检索结果-内蒙古大学图书馆

Modelling of rectified polyphase salient-pole synchronous machines: Influence of end-winding leakages on short-circuit operation diode current

引用

EUROPEAN TRANSACTIONS ON ELECTRICAL POWER 1997年第4期7卷 257-263页

作者： Zouaghi, T Barret, P Vielpeau, D Poloujadoff, M Dr.-Ing. Taoufik Zouaghi (1957) graduated as an Electrical Engineer from “Institut National Polytechnique de Grenoble” France in 1982 and obtained the “Diplome d'Etudes Approfondies” degree in Electrical Engineering at the same year. From 1983 to 1987 he has been at the energy production and delivery Department of the Tunisian Utility (Steg-Tunisia). From 1988 to 1991 he has been at the Research Departement of “The French Utility” (EDF) and with the Scientific Staff of the Laboratoire d'Electrotechnique of Universitk P. et M. Curie of Paris France where he received the Docteur de L'Universite ParisVI degree. Since I992 he is working as an Assistant Professor at the Ecole Nationale d'lngtnieurs de Tunis Tunesia. His research activities include Electrical Machines Power Electronics and Electrical Networks (ENIT Dept. G.E.-BP.37 Le Belvtdtre 1002 Tuniflunisia Phone: +2161/514700 Fax:+2161/510729) Dr. Philippe Barret (retired no biography available at time of printing). Ing. Didier Vielpeau (no biographyting). Address: EDF-DEPT-DEE 30-40 rue at time of Rennault 92068 Paris la Defense cedex 48 France.

Art accurate modellization method of rectified polyphase salient-pole synchronous machines is carried out in this paper. An eleven phase rectified synchronous generator is used to supply the field windings of a large hydraulic alternator. To simulate its operation if has been necessary to develop a convenient diode model and to determine accurately the magnetic linkage parameters. The results have shown that short-circuit operation heavily depends on the shape of the field in the end-turn windings.

关键词：

来源：评论

学校读者我要写书评

暂无评论

A fair and efficient bandwidth allocation algorithm for high-speed local area networks

引用

ELECTRONICS AND COMMUNICATIONS IN JAPAN PART I-COMMUNICATIONS 1996年第5期79卷 66-75页

作者： Saito, T Aida, H Kim, B Aoki, T Faculty of Engineering the University of Tokyo Tokyo Japan 113 Byung-suk Kim:graduated in 1991 from the Department of Electrical Engineering Seoul University Korea and received his Master's degree in 1994 from the University of Tokyo where he is currently in the doctoral program. He is engaged in research on access control in ultrahigh-speed LAN.

With the advent of broadband integrated services digital network (B-ISDN), there is the increasing need for high-speed multimedia systems also in the area of local area networks (LANs). It is obvious that the conventional systems such as CSMA/CD or token ring cannot cope with those requirements. At present, several new access control methods are proposed for slotted ring (or bus) LANs suited to transmission rates above 155 Mbps. This paper reviews the characteristics of those methods in a systematic way and proposes a new access control method called distributed reset algorithm (DRA). DRA can provide high throughput while maintaining the almost strict access fairness by using a new control called ''access bit control'' in addition to the already known window control.

关键词： high-speed LAN slotted ring ATMR metaring method FECCA

来源：评论

学校读者我要写书评

暂无评论

Wavelet transform-based signal waveform discrimination for inspection of rotating machinery

引用

ELECTRICAL engineering IN JAPAN 1996年第2期117卷 80-92页

作者： Tamaki, K Matsuoka, Y Uno, M Kawano, T Hitachi Ltd. Received his Master's degree in 1986 in Electrical Engineering from Keio University. He joined Hitachi Ltd. in April of the same year. He is engaged in research and development of automatic production facilities particularly in research and development of servo control systems and signal processing systems. He is currently an Engineer at the company's Production Engineering Research Laboratory. He is a member of the Society of Instrument and Control Engineers and IEEE. Graduated in 1991 from the Department of Production Engineering of the Faculty of Engineering Yokohama National University and joined Hitachi Ltd. He is engaged in research and development of automatic production facilities particularly in research and development of signal processing systems. He is currently working at the company's Production Engineering Research Laboratory. Received his Master's degree in 1975 in Precision Engineering from Shizuoka University and then joined Hitachi Ltd. He is engaged in research on automatic adjustment and assembly technologies as well as development of their equipment. He is currently a Senior Engineer at the company's Production Engineering Research Laboratory. He is a member of the Japan Society of Mechanical Engineers and the Japan Society for Precision Engineering. Graduated in 1961 from the Department of Mechanical Engineering Tohoku University. He received his Ph.D. degree in Mechanical Engineering from Tokyo University in 1993. He joined Hitachi Ltd. in October 1970. He is engaged in research and development of automatic assembly technology and assembly equipment as well as inline process technology and process equipment. Since 1995 he has been with Ishinomaki Senshu University where he is currently a Professor. He is a member of the Japan Society of Mechanical Engineers and the Japan Society for Precision Engineering.

This paper presents a new discrimination procedure of signal waveforms based on wavelet theory for the inspection of rotating machinery. The wavelet transform decomposes signals into time-frequency space, rather than mere frequency space, limited by the uncertainty principle. This decomposition permits time-frequency analyses and provides a more flexible means of signal processing than before. To examine a rotary compressor pump, particular waves in the rotational load torque signals that correlate with failure modes are discriminated from one another and evaluated. To extract the focal waves, the signal is decomposed with wavelets and then only particular waves, such as impulses, are reconstructed from a selected set of wavelet coefficients. This is called time frequency space filtering. The wavelet local modulus maxima are used to pen a time-frequency window through which only the focal waves can pass with high fidelity. The maxima have information of the inflection points of the wave at each resolution that represent its waveform. The experimental results show the effectiveness of the procedure.

关键词： wavelets signal processing time-frequency analysis multiresolution decomposition inspection rotating machinery

来源：评论

学校读者我要写书评

暂无评论

Measurement of refractive index distribution of optical waveguides by the propagation mode near-field method employing an improved inverse analysis

引用

ELECTRONICS AND COMMUNICATIONS IN JAPAN PART II-ELECTRONICS 1996年第9期79卷 21-29页

作者： Yabu, T Sawa, S Geshiro, M Faculty of Engineering Osaka Prefecture University Sakai Japan 593 Graduated from the Department of Electronic Engineering Doshisha University in 1989 and received his M.S. degree from Kyoto University in 1991. He withdrew from the doctoral program in 1993 and became a Research Associate at Osaka Prefecture University. He has been engaged in research on optical waveguides. Graduated from the Department of Electrical Engineering Osaka Prefecture in 1962 and joined Mitsubishi Electric remaining there until he left in 1964. He received his M.S. He received his M.S. and Dr. of Eng. degrees from Osaka University in 1967 and 1970 respectively. In 1970 he became an Associate Professor at Ehime University in the Department of Electronic Engineering where he was promoted to Professor in 1976. In 1991 he became Professor of Osaka Prefecture University in the Department of Electrical Engineering and in 1993 Professor in the Department of Electrical and Electronic Systems Engineering. He has been engaged in research on optical waveguides optical integrated circuits optical fibers and planar antennas. He is a member of IEEE Laser Society and the Institute of Electrical Engineers of Japan. Graduated in 1973 from the Department of Communication Engineering Osaka University and received his M.S. and Dr. of Eng. degrees in 1975 and 1978 respectively. In 1979 he became a Research Associate at Ehime University where he was promoted to an Associate Professor in 1984. In 1986–87 he was on leave at the University of Texas at Austin. In 1994 he became an Associate Professor at Osaka Prefecture University. He has been engaged in research on optics and millimeter wave and microwave waveguides. He is a member of IEEE.

A method to estimate the refractive index profile of an optical waveguide exists in which the optical intensity distribution of the only one propagation mode is used. Since this method requires only a microscope and a television camera, setup is extremely simple and inexpensive, thereby making the method practical. The differential processing method and the inverse analysis method have been proposed as methods to use the optical intensity distribution of only one propagation mode. The mechanisms of these methods that use the optical intensity distribution are presented in detail here. As a consequence, a new method that overcomes the difficulties in the previous methods, to be called Improved Inverse Analysis Method with Fewer Parameters, is proposed. Further, by using this proposed method, the index profiles of the step-index type optical fiber and the buried optical waveguide can be estimated in order for validity of the method to be studied.

关键词： optical waveguide refractive index profile image measurement

来源：评论

学校读者我要写书评

暂无评论

Ultrasonic motor based on coupled longitudinal-bending vibrations of a diagonally symmetric piezoelectric ceramic plate

引用

ELECTRONICS AND COMMUNICATIONS IN JAPAN PART II-ELECTRONICS 1996年第6期79卷 60-67页

作者： Aoyagi, M Tomikawa, Y Faculty of Engineering Yamagata University Yonezawa Japan 992 Graduated from the Department of Electrical Engineering Yamagata University in 1989 received his Master's degree from there in 1991 and joined the Department of Electrical Engineering and Information Science of the same university as a Research Associate. He has been engaged in research and development of ultrasonic electronics. He received the Young Engineer Encouragement Award in 1994. He is a member of the Acoustical Society of Japan. Graduated from the Department of Electrical Engineering Yamagata University in 1962 and received his Ph.D. degree from the University of Tokyo in 1974. He worked at Hitachi Manufacturing K.K. from April to December 1962. He joined the Electrical Engineering Department of Yamagata University as a Research Associate in 1963 and was appointed as a Professor in November 1984. At the present he is with the Department of Electrical Engineering and Information Science. He is engaged in the research and development of electromechanical vibrators and ultrasonic electronics. He was a Visiting Scholar at UCLA from October 1975 to October 1976. He has been engaged in the research and development of ultrasonic electronics especially ultrasonic motors/actuators ultrasonic sensors and nondestructive evaluation. He received the Young Engineer Yonezawa Memorial Encouragement Award in 1971 the Ohm Award in 1971 the Encouragement Award from the Japanese Society for Nondestructive Inspection in 1986 and the Best Paper Award from the Image Sensing Technology Symposium in 1987. He is a member of the Acoustical Society of Japan the Institute of Electrical Engineers of Japan the Japan Society of Applied Electromagnetics and the Japanese Society for Nondestructive Inspection.

This paper discusses the operating principle and performance characteristics of an ultrasonic motor based on the coupled longitudinal-bending vibrations of a diagonally symmetric piezoelectric ceramic plate. It is well known that longitudinal and bending vibrations couple with each other in a diagonally symmetric piezoelectric ceramic plate. The objective of this investigation is to design a simple and thin ultrasonic motor based on these coupled mode vibrations. The design of a stator for an ultrasonic motor was optimized with respect to vibration mode, capacitance ratio, and direction of vibratory displacement by employing the finite element method. A simple ultrasonic motor was built and its performance was tested. The results indicate that its load characteristics vary widely depending on the contact point of the rotor and the geometry of a piezoelectric plate. Furthermore, attempts were made to equalize load characteristics for bidirectional operations. The efforts revealed that it is possible to equalize the rotation rate, but it is difficult to equalize efficiencies for bidirectional operations. By incorporating a self-oscillation circuit with an inverter, it is possible to nm the motor bidirectionally in a single-phase mode.

关键词： diagonally symmetric piezoelectric ceramic plate mode-coupled vibration single-phase drive reverse operation

来源：评论

学校读者我要写书评

暂无评论

Soliton system evaluations using fibers with dispersion and loss fluctuations

引用

ELECTRONICS AND COMMUNICATIONS IN JAPAN PART II-ELECTRONICS 1996年第4期79卷 77-84页

作者： Ishiba, K Komatsu, T Takahara, M Faculty of Engineering Yamanashi University Kofu Japan 400 Graduated in 1994 from the Department of Electronic and Information Engineering where he is currently in the Master's program. He has been engaged in research on optical fiber soliton transmission. Received his B.S. and M.S. degrees in 1993 and 1995 respectively from the Department of Electronic and Information Engineering Yamanashi University. He joined NTT in April 1995. He has been engaged in research on simulation of the optical fiber soliton transmission and on the transmission system with flexibility in transmission speed. Graduated from the Department of Electrical Engineering Yamanashi University in 1965 and received his M.S. degree in 1967. He received his Ph.D. degree later. In 1967 he became a Research Associate of the Department of Electronic Engineering Yamanashi University. In 1991 he became a Professor of Electronic and Information Engineering. He has been engaged in research on special function theory nonlinear circuits optical communication systems and LAN systems. In 1984 he received a Book Award from I.E.I.C.E. In 1990–91 he was on leave at Southampton University. He is a member of IEEE.

In the development of practical multimedia systems, greater capacity is desired in a long-distance large-capacity transmission system. A number of studies have been undertaken to develop a long-distance large-capacity system. Several long-distance transmission experiments for high-density transmission by wavelength demultiplexing method (WDM) have been reported recently. However, more of the experimental examples have reported on soliton transmission than on WDM systems. Hence, the former is considered more advanced. It is necessary to prepare a fiber of a length of approximately 10,000 km for ultralong-distance transmission experiment. Since this is difficult to obtain, repetitive experiments are often the case. However, such an experiment does not disclose the effects of dispersion and loss fluctuation in the fiber. In this paper, the effect of fluctuation in dispersion and loss in the fiber is studied by simulation so that the resilience of the soliton to the variations of the fiber characteristics is evaluated.

关键词： optical soliton dispersion fluctuation loss fluctuation Gordon-Haus jitter

来源：评论

学校读者我要写书评

暂无评论

Use of multiple-valued logic with 1.9-V operational power supply to obtain a high-speed current-mode logic circuit

引用

ELECTRONICS AND COMMUNICATIONS IN JAPAN PART II-ELECTRONICS 1996年第7期79卷 97-105页

作者： Sugimoto, Y Faculty of Science and Engineering Chuo University Tokyo Japan 112 Graduated in 1973 from the Department of Electrical Engineering Tokyo Institute of Technology received his Master's degree in 1980 from the University of Michigan U.S.A. and his Dr. of Eng. degree from Michigan U.S.A. and his Dr. of Eng. degree from Tokyo Institute of Technology in 1991. He was a Quality Tech. Consultant (Electrical Engineering) in 1986 and affiliated in 1973 with Toshiba Corporation Semiconductor Business Sector. In 1992 he became a Professor in the Department of Elect. Elect. Engineering Chuo University. He is engaged in research and development of analog LSI Bi-CMOS mixed analog/digital LSI Bi-CMOS ASIC bipolar high-speed logic LSI and analog CMOS circuits. He is a member of the IEEJ Soc. Hybrid Microelect. IEEE and Jap. Tech. Consult. Society.

This paper proposes a new construction of bipolar current-mode (CML) logic circuits based on the multiple-valued logic concept. Applying the multiple-valued logic concept, the new logic function, which can replace the conventional stack logic circuit and can be operated by a low supply voltage, can be realized. In conventional circuits, it is difficult to generate a signal with multiple voltage levels at the same time as the output of a logic gate and logic gates must be connected by placing a level-shifter between them. A circuit is devised in this study that generates the multiple-valued logic levels (three levels in this paper) simultaneously at the output of the logic gate. Also, it is examined whether or not the basic logic functions, such as NAND, NOR, EX-OR, and D-Latch, can be realized by the proposed configuration. The characteristics of the proposed circuit are circuit simulated by a SPICE circuit simulator. It is seen as a result that the power consumption, the logic density, and the high-speed performances, comparable to the conventional stacked-gate logic circuit, can be realized with the low supply voltage of 1.9 V.

关键词： CML circuit bipolar transistors high speed low voltage multiple-valued logic

来源：评论

学校读者我要写书评

暂无评论

Surface acoustic wave microsensors

引用

ELECTRONICS AND COMMUNICATIONS IN JAPAN PART II-ELECTRONICS 1996年第3期79卷 42-50页

作者： Shiokawa, S Kondoh, J Faculty of Engineering Shizuoka University Hamamatsu Japan 432 Graduated from the Department of Communication Engineering Tohoku University in 1965 and received her M.S. degree from the University of Electro-Communications in 1968. She received her Dr. of Eng. degree from Tokyo Institute of Technology in 1971. In 1971 she became a Research Associate at Tokyo Institute of Technology. In 1980–81 she was a Research Fellow at the Institute of Neural Physiology at the University of Bordeaux France. In 1986 she became an Associate Professor at Shizuoka University in the Department of Electromechanical Engineering where she was promoted to Professor in 1991. She has been engaged in research on cluttering of relays holographic observation of surface waves ultrasound measurement of liquid and surface plasmon of biosensors. She is a member of the Applied Physics Society Acoustic Society Institute of Electrical Engineers of Japan and IEEE. Graduated from the Department of Optoelectromechanical Engineering Shizuoka University in 1990 and received his Dr. of Eng. degree from there in 1995. Since 1993 he has been a special Research Associate at the Japan Society for the Promotion of Science. In 1994 he received an Awaya Award from the Acoustic Society and Hiroshi Ando Memorial Award in 1994. He has been engaged in research on chemical sensors using surface acoustic wave devices. He is a member of the Acoustic Society Applied Physics Society

It was found that a surface acoustic wave microsensor is highly sensitive in detecting the physical and chemical changes of the medium on the vibrating surface in real time. Hence, microsensors are used in many applications. There are already several types of surface acoustic wave microsensors with their differences based on vibration and wave modes. New types of sensors are proposed herein and new findings and new applications are reported. The present level of development of surface acoustic wave microsensors is described and these sensors are compared, discussed, and evaluated. Fundamental characteristics are then presented for the shear-surface acoustic wave (SH-SAW) microsensors using a 36 degrees rotated Y-plate X-propagation LiTaO3 studied by the authors. It is shown that this sensor has many applications. Further, if several SH-SAW sensors with different frequencies are used, a high recognition rate can be obtained even for liquid samples that cannot be recognized by human perception. The example used here is 13 types of whiskey.

关键词： quartz crystal microbalance surface acoustic wave sensor shear-surface acoustic wave sensor shear plate mode sensor flexural plate mode sensor

来源：评论

学校读者我要写书评

暂无评论

A finite-element beam-propagation method for strongly guiding optical waveguides with magnetooptic materials

引用

ELECTRONICS AND COMMUNICATIONS IN JAPAN PART II-ELECTRONICS 1996年第7期79卷 22-29页

作者： Tsuji, Y Koshiba, M Tanabe, T Faculty of Engineering Hokkaido University Sapporo Japan 060 Graduated in 1991 from the Department of Electronic Engineering Hokkaido University and received his M.S. degree in 1993. He is currently working toward a doctoral degree. He has been engaged in research on the computer-aided design of optical and quantum-wave phenomena and quantum-effect devices. Graduated in 1971 from the Department of Electronic Engineering Hokkaido University and received his M.S. and Dr. of Eng. degree in 1973 and 1976 respectively. In 1976 he became a Lecturer at Kitami Institute of Technology where he was promoted to an Associate Professor in 1977. In 1979 he became an Associate Professor in the Department of Electronic Engineering Hokkaido University where he was promoted to Professor in 1987. He has been engaged in research on opto- and wave-electronics. In 1987 he received a Best Paper Award. He is the author ofFoundations of Finite Element Method for Opto- and Wave-Electronics(Morikita Publ.)Optical Waveguide Analysis(Asakura Publ.)Optical Waveguide Analysis(McGraw-Hill Book Co.) andOptical Waveguide Theory by the Finite Element Method(KTK Scientific Publishers/Kluwer Academic Publishers). He has co-authored one book and written Graduated in 1995 from the Department of Electronic Engineering Hokkaido University and is currently in the Master's program. He has been engaged in research on opto- and wave-electronics.

To the best of the knowledge of the authors, the formulation is carried out for the first time on the finite-element beam-propagation method for the analysis of the magnetooptic waveguide in which the structure varies along the propagation direction. The present method is applicable not only to the case in which refractive index difference is small but also to the case for the TE mode and the TM mode propagating in a waveguide with a large refractive index difference. To suppress the spurious reflection from the computational window edges, the transparent boundary condition is applied.

关键词： seam-propagation method finite-element method magnetooptical material optical isolator

来源：评论

学校读者我要写书评

暂无评论

Analysis of nonreciprocal mode-conversion properties of magnetooptic channel waveguides using the finite element method

引用

ELECTRONICS AND COMMUNICATIONS IN JAPAN PART II-ELECTRONICS 1996年第10期79卷 32-39页

作者： Zhuang, XP Koshiba, M Tsuji, Y Faculty of Engineering Hokkaido University Sapporo Japan 060 Graduated from the Department of Communication Engineering Guellin Electronic Institute China in 1986. She received her M.S. degree from Hokkaido University in 1991 and was admitted to the doctoral program. She has been engaged in research on the optimum design of magnetooptic waveguides for nonreciprocal optical devices. Graduated in 1971 from the Department of Electronic Engineering Hokkaido University where he received his M.S. degree in 1973 and his Dr. of Eng. degree in 1976. In 1976 he became a Lecturer in the Department of Electronic Engineering Kitami Institute of Technology where he was promoted to Associate Professor in 1977. In 1979 he became an Associate Professor at Hokkaido University where he was promoted to Professor in 1987. He has been engaged in research on optical and wave electronics. In 1987 he received a Best Paper Award. He is the author ofFundamentals of Finite Element Method of Optics and Waves(Morigkata Publ.)Optical Waveguide Analysis(Asakura Publ.)Optical Waveguide Analysis(McGraw-Hill Book Co.) andOptical Waveguide Theory by the Finite Element Method(KTK Scientific Publishing/Kulwer Academic Publishers). He is also co-author of one book and has written chapters in six other books. He is a member of the Institute of Television Engineers of Japan the Institute of Electrical Engineers of Japan the Japan Society for Simulation Technology the Japan Society for Computational Methods in Engineering and the Japan Society of Applied Magnetics and Mechanics. He is also an IEEE Senior Member. Graduated in 1991 from me Department of Electronic Engineering Hokkaido University where he received his M.S. degree in 1993. He is currently in the doctoral program. He has been engaged in research on quantum wave phenomena and computer-aided design of optical and quantum effect devices.

To evaluate nonreciprocal mode conversion characteristics in a magnetooptic channel waveguide, a finite element analysis based on the scalar wave approximation is formulated for the first time. A simple iterative calculation method is conceived for solution of the nonlinear eigenvalue equations finally obtained in which the two polarizations are coupled. Specifically, the maximum isolation ratio in the mode-conversion-type magnetooptic rib guide was evaluated and the validity of the method is confirmed by comparison with published experimental results.

关键词： nonreciprocal optical devices magnetooptic waveguide nonreciprocal mode conversion finite element method numerical analysis

来源：评论

学校读者我要写书评

暂无评论

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

请选择保存的检索档案：

请选择收藏分类：

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

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

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：