粗糙集-BP网络在锌产量预测中的应用

提出了基于粗糙集与改进的BP网络的密闭鼓风炉锌产量预测模型,这样可以根据预测结果调整参数,来达到锌产量的最大化。首先运用粗糙集方法,在不改变训练样本分类质量的条件下,按照属性相对于决策表的重要度的大小,对输入参数集进行约简,确定神经网络输入层变量和神经元个数,再采用基于Levenberg-Marquardt方法的BP神经网络进行预测,仿真结果表明,该方法减少了网络的训练时间,改善了学习效率,具有较高的预测精度,是可行的、有效的。

基于SPSS与BP网络的锌产量预测模型

金属锌对人们的生活具有非常重要的意义,为了使锌产量最大化,有必要对密闭鼓风炉铅锌熔炼操作参数进行优化,提出了基于SPSS与BP网络的密闭鼓风炉熔炼锌产量的预测模型;先对DCS系统上获得的在线数据建立初步的参变量与锌产量之间的因果关系,再利用SPSS统计分析软件中的主成分分析法对各参变量进行分析,最后将得到的与锌产量最相关的少数几个因素用BP网络建立预测模型,仿真结果表明,该方法减少了网络的训练时间,改善了学习效率,具有较高的预测精度,是可行的、有效的。

On-line forecasting model for zinc output based on self-tuning support vector regression and its application

An on-line forecasting model based on self-tuning support vectors regression for zinc output was put forward to maximize zinc output by adjusting operational parameters in the process of imperial smelting furnace. In this model, the mathematical model of support vector regression was converted into the same format as support vector machine for classification. Then a simplified sequential minimal optimization for classification was applied to train the regression coefficient vector α- α* and threshold b. Sequentially penalty parameter C was tuned dynamically through forecasting result during the training process. Finally, an on-line forecasting algorithm for zinc output was proposed. The simulation result shows that in spite of a relatively small industrial data set, the effective error is less than 10% with a remarkable performance of real time. The model was applied to the optimization operation and fault diagnosis system for imperial smelting furnace.