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第二届亚洲机械电子学学术会议

作者： Jacob W.F.Cheung Y.S.Hung Motion Control and Systems Laboratory Research and Development Department ASM Assembly Automation Ltd. 3/F Watson Centre 16 Kung Yip Street Kwai Chung New Territories Hong Kong. Department of Electrical and Electronic Engineering The University of Hong Kong.Pokfulam Road Hong Kong. Department of Electrical and Electronic Engineering The University of Hong Kong.Pokfulam Road Hong Kong.

A model-based robust control design approach for a novel direct-drive planar parallel manipulator aimed at high speed and high precision semiconductor packaging application is *** experimental identification approach is proposed to determine the dynamic model of the manipulator and a robust feedback controller is designed in the frequency-domain using genetic *** results demonstrate that the motion performance of the planar parallel manipulator including positioning accttracy,settling time and steady- state error is improved significantly when compared with traditional XY *** shows that the proposed planar manipulator provides a superior alternative to the traditional XY stages for high- precision motion.

关键词： Parallel manipulator mechatronics applications motion control dynamic modelling robust control

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Rolling Mill automation: Taking Advantage of Explicit (Open) Software Architecture

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Light Metal Age 2003年第11-12期61卷 6-15页

作者： Fodor, George Systems Development Department Flatness Control ABB Automation Technology Products Sweden

automation experts in the aluminum industry frequently meet the challenge of advancing production technology. This often means modifying the control software. This may include technology feasibility studies, introducing new types of sensors, or upgrading the computational platform. It is a well-known fact that these changes mean difficult installation and planning efforts. On-line mathematical models of processes, discrete logics (state machines) and the sensor gear are key elements that are modified each time a plant undertakes a new technological step. Traditionally, industry-grade automation equipment has a closed structure. Even when an IEC1131-style control program is open for inspection, most control models and optimization algorithms are hidden in the lower levels of the software, where the overall structure of the automation strategy is not visible at the level of abstraction required to understand, add, and modify models. The automation industry has recently introduced flexible model-based systems with explicit (open or documented) software architecture. They allow the combination of rich sensory equipment in production (non-laboratory) conditions together with flexible control policies. This article presents the principles and benefits of a modeling and control approach based on explicit, formal software architecture. Examples are given using the automation equipment for flatness and gauge control in cold rolling mills.

关键词： Aluminum rolling mills

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Application of a new automatic gauge control system for the tandem cold mill

Application of a new automatic gauge control system for the ...

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

作者： T. Tezuka T. Yamashita T. Sato Y. Abiko T. Kanai M. Sawada Power & Industrial Systems Research & Development Center TOSHIBA Corporation Fuchu Tokyo Japan Metal Systems Engineering Department TOSHIBA GE Automation Systems Corporation Minato Tokyo Japan Industrial Control Systems Division Toshiba IT and Control Systems Corporation Fuchu Tokyo Japan Kakogawa works Kobe Steel Company Limited Kakogawa Hyogo Japan

In July 2000, a new automatic gauge control (AGC) system was successfully installed at Kobe Steel's Kakogawa works. The new AGC system consists of two functions: multivariable AGC based on mass flow thickness and roll eccentricity control. The multivariable AGC is designed using ILQ (inverse linear quadratic) theory, a type of optimal control theory, and controls both thickness and tension. Repetitive control theory is applied to roll eccentricity control as roll eccentricity is a periodic disturbance related to the rotational angle of the rolls. The new AGC system has contributed to improved thickness accuracy and stable rolling. In this paper, details of the new AGC system are described and the application results are shown.

关键词： Automatic control control systems Milling machines Strips Thickness control Optimal control Fluctuations Steel Industrial control Weight control

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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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Function point analysis: evaluation of a software cost estimation model

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European Journal of Information systems 1991年第4期1卷 229-237页

作者： Heemstra, F. J. Kusters, R. J. Department of Industrial Engineering and Management Science University of Technology Section Management Information Systems and Automation Research Group Estimation and Control of Software Development Eindhoven The Netherlands

The merits of function point analysis are discussed. Function point analysis was chosen because it is one of the most widely used aids for software cost estimation. In the analysis we use data from a large survey of Dutch organizations, from an experiment on the effectiveness of software cost estimation models and from a field study aimed at the adjustment part of the FPA model. Conclusions show that it is indeed widely used and that it performs reasonably well as a product sizer, but that the adjustment part of the model is less useful.

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Performance analysis of automated manufacturing systems with blocking and deadlock

Performance analysis of automated manufacturing systems with...

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International Conference on Computer Integrated Manufacturing

作者： N. Viswanadham T.L. Johnson Y. Narahari Department of Computer Science and Automation Indian Institute of Science Bangalore India GE Corporate Research & Development Control Systems Laboratory Schenectady NY USA

Petri net and Markov chain models are developed for manufacturing systems with blocking and deadlock. The authors compute the probability that the system in an absorbing (deadlocked) state, the mean time to deadlock, and the throughput before deadlock, etc., which can be used to compare the performance of various prevention and avoidance strategies. A systematic method for designing locks and interlocks for deadlock avoidance using the reachability graph of the Petri net model is presented.< >

关键词： Performance analysis Manufacturing systems System recovery Throughput Machining control systems

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Robust Observer Design with Application to Fault Detection

Robust Observer Design with Application to Fault Detection

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American control Conference (ACC)

作者： N. Viswanadham K. Dean Minto Department of Computer Science and Automation Indian Institute of Science Bangalore India Control Systems Laboratory GE Corporate Research and Development Center Schenectady NY USA

A new scheme for robust estimation of the partial state of linear time-invariant multivariable systems is presented, and it is shown how this may be used for the detection of sensor faults in such systems. We consider an observer to be robust if it generates a faithful estimate of the plant state in the face of modelling uncertainty or plant perturbations. Using the Stable Factorization approach we formulate the problem of optimal robust observer design by minimizing an appropriate norm on the estimation error. A logical candidate is the 2-norm, corresponding to an H ∞ optimization problem, for which solutions are readily available. In the special case of a stable plant, the optimal fault diagnosis scheme reduces to an internal model control architecture.

关键词： Robustness Fault detection Observers State estimation MIMO Sensor systems Face detection Uncertainty Estimation error Fault diagnosis

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Fault detection and diagnosis of automated manufacturing systems

Fault detection and diagnosis of automated manufacturing sys...

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IEEE Conference on Decision and control

作者： N. Viswanadham T.L. Johnson Department of Computer Science & Automation Indian Institute of Science Bangalore India Systems Architectures Control Technology Bra General Electric Research and Development Center Schenectady NY USA

The authors develop a controller methodology for fault detection and diagnosis using Petri nets and fault trees in automated manufacturing systems. The controller has two levels. At the first level there are dedicated diagnostic systems for each of the subsystems, such as machine centers, robots, conveyers, etc. At the second level there is an intelligent controller monitoring the part flow and coordinating the local diagnostic systems and controllers. The authors assume that local controller and diagnostic systems exist for subsystem-level fault detection and diagnosis, and they present a Petri-net-based intelligent controller for system-level fault detection and diagnosis. The authors also describe fault-free-based diagnostics.< >

关键词： Fault detection Fault diagnosis Manufacturing systems control systems Automatic control Intelligent robots Machine intelligence Petri nets Fault trees Robot kinematics

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A communication network for distributed process control systems

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IFAC Proceedings Volumes 1987年第14期20卷 85-95页

作者： U. Grossniklaus H. Siebert Development Department of Systems for Automation and Control Brown Boveri & Company Dept. ESL-3 Baden Switzerland Brown Boveri Research Center Heidelberg FRG

A bus structured local area network for distributed process control systems is introduced. The general requirements for such a local area network are listed. The features of the network are introduced and the arbitration methods are discussed. Two arbitration methods in order to achieve the best use of the bandwidth of the network are implemented. On the one hand cyclic transmission of data, on the other hand event driven transmission is used. Two arbitration methods for event driven transmission are shown: a solution which uses event polling and a solution which uses collision detection and collision resolution to resolve concurrent bus requests. Both solutions are discussed. The expected performance of the solutions are shown.

关键词： control system communication multi-access-systems broadcasting adaptive polling

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MPCS - THE MANUFACTURING PROCESS-control SYSTEM

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AT&T TECHNICAL JOURNAL 1986年第4期65卷 35-45页

作者： DUNIETZ, IS HSU, JLC MCEACHERN, MT STOCKING, JH SWARTZ, MA TROMBLY, RM The authors Irwin S. Dunietz John L.C. Hsu Michael T. McEachern James H. Stocking Mark A. Swartz andRodney M. Tromblyare responsible for design and development of the Manufacturing Process Control System. Mr. Dunietz joined AT&T in 1980. He is a member of the technical staff in the Manufacturing Information Automation department at AT&T Engineering Research Center Princeton New Jersey. He received an A.B. in mathematics from Cornell University and an M.S.E. in computer science from Princeton University. Mr. Hsu who joined AT&T in 1970 is a department head in the Manufacturing Information Automation department at the Engineering Research Center. He received an M.S. in electrical engineering from the University of Missouri. Mr. McEachern joined AT&T in 1962 and is a supervisor in the 5ESS™ Line Unit Manufacturing department at AT&T Technologies in Oklahoma City Oklahoma. He is responsible for the manufacturing process control center in Oklahoma City which provides computerized support for all circuit pack manufacturing. Mr. Stocking who joined AT&T in 1975 is a supervisor in the Manufacturing Information Automation department at the Engineering Research Center. He received a B.S. in chemical engineering from Rensselaer Polytechnic Institute and a Ph.D. in chemical engineering from the University of California Berkeley. Mr. Swartz joined AT&T in 1980 and is a member of the technical staff in the Manufacturing Information Automation department at the Engineering Research Center. He received an A.B. in computer science from Cornell University and an M.S. in computer science from Rutgers—The State University. Mr. Trombly who joined AT&T in 19 78 is an assistant manager at the AT&T Merrimack Valley Works in Massachusetts. Previously he was a supervisor at the Engineering Research Center. He holds a B.S. in computers and systems engineering and an M.S.E.E. from Rensselaer Polytechnic Institute.

The central challenge of all manufacturing is making products to the right standards and delivering them at the right time. AT&T is upgrading its corporate and factory resource planning systems to improve control of day-to-day manufacturing. The Manufacturing Process control System (MPCS), developed at the AT&T Engineering Research Center (ERC), provides this support. MPCS connects the shop floor with production scheduling, accounting, product data archive, and engineering support systems.

关键词： PRODUCTION control

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