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Development of selective laser sintering for titanium alloy powder -3rd report

Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy 2008年第10期55卷 738-742页

作者： Miura, Hideshi Osada, Toshiko Ishibashi, Hideki Okawachi, Kenta Uemura, Makoto Fujita, Makoto Arimoto, Nobuhiro Dept. Mechanical Engineering Kyushu University 744 Motooka Nishi-ku Fukuoka 819-0395 Japan Dept. Intelligent Machinery and Systems Graduate School of Kyushu University 744 Motooka Nishi-ku Fukuoka 819-0395 Japan Kumamoto Industrial Research Institute 3-11-38 Higashi-machi Kumamoto 862-0901 Japan OSAKA Titanium Technologies Co. Ltd. 1 Higashihama-cho Amagasaki 660-8533 Japan

Selective laser sintering (SLS) is one of the promising processes for rapid production of complex shaped parts. This paper investigates the characteristics of multi-layered compacts made by selective laser sintering using Ti-6Al-4V, Ti-6Al-7Nb powders toward fabrication of porous bone substitutes. The relative density and tensile strength were improved by optimizing the laser forming parameters. As a result, the maximum tensile strength was 550 MPa, 580 MPa for Ti-6Al-4V and Ti-6Al-7Nb compacts, respectively. In addition, although the linear laser irradiated section was not continuous due to the surface tension, it was possible to form the linear section by first low laser power irradiation (presintering) followed by second high laser power irradiation. Finally, density and compressive strength of the honey comb structure via this process were approximately similar to those of human bones.

关键词： Aluminum alloys

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Fab-wide preventive maintenance task planning and scheduling in semiconductor manufacturing

Fab-wide preventive maintenance task planning and scheduling...

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IIE Annual Conference and Expo 2007 - industrial engineering's Critical Role in a Flat World

作者： Kutanoglu, Erhan Nehme, Michael Graduate Program in Operations Research and Industrial Engineering Department of Mechanical Engineering University of Texas at Austin Austin TX United States

We propose a two-stage hierarchical model for scheduling preventive maintenance tasks in semiconductor fabrication. Given a set of tasks and time windows in which those tasks must be performed, a higher level model will place each task inside a 12-hour shift, while a lower level model schedules each task within the shift given by the higher level model. We describe the higher level model, suggest a heuristic to obtain upper and lower bounds on the optimal solution, and present computational results that examine the relationship between the tightness of the bounds and the problem parameters.

关键词： Hierarchical systems

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Economic dispatch optimization using hybrid chaotic particle swarm optimizer

Economic dispatch optimization using hybrid chaotic particle...

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2007 IEEE International Conference on systems, Man, and Cybernetics, SMC 2007

作者： Dos Santos Coelho, Leandro Mariani, Viviana Coceo Industrial and Systems Engineering Graduate Program - PPGEPS Automation and Systems Laboratory Pontifical Catholic University of Paraná Imaculada Conceição 1155 80215-901 Curitiba Paraná Brazil Pontifical Catholic University of Paraná Mechanical Engineering Graduate Program PUCPR/PPGEM Imaculada Conceição 1155 80215-901 Curitiba Paraná Brazil

ISBN: (纸本)1424409918

Particle swarm optimization (PSO) is a population-based stochastic optimization technique, originally developed by Eberhart and Kennedy, inspired by simulation of a social psychological metaphor instead of the survival of the fittest individual. In PSO, the system (swarm) is initialized with a population of random solutions (particles) and searches for optima using cognitive and social factors by updating generations. PSO has been successfully applied to a wide range of applications, mainly in solving continuous nonlinear optimization problems. Based on the PSO and chaos theories, this paper discusses the use of a chaotic PSO approach hybridized with an Implicit Filtering (IF) technique to optimize performance of economic dispatch problems. The chaotic PSO with chaos sequences is the global optimizer and the IF is used to fine-tune the chaotic PSO run in sequential manner. The hybrid methodology is validated for a test system consisting of 13 thermal units whose incremental fuel cost function takes into account the valve-point loading effects. © 2007 IEEE.

关键词： Particle swarm optimization (PSO)

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Benefits of inventory pooling for service parts logistics systems

Benefits of inventory pooling for service parts logistics sy...

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IIE Annual Conference and Expo 2007 - industrial engineering's Critical Role in a Flat World

作者： Iyoob, Ilyas Mohamed Kutanoglu, Erhan Graduate Program in Operations Research and Industrial Engineering University of Texas at Austin Austin TX 78705 United States

In this paper, we assess the benefits of risk pooling in the service parts logistics systems. We formulate a special case of the Network Design Inventory Problem (NDIP) and define conditions for which complete centralization and complete decentralization are optimal. Computational results show that the range of cost parameter values within which partial decentralization is optimal is very small. As a result, in most cases the optimal solution is either close to complete decentralization or close to complete centralization. Finally, we develop an algorithm that evaluates a small set of solutions that form an efficient frontier over the rest of the feasible solutions.

关键词： Risk assessment

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Coordinating advanced process control and scheduling in semiconductor manufacturing: Insights from single-stage models

Coordinating advanced process control and scheduling in semi...

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IIE Annual Conference and Expo 2007 - industrial engineering's Critical Role in a Flat World

作者： Yiwei, Cai Kutanoglu, Erhan Hasenbein, John Joe, Qin Graduate Program in Operations Research and Industrial Engineering Department of Mechanical Engineering University of Texas at Austin Austin TX United States Department of Chemical Engineering University of Texas at Austin Austin TX United States

Scheduling in semiconductor wafer fabrication is viewed important due to its effect on both proper utilization of expensive equipment and cycle time. The complex nature of manufacturing processes used in semiconductor manufacturing makes scheduling and other activities such as process and quality control more critical and more interdependent on each other. We investigate the interdependency, interaction, and potentially needed coordination between scheduling and advanced process control decisions. As a first step, we analyze the issue using simple models (single machine settings) both analytically and computationally, and draw insights for more complex and realistic situations.

关键词： Process control

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Dynamic consideration of crowded magnetic particle behavior in magnetic field assisted finishing process

Dynamic consideration of crowded magnetic particle behavior ...

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4th International Conference on Leading Edge Manufacturing in 21st Century, LEM 2007

作者： Natsume, Masayuki Shinmura, Takeo Yamaguchi, Hitomi Mechanical Systems Department Nagoya Municipal Industrial Research Institute Japan Graduate School of Engineering Utsunomiya University Japan Faculty of Engineering Utsunomiya University Japan

Magnetic force acting on each particle based on magnetic field data is analyzed in this report, by thinking of structure of brush-like cohering magnetic particles as a machining tool of magnetic assisted finishing process. The resultant explanation is that horizontal magnetic force in centripetal direction introduces downward force to workpiece surface in upward magnetic field, and that the force transmission formation made of crowded magnetic particles generates strong pressing force when machining resistance affects the move of magnetic particles on the occasion of machining. Knowledge on difference of magnetic particle behavior, whether resistant force transmission mode occurs or not, will materialize to select hard removing or fine finishing.

关键词： Magnetic fields

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Finish machining of Inconel 718 by circular vibration planing - An alternative for ball end milling

Finish machining of Inconel 718 by circular vibration planin...

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4th International Conference on Leading Edge Manufacturing in 21st Century, LEM 2007

作者： Hettiarachchi, Nandita Moriwaki, Toshimichi Shibasaka, Toshiro Nakamoto, Keiichi Department of Mechanical and Systems Engineering Graduate School of Science and Technology Kobe University 1-1 Rokkodai Nada Kobe 657-8501 Japan Department of Industrial and Systems Engineering Setsunan University Japan Department of Mechanical Engineering Faculty of Engineering Kobe University Japan

Circular vibration milling (CVM) has been proven capable of producing better surface finishes on difficult to cut materials. However, CVM process is far slower than conventional milling process. In circular vibration planing (CVP) process, the cutting tool is clamped without rotation and fed at a speed comparable to the feed speed of conventional milling. By superimposing circular vibration motion, necessary cutting speed could be achieved keeping the feed speed at realistic values. Inconel 718 was machined by CVM, CVP and conventional milling. It was observed that CVP could reduce tool wear and hence produce better surface finishes than conventional milling.

关键词： Cutting tools

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On selecting the MIMO Generalized Orthonormal Basis Functions poles by using Particle Swarm Optimization

On selecting the MIMO Generalized Orthonormal Basis Function...

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European Control Conference (ECC)

作者： Bruno C. Reginato Gustavo H. C. Oliveira Industrial and Systems Engineering Graduate Program (PPGEPS) of the Pontifical Catholic University of Parana (PUCPR)

This paper deals with the problem of finding the pole(s) in Orthonormal Basis Functions (OBF) models. In fact, any stable system can be exactly represented by an infinite orthonormal functions series, assuming that the basis used in such representation is complete. However, in practice a truncated basis functions expansion is used. For certain basis choice and fixed number of functions, there is a pole or set of poles that minimizes the truncation error. The problem is then to find such set. Therefore, the present paper is focused on the problem of finding the basis functions poles when more than one dynamic is involved, for instance, in SISO Generalized Orthonormal Basis Functions (GOBF) models or MIMO Laguerre, Kautz and/or GOBF models. It is proposed and analyzed here the use of Particle Swarm Optimization (PSO) for such problem. Simulation results presented shows the validity of the proposed method.

关键词： Convergence Mathematical model Particle swarm optimization Approximation methods Optimization MIMO Equations

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Economic dispatch optimization using hybrid chaotic particle swarm optimizer

Economic dispatch optimization using hybrid chaotic particle...

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IEEE International Conference on systems, Man and Cybernetics

作者： Leandro dos Santos Coelho Viviana Cocco Mariani Industrial and Systems Engineering Graduate Program-PPGEPS Automation and Systems Laboratory PUCPR/PPGEPS Pontifical Catholic University of Paraná Curitiba Parana Brazil Mechanical Engineering Graduate Program PUCPR/PPGEM Pontifical Catholic University of Paraná Curitiba Parana Brazil

Particle swarm optimization (PSO) is a population-based stochastic optimization technique, originally developed by Eberhart and Kennedy, inspired by simulation of a social psychological metaphor instead of the survival of the fittest individual. In PSO, the system (swarm) is initialized with a population of random solutions (particles) and searches for optima using cognitive and social factors by updating generations. PSO has been successfully applied to a wide range of applications, mainly in solving continuous nonlinear optimization problems. Based on the PSO and chaos theories, this paper discusses the use of a chaotic PSO approach hybridized with an implicit filtering (IF) technique to optimize performance of economic dispatch problems. The chaotic PSO with chaos sequences is the global optimizer and the IF is used to fine-tune the chaotic PSO run in sequential manner. The hybrid methodology is validated for a test system consisting of 13 thermal units whose incremental fuel cost function takes into account the valve-point loading effects.

关键词： Chaos Particle swarm optimization Fuel economy Stochastic processes Psychology Social factors Filtering theory System testing Thermal loading Cost function

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Service-learning in core courses throughout a mechanical engineering curriculum

Service-learning in core courses throughout a mechanical eng...

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114th Annual ASEE Conference and Exposition, 2007

作者： Duffy, John Barrington, Linda West, Cheryl McKelliget, John Niemi, Eugene Shina, Sammy Sun, Hongwei Niezrecki, Chris Parkin, Robert Charmchi, Majid Avitabile, Peter University of Massachusetts Lowell United States Department of Mechanical and Solar Engineering Graduate Program in Solar Engineering Center for Sustainable Energy Francis College of Engineering United States Numerous Community-university Projects Department of Mechanical Engineering IEEE ASME Heat Transfer Laboratory University of Massachusetts Lowell United States Modal Analysis and Controls Laboratory University of Massachusetts Lowell United States BS MS Doctorate in Mechanical Engineering Italy SEM

Service-Learning (S-L) has been shown to be effective on a large number of cognitive and affective measures for college students. S-L is a pedagogy in which student learning objectives and real community needs are met in a credit-bearing course. In engineering the integration of S-L into any courses, much less existing core courses in a curriculum does not match the penetration in other disciplines. The mechanical engineering (ME) Department at the University of Massachusetts Lowell has incorporated S-L projects into core courses so that every student has at least one required core course every semester with a S-L project that is either a required or elective part of the course. During 2005-06 fourteen core ME courses had S-L projects, and a required engineering ethics course also had S-L in addition to four elective courses. Nine of twelve ME faculty members incorporated S-L in those courses (more recently 12 of 13), in addition to 3 faculty outside the department teaching courses for ME students. This initiative is part of a college-wide effort to have all five undergraduate programs have S-L integrated into the core curriculum (ECE, ChE, CE, and Plastics E). Courses and projects included, for examples, introduction to engineering for first year students (common to students in all five programs) who designed and built educational displays for the local national historic park, sophomore design lab with device development for student relatives or friends with disabilities, a dynamics course with safety analysis of many local playgrounds, a convective process course with the design of a water supply system for a village in a developing country, a statics course with a water tower design for another village (with the later two systems actually constructed in the villages the college has "adopted"), a machine elements course with four different S-L miniprojects, a ME laboratory course with the design of a measurement system to test local playground surface hardness, a

关键词： mechanical engineering

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