电动机故障诊断专家系统研究

通过对电动机故障分析，主要研究了产生式电动机故障诊断专家系统的总体结构，知识获取，知识库建立及推理机制。     

一种新型桥路型HTSFCL的实验研究

在研究一种新型桥路型高温超导限流器的限流原理的基础上，研制开发了一台三相600V、故障电流峰值100A的实验室样机．本文介绍了该限流器的功率电路、控制器、低温容器和高温超导磁体等部分的结构特点和功能．在三相系统中进行了各种短路故障限流实验，结果表明该限流器有较强的限流能力和重合闸能力，说明新型高温超导限流器的研究对改善电网动态性能和提高电网电能质量有十分重要的意义．     

基于加强型BP算法的神经网络故障诊断研究

文章给出了利用神经网络进行故障诊断的可行性、基本原理、诊断过程分析、和参数优化过程 ,并得出较为理想的诊断结果 .     

New Approach to Model Validation and Fault Diagnosis

The paper presents a new approach to model validation and fault diagnosis problems for a class of uncertain systems in which the uncertainty is described by an integral quadratic constraint. The new approach is developed by applying methods from linear quadratic optimal control theory. This leads to a method for model validation and fault diagnosis which is based around a robust Kalman filter type structure.     

基于布尔偏导数的组合电路双故障检测的新方法

分析了布尔偏导数与布尔差分的关系，给出了基于布尔偏导数的组合电路双故障测试集的方程，引入了奇集合的概念．在此基础上提出了基于布尔偏导数的组合电路双故障检测的新方法．实例表明该方法具有思路清晰、操作简单及易于掌握的优点．     

PLS: A versatile tool for industrial process improvement and optimization

Modern industrial processes are characterized by acquiring massive amounts of highly collinear data. In this context, partial least‐squares (PLS) regression, if wisely used, can become a strategic tool for process improvement and optimization. In this paper we illustrate the versatility of this technique through several real case studies that basically differ in the structure of the X matrix (process variables) and Y matrix (response parameters). By using the PLS approach, the results show that it is possible to build predictive models (soft sensors) for monitoring the performance of a wastewater treatment plant, to help in the diagnosis of a complex batch polymerization process, to develop an automatic classifier based on image data, or to assist in the empirical model building of a continuous polymerization process. Copyright © 2008 John Wiley & Sons, Ltd.     

A stochastic theory for clustering of quenched-in vacancies—2. A solvable model

The model introduced for clustering of quenched-in vacancies in the first part of this series of papers is considered. Using a generating function, the rate equations are converted into a first order partial differential equation for the generating function coupled to a differential equation for the rate of change of the concentration of single vacancy units. A decoupling scheme is effected which gives an exponentially decaying solution with a very short time constant for the concentration of single vacancy units. The differential equation for the generating function is solved for times larger than the time required for the concentration of single vacancy units to reach its asymptotic value. The distribution for the size of the clusters is obtained by inverting the solution thus obtained. Several results that follow are shown to be in reasonably good agreement with the experimental results.     

连通无向图Rabin数的一个界

可靠性和有效性是互连网络设计的重要标准,而Rabin数是度量网络容错性和传输延迟的重要参数.将通过图的容错直径给出2- 连通无向图和~3- 连通无向图的~Rabin 数r_2(G)和r_3(G)的界;同时也得到r_2(G) = D_2(G)成立的一个条件.     

混沌状态下永磁同步发电机的故障诊断——LMI法研究

本文以永磁同步风力发电机为研究对象, 在两相同步旋转坐标系下建立了永磁同步发电机的数学模型. 应用时间尺度和线性仿射变换建立了系统混沌模型, 验证了系统在某些参数和工作条件下会出现混沌运动. 随后在考虑系统不确定性的情况下设计了故障观测器, 在系统发生故障时, 通过所设计的故障观测器能对混沌状态下永磁同步发电机的故障做出准确估计. 仿真结果表明基于线性矩阵不等式方法的故障观测器能够对系统故障做出快速准确的诊断. 关键词： 永磁同步发电机 混沌 非线性不确定系统 故障诊断     

饱和铁芯型超导限流器对距离保护的影响

饱和铁芯型超导限流器SCFCL(Saturated Core Superconducting Fault Current Limiter)是一种较为理想的高电压限流器,利用其技术特点可以实现无时限的明显限流作用,有着广泛的运用前景。距离保护能够很好的满足高电压复杂网络快速、精确切除故障的要求,其主要元件阻抗继电器是现阶段普遍应用的高性能继保装置。SCFCL在高压输电网络的接入会对距离保护产生很大影响,运用PSCAD搭建500kV输电线路模型,详细分析限流器接入前后不同短路故障类型及故障距离对线路距离保护的影响。