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Developing a prototype concurrent design tool for composite topside structures

NAVAL ENGINEERS JOURNAL 1997年第3期109卷 279-290页

作者： Dirlik, S Hambric, S Azarm, S Marquardt, M Hellman, A Bartlett, S Castelli, V Steve Dirlik:began his career at the Naval Surface Warfare Center Carderock Division in 1981 as an aerospace engineer co-op student. He completed his bachelor of science degree in aeropace and ocean engineering from Virginia Polytechnic Institute and State University in 1985 and his master of science degree in aerospace engineering from the University of Maryland in 1990. Mr. Dirlik recently completed a master of science program in applied physics at The Johns Hopins University and currently works in the Radar Cross Section and Target Physics Branch of the Signatures Directorate at the Naval Surface Warfare Center Corderoke Division. He has worked on Navy low observable programs since 1990. Stephen Hambric:is a research associate at the Applied Research Laboratory at The Pennsylvania State University. He received his B. S. and M.S. degree in mechanical engineering from Virginia Polytechnic Institute and State University and his D. Sc. in mechnical engineering from the George Washington University. He has worked on several computer aided multidiscikplinary design and optimization projects over the years including an automated propeller design system and a structural acoustic optimization capability. Dr. Shpour Azarm:is currently working as an associate professor with the Design and Manufacturing Group of the Department of Mechanical Engineering at the University of maryland at College Park. Dr Azarm's expertise is in the areas of optimization-based designed and concurrent design and optimization of multidisciplinary systems. He was a consultant at Black & Decker Corporation (summer 1996) and worked as a Navy senior summer faculty fellow (summer 1995) and a NASA summer faculty fellow (summer 1994). He was a visiting scientist at NASA Langley Research Center for Multidisciplinary Analysis and Applied Structural Optimzatiom at the University of Siegen in Germany (spring 1992) and the Design Institute of the Technical University of Denmark (summer 1990). Dr Azarm was an associate technical editor of the ASME Jour

A prototype concurrent engineering tool has been developed for the preliminary design of composite topside structures for modern navy warships. This tool, named GELS for the Concurrent engineering of Layered Structures, provides designers with an immediate assessment of the impacts of their decisions on several disciplines which are important to the performance of a modern naval topside structure, including electromagnetic interference effects (EMI), radar cross section (RCS), structural integrity, cost, and weight. Preliminary analysis modules in each of these disciplines are integrated to operate from a common set of design variables and a common materials database. Performance in each discipline and an overall fitness function for the concept are then evaluated. A graphical user interface (GUI) is used to define requirements and to display the results from the technical analysis modules. Optimization techniques, including feasible sequential quadratic programming (FSQP) and exhaustive search are used to modify the design variables to satisfy all requirements simultaneously. The development of this tool, the technical modules, and their integration are discussed noting the decisions and compromises required to develop and integrate the modules into a prototype conceptual design tool.

关键词： Warships

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Influence of human engineering on manning levels and human performance on ships

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NAVAL ENGINEERS JOURNAL 1997年第5期109卷 67-76页

作者： Anderson, DE Oberman, FR Malone, TB Baker, CC David E. Anderson:has a bachelor of science degree in environmental engineering from Florida Technological University and a master's degree in environmental engineering from the University of Central Florida. He is a graduate of the Naval Sea Systems Command's Engineer-In-Training (EIT) Program. Mr. Anderson was instrumental in introducing the collective protection system (CPS) in the U.S. Navy developing the initial forward-fit package for the USS Gunston Hall and the engineering change proposal (ECP) for the USS Wasp. In 1990 he joined the Human Systems Integration (HSI) Division (SEA 55W5) where he was task leader for auxiliary ships. He is currently the HSI manager for the future technology variant of the SeaLift ship and the future carrier. Association of Scientists and Engineers 33rdAnnual Technical Symposium 26 April 1996. Fred R. Oberman:has B.A. and M.A. degrees from the University of Chicago and Loyola University (experimental psychology) and an M.S. degree in industrial engineering and operations research from Virginia Polytechnic Institute (VPI). He has more than 30 years experience in HSI management planning research analysis design and testing in government and private sector positions. He is currently responsible for NavSea HSI generic research and tool development efforts. He is responsible for Human Engineering Specifications and Standards (Commercial Hypertext) and is the NavSea 03D7 representative on HSI in Performance Specifications and for integration of HSI within Integrated Logistic Support (ILS). He has served as DoD HSI SubTAG chair and member of the Simulation and Modeling Test and Evaluation Display and Control Systems Human Computer Interaction Specifications and Standards and Systems Design Sub Tags as a member of the Society of Naval Architects and Marine Engineers (SNAME) Systems Safety Panel and a member of NATO RSG 14 on man-machine analysis. Thomas B. Malone: CHFEP received a Ph.D. in experimental psychology from Fordham University in 1964. He is president of Carlow

The objectives of Human engineering (HE) are generally viewed as increasing human performance, reducing human error, enhancing personnel and equipment safety, and reducing training and related personnel costs. There are other benefits that are thoroughly consistent with the direction of the Navy of the future, chief among these is reduction of required numbers of personnel to operate and maintain Navy ships. The Naval research Advisory Committee (NRAC) report on Man-Machine Technology in the Navy estimated that one of the benefits from increased application of man-machine technology to Navy ship design is personnel reduction as well as improving system availability, effectiveness, and safety The objective of this paper is to discuss aspects of the human engineering design of ships and systems that affect manning requirements, and impact human-performance and safety The paper will also discuss how the application of human engineering leads to improved performance, and crew safety, and reduced workload, all of which influence manning levels. Finally, the paper presents a discussion of tools and case studies of good human engineering design practices which reduce manning.

关键词： Human engineering

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Phase stabilization of reference signals in analog fiber-optic links

Phase stabilization of reference signals in analog fiber-opt...

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International Topical Meeting on Microwave Photonics (MWP)

作者： M. Shadaram V. Gonzalez J. Ceniceros N. Shah J. Mayers S. Pappert D. Lafaw Electrical and Computer Engineering Department University of Texas El Paso El Paso TX USA Control and Ocean Survedhce Center Research Development Test & Evaluation Division Naval Command San Diego CA USA Laboratory of Physical Science College Park MD USA

A feedback technique that utilizes a special optical modulator is used to reduce the phase noise of RF signals in microwave fiber-optic links. Experimental results indicate a reduction in the phase noise of a 150 MHz ... 详细信息

关键词： Phase noise Frequency Optical receivers Optical feedback Optical modulation Optical noise Phase modulation Optical transmitters Phase detection Optical sensors

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First passage risk-sensitive criterion for stochastic evolutions

First passage risk-sensitive criterion for stochastic evolut...

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American control Conference (ACC)

作者： C.D. Charalambous J.L. Hibey Measurement and Control Engineering Research Center College of Engineering Idaho State University Pocatello ID USA Department of Electrical and Computer Engineering Old Dominion University Norfolk VA USA

The purpose of this paper is to investigate in an infinite dimensional space, the first passage problem with a risk-sensitive performance criterion, and to illustrate the asymptotic behavior of the associated value function, as related to differential games arising in robust control theory. The model of interest is described by a controlled stochastic evolution with small Wiener noise intensity. The Wiener and state processes take values in infinite dimensional Hilbert spaces. The objective is to control the evolution of the state process, so as to keep it in some compact set G. By using a logarithmic transformation, it is shown that in the limit as the small noise parameter, /spl epsiv//spl rarr/0, the risk-sensitive value function converges to the value of a deterministic differential game. In the limit as the risk parameter, /spl theta//spl rarr/0, the risk-sensitive value function converges to the value function corresponding to the mean escape time problem. In addition, a lower bound on the first escape time is derived which is slightly different from the known bound for finite dimensional systems. The magnitude of the lower bound derived here, increases as /spl theta/ increases, thus robustness is achieved.

关键词： Stochastic processes Hilbert space Equations Electric variables measurement control engineering Educational institutions Game theory Robust control Stochastic resonance Robustness

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A pictorial pattern recognition based on an associative memory by use of the reaction-diffusion equation

A pictorial pattern recognition based on an associative memo...

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International Symposium on Autonomous Decentralized Systems (ISADAS)

作者： S. Ito H. Yuasa K. Ito M. Ito Bio-Mimetic Control Research Center Institute for Physical and Chemical Research Nagoya Japan School of Engineering University of Nagoya Nagoya Japan Department of Information and Computer Science Toyohashi University of Technology Japan School of Engineering Chubu University Japan

Visual information processing in biological systems is performed simultaneously and in parallel at each neural unit. That is, a global task with no supervisor is achieved by the interaction among many subsystems. In this sense, the visual process shares the common functional structure with 'autonomous decentralized systems' which have attracted much attention in the field of system engineering. We attempt to design a pictorial pattern recognition system based on the concept of the autonomous decentralized system. The local interaction among subsystems is described by reaction-diffusion equations, in which each subsystem utilizes only the neighboring information around itself.< >

关键词： Pattern recognition Associative memory Information processing Biological systems Systems engineering and theory Equations

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A study on the design and characteristics of the high frequency resonant inverter for ultrasonic motor drive using fuzzy controller

A study on the design and characteristics of the high freque...

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International Conference on Industrial Electronics, control and Instrumentation

作者： In-Su Cha Hae-Am Park Gwon-Jong Yu Young-Dong Kim Hyung Lae Baek Department of Electric & Electronic Engineering Dong Shin University Choongnam South Korea Department of Computer & Information Processing Kwangju Institute of Science and Technology Kwangju South Korea Department of Photovoltaic System Korea Institute of Energy and Research Daejeon South Korea Department of Control & Measurement Engineering Chosun University Sesekdong South Korea Department of Electrical Engineering Chosun University Sesekdong South Korea

ISBN: (纸本)0780330269

In the present paper, a fuzzy logic based ultrasonic motor (USM) is used in order to properly control the speed and phase difference for the elasticity and viscosity of a robot joint. The traveling wave USM is driven by two-phase sine wave signals, and the phase difference of the signals is usually selected to +90/spl deg/ and -90/spl deg/ meaning high speed and maximum torque of the USM. In this paper, we describe USM rotational speed characteristics at no load. The first phase difference is adjusted in the range from +90/spl deg/ to -90/spl deg/ by fuzzy controller as is the reached target speed.

关键词： Resonant frequency Resonant inverters

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OPTIMUM FREQUENCY REUSE IN MOBILE TELEPHONY SYSTEMS

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INTERNATIONAL JOURNAL OF COMMUNICATION SYSTEMS 1995年第3期8卷 185-190页

作者： KAZANTZAKIS, MG DEMESTICHAS, PP ANAGNOSTOU, ME National Technical University of Athens Computer Science Division Department of Electrical and Computer Engineering Heroon Polytechneiou 9 Zografou Athens 15773 Greece Michael G. Kazantzakii was born in Athens Greece in 1962. He received both the Diploma and Ph.D. Degree from the Electrical Engineering Department of the National Technical University of Athens in 1986 and 1992 respectively. During the period 1992–1993 he was a member of the Staff of the Hellenic Navy Research Centre working in the area of underwater acoustics. Since 1994 he has been a researcher at the National Technical University of Athens Department of Electrical Engineering and Computer Science Telecommunications Laboratory. His interests include data mobile and integrated services networks. Panagiotis P. Demestichas was born in Athens Greece in 1967. He received the Diploma in electrical engineering from the National Technical University of Athens (NTUA) Athens in 1993. At present he is a research assistant at NTUA working towards his Ph.D. dissertation. He participated in the BRITE/EURAM-EURATN and in the RACE-TOMQAT and MONET projects. His research interests are in the areas of broadband and mobile networks queueing theory algorithms and complexity theory. He is a Member of the Technical Chamber of Greece. Miltiades E. Anagnostou was born in Athens in 1958. He received the Electrical Engineers Diploma from the National Technical University of Athens (NTUA) in 1981. During the period 1981–1987 he was a teaching assistant at NTUA. In 1987 he received his Ph.D. in the area of computer networks. In 1987–1989 he served the Greek army in the Air Force Research and Development Center. In 1989–1991 he was a Lecturer and since 1991 he has been an Assistant Professor in the Computer Science Division Department of Electrical and Computer Engineering of the NTUA. He teaches courses on modern telecommunications formal specification of protocols stochastic processes and queueing theory. Since 1981 Dr. Anagnostou has been involved

The reason why cellular mobile telephony systems exist is that they allow frequency reuse. Dynamic allocation algorithms improve the network efficiency and the service quality. Dynamic allocation is closely related to the following instantaneous allocation problem: given a number of channels (frequencies), a cell structure and the number of calls to be accommodated in each cell, find the optimum allocation of channels to cells subject to restrictions concerning the distance of cells, where the same frequency can be reused. In this paper we formulate and solve this problem by showing that it can be reduced to a 0-1 programming problem. Finally we present results, and draw subsequent conclusions.

关键词： MOBILE TELEPHONY FREQUENCY ALLOCATION UMTS

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FAULT-TOLERANT ASSOCIATE MEMORIES

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SYSTEMS AND computerS IN JAPAN 1995年第7期26卷 1-12页

作者： FUJIWARA, E TANAKA, T Member Faculty of Engineering Tokyo Institute of Technology Tokyo Japan 152 Eui Fujiwara:received his B.S. and M.S. degrees in Electronics Engineering in 1968 and 1970 respectively and his Dr. of Eng. degree in 1981 all from Tokyo Institute of Technology. In 1970 he joined the NTT Musashino Electrical Communication Laboratories and engaged in developing PIPS-1 and PIPS-11 computer systems. In 1988 he joined the Department of Computer Science Tokyo Institute of Technology as an Associate Professor. In 1990 he became a full Professor. He was a Visiting Professor at the Center for Advanced Computer Studies the University of Southwestern Louisiana from June 1985 to July 1986. His current research interests include coding theory for computers fault-tolerant memories VLSI defect-toleranceand WSI systems. He is a co-author ofError Control Coding for Computer Systems(Prentice-Hall1989) EssentiaLF of Error-Correcting Coding Techniques (Academic Press 1990) and other books. Dr. Fujiwara received the Young Engineer Award from the I.E.I.C.E. in 1978 and the Teshima Memorial Research Award in 1991. He is a senior member of the IEEE and a member of the Information Processing Society Japan. Associate Member

Because of its capability of high-speed search, the associative memory (CAM) is expected to be used in a variety of information processing systems. In this paper, novel fault-tolerant techniques which are effective for on-line use are proposed for TLB which is an example of the application of CAM. First, fault and error models of the TLB consisting of the CAM part and the SRAM part are clarified. Then, the fault-tolerant techniques for these faults and errors, such as distance separable technique, cod-ing technique, simplified 1-out-of-n check and graceful degradation, are proposed. The distance separable technique which encodes the data stored in the CAM part is the one which masks the faulty CAM part and prevents errors from propagating to the subsequent circuits. The coding technique checks the one-to-one correspondence between the data in the CAM and those in SRAM by using the SEC-DED code with byte error detection capability, i.e., SEC-DED-SbED code, and at the same time it detects and corrects errors in the data stored in SRAM. The simplified 1-out-of-n check processes association errors. The graceful degradation gives a flag in the faulty memory section and prevents it from being used. The methods proposed in this paper are evaluated from area augmentation and error detection capability perspectives. The results show that the fault-tolerant TLB with 32 virtual address bits, 32 physical address bits and 128 entries gives single fault detection probability of nearly 99 percent with 28 percent area increase.

关键词： CAM TLB DISTANCE SEPARABLE TECHNIQUE CODING TECHNIQUE SIMPLIFIED 1-OUT-OF-N CHECK GRACEFUL DEGRADATION

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Adaptive Hybrid control of Manipulators On Uncertain Flexible Objects

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Advanced Robotics 1995年第5期10卷 469-485页

作者： Wu, Jianqing Luo, Zhiwei Yamakita, Masaki Ito, Koji Department of information and Computer Sciences Toyohashi University of Technology Tempaku-cho Toyohashi 441 Japan Bio-Mimetic Control Research Center The Institute of Physical and Chemical Research (RIKEN) Atsuta-ku Nagoya 456 8-31 Rokuban 3-chome Japan Faculty of Engineering Tokyo Institute of Technology Meguro-ku Tokyo 152 2-12-1 Oh-Okavama Japan Interdisciplinary Graduate School of Science and Engineering Tokyo Institute of Technology Yokohama 226 4295. Nagatsuta Midori-ku Japan

This paper presents an adaptive hybrid control approach for a robot manipulator to interact with its flexible object. Because of its flexibility, the object dynamics influence the robot’s control system, and since it is usually a distributed parameter system, the object dynamics as seen from the robot change when the robot moves. The problem becomes further complicated such that it is difficult to decompose the robot’s position and contact force control loops. In this paper, we approximate the object’s distributed parameter model into a lumped ‘position state-varying’ model. Then, by using the well-known nonlinear feedback compensation, we decompose the robot’s control space into a position control subspace and object torque control subspace. We design the optimal state feedback for the position control loop and control the robot’s contact force through controlling the resultant torque of the object. We use the model- reference simple adaptive control strategy to control the torque control loop. We also study the problem on how to select a reasonable reference model for this control loop. Experiments of a PUMA robot interacting with an aluminum beam show the effectiveness of our approach. © 1996, VSP and Robotics Society of Japan.

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Risk-sensitive/integral control for systems with point process observations

Risk-sensitive/integral control for systems with point proce...

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IEEE Conference on Decision and control

This paper deals with necessary conditions for integral and exponential-of-integral cost functions, when the signal is a controlled diffusion process, and the observations consist of continuous and discontinuous processes. These problems are reformulated as infinite dimensional stochastic problems having full information, with state of the Zakai equation for the integral cost, and the information state for the exponential-of-integral cost. The approach is the one considered by Bensoussan (1992) for the case of integral cost with continuous observations.< >

关键词： control systems Stochastic processes Cost function Process control Diffusion processes Integral equations Indium tin oxide Electric variables measurement control engineering Educational institutions

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