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Affordability, logistics R&D and fleet systems

NAVAL ENGINEERS JOURNAL 1996年第3期108卷 199-213页

作者： Schulte, DP Skolnick, A He has supported the development and operation of several naval systems including advanced component selection for Trident II fire control and navigation systems. He served as branch manager of the Surface Ship ASW Combat System Branch which acted as the acquisition engineering agent for the AN/SQQ-89 Surface Ship Anti-Submarine Warfare Weapon System. He was then selected to manage the Module Engineering Department which provided engineering support to numerous naval systems including the AN/BSY-1 Submarine Combat System and the Trident II fire control and navigation system. He then served as the deputy program manager for NAVSEA Progressive Maintenance (2M/ATE). He holds a B.S. degree in Electrical Engineering from Purdue University and currently is pursuing a Maste's degree in Public Environmental Affairs at Indiana University—Purdue University Indianapolis. He served at Applied Physics Laboratory/The Johns Hopkins University in missile development then aboard USS Boston (CAG-1) and played leading roles in several weapon system developments (Regulus Terrier Tartar Talos) 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. He led the Navy's High Energy Lasers and Directed Energy Weapons development efforts. He was vice president advanced technology at Operations Research Inc. and vice president maritime engineering at Defense Group Inc. before starting SSC in 1991. Dr. Skolnick holds a B.S. degree in Mathematics and Economics Queens College an M.A. degree in Mathematics and Philosophy Columbia University an M.S. degree in Electrical/Aeronautical Engineering U.S. Naval Postgraduate School and a Ph.D. in Electrical Engineering and Applied Mathematics from Polytechnic University in New York. He is the author of many published papers on engineering design issues source selection procedures and large-scale complex technology problems

The Fleet continues to require high performance systems that can operate with dependability in the seas' unforgiving environments and under hostile action. Those demands are not new. What has changed is the urgent priority formerly assigned to national defense issues. The arguments for continued superpower military strength are now roiled in politics along with unsettled budgets and uncertain force level projections. Current expectations revolve about indefinite fiscal and operational issues (difficult funding constraints and broadband threats). In the actual event of ''doing more with less,'' a practical response is to apply the creative power available from sound engineering judgement and the crucible of experience to the immediate needs of the Fleet. The attempt to shorten the path between advanced development effort and Fleet use has been tried occasionally in the past, often, without exemplary results. The Sustainable Hardware and Affordable Readiness Practices (SHARP) program, is a generic R&D effort under OpNav sponsorship that has been working steadily on sensible solutions to product engineering problems. Armed today with fast-time, large-scale computation abilities and modern tools for technical problem solving coupled with specialized engineering knowledge, it has been refreshed and is underway satisfying existing Fleet needs. The relationship between fully responsive engineering services and current operational needs is always demanding. The connection between advanced engineering development (6.3 category funds) and immediate Fleet usage brings added complexity and challenge, both technical and organizational. Illustrative examples of affordable engineering solutions to ''retain, revise, replace or retire'' questions are presented within the context of both Fleet realities and budgetary limitations. The discussion covers legacy system support, civil/military considerations and Fleet maintenance issues. It describes the substantial and critical payoffs i

关键词： Warships

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Neural control of high performance drives: an application to the PM synchronous motor drive

Neural control of high performance drives: an application to...

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International Conference on Industrial Electronics, control and Instrumentation

作者： R. Krishnan R. Monajemy N. Tripathi Motion Control Systems Research Group The Bradley Department of Electrical Engineering Virginia Polytechnic Institute and State University Blacksburg VA USA

An increasing role of artificial neural networks (ANNs) in various engineering applications has spurred interest in power electronics and motor drives. In this paper, ANNs are utilized to achieve vector control end parameter compensation for the high performance control of the permanent magnet synchronous motor (PMSM). The overall system is capable of achieving concurrent mutual flux linkages and torque control in the presence of parameter variations and over a wide range of speed. A requirement of this system is an on-line estimation of the respective varying parameters. The proposed method is the most feasible and accurate for PMSM control. This study provides a generalized framework for ANN applications to high performance control of AC machines.

关键词： Synchronous motors Couplings Torque control control systems Machine vector control Motion control Artificial neural networks Motor drives AC machines Electric vehicles

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Impact of power factor correction on low power inverter-fed induction motor drive system

Impact of power factor correction on low power inverter-fed ...

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Annual IEEE Conference on Power Electronics Specialists (PESC)

作者： R. Krishnan D. Diamantidis S. Lee Motion Control Systems Research Group The Bradley Department of Electrical Engineering Virginia Polytechnic Institute and State University Blacksburg VA USA

Growing consciousness and need for drawing sinusoidal current from the utility, both for optimal utilization of the utility power plant capacity and to minimize harmonics injection into it, require the study of the impact of the power factor correction circuit on inverter-fed induction motor drive systems. This paper is concerned with such a study of a three phase PWM inverter-fed induction motor drive with single phase utility input, and with and without a power factor correction circuit. In the case of the study, detailed comparisons of system and induction motor efficiencies, inverter output voltage and current and input power factor, against rotor speed and output are made. A steady state model of the system including that of the inverter and power factor correction circuit, is developed as part of this study to predict the system performance for all kinds of loads. The analytical results are correlated to experimental results obtained from a prototype 1 HP induction motor drive system with speed feedback and constant Volts/Hz control strategy. It is found that the system performance with the power factor correction circuit is better than without it but only marginally in regard to system efficiency, and that too only from 0.7 p.u. speed and above for a fan type load. The paper also covers other types of common loads such as constant and frictional types.< >

关键词： Power factor correction Circuits Induction motor drives Pulse width modulation inverters System performance Power generation Power system harmonics Induction motors Voltage Reactive power

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PM brushless DC motor drive with a new power converter topology

PM brushless DC motor drive with a new power converter topol...

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Conference Record of the IEEE Industry Applications Society Annual Meeting (IAS)

作者： R. Krishnan S. Lee Motion Control Systems Research Group The Bradley Department of Electrical Engineering Virginia Polytechnic Institute and State University Blacksburg VA USA

With the growing potential for widespread use of permanent magnet brushless DC motor drives (hereafter referred to as PMBDC drives) in many low-cost applications such as in HVAC, refrigerators, and freezers in houses and small velocity servos in process industries, it has become important to minimize the cost. One obvious place for cost reduction is in the cost of the inverter and its associated controller. With that perspective, a novel application of the converter topology for the PMBDC known as C-dump in the switched reluctance motor drives is proposed in this paper. The advantages end disadvantages of this topology vis-a-vis the conventional three-phase H-bridge converter, are highlighted from the points of view of economy in switches, volt ampere rating, associated controller cost, and packaging. Design considerations for the PMBDC motor are derived for use with the proposed converter topology. The operational and design characteristics of this converter driven PMBDC drive are derived for four quadrant performance. Guidelines for the design of the proposed topology are derived and presented in the paper. Experimental results from a laboratory prototype are presented to validate the feasibility of the proposed PMBDC drive system.

关键词： Brushless DC motors Topology Costs Switching converters Reluctance motors Refrigerators Servomechanisms Inverters Switches Packaging

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An Experience of Innovation on Automation and control Technology Education

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IFAC Proceedings Volumes 1994年第9期27卷 165-168页

作者： C. Camiña E. García E. Ballester F Morant Polytechnic University of Valencia Departament of Systems Engineering Computers and Automatic Control P.OB. 22012_ E 46071 Valencia SPAIN

Since the course 1989-90 is being devetoped an experience of innovation on control and Automation education. The main aims of this experience are :To avoid the dispersionof subjects in an educational working day, to make sure the theory-practice integration to provide anactive and personal teaching to focus the student atention on the essential points of subject. The aim of this methodology isto favour the active learning so that each student takes the leading role of his own learning process. In this way, the teacher is the promoter of the work of students.

关键词： control Education Teaching Unit Learning systems Theory-Practice Integration Continuous Evaluation

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control engineering Solutions: An Experimental Approach

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IFAC Proceedings Volumes 1994年第9期27卷 133-135页

作者： P. Albertos R. Strietzel Department of Systems Engineering Computers and Control. Universidad Politécnica. Apdo.22012 Valencia Spain Fakultat Elektrotechnik Regelungs- und Steuenmgstheorie. University of Dresden. 011062 Dresden Germany

A new approach to teach and present control engineering problems is suggested. The main drawbacks of current methods are discussed and the guidelines to develop this approach are summarized. Particular attention is paid to the development of suitable laboratory experiments. This presentation is an introduction to the following papers in this workshop session.

关键词： Theory-Practice Integration systems Theory control engineering Topics Students Motivation Experimental set-ups

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MAIN PROPULSION POWER TAKE-OFF CONFIGURATION FOR AN ETC GUN PULSED-POWER GENERATOR

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NAVAL ENGINEERS JOURNAL 1994年第3期106卷 52-58页

作者： PETTERSEN, KE BIELITZ, CL CIANCI, J Kenneth E. Pettersen:graduated from the University of Maryland Baltimore County in J 978. He is a mechanical engineer in the power systems directorate of the Annapolis Detachment Carde-rock Division Naval Surface Warfare Center (formerly David Taylor Research Center) and has been with the Department of the Navy since 1981. Mr. Pettersen worked for the Naval Sea Systems Command from May 1981 until June 1985. He has been employed with NSWC Annapolis Detachment since June 1985. Charles L. Bielitz:is a mechanical engineer in the mechanical transmissions branch of Annapolis Detachment Carderock Division Naval Surface Warfare Center where he has worked for the past six years. He received his BSME from Virginia Polytechnic Institute in 1981. Prior to joining NSWC Annapolis he was employed by the General Electric Company in the medium steam turbine department. John Cianci:received his ASME from Tufts University in 1958 and his BSME from Tufts University in 1962. Mr. Cianci joined General Electric in 1954. He has thirty-seven years of experience in design manufacturing testing installation and customer support of high speed high power industrial marine and Navy gearing bearings couplings and lube systems. His experience includes positions of both engineer and manager in the areas of gear design gear products quality control and gear manufacturing engineering he is currently technical leader Gear Development Programs. He is a member of the American Gear Manufacturers Association and is on the Marine and High Speed Gearing committees.

Electro-Thermal Chemical (ETC) Gun technology will increase the range and capabilities of existing CIWS and 5 inch guns. Because of their faster, yet more controllable acceleration, ETC guns will allow for the utilization of smart munitions and, in the case of the 5 inch guns, increase range to beyond 50 nautical miles. This paper examines five power take-off (PTO) gear configurations from a surface ship class main reduction gears (MRG's) which drive a nominal 10 Megawatt (MW) Pulsed Power (PP) generator. The PP generator is utilized to charge a capacitor-based pulsed forming network (PFN) which, in turn, provides an electrical pulse to the cartridge of a munition at the breech of an ETC gun upon demand. The PTO gear and resultant placement of the generator will be the major focus of this paper. Major issues that will be examined will include space constraints within the main engine and auxiliary machinery rooms, gear sizing, survivability, shock and vibration, the penetration of watertight bulkheads with high speed shafting and equipment accessibility. Also, design guidelines for the PP generator will be provided. Special emphasis will be placed on the connection of the PTO gear to the MRGs.

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Measurements of power and current components in unbalanced and distorted three‐phase systems

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European Transactions on Electrical Power 1993年第1期3卷 75-83页

作者： Andria, G. Salvatore, L. Savino, M. Trotta, A. Dr. Gregorio Andria (1956) AEI received the M. S. degree in Electrical Engineering from the State University of Bari/Italy in 1981 and the Ph. D. degree in Electrical Engineering in 1987 from the same University. From 1981 to 1983 he was working in the Electrotechnics and Electronics Department of the University of Bari as a member of the research team on electrical measurements. From 1984 to 1986 he was a Doctoral Fellow and currently he is a researcher in the same department. His research interests are in the fields of electrical and electronic measurements on components and systems including digital measurements for the analysis of electrical quantities in non-sinusoidal systems and the design of integrated optical sensors for measurement and control of non-electrical physical quantities. (Department of Electrotechnics and Electronics Faculty of Engineering polytechnic of Bovia E. Orabona 4 1-70125 Bari. Italy T +3980/242266 Fax + 3980/242410) Prof. Luigi Salvatore (1945) AEI received the degree in electrical engineering from the University of Bari/Italy in 1970. Since 1976 he has worked in the Electrotechnical and Electronic Department of the same University as a member of the research team on electrical machines. From 1983 to 1987 he was a researcher of electrical machines in the same department. Since 1987 he has been an Associate Professor of electrical machines at the University of Bari. At the present time his research interests include the control monitoring and diagnostics of AC drives and the areas of signal processing anddigital measurements on power electronics systems. (Department of Electrotechnics and Electronics Faculty of Engineering Polytechnic of Bari via E. Orabona 4 I-70125 Bari Italy T + 3980/242258 Fax + 3980/242410) Prof. Mario Savino (1947) AEI received the degree in Electrical Engineering from the University of Barif Italy in 1971. Since then he has been working in the Electrotechnical Institute of Bari until 1973 as researcher from 1973 to 1982 as Assistant Profe

The paper deals with the instantaneous power theory in three‐phase circuits by using the instantaneous time phasors of voltage and current. Particularly it is shown that the instantaneous components of the current time‐phasor in a rotating reference frame p‐q, oriented in such a way that the instantaneous voltage time‐phasor points to the p‐axis direction, represent the active and reactive currents. These components give rise to instantaneous real and imaginary powers, respectively. The spectral analysis of the above‐mentioned time‐phasors gives the harmonic symmetrical components of positive and negative sequence of voltage and current three‐phase systems. The line‐by‐line product of the voltage sequence spectrum by the complex conjugate of the current sequence spectrum gives the DC components of the instantaneous real and imaginary powers. The paper shows also that the instantaneous active and reactive currents are different from those defined on grounds of the Fryze's theory, which can be determined from the voltage and current sequence spectra. Copyright © 1993 John Wiley & Sons, Ltd.

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RECONSTRUCTION OF LINEAR AND NONLINEAR CONTINUOUS-TIME MODELS FROM DISCRETE-TIME SAMPLED-DATA systems

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MECHANICAL systems AND SIGNAL PROCESSING 1992年第1期6卷 69-84页

作者： TSANG, KM BILLINGS, SA Department of Electrical Engineering Hong Kong Polytechnic Hung Hom Kowloon Hong Kong Department of Automatic Control and Systems Engineering University of Sheffield Sheffield S1 3JD U.K.

A new approach for identifying continuous time models from discrete time sampled-data records is presented. The proposed method involves estimating and validating a discrete time model, linear or non-linear, based on sampled data records, evaluating the discrete time linear and non-linear frequency response functions and then curve fitting to the frequency response data to yield a continuous time model. No numerical differentiation and integration is involved and hence higher derivatives of input and output data records are avoided. Errors which would be introduced by the numerical approximation of differentiation and integration are therefore eliminated. The orthogonal estimator which is introduced to curve fit to the complex frequency response functions provides information on the model structure and the unknown parameter values for linear and non-linear continuous time models. The advantage of this approach is that non-linear differential equation models which can be related to the physical behaviour of the system can be readily computed from discrete time data.

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Application of AI and model building techniques to software engineering

Application of AI and model building techniques to software ...

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IEE Colloquium on Software engineering and AI (Artificial Intelligence) (Digest No.087)

作者： S. Bennett D.A. Linkens E.B. Tanyi A. Scott Department of Electrical Engineering Electronics & Control. The National Polytechnic University of Yaounde I Cameroon Department of Automatic Control & Systems Engineering University of Sheffield Sheffield UK

The authors have been working on the use of AI techniques to support modelling and simulation of dynamic systems and have developed a demonstration environment KEMS (Knowledge-based Environment for Modelling and Simulation) which is based on the idea of re-usable components. Once the structure of the model is established, KEMS generates automatically the simulation code. The fundamental ideas in KEMS arise from consideration of methodologies for applying AI to the construction of models and hence they have also considered how the techniques can be applied to model-based software engineering methodologies for specification and design of software. They discuss the structure of KEMS, knowledge acquisition and the application to software specification and construction using MASCOT.< >

关键词： Software requirements and specifications Knowledge acquisition Knowledge based systems Software engineering Software reusability

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