仅可以预测注塑制品质量,还可以结合智能优化算法优化注塑工艺参数。并且,对减少ANN预测模型训练成本的方法进行了综述。最后,总结了ANN预测模型在注塑制品优化中的进展和发展方向。 相似文献
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对三容液位系统的非线性复杂特点,利用RBF网络对系统建立预测模型,着重分析了RBF网络结构的选取、模型参数辨识以及网络优化的问题.通过预测函数控制验证了RBF网络模型在非线性系统建模中的优越性. 相似文献
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运用MoldFlow软件对把手零件的气辅注塑成型过程进行CAE分析,结合气辅成型原理优化了浇口、进气口的位置,总结了气辅CAE的工作流程,分析了各工艺参数对产品壁厚、气道长度的影响,并调整参数,得到了满足设计要求的制品。 相似文献
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以注射成型机箱壳为例,构建制品CAE分析模型,运用Moldfl ow仿真分析,预测制品缺陷,并选定了优化因素与指标;运用Taguchi试验法和CAE仿真获得数据样本,通过模糊加权综合评分将多目标问题转化为单目标优化;建立了BP神经网络集预测模型,映射了工艺参数与质量指标的非线性关系;采纳遗传算法进行全局寻优,得到试验范围内的最优工艺参数:模具温度为66.3℃,熔体温度为227℃,填充时间为4.6 s,保压压力为填充压力的109%,保压时间为10.2 s,冷却时间为22.7 s。对优化结果进行CAE分析验证,结果表明,神经网络预测结果与CAE模流分析结果相近,实现了制品质量指标的多目标优化。该优化设计方法能有效提高制品质量,缩短生产周期。 相似文献
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本文结合国内外对气辅成型工艺的研究。比较了气辅成型和传统的注射成型成型制件的优缺点。通过讨论在气辅成型过程中,熔体预注射量、气体延迟时间和气体压力等工艺参数对制品性能的影响,揭示了影响制品性能的内在因素取向机理在气辅成型和传统的注射成型成型的不同及气辅成型技术研究发展的趋势。 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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Melt index (MI) is considered as one of the most significant parameter to determine the quality and the grade of the practical polypropylene polymerization products. A novel ICO‐VSA‐RNN (RBF neural network with ICO‐VSA algorithm) MI prediction model is proposed based on radial basis function (RBF) neural network and improved chaos optimization (ICO), and variable‐scale analysis (VSA), where the ICO is first added and then combined with the VSA to overcome the defects of ICO and VSA, then the parameters of the RBF neural network are optimized with them. At last, the RBF neural network model for MI prediction model is developed. Further researches on the optimal RBF neural network model of MI prediction are carried out with the data from a real industrial plant, and the prediction results show that the performance of this prediction model is much better than the RBF neural network model without optimization. © 2012 Wiley Periodicals, Inc. J Appl Polym Sci, 2012 相似文献
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Melt index (MI) is a crucial indicator in determining the product specifications and grades of polypropylene (PP). The prediction of MI, which is important in quality control of the PP polymerization process, is studied in this work. Based on RBF (radial basis function) neural network, a soft‐sensor model (RBF model) of the PP process is developed to infer the MI of PP from a bunch of process variables. Considering that the PP process is too complicated for the RBF neural network with a general set of parameters, a new ant colony optimization (ACO) algorithm, N‐ACO, and its adaptive version, A‐N‐ACO, which aim at continuous optimizing problems are proposed to optimize the structure parameters of the RBF neural network, respectively, and the structure‐best models, N‐ACO‐RBF model and A‐N‐ACO‐RBF model for the MI prediction of propylene polymerization process, are presented then. Based on the data from a real PP production plant, a detailed comparison research among the models is carried out. The research results confirm the prediction accuracy of the models and also prove the effectiveness of proposed N‐ACO and A‐N‐ACO optimization approaches in solving continuous optimizing problem. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2010 相似文献
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基于RBF神经网络的制浆蒸煮终点预测模型 总被引:1,自引:1,他引:0
为稳定纸浆质量,实现蒸煮终点的精确预测,建立基于RBF网络的终点预测模型,通过与BP模型的比较,可知基于RBF网络的蒸煮终点预测模型具有较好的快速性及准确性. 相似文献