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2003 European Control Conference, ECC 2003

作者： Hong, W.K. Choi, J.J. Kim, J.S. Yi, J.J. Research Institute of Industrial Science and Technology Korea Republic of Department of Mechanical and Intelligent Systems Engineering Graduate School Pusan National University Busan Korea Republic of School of Mechanical Engineering RIMT Pusan National University Busan Korea Republic of

ISBN: (纸本)9783952417379

In order to improve the flatness of hot rolled strip in hot strip finishing mills, a novel segmented looper system is developed, which called the Flatness Sensing Inter-stand Looper (FlatSIL) system. The FlatSIL system measures the tension along the direction of the strip width by using segmented rolls, and the tension profile is calculated. Using the tension profile, the flatness control system of hot strip can be constructed. The new flatness control system works for the full strip length during strip rolling as far as the tension profile-measuring device and the work roll bender are on. To control the flatness of hot strip, self-tuning algorithm using the recursive least mean square method is applied to update PI gains. By the computer simulation and experiment, the performance of flatness control systems with the fixed and self-tuning PI gains is compared. © 2003 EUCA.

关键词： Least squares approximations

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Dynamic behavior of a fluid plain journal bearing with incompressible fluid considering nonlinear fluid forces

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WIT Transactions on the Built Environment 2003年 71卷 188-196页

作者： Shintani, A. Fujita, K. Yoshioka, K. Okuno, K. Anaka, H. Asaida, Y. Mechanical Systems Engineering Graduate School of Engineering Osaka Prefecture University Japan Matsushita Electric Industrial Japan

Recently, in many areas such as computers and information equipments etc., the fluid journal bearings are required to rotate at higher speed. To satisfy this requirement, the strictly stability analysis of the journal is indispensable. In this paper, we investigate the stability analysis of the dynamic behavior of the fluid plain journal bearing with incompressible fluid considering the nonlinear terms of fluid forces. The stability analysis is examined by the numerical simulations on each model of rigid rotor and flexible rotor. The stable regions are compared by nonlinear analysis with the regions by classical linear analysis. Performing nonlinear simulation analysis, it becomes clear that there is rather a stable region in which the amplitude does not increase abruptly, and this phenomenon can not only be pointed out, but also is judged to be unstable by linear stable analysis. Finally, the experiment using actual bearings is performed and compared with the numerical results. © 2004 WIT Press.

关键词： Journal bearings

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Enhancing control engineering education using a CACSD didactic environment

Enhancing control engineering education using a CACSD didact...

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IEEE International Conference on systems, Man and Cybernetics

作者： E.R. Loures M.R. Silveira M.A. Busetti Y. Arda Graduate Program in Production Systems Engineering Pontifical Catholic University of Paraná Curitiba Brazil

The classical approaches to teach the control systems present drawbacks, such as: (i) the general overview of the problem is sometimes underemphasized by the knowledge acquisition; (ii) they mainly use the academic examples that are only dealing with simple concepts and problems; (iii) laboratory experiments are either simple or under developed. Design aspects of control systems when applied to practical processes are important to improve the knowledge of the students and to motivate the utilization of modern methodologies as an emergent technology for the applications in industry. In this work, we point out some important aspects for conceiving a new educational product. We describe our experiences in creating a didactic environment for teaching and learning the control theories in engineering courses based on CACSD (computer aided control system design) and its extension to the research field of industrial problems. Two distinct proposals arise from these experiences for reducing the gap between the theoretical and practical classes, and for teaching the control systems development cycle using mathematical tools and real plants under the virtual instrumentation concept.

关键词： Control engineering education Control systems Electrical equipment industry industrial control Knowledge acquisition Laboratories Application software Educational products Control theory Design engineering

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Improvement of Board Level Reliability for μBGA Solder Joints Using Underfill

Improvement of Board Level Reliability for μBGA Solder Join...

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作者： Kim, Jong-Min Farson, Dave F. Shin, Young-Eui Department of Manufacturing Science Graduate School of Engineering Osaka University Suita 565-0871 Japan Department of Industrial Welding and Systems Engineering Ohio State University 1971 Neil Avenue Columbus OH 43210 Department of Mechanical Engineering Chung-Ang University Seoul 156-756 Korea Republic of

The underfilling μBGA as an alternative to direct chip attachment for high density packaging technologies have been developed. This paper discusses the thermomechanical and metallurgical effects of underfill material and the resulting improvement in board level reliability for underfilled μBGA assemblies. Finite element analysis (FEA) models were developed to predict the thermal fatigue life of the solder joints during thermal cycling tests for μBGA assemblies without and with underfill material. FEA predicted that the stress concentrated in the solder at the crevice between the solder ball and upper substrate was approximately 60 percent of the stress without underfill. Subsequently, the predicted fatigue life was as much as 10 times higher for the underfilled assemblies. The thermal fatigue failure of μBGA solder joints was also investigated experimentally using thermal cycle testing with subsequent solder joint analysis by scanning electron microscope (SEM) and energy dispersive X-ray (EDX). The experiments revealed that solder joint failure was caused by propagation of cracks that initiated in the solder at the upper interface between the solder ball and copper pad. The fatigue life of the underfilled assemblies was about 8 times that of the assemblies without underfill. The results showed that the underfill material can play an important role in improving board level reliability for μBGA solder joints in harsh environments.

关键词： Soldered joints

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Performance Analysis of Adaptive Genetic Algorithms with Fuzzy Logic and Heuristics

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Fuzzy Optimization and Decision Making 2003年第2期2卷 161-175页

作者： Yun, Youngsu Gen, Mitsuo School of Automotive Industrial & Mechanical Engineering Daegu University Kyungbook South Korea Graduate School of Information Production & Systems Waseda University Kitakyushu Japan

In this paper, we propose some genetic algorithms with adaptive abilities and compare with them. Crossover and mutation operators of genetic algorithms are used for constructing the adaptive abilities. All together four adaptive genetic algorithms are suggested: one uses a fuzzy logic controller improved in this paper and others employ several heuristics used in conventional studies. These algorithms can regulate the rates of crossover and mutation operators during their search process. All the algorithms are tested and analyzed in numerical examples. Finally, a best genetic algorithm is recommended.

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Lifelong learning for innovation and leadership in engineering

Lifelong learning for innovation and leadership in engineeri...

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2002 ASEE Annual Conference and Exposition: Vive L'ingenieur

作者： Keating, Donald A. Stanford, Thomas G. Dunlap, Duane D. Bennett, Ronald J. Mendelson, Mel I. Sebastian, Donald H. Tricamo, Steven J. University of South Carolina Western Carolina University St. Thomas University Loyola Marymount University New Jersey Institute of Technology Department of Mechanical Engineering University of South Carolina Department of Chemical Engineering University of South Carolina Department of Engineering Technology Western Carolina University Grad. Eng. Technol. Mgmt. Programs Dept. Undergrad. Eng. at St. Thomas Department of Mechanical Engineering Eng. Prod. Mgmt. Graduate Program LMU Los Angeles CA Department of Industrial Engineering New Jersey Institute of Technology Dept. of Manufacturing Engineering New Jersy Institute of Technology

In many ways graduate engineering education has served the U.S. well. But there is now broad recognition that it must change substantially to meet new challenges of the 21st Century. A noticeable decline in the number of domestic graduate students pursuing engineering has occurred and just under half of those who are pursuing the doctorate are foreign nationals. But the drop in Americans engaging in graduate studies in engineering is also being perceived by industry and by a growing proportion of graduate schools as a reflection of a lack of opportunity for lifelong learning and of an insufficiency of U.S. graduate education to serve the full professional spectrum of engineering. This deficiency is affecting U.S. competitiveness and the nation's long-term capacity for innovation. The ASEE-graduate Studies Division has established a National Collaborative to address the compelling issues for needed reform to improve more relevant engineering graduate education for the engineering workforce in industry as a complement to research-based graduate education. This paper describes the conceptual basis and impact of this reform and a call-for-action is submitted to promote this activity to improve U.S. competitiveness.

关键词： engineering education

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Experimental Investigation of Marangoni Effect in NH3-H2O Solution with Additive

Experimental Investigation of Marangoni Effect in NH3-H2O So...

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第一届亚洲制冷空调大会

作者： Noboru TSUSHIMA Yong Tae KANG Atsushi AKISAWA Takao KASHIWAGI ~*Department of Mechanical Systems Engineering Tokyo University of Agriculture and Technology 2-24-16 Nakamachi Koganei Tokyo 184-8588 Japan School of Mechanical and Industrial Systems Engineering Kyung Hee University Street No. 1 Hoigi-dong Dongdemun-gu Seoul Korea Graduate school of Bio-Applications and Systems Engineering Tokyo University of Agriculture and Technology Graduate school of Bio-Applications and Systems Engineering Tokyo University of Agriculture and Technology

In absorption systems, the performance of heat and mass transfer can be significantly enhanced by adding heat transfer additives to the working solution pairs. The small addition of heat transfer additives changes the magnitude of surface tension, which causes interfacial turbulence by the Marangoni effect leading to a higher heat and mass transfer performance. The surface tension of working solution has a significant effect on not only heat and mass transfer characteristics but also the flow *** this study, it was found that addition of the heat transfer additive beyond the solubility limit assisted Marangoni convection occurrence.

关键词： Marangoni convection Ammonia-water Additive

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ASAP2: an improved batch means procedure for simulation output analysis

ASAP2: an improved batch means procedure for simulation outp...

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Simulation Winter Conference

作者： N.M. Steiger E.K. Lada J.R. Wilson C. Alexopoulos D. Goldsman F. Zouaoui Maine Business School University of Maine Orono ME USA School of Industrial & Systems Engineering Georgia Institute of Technology Atlanta GA USA Graduate Program in Operations Research Department of Industrial Engineering North Carolina State University Raleigh NC USA Research Group Sabre Inc. Southlake TX USA

We introduce ASAP2, an improved variant of the batch-means algorithm ASAP for steady-state simulation output analysis. ASAP2 operates as follows: the batch size is progressively increased until the batch means pass the Shapiro-Wilk test for multivariate normality; and then ASAP2 delivers a correlation-adjusted confidence interval. The latter adjustment is based on an inverted Cornish-Fisher expansion for the classical batch means t-ratio, where the terms of the expansion are estimated via a first-order autoregressive time series model of the batch means. ASAP2 is a sequential procedure designed to deliver a confidence interval that satisfies a prespecified absolute or relative precision requirement. When used in this way, ASAP2 compares favorably to ASAP and the well-known procedures ABATCH and LBATCH with respect to close conformance to the precision requirement as well as coverage probability and mean and variance of the half-length of the final confidence interval.

关键词： Analytical models Modeling Steady-state Operations research industrial engineering systems engineering and theory Algorithm design and analysis Testing Liver Discrete event simulation

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Monitoring the navy's strategic reserve of ozone-depleting substances

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NAVAL ENGINEERS JOURNAL 2002年第4期114卷 95-104页

作者： Smith, DE Breslin, DA Toms, GS Norton, P DENNIS E. SMITH PH.D. is currently a statistical consultant for GEO-CENTERS INC. He received a B.A. in Mathematics (magna cum laude)from Wabash College and an M.S. in mathematics an M.S. in statistics and a Ph.D. in statistics from the University of Wisconsin. From November 1973 until February 1999 he was president and principal statistician at Desmatics Inc. where he participated in a number of studies involving the application of statistical methods to various technical problems in the Navy's environmental-protection and auxiliary-machinery programs. Dr. Smith was instrumental in developing the statistical procedures underlying the Navy's ODS reserve monitoring plan. DAVID A. BRESLIN P.E. is the director of technical operations for the Naval Surface Warfare Center and chairs the ASNE/SNAME Joint Committee on Environmental Engineering. He received a master of science in aerospace engineering from Virginia Tech a master of engineering administration in industrial and systems engineering from Virginia Tech and a bachelor of engineering in mechanical engineering from Stevens Institute of Technology. From 1993 to 1997 he was the program manager of the Naval Sea Systems Command's CFC and Halon Elimination Program and played a critical role in establishing the Navy's strategic reserve of ozone-depleting substances. Because of his many efforts he received a Stratospheric Ozone Protection Award in 1995 from the U.S. Environmental Protection Agency in recognition of “exceptional contributions to global environmental protection”. GREGORY S. TOMS P.E. is the CFC &Halon Elimination Program Manager for the Naval Sea Systems Command (NAVSEA). He received a master of science degree in mechanical engineering from the University of Maryland and a B.S. degree in mechanical engineering from West Virginia University. From 1984 to 1997 he was employed at the Naval Surface Warfare Center Carderock Division Annapolis Detachment (formerly David Taylor Research Center)where he worked on the development of advanced cent

The domestic production of the most powerful ozone-depleting substances (ODSs) has permanently ceased and the abundant supplies of a number of refrigerants, fire-fighting agents, and solvents, once taken for granted, are now a thing of the past. The Navy has adopted a successful strategy for addressing the threat posed by the unavailability of ODSs. That strategy includes relying on a strategic reserve of ODSs. Considering that the strategic reserve will play a critical role in sustained Fleet operations into the middle of the century, it is important to record the history of the reserve and to document lessons learned in order to educate future generations that may face similar challenges. This is the third of three papers that cover all aspects of the Navy's strategic reserve of ODSs. Breslin (1999) documented the history of the Navy's effort to size, establish, and monitor a reserve designed to support Fleet operations until the middle of the century. Breslin, Smith, and Toms (2000) addressed in detail the process used to estimate the required size of the reserve, including the survey method, statistical analyses, and sizing algorithms. This paper discusses the Navy's plan for monitoring the Navy's strategic reserves of ODSs and describes the methods used in the monitoring process. In particular it discusses the underlying assumptions and statistical techniques associated with the Navy's prediction of the expected drawdown of the reserves. A comparison of actual data, collected since the strategic reserves began operations in 1995, with the predicted reserve drawdown, is included in the paper.

关键词： Marine engineering

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A Web-enabled Virtual Disassembly Manager (web-VDM) for electronic product/process designers, disassembly line managers and operators, and our UML model and tools

A Web-enabled Virtual Disassembly Manager (web-VDM) for elec...

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IEEE International Symposium on Electronics and the Environment

作者： P.G. Ranky R.J. Caudill K. Limaye N. Alli S. ChamyVelumani A. Bhatia M. Lonkar Department of Industrial and Manufacturing Engineering New Jersey Institute of Technology Newark NJ USA NDCEE Task 228 DEER 2 Program Concurrent Technologies Corporation Largo FL USA Department of Industrial and Manufacturing Engineering MERC Multi lifecycle Engineering Research Center NJIT Newark NJ USA MERC Multi lifecycle Engineering Research Center New Jersey Institute of Technology Newark NJ USA Graduate Research Students NJIT MERC Multi lifecycle Engineering Research Center Newark NJ USA

The Web-enabled Virtual Disassembly Manager (web-VDM) for electronic product/process designers, disassembly line managers and operators project is a major MERC/NJIT R&D group effort, supported by several funding agencies, companies and institutions and their hard working staff and RAs (research assistants). The purpose of this paper is to introduce a segment of this project, by discussing object oriented, validated modeling methods and software tools, as well as a system architecture in UML (Unified Modeling Language) that enables individual, as well as e-commerce-linked, B2B (business to business) collaborative enterprises to analyze and design all critical aspects of their demanufacturing and logistics processes over the web, manage their disassembly lines and provide electronic support systems for operators. Besides an overview of our system model, this paper focuses on specific, web-enabled electronic support tools for e-commerce of harvested components and parts, as well as tools for disassembly line managers and operators. Furthermore, integrated with the above system, we demonstrate our tools, and our novel 3D part identification and electronic object/component marking method, that helps line managers to identify physical objects/components electronically and then publish these objects over the web as part of our web-VDM database.

关键词： Project management Object oriented modeling Unified modeling language Process design Product design Software tools Computer architecture Service oriented architecture Collaborative tools Collaborative software

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