多维参数线性经验 Bayes 估计的一致收敛速度

在多维参数模型下,本文构造了一个线性经验 Bayes 估计,并证明出其一致收敛速度为1。     

在线拉曼光谱仪在芳烃装置中的应用及荧光背景处理

介绍了在线拉曼光谱仪在芳烃PX装置的使用情况,并且针对传统的拉曼光谱预处理方法不能很好地解决现场使用中产生的荧光背景干扰问题,提出了基于小波变换的在线拉曼光谱信号预处理方法.试验结果表明:将小波变换应用到拉曼光谱谱图数据预处理中,能够较好地减弱荧光背景干扰,从而提高在线拉曼光谱仪的分析精度和模型稳定性.     

氧化锌避雷器在线监测技术及应用

介绍氧化锌避雷器在线监测技术的原理,通过该技术在石家庄供电公司的应用实例,验证其能够及时发现氧化锌避雷器的缺陷,并提出该技术的推广应用的建议.     

Linear regression analysis for fuzzy input and output data using the extension principle

The method for obtaining the fuzzy least squares estimators with the help of the extension principle in fuzzy sets theory is proposed. The membership functions of fuzzy least squares estimators will be constructed according to the usual least squares estimators. In order to obtain the membership value of any given value taken from the fuzzy least squares estimator, optimization problems have to be solved. We also provide the methodology for evaluating the predicted fuzzy output from the given fuzzy input data.     

含不可观变迁事件图的状态估计器设计

针对基于事件图建模的离散事件系统中存在的不可观变迁的状态估计问题,本文提出前向、后 向可观路径的概念对其进行了详细分析,并给出一种估计器设计方法,用来根据关联矩阵行变换进行不可观 变迁状态的估计．分析了估计器的观测代价,在此基础上给出了寻找最优估计器的方法,并利用最优估计器 计算不可观变迁的状态估计范围．最后通过实例证明了该方法能够有效地进行不可观变迁的状态估计．     

破碎流程故障诊断系统开发与应用

破碎流程故障诊断系统以破碎生产流程在线检测数据为支撑,将因果推理和主元分析等技术相融合,实现了从底层设备到中间工序,再到上层生产流程的3层架构破碎全流程生产过程在线监测和故障诊断功能。该系统可以及时发现潜在的生产异常或者故障,通过报警、调整操作参数、甚至停机等方式处理异常或者故障,保障生产的持续稳定运行。     

Runtime data‐based characterization and torque estimation of switched reluctance motors

High‐performance control of a switched reluctance (SR) motor strictly requires an accurate nonlinear motor model as well as an appropriate control strategy. Since recent modeling methods are either complex or not accurate enough, this paper focuses on overcoming such drawdacks. An experimental method is proposed to collect useful data for modeling a 6/4 SR motor at running condition. Nonlinear modeling is done by an algorithm, which also enables simple static torque computation. The algorithm presents not only the static torque data but also an estimator model for instantaneous torque estimation during real‐time operation, which is very important for most torque control strategies. The nonlinear model is experimantally tested, and its accuracy verified. © 2013 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.     

Identification of nonwoven uniformity using generalized Gaussian density and fuzzy neural network

A joint method to identify nonwoven uniformity by combining wavelet transform, generalized Gaussian density (GGD) and generalized dynamic fuzzy (GDF) neural network is presented in this paper. Six hundred and twenty‐five nonwoven images of five different grades, 125 images of each grade, are decomposed at three different levels with coif4 wavelet base. Wavelet coefficients in each subband are independently modeled by GGD model, while the scale and shape parameters of that are extracted as input features of GDF neural network. For comparison, two energy‐based features are also extracted from wavelet coefficients directly, the number of which is the same as the scale and shape parameters estimated from GGD model with maximum likelihood (ML) estimator. Experimental results on the 625 nonwoven images indicate the GGD model parameters are more expressive and powerful in characterizing textures than the energy‐based ones. The proposed method has high identification accuracy, such as when the images are decomposed at Level 3 and described with GGD model parameters, the identification accuracies of five grades are all 100%. Additionally, to reduce the redundancy of the generated fuzzy rules, an effective complementary approach, fuzzy rule base reduction based on ‘CityBlock’ distance is proposed.     

水轮发电机组汽蚀在线监测的应用

汽蚀是水轮机运行中最为常见的故障之一,严重时会直接危及机组的安全运行.因此,对水电机组汽蚀进行在线监测十分必要.文中介绍了水轮发电机组汽蚀在线监测的原理和实现方法,提出了具体的汽蚀在线监测系统结构设计方案.系统的主要原理是:通过在水轮发电机组指定位置上安装的传感器,采集伴随汽蚀产生的一些特殊信号,再通过适当的算法辨别处理,将这些信号中与汽蚀有关的信息提取出来,分析出其与汽蚀程度的对应关系,从而通过监测这些信息达到监测汽蚀情况的目的,为水电厂开展状态检修进行了有益的探索.     

标准喷嘴板脉冲萃取柱脉冲振幅的在线测量

实验考察了5个标准喷嘴板脉冲萃取柱系统在吹气条件下脉冲振幅与柱重瞬间正弦信号1个周期峰面积之间关系。实验结果表明：在吹气条件下,峰面积与脉冲频率无关;流道因子随着脉冲振幅和脉冲频率增加而增大,与脉冲萃取柱柱高、柱径和连续相密度无关。在此基础上,获得了吹气法在线测量脉冲振幅的经验关联式。 