检索结果-南通市图书馆

2010 3rd IEEE International Conference on Computer Science and Information Technology—ICCSIT 2010

作者： Cui Haoyang School of Computer Science and Information engineering shanghai university of electric power shanghai china School of Communication and Information engineering shanghai university shanghai china Hangzhou Qianjiang River Electic Group Co. Ltd.Hangzhou china Tang Zhong School of Computer Science and Information engineering shanghai university of electric power shanghai china Fang Yong School of Communication and Information engineering shanghai university shanghai china Liu Jun Hangzhou Qianjiang River Electic Group Co. Ltd.Hangzhou china Ye Bo School of Computer Science and Information engineering shanghai university of electric power shanghai china

This paper presents a fault diagnosis method for power *** diagnosis plays an importance role in the efforts for transformer diagnosis to shift form "preventive maintenance"to"condition based maintenance"（CBM）,and consequently to reduce the maintenance *** since its birth,numerous techniques have been researched in this field,each method however,has its own advantages and *** diagnosis is a challenging problem because there are numerous fault situations that can possibly happen to a electrical *** is one of the most importance parameters for the diagnosis of electrical transformers fault *** on the appearance information of temperature,a fault monitoring system can make diagnosis intelligently,therefore it can provide a rapid scientific treatment options for the field *** the problem of transformer fault diagnosis based on temperature information,we use Bayesian probability density theory method to explain the equipment fault diagnosis *** maximum membership probability principle will be adapted to judge whether the equipment is *** results shows that when the working temperature is between 64～72 oC,the diagnosis results without compensation is working on normal state,while the diagnosis results with compensation is general fault ***,the diagnosis results without compensation have large error with the actual *** proposed methodology in this paper was testified having important significance in improving the reliability and the information level of transformer operation.

关键词： transformers Bayesian probability density theory fault diagnosis

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

水冷壁高温腐蚀机制及机器人检测技术

引用

上海交通大学学报 2008年第S1期42卷 93-96页

作者：吕学勤刘刚郑小霞吴毅雄上海电力学院信控系上海200090 上海交通大学材料科学与工程学院上海200240

阐述了锅炉水冷壁发生高温腐蚀的机制与条件,介绍了用于火力发电站的锅炉水冷壁检测机器人的发展情况,以及各种爬壁机器人的本体结构、磁路设计及控制系统等。由此得出水冷壁检测机器人能够缩短作业周期、提高电站的经济效益、降低劳动... 详细信息

阐述了锅炉水冷壁发生高温腐蚀的机制与条件,介绍了用于火力发电站的锅炉水冷壁检测机器人的发展情况,以及各种爬壁机器人的本体结构、磁路设计及控制系统等。由此得出水冷壁检测机器人能够缩短作业周期、提高电站的经济效益、降低劳动强度并提高检测精度.

关键词：水冷壁高温腐蚀爬壁机器人

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Esearch of Chaos in Marine electric power System

Esearch of Chaos in Marine Electric Power System

引用

ICEMI'2005第七届国际电子测量与仪器学术会议

作者： Shi Weifeng (department of electrical Automation shanghai Maritime university shanghai 200135 china)

Linking with marine electric power system practicality, a mathematic model of two generators parallel connective operation of electric power network in light load state was established and researched.

关键词： Marine electric power system chaos Lyapunov exponent chart Lyapunov dimension chaos distinguish.

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

IMAGE FUSION BASED ON NONSUBSAMPLED CONTOURLET TRANSFORM

IMAGE FUSION BASED ON NONSUBSAMPLED CONTOURLET TRANSFORM

引用

2009 International Conference on Environmental Science and Information Application Technology

作者： LIU GANG1 LIN XUEHUI2 QIAN HONG1 HUANG GUOHONG3 1 (shanghai university of electric power shanghai Key Laboratory of power Station Automation Technology shanghai university of electric power shanghai china 200090) 2 (Shenyang Bright engineering Co. Ltd. Shenyang Liaoning china 110002) 3 (Dept.of Information Guangdong university of Technology Guangzhou 510006 china)

Image fusion is the process of generating a single combined image,which contains a more accurate description of the scene than the multiple images from different *** approaches have been developed for the combination of complementary information coming from input images in order to create a new image where the informative content is more suitable for human visual or machine *** Contourlet Transform（NSCT）can realize a flexible multiscale,multidirection,and shift-invariant image *** a result,when NSCT is introduced to image fusion,more information and better characteristics from the original images for fusion could be *** this paper,NSCT is proposed when different registered source images are *** with two distinct modes of fusion method in low-frequency and in high-frequency separately,the fused image will be obtained by inverse *** with the fusion method based on wavelet and other fusion methods,the experiments show that this approach can achieve better results than them.

关键词： Image Fusion Nonsubsampled Contourlet Transform Salience/Match Measure

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

ECONOMIC LOAD DISPATCH BASED ON HYBRID EVOLUTIONARY ALGORITHM AND FUZZY NUMBER RANKING METHOD

ECONOMIC LOAD DISPATCH BASED ON HYBRID EVOLUTIONARY ALGORITH...

引用

第11届国际模糊系统协会世界大会

作者： Guoli Zhang Gengyin Li Hong Xie Jianwei Ma department of Applied Mathematics North china electric power university Baoding 071003 china. department of Electronic engineering shanghai Maritime university shanghai 200135 china

＜正＞ In this paper we propose a new economic load dispatch model considered cost function coefficients with uncertainties and the constraints of ramp rate. The uncertain parameters are represented with fuzzy numbers, and the model is called fuzzy dynamic economic load dispatch model （FDELD）. A novel hybrid evolutionary algorithm and fuzzy number ranking method is proposed to solve FDELD problem. Hybrid evolutionary algorithm combines evolutionary algorithm with very strong global search ability and quasi-simplex technique with better local search capability. The fuzzy number ranking method is used to compare the fuzzy cost function values when optimizing fuzzy cost function. In addition, this paper gives a novel method dealing with directly constrained conditions, and it is not necessary to construct penalty function, as a common disposal constraints method. The experimental study shows that FDELD is practical and the algorithm and techniques proposed are very efficient to solve FDELD problem.

关键词： Economic load dispatch Evolutionary algorithm Quasi-simplex technique Fuzzy number ranking Constraint disposal method

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

配电系统多重故障的负荷转移策略研究

引用

水电能源科学 2010年第7期28卷 150-152,109页

作者：沈健上海交通大学电子信息与电气工程学院电气工程系上海200125

通过改进染色体编码和寻优规则,提出了一种基于遗传算法并结合启发式规则的有效算法,用于解决配电系统发生多重故障时寻求负荷转移优化方案这一多目标问题,求解过程中考虑了辐射型网络结构参数配置及馈线额定电流等因素。以虚拟配电网... 详细信息

通过改进染色体编码和寻优规则,提出了一种基于遗传算法并结合启发式规则的有效算法,用于解决配电系统发生多重故障时寻求负荷转移优化方案这一多目标问题,求解过程中考虑了辐射型网络结构参数配置及馈线额定电流等因素。以虚拟配电网络发生多重故障的算例验证了该算法的有效性。

关键词：配电系统多重故障负荷转移策略研究 Distribution Systems Multiple Strategy 基于遗传算法染色体编码启发式规则多目标问题有效算法优化方案系统发生网络结构求解过程配电网络额定电流参数配置有效性

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

同轴旋转分层流燃烧器空气动力场的数值模拟

引用

水动力学研究与进展（A辑） 2004年第2期19卷 213-218页

作者：吴江陈启峰章明川范卫东高茂尹斌上海交通大学机械与动力工程学院

　同轴旋转分层流燃烧器运用离心力分层原理,对一、二次风混合进行有效控制,达到分级燃烧,抑制NOx生成的目的。由于离心力的作用,同轴旋转分层流燃烧器的湍流脉动是各向异性的,这使得基于各向同性假设的k ε模型不再适用。本文运用作者... 详细信息

　同轴旋转分层流燃烧器运用离心力分层原理,对一、二次风混合进行有效控制,达到分级燃烧,抑制NOx生成的目的。由于离心力的作用,同轴旋转分层流燃烧器的湍流脉动是各向异性的,这使得基于各向同性假设的k ε模型不再适用。本文运用作者提出的考虑离心力影响的k ε模型(k ε cf模型),对流项采用混合差分格式,对同轴旋转分层流燃烧器空气动力特性进行了数值模拟,将数值预报与实验测定进行了比较,得到了较好的结果。

关键词：同轴旋转分层流燃烧器旋转射流数值模拟湍流模型离心力方程离散边界条件

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

利用改进的可控串联补偿潮流计算模型研究电网最大输电能力

引用

上海交通大学学报 2009年第11期43卷 1823-1827页

作者：张轶胡百林张焰李端超上海交通大学电子信息与电气工程学院上海200240 安徽省电力公司合肥230022

基于电力市场环境下的频繁输电交易将对电网最大输电能力(TTC)提出更高要求,研究了可控串联补偿(TCSC)对提高电网TTC的重要作用,改进并建立了TCSC潮流计算模型和计及TCSC的电网TTC计算模型.采用基于灵敏度的反复线性迭代算法,以IEEE-14... 详细信息

基于电力市场环境下的频繁输电交易将对电网最大输电能力(TTC)提出更高要求,研究了可控串联补偿(TCSC)对提高电网TTC的重要作用,改进并建立了TCSC潮流计算模型和计及TCSC的电网TTC计算模型.采用基于灵敏度的反复线性迭代算法,以IEEE-14和IEEE-30节点系统为例进行仿真计算.结果表明,该模型是有效的.

关键词：电力网最大输电能力可控串联补偿潮流计算

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Effects of Annealing Temperature on the electrical Conductivity and Mechanical Property of Cu-Te Alloys

引用

Journal of Wuhan university of Technology(Materials Science) 2007年第1期22卷 88-90页

作者：朱达川 Metallic Material department College of Material Science and Engineering Sichuan University

The effects of annealing temperatre on the electrical conducitivity and mechanical property of Cu-Te alloys were studied via an AG-10TA electronic universal machine, an SB2230 digital electric bridge, SEM, EDS and XPS. The results show the electrical conductivity increases while the tensile strength fluctuates when the annealing temperature becomes higher because the recrystallization occurs during the annealing process, leading to the density of dislocation decreasing, grain size growing up, but the second phase precipitating sufficiently and simultaneously.

关键词： Cu-Te alloys annealing temperature recrystallization

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Acoustic impedance characteristics of linear compressors

引用

Journal of Zhejiang university-Science A(Applied Physics & engineering) 2013年第7期14卷 494-503页

作者： Zhi-hua GAN Long-yi WANG Sheng-ying ZHAO Yu-jing SONG Wei-wei WANG Yi-nong WU Institute of Cryogenics and Refrigeration Zhejiang University School of Information and electrical engineering Zhejiang University City College shanghai Institute of Technical Physics Chinese Academy of Sciences

The acoustic field of a linear compressor serves to deliver the compression work to the load, such as the connected cold head of a cryocooler; it plays an equivalently important role as the electrical and mechanical parts, especially in the impedance match issue. This paper studies the acoustic impedance characteristics of a linear compressor. The parameters including the current, the piston displacement, the pressure amplitude, the electrical power dissipation, the power factor, the pressure-volumetric (PV) power delivered, and the efficiency are theoretically and experimentally investigated. Different from previous theoretical studies, optimization for the operations away from the resonance is also included. More general optimization results imply relevance between thermoacoustic engines and linear compressors. The predicted results are validated by the experiments performed on a linear compressor with an adjustable resistive-capacitive (RC) acoustic load. The comparisons between the calculations and the measurements are presented and analyzed. The results provide deeper insight into the mechanism of the linear compressor and the impedance match in a cryocooler system.

关键词： Linear compressor Acoustic impedance Resistive-capacitive (RC) load

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：