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electrical and Optical Properties of GaSe Thin Films

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Journal of Materials Science & Technology 1997年第4期13卷 299-301页

作者： M. Ohyama(Dept. of electrical engineering, Tokyo National College of Technology, Tokyo, Japan) Dept. of electrical engineering Tokyo National College of Technology Tokyo Japan

The structure, electrical transport, and optical properties of GaSe films fabricated by means of radio-frequency (RF) magnetron sputtering in Ar were investigated. The as-sputtered GaSe films were amorphous, and their optical energy gap Eg are 1.9～2.6 eV. The effect of the synthesis conditions on the optical and electrical properties of the GaSe films has also been studied

关键词： Thin GaSe electrical and Optical Properties of GaSe Thin Films

Research on dual-stator winding multi-phase high-speed induction generator with rectifier load

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Science China(Technological Sciences) 2008年第6期51卷 683-692页

作者： WANG XiangHeng1 & WU XinZhen2 1 Department of electrical engineering, Tsinghua University, Beijing 100084, China 2 Department of electrical engineering, Qingdao University, Qingdao 266071, China Department of electrical engineering Tsinghua University Beijing China Department of electrical engineering Qingdao University Qingdao China

Based on analysis and calculation of the relation between current harmonics and MMF harmonics in the dual-stator winding multi-phase high-speed induction gen-erator with a rectifier load, a new idea, which divides the generator system into two sub-systems to be analyzed individually, is presented. For the sub-system of the 12-phase power winding with a rectifier load, the loop current method is used to establish network equation set in terms of the network graph theory. The numerical stability problem is solved by alternating use of fixed time-step and varied time-step, and the voltage and current with their fundamental components of the power winding are obtained. For the other sub-system of the induction generator with dual-stator winding and solid cage rotor, the electromagnetic field analysis method and the multi-variable optimization approach are combined to get the con-trol winding current and stator frequency. Calculated results well match experiment results, indicating that the new proposed method is of effectiveness and high ac-curacy.

关键词： dual-stator winding induction generator rectifier load MMF analysis loop current method finite element method optimization approach

Design,analysis and control of hybrid excited doubly salient stator-permanent-magnet motor

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Science China(Technological Sciences) 2010年第1期53卷 188-199页

作者： ZHU XiaoYong1,2 & CHENG Ming1 1 engineering Research Center for Motion Control of MOE,School of electrical engineering,Southeast University,Nanjing 210096,China 2 School of electrical and Information engineering,Jiangsu University,Zhenjiang 212013,China engineering Research Center for Motion Control of MOE School of Electrical Engineering Southeast University Nanjing China School of electrical and Information engineering Jiangsu University Zhenjiang China

In this paper,a new hybrid excited doubly salient stator-permanent-magnet motor is proposed,where both permanent magnets and DC field windings are located in the *** theory,the mathematical model and design method of the motor are *** corresponding output power equation and the relationship between the flux control capability and the extended speed range are deduced in *** using an efficient "one-step" three-dimensional(3D) finite element method,the electromagnetic performances are analyzed,in which the leakage flux outside the stator circumference and end-effect are taken into *** on the operation principle of the motor,the control strategy and scheme are developed and implemented *** experimental results and finite element analysis show that the proposed motor not only maintains the advantages of doubly salient permanent magnet motors,but also offers high energy efficiency over a wide speed range,which makes the motor an interesting candidate for electric vehicles.

关键词： stator permanent magnet motor hybrid excitation doubly salient finite element method flux weakening control

EXTRAPOLATING METHOD IN PLOT FOR FATIGUE LIFE PREDICTION OF COMPONENTS

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中国有色金属学会会刊：英文版 1996年第3期6卷 153-156页

作者： Liu Yilun Wang Ailun(College of mech.nical and electrical engineering,Central South University of Technology, Changsha 410083) College of mech.nical and electrical engineering Central South University of Technology Changsha 410083 China

ＥＸＴＲＡＰＯＬＡＴＩＮＧＭＥＴＨＯＤＩＮＰＬＯＴＦＯＲＦＡＴＩＧＵＥＬＩＦＥＰＲＥＤＩＣＴＩＯＮＯＦＣＯＭＰＯＮＥＮＴＳ￥ＬｉｕＹｉｌｕｎ；ＷａｎｇＡｉｌｕｎ（ＣｏｌｌｅｇｅｏｆＭｅｃｈａｎｉｃａｌａｎｄＥｌｅｃｔ... 详细信息

ＥＸＴＲＡＰＯＬＡＴＩＮＧＭＥＴＨＯＤＩＮＰＬＯＴＦＯＲＦＡＴＩＧＵＥＬＩＦＥＰＲＥＤＩＣＴＩＯＮＯＦＣＯＭＰＯＮＥＮＴＳ￥ＬｉｕＹｉｌｕｎ；ＷａｎｇＡｉｌｕｎ（ＣｏｌｌｅｇｅｏｆＭｅｃｈａｎｉｃａｌａｎｄＥｌｅｃｔｒｉｃａｌＥｎｇｉｎｅｅｒｉｎｇ，...

关键词： extrapolation plot fatigue life

Optimal design study of high order FIR digital filters based on neural network algorithm

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Journal of Systems engineering and Electronics 2004年第2期15卷 115-119,130页

作者： Wang Xiaohua & He YigangCollege of electrical and Information engineering, Hunan University, Changsha 410082, P. R. China College of electrical and Information engineering, Changsha University of Science and Technology,Changsha 410077, P. R. China College of electrical and Information engineering Hunan University Changsha 410082 P. R. China College of electrical and Information engineering Changsha University of Science and Technology Changsha 410077 P. R. China

An optimal design approach of high order FIR digital filter is developed based on the algorithm of neural networks with cosine basis function . The main idea is to minimize the sum of the square errors between the amplitude response of the desired FIR filter and that of the designed by training the weights of neural networks, then obtains the impulse response of FIR digital filter . The convergence theorem of the neural networks algorithm is presented and proved, and the optimal design method is introduced by designing four kinds of FIR digital filters , i.e., low-pass, high-pass, bandpass , and band-stop FIR digital filter. The results of the amplitude responses show that attenuation in stop-bands is more than 60 dB with no ripple and pulse existing in pass-bands, and cutoff frequency of passband and stop-band is easily controlled precisely .The presented optimal design approach of high order FIR digital filter is significantly effective.

关键词： high order FIR digital filters amplitude-frequency response neural network convergence theorem optimal design.

Influence of Slot Defect Length on Magnetic Flux Leakage

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Journal of Materials Science & Technology 2004年第2期20卷 231-232页

作者： Songling HUANG, Luming LI, Haiqing YANG and Keren SHIDepartment of electrical engineering, Tsinghua University, Beijing 100084, China Dept. of Elec. Eng. Tsinghua Univ. Beijing 100084 China

A key issue, which influences the applications of magnetic flux leakage testing, is defect quantification. There have been many research on the relationship between width, depth and magnetic flux leakage of slot defect. However, the length factor is often ignored. The relationship between characteristics of defect leakage field and defect length was investigated. The magnetic flux leakages of a series of plate specimens with the same width, same depth and different length slot defects were tested under the same magnetizing conditions. Testing results show that defect length is an important parameter needed to consider in quantifying defects.

关键词： Magnetic flux leakage (MFL) testing Defect quantification Slot length

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GIS中的VFT过电压分析

清华大学学报（自然科学版） 1994年第1期34卷 73-82页

作者： Ji Jiaqin(Department of electrical engineering) 清华大学电机工程与应用电子技术系北京

分析了操作气体绝缘变电站（ＧＩＳ）隔离开关所产生的特快速瞬变过程（ＶＦＴ）过电压形成的机理；ＶＦＴ的分类、特性及其对ＧＩＳ本身和电力系统高压设备可能带来的危害。陈述了ＧＩＳ中绝缘在ＶＦＴ过电压作用下的性能并初步分析了... 详细信息

分析了操作气体绝缘变电站（ＧＩＳ）隔离开关所产生的特快速瞬变过程（ＶＦＴ）过电压形成的机理；ＶＦＴ的分类、特性及其对ＧＩＳ本身和电力系统高压设备可能带来的危害。陈述了ＧＩＳ中绝缘在ＶＦＴ过电压作用下的性能并初步分析了ＶＦＴ过电压对绝缘造成危害的可能原因。作者认为随着我国高压ＧＩＳ的迅速发展，应对ＶＦＴ过电压高度重视，并加强对ＧＩＳ运行中的在线监测以提高ＧＩＳ运行的可靠性。

关键词： GIS VFT 过电压隔离开关分析

The Influence of Some Key Parameters on Fatigue Life of Common Metallic Components

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Journal of Central South University 2000年第3期12卷 159-161页

作者： LIU Yi lun (College of mech.nical and electrical engineering, Central South University, Changsha 410083, China) College of mech.nical and electrical engineering Central South University Changsha China

The effect of key parameters on fatigue life of common metallic components, e.g. steel, aluminium alloy, has been analysed quantitatively. The influential coverage and degree of these parameters have been investigated systematically, some phenomena which can′t be discovered with qualitative analysis method have been revealed, a series of valuable conclusions has been obtained, which would be very beneficial to fatigue resistant design and improvement of anti fatigue ability of metallic components.

关键词： metallic material component fatigue life key parameter effect

Dynamic Load Flow Used for Electric Power System State and Tendency Analysis

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哈尔滨工业大学学报 1990年第3期22卷 105-111页

作者： Wang Xianrong Chen Xiaohu Liu Zhuo (Department of electrical engineering)

Dynamic load flow technology can simulate actual frequency and load flow change when a load naturally varies and generator units adjust their power output by an adjustment system during a certain time. Dynamic load flow is a basic part of power system state and tendency analysis. In this paper, a dynamic load flow model and its solution method are first presented and discussed. Then, the application of dynamic load flow to a real power system is given as a demonstration.

关键词：电力系统动载荷流静态分析动态分析电力工业