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IEEE Conference on Decision and control

作者： J. Wood E. Rogers D.H. Owens ISIS Group Department Elect. and Computer Science University of Southampton Southampton UK Centre for Systems and Control Engineering School of Engineering University of Exeter UK

The property of external controllability has been well studied for 1D and 2D systems. We provide a nontrivial generalization of earlier work to the nD case. We also provide a simple algebraic characterization of contr... 详细信息

关键词： Neodymium Polynomials control systems controllability Algebra Intersymbol interference Kernel Equations

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Random Benchmark Circuits with controlled Attributes 97

Random Benchmark Circuits with Controlled Attributes

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Proceedings of the 1997 European conference on Design and Test

作者： Kazuo Iwama Sunao Sawada Kensuke Hino Hiroyuki Kurokawa Dept of Computer Science and Communication Engineering Kyushu University Japan Industria1 Instrumentation & Control Systems Department TOSHIBA Corporation Japan Research & Development JUSTSYSTEM Corporation Japan

ISBN: (纸本)9780818677861

Two major improvements, controlled fan-in and automated initial-circuit production, were made over the random generator of benchmark circuits presented at DAC'94. This is an important progress towards our goal of random benchmarking: more general and secure testing, increasing the naturality of random circuits by controlling their attributes, and obtaining test results by which the difference of performances under evaluation can be made clear.

关键词： automated initial-circuit production controlled fan-in random generator controlled attributes logic testing testing random benchmark circuits

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Emission and drivability tradeoffs in a variable cam timing SI engine with electronic throttle

Emission and drivability tradeoffs in a variable cam timing ...

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American control Conference (ACC)

作者： S.C. Hsieh A.G. Stefanopoulou J.S. Freudenberg K.R. Butts Control Systems Laboratory Department of Electrical Engineering and Computer Science University of Michigan Ann Arbor MI USA Scientific Research Laboratory Ford Motor Company Limited Dearborn MI USA

Tradeoffs between low feedgas emissions and smooth brake torque are discussed in the context of an engine equipped with variable camshaft timing (VCT). The use of VCT lowers the generation of feedgas emissions but adversely affects the torque response. However, with the addition of an electronic throttle and knowledge of online torque, the tradeoffs between emissions and drivability in the VCT engine can be lessened; conventional (nonVCT) engine torque response can be achieved while simultaneously preserving most of the emissions benefits gained by using VCT.

关键词： computer aided manufacturing CADCAM Timing Engines Fuel economy Exhaust systems Actuators Torque control Laboratories Couplings

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Multilevel simulation of force XXI fire support operations

Multilevel simulation of force XXI fire support operations

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IEEE International Conference on systems, Man and Cybernetics

作者： J.A. Hamilton E.J. Sobiesk J.C. Deal Department of Electrical Engineering & Computer Science United States Military Academy West Point NY USA Command Control Communications Computers C4 Modernization Office of the Deputy for Information Systems Washington D.C. DC USA

Rapid advances in technology have greatly enhanced capabilities to acquire and attack targets. We argue that future fire support organizations will have to rapidly expand and collapse to support the increased tempo of 21st century warfare. Expert systems can be used in many places and may, at times, replace some personnel at some levels of the fire support hierarchy. New technology, an uncertain post-Cold War world and a declining force structure have made simulation a critical means for discovering and developing new doctrine. Military fire support channels are hierarchical, paralleling the maneuver units they support. In combat, these command levels operate simultaneously with varying levels of dependence and interaction. A multilevel simulation strategy is necessary to integrate different fire support echelons into the same simulation. This paper discusses how multilevel simulation can support the development of both Joint Vision 2010 and Force XXI fire support doctrine, and how expert systems may be used to facilitate the dynamic expansion and collapse of fire support organizations.

关键词： Fires Weapons Military computing Information systems Expert systems Computational modeling computer science Military communication Communication system control control systems

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computer Aided control systems Design for Hydraulic Drives

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IFAC Proceedings Volumes 1997年第4期30卷 359-364页

作者： B. Stein E. Vier Department of Mathematics and Computer Science (Prof. Dr. H. Kleine Büning) Knowledge-based systems University of Paderborn D-33104 Paderborn Germany. Phone: +49 (5251) 60 - 3348 Fax: +49 (5251) 60 - 3338 Department of Measurement and Control (Prof. Dr.-Ing. H. Schwarz) Faculty of Mechanical Engineering University of Duisburg D-47048 Duisburg Germany. Phone: +49 (203) 379 - 1583 Fax: +49 (203) 379 - 3027

The design of hydraulic control systems is a complex and time-consuming task that, at the moment, cannot be automated completely. Nevertheless, important design subtasks like simulation or control concept selection can be efficiently supported by a computer. Prerequisite for a successful support is a well-founded analysis of a hydraulic system's structure. The paper in hand contributes right here. It provides a systematics for analyzing a hydraulic system at different structural levels and illustrates how structural information can be used within the design process. A further central matter of this paper is the automatic extraction of structural information from a circuit diagram by means of graph-theoretical investigations.

关键词： Algorithms and Knowledge-based Software Tools for CACSD Structural Analysis of Hydraulic systems Graph Theory

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Developing a prototype concurrent design tool for composite topside structures

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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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A unified adaptive active control mechanism for noise cancellation and vibration suppression

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MECHANICAL systems AND SIGNAL PROCESSING 1996年第6期10卷 667-682页

作者： Tokhi, MO Hossain, MA Department of Automatic Control and Systems Engineering The University of Sheffield Sheffield U.K. Department of Computer Science University of Dhaka Dhaka Bangladesh

This paper presents the design and implementation of an active control mechanism for noise cancellation and vibration suppression within an adaptive control framework. A control mechanism is designed within a feedforward control structure on the basis of optimum cancellation at an observation point. The design relations are formulated such that to allow on-line design and implementation and thus result in a self-tuning control algorithm. The algorithm is implemented on an integrated digital signal processing (DSP) and transputer system. Simulation results verifying the performance of the algorithm are presented and discussed. (C) 1996 Academic Press Limited

关键词： Adaptive control systems

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Prediction of time series by a structural learning of neural networks

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FUZZY SETS AND systems 1996年第2期82卷 167-176页

作者： Ishikawa, M Moriyama, T Department of Control Engineering and Science Faculty of Computer Science and Systems Engineering Kyushu Institute of Technology 680-4 Kawazu Iizuka Fukuoka 820 Japan

There have been numerous methods for learning and predicting time series ranging from the traditional time-series analyses to recent approaches using neural networks. A central issue common to all of them is the determination of model structure. Both mean prediction error and An Information Criterion (AIC) are useful in model selection;the model with the smallest mean prediction error or AIC is selected from among a set of models as the best one. In this way they give a solution to the problem of model selection. Due to huge search space, however, the mean prediction error or AIC alone is not powerful enough to find the best model structure from among all the candidates. In the present paper the authors propose to use both a structural learning with forgetting and the mean prediction error or AIC to find a model with better generalization ability. Jordan networks and buffer networks, popular in the modeling of time series, are examined in this paper. The structural learning with forgetting and backpropagation (BP) learning are applied to compare the learning and prediction performance of these two types of models. Simulation results demonstrate that the structural learning with forgetting has better generalization ability than BP learning both in Jordan networks and buffer networks.

关键词： neural networks model selection learning time series prediction

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Digital signal processing and parallel processing in the real-time simulation of a flexible manipulator system

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MECHANICAL systems AND SIGNAL PROCESSING 1996年第6期10卷 729-745页

作者： Tokhi, MO Hossain, MA Azad, AKM Department of Automatic Control and Systems Engineering University of Sheffield Sheffield U.K. Department of Computer Science University of Dhaka Dhaka-1000 Bangladesh

This paper presents an investigation into the utilisation of digital signal processing and parallel processing techniques for the real-time simulation of a flexible manipulator system. A finite dimensional simulation of the system is developed using a finite difference approximation to the governing dynamic equation of the manipulator. The proposed algorithm allows dynamic modification of the boundary conditions and the inclusion of a distributed actuator and sensor term in the system dynamic equation. The algorithm developed is implemented on a number of uni-processor and multi-processor, homogeneous and heterogeneous parallel architectures. The partitioning and mapping of the algorithm on the homogeneous and heterogeneous architectures is also explored. A comparison of the results of these implementations is made and discussed to establish merits of design and real-time processing requirements in the control of flexible manipulator systems. (C) 1996 Academic Press Limited

关键词： Digital signal processing

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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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