接触网绝缘子泄漏电流在线监测装置设计

为有效地预测接触网绝缘子污秽水平,提高接触网运行安全可靠性,设计了一种基于ARM的接触网绝缘子泄露电流在线监测装置。通过传感器采集泄露电流和环境湿度预测绝缘子污秽水平,从而判断绝缘子是否应该进行清洗。选取了FQBJ—25/8—760P复合绝缘子为研究对象,在饱和空气湿度下,利用在线监测装置进行人工污秽实验。利用实验数据拟合污秽水平与泄漏电流的关系曲线,为确定接触网绝缘子泄漏电流在线监测装置的预警值提供指导。基于污闪发展三区段思想,提出接触网绝缘子安全运行区、污秽清理区及危险区。     

用改进的静电探头测量绝缘子表面电荷

设计了用于绝缘子表面静电荷的测量装置。得到了圆柱型绝缘子的表面电荷分布图。实验研究表明设计的电荷测量装置具有分辨力高、电荷泄漏少的优点。     

基于图像伺服的接触网绝缘子自动水冲洗车

目前铁路绝缘子维护领域内还没有自动水冲洗设备,本文提出了捕获跟踪与瞄准系统对绝缘子进行自动冲洗维护。在绝缘子识别的基础上,进一步设计出基于图像的视觉伺服系统(IBVS,Image-Based Visual Servoing)控制方法,调整冲洗水炮炮管及摄像机姿态对绝缘子进行瞄准,来完成绝缘子冲洗工作。该方法主要思路为写出特征函数的差并使其最小,特征函数是通过两个雅可比矩阵及其伪逆矩阵建立起图像与冲洗装置控制量之间的关系,最后达到控制目的。本文使用Matlab对IBVS控制方法进行验证,该方法控制双自由度冲洗装置精确性达到要求,可实现绝缘子冲洗瞄准。     

一种中压开关柜绝缘子泄漏电流在线监测装置的设计

介绍了一种中压开关柜绝缘子泄漏电流在线监测装置的设计方法,给出了装置总体设计方案,详细介绍了放大电路、滤波电路、信号调理电路及电磁兼容设计,并采用低电压作用下的等效阻容网络测试了该装置的性能。当装置输入4V左右正弦波时,输出电压为2.2～3.8V,输出电流为10～14mA,均满足设计要求,且电压和电流波形匹配良好;在一定的相移前提下,该装置的输出波形与实测波形基本一致,表明其能够实现中压开关柜绝缘子泄漏电流的在线监测功能。     

电网绝缘子等值附盐密度智能测试仪的研制

介绍了电网绝缘子等值附盐密度智能测试仪的研制,详细阐明了有关工作原理和设计关键。测试仪以AT89系列单片机89C52作为核心器件,利用其运算功能直接测量出绝缘子清洗液的等值附盐密度。对决定电网绝缘子的清扫周期,有效防止电网大面积污秽闪络事故的发生有明显的作用。     

融合PHOG和BOW-SURF特征的接触网绝缘子缺陷检测方法

绝缘子图像中存在的噪声对提取绝缘子细节纹理特征具有较大影响,单个特征描述子不能描述绝缘子的更多细节纹理特征,而提取到绝缘子细节纹理特征的多少直接影响了绝缘子缺陷检测的精度和速度.针对以上问题,提出改进快速导向滤波算法和融合PHOG与BOW-SURF特征来实现绝缘子缺陷的精确检测.首先,采用改进的快速导向滤波算法对接触网绝缘子原始图像进行滤波;然后,提取绝缘子滤波后图像的PHOG和BOW-SURF特征;最后,将两者融合后送入SVM分类器进行训练,实现绝缘子缺陷的检测.实验结果表明,该方法检测绝缘子缺陷的精度为100%,平均每张图像的处理时间为0.039s,为接触网悬挂状态检测监测装置对图像分析及缺陷检测奠定了必要的基础.     

对瓷支柱绝缘子振动声波探伤的探析

瓷支柱绝缘子在输电线路中主要起到绝缘和制成的作用,因此绝缘子自身质量直接关系到电力输送的安全性和稳定性。由于瓷支柱绝缘子长期暴露在外,工作环境较为恶劣,如果制作工艺不符合规范,就会导致绝缘子出现裂缝或者缺陷,从而造成安全隐患。因此,需要借助专业的仪器设备对绝缘子进行全方位系统的检测。本文组要分析振动声波探伤方法,通过分析完好绝缘子和含有缺陷绝缘子的振动波形图的特点,获取缺陷所在范围,也进一步验证了该方法对瓷支柱绝缘子探伤的可行性。     

绝缘子检测机器人运动控制系统设计

针对绝缘子检测机器人运动控制系统设计,讨论了系统组成,设计了绝缘子的检测机器人运动控制系统设计.改变了人工检测绝缘子劳动时间长,危险性高,检测效率低的现状.探讨了绝缘子检测机器人运动控制系统,设计了软件实现方法和流程;随着智能电网概念的提出和发展,一种可以替代人工进行绝缘子检测的机器人成为电力系统发展的需求.本文在设计了绝缘子自由移动的机器人,该机器人可搭载现有的检测设备,完成绝缘子串的零值检测任务.     

基于电磁波检测的高压低零值瓷绝缘子判别技术及应用

瓷质绝缘子因常年暴露在户外，容易受到雷击、雨雪、污闪的影响导致绝缘击穿而成为零值绝缘子。为优化提升零值绝缘子的损伤辨识精度，提出一种基于电磁波检测的高压零值绝缘子判别技术。利用磁天线阵列的方向性与组阵压缩磁天线感知信号空间，使磁天线屏蔽压缩空间外的噪声和干扰信号。设计宽频带磁天线采集系统，通过宽、窄频磁天线接收零值瓷绝缘子在高压状态下的放电电磁脉冲信号，利用FFT技术对采集信号进行数据处理，根据频谱波形的幅度波动即可判断被测绝缘子是否存在放电现象以及放电严重程度。现场实验印证了所提方法的有效性和实用性。     

高压架空输电线路绝缘子串抗风偏性能自动测试方法

为了提高高压架空输电线路绝缘子串抗风偏性能,需要进行高压架空输电线路绝缘子串抗风偏性能自动测试,提出一种基于防风偏智能分析数学建模的高压架空输电线路绝缘子串抗风偏性能方法,根据线路防风偏设计标准,参考设计风偏系数,结合架空输电线路绝缘子类型、绝缘子结构高度、绝缘子串、导线距杆塔最小电气安全距离等参数构建性能测试的约束参量模型,根据线路运行经验,进行防风偏智能分析数学模型设计,结合特征分析和智能算法对高压架空输电线路绝缘子串的抗风偏能力进行计算分析。结果表明,采用该方法能有效实现对高压架空输电线路绝缘子串抗风偏性能自动测试,计算结果准确可靠,提高了高压架空输电线路绝缘子串抗风偏性能,对架空输电线路绝缘子串的抗风性能参数的准确估计能力较好。     

Only connect: teaching, technology and telesis

Abstract This paper describes an approach to the design of interactive multimedia materials being developed in a European Community project. The developmental process is seen as a dialogue between technologists and teachers. This dialogue is often problematic because of the differences in training, experience and culture between them. Conditions needed for fruitful dialogue are described and the generic model for learning design used in the project is explained.     

European Community policy and the market

Abstract This paper starts with some reflections on the policy considerations and priorities which are shaping European Commission (EC) research programmes. Then it attempts to position the current projects which seek to capitalise on information and communications technologies for learning in relation to these priorities and the apparent realities of the marketplace. It concludes that while there are grounds to be optimistic about the contribution EC programmes can make to the efficiency and standard of education and training, they are still too technology driven.     

一种自适应子融合集成多分类器方法

融合集成方法已经广泛应用在模式识别领域,然而一些基分类器实时性能稳定性较差,导致多分类器融合性能差,针对上述问题本文提出了一种新的基于多分类器的子融合集成分类器系统。该方法考虑在度量层融合层次之上通过对各类基多分类器进行动态选择,票数最多的类别作为融合系统中对特征向量识别的类别,构成一种新的自适应子融合集成分类器方法。实验表明,该方法比传统的分类器以及分类融合方法识别准确率明显更高,具有更好的鲁棒性。     

Avoiding semantic and temporal gaps in developing software intensive systems

Development of software intensive systems (systems) in practice involves a series of self-contained phases for the lifecycle of a system. Semantic and temporal gaps, which occur among phases and among developer disciplines within and across phases, hinder the ongoing development of a system because of the interdependencies among phases and among disciplines. Such gaps are magnified among systems that are developed at different times by different development teams, which may limit reuse of artifacts of systems development and interoperability among the systems. This article discusses such gaps and a systems development process for avoiding them.     

Designing economic np control charts: A programmed simulation approach

This paper presents control charts models and the necessary simulation software for the location of economic values of the control parameters. The simulation program is written in FORTRAN, requires only 10K of main storage, and can run on most mini and micro computers. Two models are presented - one describes the process when it is operating at full capacity and the other when the process is operating under capacity. The models allow the product quality to deteriorate to a further level before an existing out-of-control state is detected, and they can also be used in situations where no prior knowledge exists of the out-of-control causes and the resulting proportion defectives.     

煤矿井下安全监控分站的设计及其仿真实现

为了设计一种具有低成本、低功耗、易操作、功能强且可靠性高的煤矿井下安全分站,针对煤矿安全生产实际,文章提出了采用MCS-51系列单片机为核心、具有CAN总线通信接口的煤矿井下安全监控分站的设计方案;首先给出煤矿井下安全监控分站的整体构架设计,然后着重阐述模拟量输入信号处理系统的设计过程,最后说明单片机最小系统及其键盘、显示、报警、通信等各个组成部分的设计;为验证设计方案的可行性与有效性,使用Proteus软件对设计内容进行仿真验证,设计的煤矿井下安全监控分站具有瓦斯、温度等模拟量参数超标报警功能和电机开停、风门开闭等开关量指示功能;仿真结果表明:设计的煤矿井下安全监控分站具有一定的实际应用价值.     

The development of robot art

Going through a few examples of robot artists who are recognized worldwide, we try to analyze the deepest meaning of what is called “robot art” and the related art field definition. We also try to highlight its well-marked borders, such as kinetic sculptures, kinetic art, cyber art, and cyberpunk. A brief excursion into the importance of the context, the message, and its semiotics is also provided, case by case, together with a few hints on the history of this discipline in the light of an artistic perspective. Therefore, the aim of this article is to try to summarize the main characteristics that might classify robot art as a unique and innovative discipline, and to track down some of the principles by which a robotic artifact can or cannot be considered an art piece in terms of social, cultural, and strictly artistic interest. This work was presented in part at the 13th International Symposium on Artificial Life and Robotics, Oita, Japan, January 31–February 2, 2008     

Explanation and prediction: an architecture for default and abductive reasoning

Although there are many arguments that logic is an appropriate tool for artificial intelligence, there has been a perceived problem with the monotonicity of classical logic. This paper elaborates on the idea that reasoning should be viewed as theory formation where logic tells us the consequences of our assumptions. The two activities of predicting what is expected to be true and explaining observations are considered in a simple theory formation framework. Properties of each activity are discussed, along with a number of proposals as to what should be predicted or accepted as reasonable explanations. An architecture is proposed to combine explanation and prediction into one coherent framework. Algorithms used to implement the system as well as examples from a running implementation are given.     

Three Process Perspectives: Organizations, Teams, and People

This paper provides the author's personal views and perspectives on software process improvement. Starting with his first work on technology assessment in IBM over 20 years ago, Watts Humphrey describes the process improvement work he has been directly involved in. This includes the development of the early process assessment methods, the original design of the CMM, and the introduction of the Personal Software Process (PSP)^SM and Team Software Process (TSP){^SM}. In addition to describing the original motivation for this work, the author also reviews many of the problems he and his associates encountered and why they solved them the way they did. He also comments on the outstanding issues and likely directions for future work. Finally, this work has built on the experiences and contributions of many people. Mr. Humphrey only describes work that he was personally involved in and he names many of the key contributors. However, so many people have been involved in this work that a full list of the important participants would be impractical.     

基于复小波噪声方差显著修正的SAR图像去噪

提出了一种基于复小波域统计建模与噪声方差估计显著性修正相结合的合成孔径雷达(Synthetic Aperture Radar,SAR)图像斑点噪声滤波方法。该方法首先通过对数变换将乘性噪声模型转化为加性噪声模型,然后对变换后的图像进行双树复小波变换(Dualtree Complex Wavelet Transform,DCWT),并对复数小波系数的统计分布进行建模。在此先验分布的基础上,通过运用贝叶斯估计方法从含噪系数中恢复原始系数,达到滤除噪声的目的。实验结果表明该方法在去除噪声的同时保留了图像的细节信息,取得了很好的降噪效果。