基于模糊聚类的模糊神经网络的系统辨识

本文采用基于模糊聚类的模糊神经网络模型对系统进行辨识,首先利用模糊聚类技术来确定系统的模糊空间和模糊规则数,然后利用模糊神经网络来调整模型的前件参数和后件参数。用此设计方法对函数逼近问题进行仿真,结果表明利用聚类技术可以获得较好的初始值,学习速度快、建模精度高。     

高炉异常炉况的模糊预测模型

将神经网络和模糊数学理论相结合，建立了一种新型的炉况预报模型，利用模糊神经网络的并行处理特性进行模糊推理。模糊神经网络的并行数学计算过程取代了专家系统中传统的参数处理，具有更高的推理效率；且神经网络的学习能力实现了隶属函数和模糊规则的自学习，从而满足了高炉专家系统知识库的动态特征，有效提高了炉况预报模型的自适应能力。最后，应用莱钢1号高炉在线采集的数据动态模拟了高炉炉况的变化趋势。     

基于神经网络的水厂原水水质的综合评价

基于BP神经网络的改进算法,提出了以Matlab 7.0为平台的算法程序的人工神经网络水质评价模型。参照《地表水环境质量标准》(GB3838-2002),确定神经网络学习和训练的样本并确定了模型的相应参数。以连云港市海州水厂原水取水口水质数据为样本,进行水质综合评价分析。与单因子评价法和模糊综合评价法进行了比较,结果表明神经网络模型所获得的结果更加客观、合理。     

热轧机有限元与神经网络集成建模

以某钢厂1580热连轧生产数据为基础,提出一种有限元与神经网络集成建模的方法.该方法首先对轧制过程的塑性变形进行有限元建模,然后结合有限元数值分析方法和智能技术的优点,实现有限元和神经网络的集成建模.集成模型中的神经网络模型为有限元模型提供参数调整的依据,并且在神经网络训练过程中使用改进的混沌粒子群优化算法对神经网络进行优化.通过与现场实际生产数据进行比较,验证了该模型的有效性.     

基于T-S模糊神经网络模型的高炉铁水温度预测建模

 针对高炉炉温与铁水硅含量呈正相关而非严格的线性关系和机制建模的主观性以及其难以建立各变量之间隐含的数学关系等的不足,在数据挖掘理论的基础上,对海量的样本数据进行预处理和特征提取,然后以高炉铁水温度为研究对象,建立了基于T-S模糊神经网络的高炉铁水温度预测模型。最后,应用某高炉数据进行模型验证,并将该模型与T-S模糊多元回归模型以及BP神经网络模型进行比较研究,仿真结果表明T-S模糊神经网络模型的有效性和优越性。     

石油企业财务风险评价神经网络模型的建立

石油企业财务风险评价是石油行业的重要课题.在确立石油企业财务风险评价指标体系的基础上,建立了基于模糊神经网络的石油企业财务风险评价模型.该评价模型分为模糊量化模块和模糊神经网络(FNN)模块,可根据实际问题进行具体调节,具有学习的功能.经过对200多家石油企业的实证分析,结果表明该模型网络预测误差小,是一种可靠、有效的企业财务风险评价模型.     

基于模型迁移方法的回转窑煅烧带温度软测量

回转窑的煅烧带温度是其控制过程中一个非常重要的参数,但煅烧带温度难以直接获取并且缺少大量的实测数据进行软测量.为了在数据较少的情况下获得准确的软测量模型,并考虑到窑头温度与煅烧温度的相似性,引入了基于过程相似性进行模型迁移的方法(PMBPS),首先采用混沌混合学习算法训练T-S模糊神经网络,对具有大量准确测量值的窑头温度建模,然后用PMBPS算法对窑头温度模型进行规划修正,获得煅烧带温度的软测量模型.仿真验证了所提出的软测量建模方法的有效性.     

一种新的模糊系统建模方法研究与应用

基于聚类技术和一类模糊神经网络,提出一种新的自动生成模糊系统规则库的设计方法.通过结构辨识(原始数据聚类得到模糊规则数)和参数辨识(RBF网络优化参数)方法,构造模糊系统完善的模糊规则库.通过对丙烯腈收益率问题及函数逼近问题的仿真,说明了该方法具有规则数目少、学习速度快、建模精度高等特点.     

基于神经网络的真空感应炉终点钢水温度预报

针对真空感应炉生产过程中温度测量成本较高及精度较差等不足,建立了基于RBF神经网络的真空感应炉终点钢水温度预报模型。对输入参数作了详细的分析、筛选,并运用聚类算法对该模型进行了训练。结合现场数据进行了学习和预报,预报命中率较高,表明采用该方法可很好地预报钢水温度。     

基于减法聚类的带钢厚度数据驱动建模

针对轧钢生产中大批过程数据没有被用于提高厚度质量的现象,提出了一种基于减法聚类的带钢厚度数据驱动在线建模方法.首先通过减法聚类将输入空间划分为一些小的局部空间,在每个局部空间中用最小二乘支持向量机建立子模型,子模型加权输出作为带钢厚度的离线模型;然后当在线数据不断增加时,通过在线减法聚类算法实时调整局部空间,子模型的参数采用最小二乘支持向量机的递推算法进行相应的在线辨识,子模型的预测输出作为模型的最后输出.实验结果表明,该方法具有良好的预测精度和较强的在线学习能力.     

Monitoring the blast furnace process using neural networks and knowledge‐based system

To assist the daily control of blast furnace operation, models for diagnosing the irregular process status and for predicting the cool furnace thermal state have been developed. The diagnostic model consists of two sub‐models. One is for evaluation of the various aspects of the process status based on fuzzy logic. The other is for the detection of the occurrence of channelling in the furnace based on neural networks. Tests using the actual process data have shown that the former sub‐model can promptly detect the existing abnormal process status and give warnings of irregular process statuses, e.g. abnormal permeability of burden, high heat fluxes, etc. The latter sub‐model can successfully extract the characteristic data patterns from a large amount of process data in connection with the occurrence of channelling and detect the existing channelling. For appropriately depicting the furnace thermal state, a thermal index and characteristic patterns of cool furnace thermal state have been derived using fuzzy logic and neural networks. Accordingly, two neural network models were designed for predicting the cool furnace thermal state. Either thermal index or characteristic patterns can be used to represent the cool furnace thermal state. Either model can be used to predict the upcoming cool furnace thermal state.     

ANN and Fuzzy Logic Models for Simulating Event-Based Rainfall-Runoff

This study presents the development of artificial neural network (ANN) and fuzzy logic (FL) models for predicting event-based rainfall runoff and tests these models against the kinematic wave approximation (KWA). A three-layer feed-forward ANN was developed using the sigmoid function and the backpropagation algorithm. The FL model was developed employing the triangular fuzzy membership functions for the input and output variables. The fuzzy rules were inferred from the measured data. The measured event based rainfall-runoff peak discharge data from laboratory flume and experimental plots were satisfactorily predicted by the ANN, FL, and KWA models. Similarly, all the three models satisfactorily simulated event-based rainfall-runoff hydrographs from experimental plots with comparable error measures. ANN and FL models also satisfactorily simulated a measured hydrograph from a small watershed 8.44?km2 in area. The results provide insights into the adequacy of ANN and FL methods as well as their competitiveness against the KWA for simulating event-based rainfall-runoff processes.     

Using Soft Computing to Analyze Inspection Results for Bridge Evaluation and Management

The national bridge inventory (NBI) system, a database of visual inspection records that tallies the condition of bridge elements, is used by transportation agencies to manage the rehabilitation of the aging U.S. highway infrastructure. However, further use of the database to forecast degradation, and thus improve maintenance strategies, is limited due to its complexity, nonlinear relationship, unbalanced inspection records, subjectivity, and missing data. In this study, soft computing methods were applied to develop damage prediction models for bridge abutment walls using the NBI database. The methods were multilayer perceptron network, radial basis function network, support vector machine, supervised self-organizing map, fuzzy neural network, and ensembles of neural networks. An ensemble of neural networks with a novel data organization scheme and voting process was the most efficient model, identifying damage with an accuracy of 86%. Bridge deterioration curves were derived using the prediction models and compared with inspection data. The results show that well developed damage prediction models can be an asset for efficient rehabilitation management of existing bridges as well as for the design of new ones.     

基于改进模糊ART神经网络的连铸漏钢预报模型

在模糊ART神经网络的基础上,有机结合模糊模式识别和模糊聚类算法,并通过引入新的学习机制和优化网络结构,建立了改进的新型模糊ART神经网络模型;同时,结合某钢厂连铸现场采集的历史数据,将该模型应用于连铸漏钢预报过程中。其结果表明,该模型对粘结漏钢过程中2种典型温度模式的预报率分别达到95.6%和97.8%,报出率都达到100%,且在避免漏报的同时保证了较低的误报率,能准确识别典型的温度模式和预测拉漏事故的发生。     

基于改进模糊ART神经网络的连铸漏钢预报模型

在模糊ART神经网络的基础上,有机结合模糊模式识别和模糊聚类算法,并通过引入新的学习机制和优化网络结构,建立了改进的新型模糊ART神经网络模型;同时,结合某钢厂连铸现场采集的历史数据,将该模型应用于连铸漏钢预报过程中。其结果表明,该模型对粘结漏钢过程中2种典型温度模式的预报率分别达到956%和978%,报出率都达到100%,且在避免漏报的同时保证了较低的误报率,能准确识别典型的温度模式和预测拉漏事故的发生。     

ANFIS模型在围岩稳定性分类中的应用

将模糊理论和人工神经网络理论相结合,建立了一种自适应神经模糊推理系统(ANFIS),应用于地下工程围岩稳定性分类.并根据收集到的围岩分类资料作为样本来训练和测试网络模型.预测结果表明,该模型能较好地用于地下硐室围岩分类.     

Thickness and Shape Synthetical Adjustment for DC Mill Based on Dynamic Nerve-Fuzzy Control

Due to the complexity of thickness and shape synthetical adjustment system and the difficulties to build a mathematical model, a thickness and shape synthetical adjustment scheme on DC mill based on dynamic nerve-fuzzy control was put forward, and a self-organizing fuzzy control model was established. The structure of the network can be optimized dynamically. In the course of studying, the network can automatically adjust its structure based on the specific questions and make its structure the optimal. The input and output of the network are fuzzy sets, and the trained network can complete the composite relation, the fuzzy inference. For decreasing the off-line training time of BP network, the fuzzy sets are encoded. The simulation results indicate that the self-organizing fuzzy control based on dynamic neural network is better than traditional decoupling PID control.     

Cloud Neural Fuzzy PID Hybrid Integrated Algorithm of Flatness Control

In connection with the characteristics of multi-disturbance and nonlinearity of a system for flatness control in cold rolling process, a new intelligent PID control algorithm was proposed based on a cloud model, neural network and fuzzy integration. By indeterminacy artificial intelligence, the problem of fixing the membership functions of input variables and fuzzy rules was solved in an actual fuzzy system and the nonlinear mapping between variables was implemented by neural network. The algorithm has the adaptive learning ability of neural network and the indetermi- nacy of a cloud model in processing knowledge, which makes the fuzzy system have more persuasion in the process of knowledge inference, realizing the online adaptive regulation of PID parameters and avoiding the defects of the traditional PID controller. Simulation results show that the algorithm is simple, fast and robust with good control performance and application value.     

模糊贝叶斯网络应用于预测高炉铁水含硅量变化趋势

贝叶斯网络在高炉铁水含硅量预测中已取得较好效果.本文的进一步改进是利用模糊逻辑方法能很好地将数据分成离散模糊集的优势,对模型参数进行有效的模糊分类,以此作为贝叶斯网络的输入,进行混合建模.对山东莱钢1号高炉智能控制专家系统在线采集数据进行计算证明,对一般高炉混合模型可提高预测命中率到90%.