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MAGNETOHYDRODYNAMIC SUBMARINE PROPULSION systems

NAVAL ENGINEERS JOURNAL 1991年第3期103卷 141-157页

作者： SWALLOM, DW SADOVNIK, I GIBBS, JS GUROL, H NGUYEN, LV VANDENBERGH, HH Daniel W. Swallomis the director of military power systems at Avco Research Laboratory Inc. a subsidiary of Textron Inc. in Everett Mass. Dr. Swallom received his B.S. M.S. and Ph.D. degrees in mechanical engineering from the University of Iowa Iowa City Iowa in 1969 1970 and 1972 respectively. He has authored numerous papers in the areas of power propulsion and plasma physics and currently is a member of the Aerospace Power Systems Technical Committee of the AIAA. Dr. Swallom has directed various programs for the development of advanced power generation systems lightweight power conditioning systems and advanced propulsion systems for marine applications. His previous experience includes work with Odin International Corporation Maxwell Laboratories Inc. Argonne National Laboratory and the Air Force Aero Propulsion Laboratory. Currently Dr. Swallom is directing the technical efforts to apply magnetohydrodynamic principles to a variety of propulsion and power applications for various marine vehicles and power system requirements respectively. Isaac Sadovnikis a principal research engineer in the Energy Technology Office at Avco Research Laboratory Inc. a subsidiary of Textron Inc. He received his B.S. in engineering (1974) B.S. in physics (1975) M.S. in aeronautics and astronautics (1976) and Ph.D. in physics of fluids (1981) at the Massachusetts Institute of Technology. Dr. Sadovnik has been involved in research work funded by DARPA concerning the use of magnetohydrodynamics for underwater propulsion. He has built theoretical models that predict the hydrodynamic behavior of seawater flow through magnetohydrodynamic ducts and their interaction with the rest of the vehicle (thrust and drag produced). In addition Dr. Sadovnik has been involved in research investigations geared toward the NASP program concerning the use of magnetohydrodynamic combustion-driven accelerator channels. Prior to joining Avco Dr. Sadovnik was a research assistant at MIT where he conducted experimental and

Magnetohydrodynamic propulsion systems for submarines offer several significant advantages over conventional propeller propulsion systems. These advantages include the potential for greater stealth characteristics, increased maneuverability, enhanced survivability, elimination of cavitation limits, greater payload capability, and the addition of a significant emergency propulsion system. These advantages can be obtained with a magnetohydrodynamic propulsion system that is neutrally bouyant and can operate with the existing submarine propulsion system power plant. A thorough investigation of magnetohydrodynamic propulsion systems for submarine applications has been completed. During the investigation, a number of geometric configurations were examined. Each of these configurations and mounting concepts was optimized for maximum performance for a generic attack class submarine. The optimization considered each thruster individually by determining the optimum operating characteristics for each one and accepting only those thrusters that result in a neutrally buoyant propulsion system. The results of this detailed optimization study show that the segmented, annular thruster is the concept with the highest performance levels and greatest efficiency and offers the greatest potential for a practical magnetohydrodynamic propulsion system for attack class submarines. The optimization study results were used to develop a specific point design for a segmented, annular magnetohydrodynamic thruster for an attack class submarine. The design point case has shown that this thruster may be able to provide the necessary thrust to propel an attack class submarine at the required velocity with the potential for a substantial acoustic signature reduction within the constraints of the existing submarine power plant and the maintenance of neutral buoyancy. This innovative magnetohydrodynamic propulsion system offers an approach for submarine propulsion that can be an important contributio

关键词： Ship Propulsion

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Plaquette percolation for lattice gauge theory

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Nuclear Physics B (Proceedings Supplements) 1990年第C期17卷 603-606页

作者： Brower, Richard C. Huang, Suzhou Moriarty, Kevin J.M. Electrical Computer and Systems Engineering Physics Departments Boston MA 02215 United States Department of Mathematics Statistics and Computer Science Dalhouse University Halifax NS Canada

A new Monte Carlo dynamics is proposed for Z2 lattice gauge based on the percolation of spanning surfaces, analogous to the percolation of clusters used in the Swendsen-Wang algorithm for the Potts model. In three dim...

A new Monte Carlo dynamics is proposed for Z₂ lattice gauge based on the percolation of spanning surfaces, analogous to the percolation of clusters used in the Swendsen-Wang algorithm for the Potts model. In three dimensions, the resulting dynamical exponent for critical slowing down is reduce to z = 0.61 ± 0.05 relative to the heat bath exponent of z = 2.1 ± 0.2. Extensions to continuum gauge theories in higher dimensions are discussed. © 1990.

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Intelligent control of an autonomous mobile robot in a hazardous material spill accident ȁ4;a blackboard structure approach

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Robotics and Autonomous systems 1990年第4期6卷 351-365页

作者： Pang, Grantham K.H. Shen, Helen C. Department of Electrical and Computer Engineering University of Waterloo WaterlooOntarioN2L 3G1 Canada Pattern Analysis and Machine Intelligence Group Department of Systems Design Engineering University of Waterloo WaterlooOntarioN2L 3G1 Canada

This paper describes the use of the blackboard architecture for the high level programming and control of autonomous mobile robots in a hazardous material spill emergency situation. The purpose of the robot is to perform some of the tasks which are dangerous for the emergency response personnels. The proposed blackboard system provides a unifying framework for the integration of information from various sensor-based and knowledge-based sub-systems. © 1990 Elsevier Science Publishers B.V. (North-Holland) All rights reserved

关键词： Hazardous materials spills

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Single layer potential function neural network for unsupervised learning

Single layer potential function neural network for unsupervi...

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International Joint Conference on Neural Networks (IJCNN)

作者： A.L. Dajani M. Kamel M.I. Elmastry Department of Electrical and Computer Engineering University of Waterloo Waterloo ON Canada Department of Systems Design Engineering University of Waterloo Waterloo ON Canada

A variant of the generalized delta rule training algorithm is presented for unsupervized learning in a single-layer network using Gaussian function nonlinearities. An alternative to direct competition between the output nodes that allows linear instead of quadratic complexity in the connections of the output nodes is proposed. The connecting weights are adaptively modified with each presentation of an input pattern and converge towards values that are representative of the clustering structure of the input data. In order to calculate the weight increment, the training algorithm uses locally available information at the synapse and its connecting neuron. The training algorithm, coupled with the alternative competition approach, eliminates the need for an orienting subsystem such as that needed in the ART1 model of G.A. Carpenter and S. Grossberg (1988)

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Identification of faulty processing elements by space-time compression of test responses

Identification of faulty processing elements by space-time c...

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IEEE International Test Conference

作者： M.G. Karpovsky L.B. Levitin F.S. Vainstein Research Laboratory of Design and Testing of Computer Hardware Department of Electrical Computer and Systems Engineering Boston University Boston MA USA

A novel approach to the identification of a faulty processing element, based on an analysis of the compressed response of the system, is proposed. The test response is compressed first in space and then in time, and a faulty processing element is identified by a hard-decision decoding of the corresponding space-time signature. The overhead analysis and the solution for the hardware minimization problem are presented for several important classes of systems. The proposed method results in considerable hardware savings.< >

关键词： Fault diagnosis System testing Hardware design engineering Decoding Laboratories systems engineering and theory Educational institutions Vectors System buses

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Diagnosing CMOS bridging faults with stuck-at fault dictionaries

Diagnosing CMOS bridging faults with stuck-at fault dictiona...

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IEEE International Test Conference

作者： S.D. Millman E.J. McCluskey J.M. Acken Motorola Inc. Mesa AZ USA Center for Reliable Computing Computer Systems Laboratory Departments of Electrical Engineering and Computer Science University of Stanford Stanford CA USA Schlumberger Technologies Palo Alto CA USA Intel Corporation Santa Clara CA USA

It is shown that the traditional approach to diagnosing stuck-at faults with fault dictionaries generated for stuck-at faults is not appropriate for diagnosing CMOS bridging faults. A novel technique for using stuck-at-fault dictionaries to diagnose bridging faults is described. Teradyne's LASAR was used to simulate bridging and stuck-at faults in a number of combinational circuits, including parity trees, multiplexers, and the 74ASCI181 4-b, 16-function ALU (arithmetic and logic unit). When the traditional technique was used, between 30%-50% of the bridging faults were mis-diagnosed, with the presence of a failure indicated on a fault-free node. In addition, as the stuck-at-fault diagnostic ability of a test increased, the bridging fault diagnostic ability decreased. By use of the new technique. over 92% of the bridging faults in the circuits used for this research were diagnosed correctly and less than 4% led to misleading diagnoses.< >

关键词： Dictionaries Circuit faults Fault diagnosis Circuit testing Fault detection Laboratories Semiconductor device modeling CMOS technology Computational modeling Circuit simulation

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SHIP SERVICE electrical systems - designING FOR SURVIVABILITY

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NAVAL ENGINEERS JOURNAL 1990年第5期102卷 32-36页

作者： CERMINARA, J KOTACKA, RO John Cerminara:is a principal engineer with Westinghouse Machinery Technology Division Electrical Systems Department. He holds a B.S. degree in electrical engineering from the University of Pittsburgh. He is a registered professional engineer and a member of IEEE ASNE and the Ship Steering Group of the Combat Survivability Division of ADPA. Mr. Cerminara has had over 30 years of multidiscipline experience ranging from engineering and construction in heavy industry to standards and publications. Past assignments include DOE/ NASA wind turbine project manager for Westinghouse and task leader of MTD electrical systems. Most recent assignments have included hull mechanical and electrical (HM&E) distributive system survivability analyses of the LSD-41 mobility mission area and application and validation of NavSea computer-aided design of Survivable Distributive System (CADSDiS) Program. Rolf O. Kotacka:is presently a ship systems engineer in the Ship Systems Engineering Branch of the Naval Sea Systems Command Engineering Directorate where his primary responsibility is ship system survivability. He is a 1977 graduate of SUNY Maritime College where he received his bachelor of engineering degree in marine electrical engineering as well as a U.S. Coast Guard Third Assistant Engineer License and a commission in the U. S. Naval Reserve. Upon graduation Mr. Kotacka was employed by Charleston Naval Shipyard as a field engineer until 1981 where he gained his background in surface ship HM&E systems and equipment. He then transferred to the Supervisor of Shipbuilding Conversion and Repair Groton where he served as a senior electrical engineer monitoring the design and construction of Trident and 688 class submarines and received the Meritorious Unit Citation. Prior to his present position Mr. Kotacka was the life cycle manager for diesel generator sets in the Naval Sea Systems Command's Generators Branch. He has coauthored several papers dealing with power generation for ASE and SNAME. Mr. Kotacka is also a lieutena

This paper highlights the survivability concerns in the design of ship service power systems. The paper gives a brief description of what constitutes a typical ship service electric power system and concentrates on electric power generation and associated controls. Established survivability design principles and guidelines are highlighted and the application of those guidelines are discussed. General Specifications (Gen Specs) for Ships of the U.S. Navy are cited as the cornerstone for design. Specific design criteria are cited as well as the rationale associated with the survivability design guidelines pertaining to power generation and distribution. The application of these survivability design guidelines plus the use of the deactivation diagram/damage tolerance analysis cited in the Gen Spec section 072e will enhance overall design and help ensure survivable electric power systems for surface combatants.

关键词： Warships

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COMPARING BARRIER ALGORITHMS

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PARALLEL COMPUTING 1989年第2期12卷 157-170页

作者： ARENSTORF, NS JORDAN, HF Computer Systems Design Group Department of Electrical and Computer Engineering University of Colorado Boulder CO 80309 U.S.A.

A barrier is a method for synchronizing a large number of concurrent computer processes. After consideration of some basic synchronization mechanisms, a collection of barrier algorithms with either linear or logarithmic depth will be presented. A graphical model is described that profiles the execution of the barriers and other parallel programming constructs. This model shows that in order to achieve the best performance, different situations call for different barrier implementations. Timing experiments supporting these conclusions are detailed.

关键词： Barrier graphical model MIMD computer shared memory speedup synchronization

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GABRIEL - A design ENVIRONMENT FOR DSP

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IEEE TRANSACTIONS ON ACOUSTICS SPEECH AND SIGNAL PROCESSING 1989年第11期37卷 1751-1762页

作者： LEE, EA HO, WH GOEI, EE BIER, JC BHATTACHARYYA, S Department of Electrical Engineering and Computer Science University of California Berkeley CA USA IC Research and Development Division Cadence Design Systems Inc. Santa Clara CA USA

Gabriel is a software system intended to manage the com- plete development of real-time DSP applications, from conceptualiza- tion and experimentation, down to implementation in real-time hard- ware. It performs nonreal-time simulations, as well as code synthesis for real-time hardware. It is intended to ease code development for architectures that are not easy targets for conventionalcompilers, such as multiprocessor systems built with very high-performance micro- coded DSP’s. The system is designed to be retargetable in two ways. First, it can synthesize code for a variety of multi-DSP architectures where the user specifies the salient features of the architecture. Sec- ond, it can target different DSP’s. We have concentrated on code gen- eration for the Motorola DSP56001, although code generation for the AT&T DSP32 has been demonstrated. At the highest level, an algo- rithm is described using a hierarchical block diagram. At the lowest level, the user can either simulate the algorithm locally on the work- station, simulate the target architecture running the generated code, or download the code into hardware and run it in real time. When the target architecture has more than one processor, the task partitioning and synchronizationare done automaticallyusing synchronousdutajlow techniques. Gabriel is, therefore, capable of handling multiple sample rates, iteration, and recurrences.

关键词： .iteration targets granularity data flow code generation Motorola DSP sample rates ACOUSTICS SPEECH block diagrams Environment for DSP real-time hardware changes in sample

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Generalized access control strategies for token passing systems

Generalized access control strategies for token passing syst...

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IEEE Annual Joint Conference: INFOCOM, IEEE computer and Communications Societies

作者： J.W.M. Pang F.A. Tobagi Computer Systems Laboratory Departments of Electrical Engineering and Computer Science University of Stanford Stanford CA USA

A very large class of access control strategies is proposed and studied for token passing systems, generalized from the timer-based approach. The idea is to assign transmission quotas dependent on past service times to control the token cycles dynamically while utilizing the token channel efficiently. The dynamics inherent in the control scheme are identified as an important issue and, under heavy load and a few other assumptions, it is shown that the proposed strategies have stable dynamics. Furthermore, the ability of the proposed strategies to control the token cycles is demonstrated. Theoretical results are derived, followed by a thorough discussion on the crucial properties of the new strategies.< >

关键词： Access control Access protocols Local area networks Network servers FDDI Upper bound Aerodynamics Switches computer interfaces computer networks

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