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2004 ASME Design engineering Technical Conferences and Computers and Information in engineering Conference

作者： Baysal, M.M. Roy, U. Sudarsan, R. Sriram, R.D. Lyons, K.W. Knowledge Based Eng. Laboratory Dept. of Mechanical Eng. Syracuse University Syracuse NY 13244-1240 United States Engineering Management Department George Washington University Gaithersburg MD 20899 United States Mfg. Systems Integration Division Natl. Inst. of Std. and Technology Gaithersburg MD 20899 United States Design and Process Group Mfg. Systems Integration Division Natl. Inst. of Std. and Technology Gaithersburg MD 20899 United States

In early design phases an effective information exchange among CAD (Computer Aided Design) tools depends on a standardized representation for the product data in all PLM (Product Lifecycle Management) tools. The NIST Core Product Model (CPM) and its extension are proposed to provide the required base-level product model that is open, non-proprietary, generic, extensible, independent of any one product development process and capable of capturing the full engineering context commonly shared in product development. The Open Assembly Model (OAM) Model extends CPM to provide a standard representation and exchange protocol for assembly. The assembly information model emphasizes the nature and information requirements for part features and assembly relationships. The model includes both assembly as a concept and assembly as a data structure. For the latter it uses the model data structures of ISO 10303, informally known as the Standard for the Exchange of Product model data (STEP). The objective of the paper is to show how the OAM can be used to realize seamless integration of product information, with an emphasis on assembly, throughout all phases of a product design. A gearbox design example is used to illustrate the process.

关键词： Computer aided design

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Evaluating solutions to BTX deactivation of Claus catalysts in lean feed SRUs

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Saudi Aramco Journal of Technology 2003年第FALL期 43-51页

作者： Crevier, Pierre P. Al-Haji, Mohammad N. Alami, Ismail A. Saudi Aramco Process Engineering Division SAU Saudi Arabia Saudi Aramco Process Engineering Division Proc. and Control Systems Department SAU Saudi Arabia Upstream Proc. Engineering Division

Saudi Aramco completed an in-house technical and economic evaluation of processes to address severe Claus catalyst deactivation resulting from BTX in the acid gas. Based on the evaluation, the company is proceeding with the design and planned installation of a carbon bed adsorption process on seven sulfur recovery units at two of its largest gas plants, i.e., Uthmaniyah Gas Plant and Shedgum Gas Plant. A discussion covers the design basis conditions for the acid gas at each site;several commonly used processes to address BTX deactivation that are technically and/or economically not viable in hot desert environments if the acid gas is very lean, i.e., oxygen enrichment, fuel gas co-firing, changing the upstream sour gas treating the amine, refrigerating the feed, BTX adsorption from acid gas using a regenerable molecular sieve, acid gas enrichment, fuel gas stripping, and BTX adsorption from acid gas using regenerable activated carbon beds;cost estimates;and final process selection.

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Application of a strip speed measurement system for hot strip rolling

Application of a strip speed measurement system for hot stri...

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2003 IFAC Workshop on New Technologies for Automation of the Metallurgical Industry 2003

作者： Hong, Seong-Cheol Lee, Young-Kow Rolling Technology and Process Control Research Group Technical Research Laboratories POSCO United States Electrical and Computer Engineering Division POSTECH Korea Republic of

To enhance strip thickness accuracy and to improve the mass flow of the head end part of a strip in the 7-stand finishing mill using a hot strip measurement system, this study is being performed. In this paper. the speed measurement system layout and the applications of measured strip speed incluing a neural network for predicting a forward slip and a feed forward automatic control(FF AGe) are given. Copyright © 2003 IFAC

关键词： Automation

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An Improved Human Machine Interface modernization for a Combined Cycle Power Plant 5

An Improved Human Machine Interface modernization for a Comb...

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5th IFAC Symposium on Power Plants and Power systems control 2003

作者： Rivas-Suarez, Alfonso Uribe-Blanco, Carlos E. Alvarez-Cortes, Victor Sanchez-Parra, Marino Electrical Research Institute Control Systems Division Process Supervision Department 29-2. P.D. Box 1-425 Cuernavaca Morelos62001 Mexico

In order to fulfill the Mexican Electric Utility'S (CFE) modernization demands, the Electrical Research Institute (lIE) developed at the process Supervision Department an improved Human Machine Interface (HMI) modernization for a Combined Cycle Power Plant (CCPP) to replace the old one based on VAX workstations with a microcomputer base system using personal cornputers(pC), maintaining the same functionality and integrating management capabilities as well as processing functiom currently performed by a proprietary system. The HMI modernization provided to CFE an integral solution through a single interface allowing the system to interface not only to current proprietary controllers but also to commercial controllers, PLCs or other Intelligent Electronic Device by integrating OPC technology. Data analysis is possible in the improved HMI due to a powerful database back-end engine added to the system. Integrating new technology to legacy systems in order to preserve its life span and be able to integrate modem devices represented a challenge to be resolved. This paper also describes how suitable these new technologies promises were accomplished in the IHM modernization. Improvements to the HMI also included an intuitive color-base navigation in a multi-level model. Improvements in communications involved the replacement of the current PC-based communication concentmtors with a pair of high performance servers to improve the overall system flexibility and robustness. Among the more challenging tasks was the integration of a modem commercial redundancy system to work with current proIXietary controllers. Copyright © 2003 IFAC.

关键词： Technology transfer

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An Internet-Mediated process control Laboratory

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IEEE control systems 2003年第1期23卷 11-18页

作者： Joseph, J. Department of Chemical Engineering University of South Florida Tampa FL 33620 United States Process Control Systems Laboratory Department of Chemical Engineering Washington University St. Louis MO 63130 United States

Two laboratory-scale experiments have been developed that can be executed safely over the Internet. They provide practical experience for students of process control. Remote access is within a client-server paradigm. Servers connected to the processes through the usual data acquisition hardware address issues regarding safety, security, data validation, and session management. A unique feature of the lab is the ability for the student to design, test, and verify control strategies in real time over the Internet. Necessary interlocks and cutoffs ensure safe remote operation of the units. Studies have shown that network speeds are not a significant concern for these systems due to slow process dynamics. The availability of Internet-mediated laboratory modules on an anytime/anywhere basis will enable a larger fraction of the class to get valuable laboratory experience. These experiments have also been used in an Internet-wired classroom for interactive demonstrations during lecture.

关键词： Internet process control Laboratories Water heating Educational institutions control systems Hardware Nonlinear control systems Safety Testing

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Multi-agent systems for industrial diagnostics 5

Multi-agent systems for industrial diagnostics

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5th IFAC Symposium on Fault Detection, Supervision and Safety of Technical processes, Safeprocess 2003

作者： Albert, Martin Längle, Thomas Wörn, Heinz Capobianco, Michele Brighenti, Attilio Institute for Process Control and Robotics University of Karlsruhe KarlsruheD-76128 Germany S.A.T.E Srl. Systems and Advanced Technologies Engineering S.r.l Santa Croce 664/a 30135 Germany

Industrial diagnostic systems aim at anticipating the occurrence of failures or, should failures have occurred, at detecting them and identifying their cause. Similar to a process control system, a diagnostic system is closely connected with a specific industrial application. In case of large and complex industrial systems, such intimate link translates into the need to satisfy requirements for modularity, flexibility, and adaptability. This paper introduces a multi-agent software architecture as a possible solution to better tackle the variety of problems connected with building diagnostic systems, based at the requirements connected with modem industrial applications. © 2003 International Federation of Automatic control.

关键词： Multi agent systems

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An Improved Human Machine Interface Modernization for a Combined Cycle Power Plant

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IFAC Proceedings Volumes 2003年第20期36卷 231-236页

作者： Alfonso Rivas-Suarez Carlos E. Uribe-Blanco Víctor Alvarez-Cortés Marino Sanchez-Parra Electrical Research Institute Control Systems Division - Process Supervision Department 29-2. P.O. Box 1-425. Cuernavaca Morelos 62001 Mexico

In order to fulfill the Mexican Electric Utility's (CFE) modernization demands, the Electrical Research Institute (IIE) developed at the process Super Vision Department an improved Human Machine Interface (HMI) modernization for a Combined Cycle Power Plant (CCPP) to replace the old one based on VAX workstations with a microcomputer base system using personal computers(pc), maintaining the same functionali1y and integrating management capabilities as well as processing functions currently performed by a proprietary system. The HMI modernization provided to CFE an integral solution through a single interface allowing the system tointerface not only to current proprietary controllers but also to commercial controllers, PLCs or other Intelligent Electronic Device by integrating opc technology. Data analysis is possible in the improved HMI due to a powerful database back-end engine added to the system. Integrating new technology to legacy systems in order to preserve its life span and be able to integrate modem devices represented a challenge to be resolved. This paperalsodescribes how suitable these new technologies promises were accomplished in the IHM modernization. Improvements to the HMI also included an intuitive color-base navigation in a multi-level model. Improvements in communications involved the replacement of the current PC-based communication concentrators with a pair of high performance servers to improve the overall system flexibility and robustness. Among the more challenging tasks was the integration of a modem commercial redundancy system to work with current proprietary controllers.

关键词： man/machine interface microcomputer based system distributed control technology transfer tests

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Application of a Strip Speed Measurement System for Hot Strip Rolling

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IFAC Proceedings Volumes 2003年第24期36卷 137-140页

作者： Seong-Cheol Hong Young-Kow Lee Rolling Technology & Process Control Research Group Technical Research Laboratories POSCO Tel: +82-54-220-6316 Electrical and Cumputer Engineering Division POSTECH

To enhance strip thickness accuracy and to improve the mass flow of the head end part of a strip in the 7-stand finishing mill using a hot strip measurement system, this study is being performed. In this paper, the speed measurement system layout and the applications of measured strip speed incluing a neural network for predicting a forward slip and a feed forward automatic control(FF AGC) are given.

关键词： hot rolling mill strip speed measurement system forward slip automatic gage control

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Synthesis of geometric tolerances of a gearbox using a deviation-based tolerance synthesis scheme

Synthesis of geometric tolerances of a gearbox using a devia...

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2003 ASME Design engineering Technical Conferences and Computer and Information in engineering Conference

作者： Pramanik, N. Roy, U. Sudarsan, R. Sriram, R.D. Lyons, K.W. Knowledge Based Eng. Laboratory Dept. of Mech. Engineering Syracuse University Syracuse NY 13244 United States Design and Process Group Systems Integration Division Natl. Inst. of Std. and Technology Gaithersburg MD 20899 United States

In this paper a step-by-step procedure for carrying out synthesis of geometric tolerances of a planetary gearbox using a deviation-based tolerance synthesis (TS) scheme has been presented. The TS scheme uses an optimization for minimizing total cost of manufacturing, subject to constraints for assemblability of parts and constraints for functional requirements. The TS work is carried out in several stages. First the gearbox with its nominal dimensions is converted into a model that could serve as input to the synthesis module. Cost functions and constraints equations are then generated using deviation parameters of features. The optimization is carried out using these equations in standard non-linear minimization tools (Matlab) and the optimal deviation parameters are subsequently mapped into suitable tolerance specifications or tolerance zones as per ANSI Y14.5 tolerancing standards.

关键词： Gears

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Near minimax robust control of flexible structures

Near minimax robust control of flexible structures

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American control Conference (ACC)

作者： M. Muenchhof T. Singh Department of Mechanical and Aerospace Engineering SUNY at Buffalo Buffalo NY USA Institute of Automatic Control Laboratory of Control Systems and Process Automation Darmstadt University of Technology Darmstadt Germany

This paper presents an approach to calculate prefilters that are insensitive to parameter deviations. The cost function chosen for this approach is the magnitude of the time-delay filter transfer function. By approximating the cost function with a polynomial, the effort of calculating minimax robust profiles can be reduced. The resulting control profiles yield a performance similar to the minimax robust controller. This is verified by the numerical results included in this paper.

关键词： Minimax techniques Robust control Flexible structures Filters Uncertainty Frequency Cost function Vibrations control systems Delay effects

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