检索结果-内蒙古大学图书馆

ACQUISITION REFORM AND BEST PRODUCT PROCUREMENT - AN engineering VIEW

NAVAL ENGINEERS JOURNAL 1994年第6期106卷 41-57页

作者： FISHER, DA SKOLNICK, A He has been involved with several weapon system developments. Among these were the Trident II fire control and navigation systems the BSY-I Anti-Submarine Warfare System and the Navy standard computers (UYK44 and EMSP). He served as manager of the Digital Circuits Engineering Branch and was then appointed as manager of the Automatic Test Equipment (ATE) Technology Division. As manager of the ATE Technology Division he was responsible for the SP-23 Fire Control System Support Project the SP-24 Navigation Project and the Fleet Progressive Maintenance Program (2M/ATE). This Division was responsible for selection and application of electronic product technology and for developing fleet test and repair techniques. He holds a B.S. in Electrical Engineering from the University of Evansville and is currently pursuing a Masters of Public Administration at Indiana University-Purdue University Indianapolis. Dr. Alfred Skolnick:retired from the Navy in 1983 with the rank of captain. He is president of System Science Consultants (SSC) specializing in strategic planning technical program definition technology assessment and engineering analyses on selected matters of national interest. Dr. Skolnick taught mathematics and management sciences at University of Virginia and Marymount University. He is adjunct faculty at Northern Virginia Community College. From 1985 to 1989 he was president of the American Society of Naval Engineers. In the Navy he served at Applied Physics Laboratory/The Johns Hopkins University then aboard USSBoston(CAG-1) and played leading roles in several weapon system developments inertial navigation (Polaris) deep submergence (DSRV) and advanced ship designs (SES). He later was director Combat System Integration Naval Sea Systems Command and head Combat Projects Naval Ship Engineering Center. In 1975 he became a major project manager and led the Navy's High Energy Lasers Program in 1981 he was assigned all Navy Directed Energy Weapons development efforts. He was vice president advanced tech

The military services are being moved in the direction of performance-based specifications and standards. They are being steered against dictating ''how to'' produce an item since such action forecloses on the ability to gain access to components or technology that may have a commercial equivalent. Why should the engineering community embrace the new approach? Aside from the obvious weight of it being approved policy, therefore currently mandated, it warrants examination because it is the correct approach at this time when applied to appropriate products. Military specifications and standards are to be displaced then, by acceptable alternative contractor design solutions. Industry bidders will be allowed to propose the particular design details, permitting procurement flexibility by contractually citing only system level or interface requirements, both physical and functional. Hopefully, this can broaden the industrial base and increase competition with reduced costs to follow. Conceptually, the approach appears both performance-sensible and cost-attractive (there are, of course, consequent risks) but how does implementation proceed? Is it possible to pursue the goals envisioned along paths that are not in themselves experimental? Can the American postulate, minimal loss of life and limb to U.S. military people, continue to be honored? Experience and track record elsewhere imply encouraging possibilities in select situations-useful prospects are identified and discussed in practical terms.

关键词：

来源：评论

学校读者我要写书评

暂无评论

PERFORMANCE OF A PRIORITIZED ON-BOARD BASEBAND SWITCH FOR A MULTISERVICE MULTIBEAM SATELLITE

引用

INTERNATIONAL JOURNAL OF SATELLITE COMMUNICATIONS 1994年第3期12卷 283-297页

作者： BOHM, S ELHAKEEM, AK HACHICHA, M Department of Electrical and Computer Engineering Concordia University 1455 De Maisonneuve Blvd. West Montreal H3A 1M8 Canada Was born in Montreal Canada on 14 September 1966. He received the B. Eng. degree in electrical engineering from Concordia University Montreal Canada in 1989. He is at present completing the M.A.Sc. degree in electrical engineering at Concordia University. (S'75–S'79–M'79–SM'86) received the Ph.D. degree from Southern Methodist University Dallas TX in 1979. He spent the next two years working as a Visiting Professor in Egypt after which he moved to Ottawa Canada in 1982. He assumed teaching and research positions in Carleton and Manitoba Univerities and later moved to Concordia University Montreal Canada in 1983 where he is now a Professor in the Electrical and Computer Engineering Department. He has published numerous papers in IEEE and international journals in the areas of spread spectrum and networking. He is a well-known expert in these areas and serves as a consultant to many companies. His current research interests include wide-band metropolitan networks switching architectures and performance of on-board multibeam satellites acquisitionless CDMA networks code distribution and orthogonalization of CDMA signals responsive congestion control for ATM-based networks ARQ techniques and investigation of the novel SUGAR CDMA systems in fading channels. Dr. Elhakeem is a Senior Member of the Canadian Electrical Engineering Society and Armed Forces Association. He has chaired numerous technical sessions in IEEE Conferences was the Technical Program Chairman for IEEE Montech 1986 Montreal Canada. Dr. Elhakeem is the key guest editor of theIEEE Journal of Selected Areas in Communicationsfor the May June issues 1993 covering CDMA networks. Advanced Technology & Networks VISTAR Telecommunications Inc. Ottawa Ontario K1G 3J4 Canada An Associate Director of Advanced Technology & Networks Group VISTAR Telecommunications Inc. Ottawa Canada. He is also an Adjunct Pr

In this paper, we study the performance of a prioritized on-board baseband switch in conjunction with a multibeam satellite handling integrated services. The services considered for the analysis include voice, video, file transfer and interactive data. The prioritized switch uses both input and output buffering, switch speed-up as well as a two-phase head-of-line resolution algorithm, in order to reduce the buffer loss while maintaining acceptable user delays. The minimum required buffer capacity and switch speed-up for each service in a prioritized environment are found under uniform traffic conditions. It is shown that under uniform traffic conditions, only minimal buffering and switch speed-up are needed even for the lowest priority users. The performance dependence on the switch size is also substantially reduced with head of line resolution and buffering even in a prioritized environment.

关键词： SWITCH ON-BOARD BASEBAND MULTIBEAM PRIORITIZED HEAD-OF-LINE UNIFORM LOAD SPEED-UP

来源：评论

学校读者我要写书评

暂无评论

MPSA abstracts

引用

Journal of Protein Chemistry 1994年第5期13卷 515-543页

作者： Aminlari, Mahmoud Asquith, Thomas Sarlo, Katherine Bailey, Jerome M. Tu, Oanh Issai, Gilbert Ha, Alice Shively, John E. Bell, Alexander W. Baur, Nicole C. Bergeron, John J. M. Ou, Wei -Jia Thomas, David Y. Cianflone, Katherine Baldo, Allain Hincke, Maxwell T. Momparler, Richard L. Laliberté, Josée Thomson, David M. P. Sutherland, M. Besada, Vladimir Gonzalez, Javier Padron, Gabriel Garay, Hilda Reyes, Osvaldo Takao, Toshifumi Shimonishi, Yasutsugu Bischoff, Rainer Roecklin, Dominique Bouchon, Bernadette Klarskov, Klaus Van Dorsselaer, Alain Brake, Patricia G. Pacitti, Anne Higgins, Terry Stevis, Panos Malinowski, John McElhiney, Sue Huang, Janes Vestal, Christine Buckel, Scott D. Stevenson, Tracy Loo, Joseph A. Caffrey, Martin Wang, Jin Wallace, Carmichael J. A. Clark-Lewis, Ian Carraway, C. A. Carothers Huang, J. Li, Y. Juang, S. -H. Gallo, A. Mayer, B. J. Carraway, K. L. Coleman, Patrick L. Sarpong, Daniel Deerfield, David W. Holland-Minkley, Amanda Hempel, John D. Nicholas, Hugh B. Denslow, Nancy D. Folmar, Leroy C. Sullivan, Craig V. Dixon, James D. Mark, Jonathan P. Elicone, Christopher P. Maleknia, Simin D. McGuinness, Brian F. Regnier, Fred E. Afeyan, Noubar B. Dolence, Julia M. Poulter, C. Dale Egorov, Tsezi Musolyamov, Alexander Popineau, Yves Andersen, Jens Roepstorff, Peter Falkenstein, Roberto J. Biscoglio de Jiménez Bonino, Mirtha J. Peña, Clara Gauggel, D. L. Asquith, T. N. Isfort, R. J. Miller, N. S. Cody, D. B. Giblin, Michael F. Wong, Tuck C. Quinn, Thomas P. Grant, Gregory A. Crankshaw, Mark W. Griffith, Scott Schroeder, Steve Quinn, Thomas Guinet, F. Petillot, Y. Chapsal, J. M. Dubayle, J. Greco, F. Barge, O. Forest, E. Valentin, C. Hahn, Frederick M Baker, Jonathan A. Haniu, Mitsuru Kenney, William C. Rohde, Michael F. Harman, James G. Lee, Eun Ju Glasgow, Joel Lew, Sew Fen Belduz, Ali O. Harris, Reed J. Molony, Michael S. Keyt, Lene H. Wu, Shiaw -Lin Hawke, David H. Tso, Jaqueline Early, Sherrell Miller, Chad G. Hayman, G. Thomas Miernyk, Jan A. Hellman, Ulf Wernstedt, Christer Góñez, Jorge H Department of Biochemistry School of Veterinary Medicine Shiraz University Shiraz Iran Corporate Professional & Regulatory Services/Human Safety Dept. The Procter & Gamble Co. Cincinnati Division of Immunology Beckman Research Institute of the City of Hope Duarte Protein Analytic Facility Sheldon Biotechnology Centre USA McGill University Montreal Department of Anatomy USA Biotechnology Research Institute NRC Canada Division of Cardiology Royal Victoria Hospital USA Department of Anatomy University of Ottawa Faculty of Health Science Ottawa Centre de Recherche Pediatrique Hôpital Ste-Justine Université de Montréal Montreal Department of Immunology Montreal General Hospital USA Center for Genetic Engineering & Biotechnology Cuba Institute for Protein Research Osaka University Osaka Japan Protein Analytical Group TRANSGENE S.A. Strasbourg Cedex France Vakgroep Biochemie Fysiologie en Microbiologie Gent Belgium Laborat. de Spectrométrie de Masse Bioorganique URA 31 CNRS Université Louis Pasteur Strasbourg Cedex France Sterling winthrop Inc. Collegeville Lexin Pharmaceutical Corporation Horsham PerSeptive Biosystems Houston Parke-Davis Pharmaceutical Research Division of Warner Lambert Company Ann Arbor Dept. of Chemistry The Ohio State University Columbus USA Dept. of Biochemistry Dalhousie University Halifax Canada Biomedical Research Center University of British Columbia Vancouver Canada Dept. of Biochem. & Molec. Biol. Univ. of Miami Sch. of Medicine Miami The Rockefeller Institute New York Dept. of Cell Biol. & Anat. Univ. of Miami Sch. of Medicine Miami Biosciences Laboratory 3M Co. St. Paul Pittsburgh Supercomputing Center Pittsburgh Department of Molecular Genetics/Biochemistry University of Pittsburgh Pittsburgh Dept. Biochem. and Mol. Biol. University of Florida Gainesville U.S. Environmental Protection Agency Gulf Breeze Dept. Zoology North Carolina State University Raleigh PerSeptive Biosystems Inc. Cambridge Department of Chemistry Univ

来源：评论

学校读者我要写书评

暂无评论

Digital Adaptive control of Rotary System with Unknown Nonlinear Friction

引用

IFAC Proceedings Volumes 1993年第2期26卷 81-84页

作者： S. Sagara F. Ohkawa T. Yamashita M. Tomizuka Department of Control Engineering Faculty of Engineering Kyushu Institute of Technology Tobata Kitakyushu 804 Japan Department of Control Engineering and Science Faculty of Computer Science and Systems Engineering Kyushu Institute of Technology Iizuka 820 Japan Department of Mechanical Engineering University of California Berkeley Berkeley CA 94720 USA

This paper is concerned with the design of a discrete time Model Reference Adaptive control System (WACS) for motion control under unknown nonlinear friction. Static and Coulomb friction forces are represented by a deadzone element for the input, which is active at low velocities. and disturbance. which may take different values depending on the motion direction. respectively. Then, the WAes for the nonlinear friction is a cascade combination of a nonlinear block which contains the deadzone and the disturbance term and a linear dynamic block. Experimental results from a rotary servo system demonstrate the effectiveness of the proposed WAeS

关键词： Model reference adaptive control Nonlinear friction Rotary System Servomechanisms

来源：评论

学校读者我要写书评

暂无评论

A Force control Method Using the Relative Motion between the Manipulator and a Workpiece

引用

IFAC Proceedings Volumes 1993年第2期26卷 461-464页

作者： K. Watanabe T. Fukuda S.G. Tzafestas Department of Mechanical Engineering Faculty of Science and Engineering Saga University Honjomachi-1 Saga 840 Japan Department of Mechano-Informatics and Systems Faculty of Engineering Nagoya University Furocho Nagoya 464-1 Japan Intelligent Robotics and Control Unit Computer Science Division National Technical University of Athens Zografou Athens 157 73 Greece

control methods based on using the relative motion between the manipulator and the workpiece are described for controlling the force of a one-dimensional manipulator, in which it is assumed that there are no collisions between the manipulator and the workpiece and we use a computed force law which is similar to the computed torque law in the trajectory tracking problem of a manipulator. We consider two cases depending on whether the position and velocity of the workpiece (or end-effector) are available or not to calculate the computed force control. The effectiveness of the proposed control methods is illustrated by some computer simulations.

关键词： PID control contact motion force control robots manipulator servomechanisms

来源：评论

学校读者我要写书评

暂无评论

Multiobjective controller Design with the Guaranteed H ∞ control Performance

引用

IFAC Proceedings Volumes 1993年第2期26卷 149-152页

作者： T. Sugie M. Fujita S. Hara Division of Applied Systems Science Kyoto University Uji Kyoto 611 Japan Japan Advanced Institute of Science and Technology Hokuriku Tatsunokuchi Ishikawa 923-12 Japan Department of Control Engineering Tokyo Institute of Technology Meguro-ku Tokyo 152 Japan

This paper is concerned with the problem to find a controller which satisfies (a) internal stability, (b) the robust tracking, (c) the exact model matching and (d) the specified H 00 control performance related to the feedback properties. First, we give a necessary and sufficient condition for such a controller to exist. Second, we characterize all such controllers, where (i) the two-degree-of-freedom compensator configuration and (ii) the free parameter of the H∞ suboptimal controller are fully exploited, Third, we evaluate the effectiveness of our control method by tlte experiment using a magnetic bearing system.

关键词： H∞ control robust regulation exact model matching two d.o.f. control system magnetic bearings

来源：评论

学校读者我要写书评

暂无评论

H∞ control of gasturbine engines for helicopters

H∞ control of gasturbine engines for helicopters

引用

American control Conference (ACC)

作者： Ryo Watanabe Masahiro Kurosaki Takeshi Kusakawa Kenko Uchida Masayuki Fujita Control Systems Engineering Department Aero-Engine and Space Operations Ishikawajima-Harima Heavy Industries Company Limited Nishitama Tokyo Japan Engineering Department Aero-Eugine and Space Operations Ishikawajima-Harima Heavy Industries Company Limited Nishitama Tokyo Japan Department of Electrical Engineering Waseda University Shinjuku Tokyo Japan School of Information Science Japan Advanced Institute of Science and Technology Ishikawa Japan

Engines tests were conducted in order to demonstrate effectiveness and practicability of H ∞ control theory to helicopter engines. An engine control algorithm is designed by H ∞ control theory, which meets robust stability requirements and nominal performance requirements described in frequency domain. Simulation ad engine test results show that H ∞ controllers with feedforward element have better control performance than PI controller with feedforward element, especially, less power turbine speed overshoots are observed in rapid torque decreasing tests.

关键词： Engines Turbines Helicopters Torque control Testing Shafts control systems Noise measurement control theory Space technology

来源：评论

学校读者我要写书评

暂无评论

Simple robust adaptive control of static VAR compensator

引用

European Transactions on Electrical Power 1993年第6期3卷 429-435页

作者： Machowski, J. Nelles, D. Jan Machowski (1950) received the M.Sc. degree in Electrical Faculty of Warsaw University of Technology in 1974. For two years he was employed in the Power Dispatching Centre in Warsaw/Poland. Later after gaining some field experience in several power plants he did a postgraduate study at Warsaw University of Technology where he received his Ph.D. degree in 1979. In the same year he joined the Electrical Faculty of Warsaw University of Technology where he is presently employed as a professor and head of the power system protection and control group. His areas of interest are power systems analysis protection and control. Since October 1989 he has been with Kaiserslautem University/Germany. (Univ. Kaiserslautern FB Elektrotechnik. P.O. Box 30 49 67618 Kaiserslautem T +4963/205-3431 Fax +49631/205-21 68) Dieter Nelles (1939). VDE received the Dipl.-Ing. degree in electrical engineering in 1966 from the Technical University in Darmstadt/Germany and the Dr.-Ing. degree in 1973 from the Technical University of Berlird/Germany. Since 1966 he has been with the Technical and Science Department of AEG-Telefunken (Frankfurt/M Germany) as a research engineer and since 1972 as the head of this department. In 1982 he joined the Electical Faculty of Kaiserslautem University where he presently is il professor of eletrical engineering and head of the Electrical Energy Supply Group. His special areas of interest are powersystem stability. power system protection and power system control. He is a member of VDE and serves as the chairman of Synchronous Machines Regulation and Excitation Systems Committee. (Univ. Kaisers-lautem FB Elektrotechnik. P.O. Box 304967618 Kaiserslautem T +49631/205-28 46 Fax +49631/205-21 68)

A study of power system transient stability enhancement through effective use of static VAR compensator is presented. It is shown that optimal state‐variable control can be approximately realized as a simple closed‐loop control based on locally measurable electric quantities. In order to make this regulation more effective and insensitive to the changes of the network parameters and loading condition it is proposed to use simple adaptive control with dynamic gain tuned by additional control loops. Tests done for two‐machine and multi‐machine systems have confirmed the validity and robustness of the proposed control method. Copyright © 1993 John Wiley & Sons, Ltd.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Digital adaptive control for servo system with unknown nonlinear friction

Digital adaptive control for servo system with unknown nonli...

引用

International Conference on Industrial Electronics, control and Instrumentation

作者： F. Ohkawa S. Sagara T. Yamashita M. Tomizukai Department of Control Engineering and Science Faculty of Computer Science and Systems Engineering Kyushu Institute of Technology Japan Department of Control Engineering Faculty of Engineering Kyushu Institute of Technology Kitakyushu Japan

The authors consider the design of a discrete time model reference adaptive control system (MRACS) for motion control systems with unknown nonlinear friction. From a control system viewpoint, the static and Coulomb frictions are characterized by a nonlinear dead-zone element and constant value disturbance for the control input signal, respectively. The discrete MRACS is considered for a nonlinear system which is a cascade combination of an unknown dead-zone block and a linear dynamic block with disturbance. In order to verify the validity of the theory, the design method described is applied to a servo system influenced by friction. Experimental results show the high control performance of the constructed MRACS and the effectiveness of the proposed method.< >

关键词： Adaptive control Servomechanisms Friction control systems Nonlinear control systems Motion control Nonlinear systems Nonlinear dynamical systems Torque control engineering

来源：评论

学校读者我要写书评

暂无评论

Classification of Gas-Liquid Two-Phase Flow Regime by an Ar-Model

引用

IFAC Proceedings Volumes 1992年第15期25卷 597-602页

作者： K. Inoue G.N. Rao A. Mizutori Y. Morita K. Sekoguchi Department of Control Systems Engineering Faculty of Computer Science and Systems Engineering Kyushu Institute of Technology Iizuka Fukuoka 820 Japan Department of Electronic Engineering Oita University Dannoharu Oita 870-11 Japan Department of Mechanical Engineering Osaka University Yamada-oka Suita Osaka 565 Japan

The discrimination of gas-liquid two-phase flow patterns has so far been made mainly by visual observation; and various flow parameters characterizing the flow, such as fluctuating pressures, void fraction etc., have been employed as quantitative tools for this purpose. It would be useful for the prediction and prevention of accidents experienced in thermal engineering plants dealing with the flow if it could be found the effective techniques for analyzing void fraction signals detected for diagnosing plant operation states. This paper presents pattern recognition and clustering techniques for analyzing the cross-sectional mean void fraction signals in gas-liquid two-phase flow based on an AR-model with bias components. The pattern recognition method based on the Bayes decision rule was applied for the recognition of flow regimes which were determined by visual observations. The clustering methods based on K-mean algorithm and mixture probability algorithm were applied for the determination of the new boundaries on a superficial gas-liquid velocities diagram. The effectiveness of the discussed techniques were confirmed.

关键词： pattern recognition clustering Bayes methods AR-model parameter estimation thermal plants multiphase flow void fraction

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：