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Improvement of product strength and press formability of Al-Mg-Si alloy sheets by resistance heat treatment and artificial aging

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Keikinzoku/Journal of Japan Institute of Light Metals 2006年第6期56卷 313-316页

作者： Ishiguro, Minoru Maki, Seijiro Mori, Ken-Ichiro Doctoral Program of Mechanical and Structural System Engineering Toyohashi University of Technology 1-1 Hibarigaoka Tempaku-cho Toyohashi-shi Aichi 441-8580 Department of Production Systems Engineering Toyohashi University of Technology Toyohashi-shi Aichi

A treatment consisting of resistance heat treatment and artificial aging was developed to improve the product strength and press formability of Al-Mg-Si alloy sheets having paint bake hardenability used for automobile body panels. In this treatment, the sheets are re-solution heat-treated by resistance heating and water quenching just before the press forming. The formed sheets are artificially aged just after the press forming to increase the product strength. In the experiment, Al-0.60%Si-0.74%Mg (A6061) alloy sheets were chosen. The solution heat treatment of the sheets was sufficiently accomplished by the rapid resistance heat treatment, and the press formability of the sheets was improved. The hardness of formed products is increased by the artificial aging and paint bake hardening. It was found that the present heat treatment is effective in improving the product strength and press formability of the Al-Mg-Si alloy sheets having the paint bake hardenability.

关键词： Aluminum alloys

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Systems engineering as a foundation of engineering management education

Systems engineering as a foundation of engineering managemen...

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113th Annual ASEE Conference and Exposition, 2006

作者： Trainor, Timothy Hoyle, Heidi U.S. Military Academy United States Engineering Management Program United States Military Academy United States Production Operations Management for the Engineering Management Program United States Military Academy United States

The Department of Systems engineering at the United States Military Academy (USMA) offers an undergraduate major in engineering Management. This multi-disciplinary major is accredited by the Accreditation Board of engineering and Technology (ABET) of the engineering Accreditation Commission (EAC). All engineering Management majors at USMA start their studies with an introductory course in engineering Design and Systems Management. In this course, students are introduced to the Systems engineering and Management Process (SEMP), which is the foundational problem solving approach used and reinforced throughout the curriculum. This paper describes the engineering Management curriculum at the USMA, and shows how the sequencing of courses enhances students' abilities as problem solvers using the SEMP. Students take courses in Systems engineering, engineering Management, another engineering discipline of their choosing, Financial Management and Personnel Management. The program of study culminates with students solving a real-world problem following the framework of the SEMP for a Department of Defense or industry client as part of a year-long Capstone Design course. Students work in small teams of four under the direction of a Ph.D. faculty member in applying the concepts learned throughout the curriculum. © American Society for engineering Education, 2006.

关键词： Systems engineering

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The use of andon in high rise building

The use of andon in high rise building

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14th Annual Conference of the International Group for Lean Construction, IGLC-14

作者： Kemmer, Sérgio L. Saraiva, Martina A. Heineck, Luiz F.M. Pacheco, Ana Valéria L. De Novaes, Marcos V. Mourão, Carlos A.M.A. Moreira, Luiz C.R. Civil Engineering Pos-Graduate Program Department of Civil Engineering Federal University of Santa Catarina Brazil C. Rolim Engineering Ltd. Fortaleza Ceará Brazil Department of Production Engineering Federal University of Santa Catarina Brazil

The Andon device is traditionally used in the manufacturing industry. This visual management tool shows the status of operations in an area and signalizes the occurrence of abnormalities. This research work takes the view that its application is connected to lean construction concepts, as its main function is to identify problems within the production line. It becomes possible to determine the origin of the production disturbances during the building process and not only at the end of it, in a way that the required measures can be taken to avoid the repetition of such problems. It is noticed also that the use of Andon improves the continuous flow of the activities and avoids rework. Moreover it provides operative crews and production managers the opportunity of learning. The application of this managerial tool has gained adepts in construction companies in the Brazilian northeast. The objective of this article is to show the steps for the application of this tool within the building construction environment. This work was developed through a case study in a multi-storey building construction and it encompasses hardware installation (both at the work place and management office), development of control charts, and the production problems analyzes. This study is concluded with the presentation of the results acquired with the use of this managerial tool. The number of work stoppages was reduced significantly, communication was greatly enhanced and transparency was enacted as production problems were readily reported, discussed and analysed.

关键词： Construction industry

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Chaotic differential evolution applied to electromagnetics optimization

Chaotic differential evolution applied to electromagnetics o...

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12th Biennial IEEE Conference on Electromagnetic Field Computation, CEFC 2006

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

ISBN: (纸本)1424403200

This work presents a new global optimization algorithm based on differential evolution (DE) method and DE combined with chaotic sequences (DEC) given by logistic map. In this paper, the optimal shape design of Loney's solenoids benchmark problem is carried out by DE and DEC algorithms. The results of DE and DEC approaches are also investigated and their performance compared with those reported in the literature. © 2006 IEEE.

关键词： Chaos theory

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Optimizing downhole safety valve test scheduling using a multiobjective genetic algorithm

Optimizing downhole safety valve test scheduling using a mul...

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8th International Conference on Probabilistic Safety Assessment and Management, PSAM 2006

作者： De Almada Garcia, Pauli Adriano Jancito, Carlos Magno Couto De Lima, Beatriz De Souza Leite Pires Droguett, Enrique López Nuclear Engineering Program Petrobras-CENPES Federal University of Rio de Janeio Avenida Hum Quadra 7 Rio de Janeiro RJ Brazil Civil Engineering Program Centro de Tecnologia Federal University of Rio de Janeiro Rio de Janeiro RJ Brazil Production Engineering Program Centro de Tecnologia E Geociências Federal University of Pernambuco Recife PE Brazil

ISBN: (纸本)0791802442

Over the past two decades the oil and gas industry has paid attention to the need of achieving reliability in well design. Reliability issues were addressed with little or no additional effort above and beyond standard design and quality management practice. However, as the focus of the business shifts to higher risk deepwater projects, reliability and risk management have taken center stage. As the consequences of failure increase it becomes increasingly important to invest in reliability analysis, testing and failure prevention efforts. Some of the critical issues that need to be taken into account by project teams involved in the design of reliable subsea systems concern the test policy of the system and its impact on costs and benefits. Downhole Safety Valve (DHSV) is a safety system associated with well constructions in field development (Jacinto [1]). With the experience gathered by Petrobras, research efforts have been carried to estimate optimum periodic test of DHSV components in order to assure safety standards and, at same time, to reduce the annualized associated cost. In this paper, a simple multiobjective genetic algorithm (MOGA) approach to DHSV test-scheduling optimization is presented, and an example of application is carried out to demonstrate the usefulness of the proposed approach. The results obtained with the proposed approach show that the genetic algorithm optimization approach is adequate to deal with that kind of problem. Gander. © 2006 by ASME.

关键词： Scheduling

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A multivariable coupling design for variable structure control using particle swarm optimization

A multivariable coupling design for variable structure contr...

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2006 ASME International Mechanical engineering Congress and Exposition, IMECE2006

作者： Dos Santos Coelho, Leandro Mariani, Viviana Cocco Pontifical Catholic University of Parana Production and Systems Engineering Graduate Program PPGEPS / CCET / PUCPR Imaculada Conceicao 1155 80215-901 Curitiba Parana Brazil Pontifical Catholic University of Parana Mechanical Engineering Graduate Program PPGEM / CCET/ PUCPR Imaculada Conceicao 1155 80215-901 Curitiba Parana Brazil

ISBN: (纸本)0791837904

This paper presents a new discrete-time sliding-mode control design for multiple-input multi-output (MIMO) systems with tuning parameters by particle swarm optimization (PSO). PSO is a kind of evolutionary algorithm based on a population of individuals and motivated by the simulation of social behavior instead of the survival of the fittest individual. Several control algorithms are presented, two decoupling design and six new approaches of the coupling design of sliding-mode control without the necessity of calculate the process interactor matrix. SMC needs a design tool for parameter configuration and efficient practically to deal with multivariable processes. Simulations are carried out using both decoupling and coupling discrete-time SMC designs. Results shown that the new proposed approach for designing the discrete-time coupling SMC is a powerful tool and it performs better than the decoupling design, usually utilized in MIMO process. The simulations are assessed on a robotic manipulator of two degree-of-freedom (2-DOF), that constitute a MIMO nonlinear coupling dynamic system, with treatment of payload mass and link length variations. Simulation results show that the application of this control strategy effectively improve the trajectory tracking precision of position and velocity variables. Copyright © 2006 by ASME.

关键词： Sliding mode control

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Mechanical design using quantum-behaved particle swarm optimizer with exponential mutation operator

Mechanical design using quantum-behaved particle swarm optim...

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2006 ASME International Mechanical engineering Congress and Exposition, IMECE2006

作者： Dos Santos Coelho, Leandro Marian, Viviana Cocco Production and Systems Engineering Graduate Program PPGEPS / CCET / PUCPR Pontifical Catholic University of Parana Imaculada Conceicao 1155 80215-901 Curitiba Parana Brazil Mechanical Engineering Graduate Program PPGEM / CCET/ PUCPR Pontifical Catholic University of Parana Imaculada Conceicao 1155 80215-901 Curitiba Parana Brazil

ISBN: (纸本)0791837904

Particle swarm optimization (PSO) is a population-based swarm intelligence algorithm that shares many similarities with evolutionary computation techniques. However, the PSO is driven by the simulation of a social psychological metaphor motivated by collective behaviours of bird and other social organisms instead of the survival of the fittest individual. Inspired by the classical PSO method and quantum mechanics theories, this work presents new Quantum-behaved PSO (QPSO) approaches using mutation operator with exponential probability distribution. The simulation results demonstrate good performance of the QPSO in solving a well-studied continuous optimization problem of mechanical engineering design. Copyright © 2006 by ASME.

关键词： Quantum theory

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Prototyping contributions for production management in construction

Prototyping contributions for production management in const...

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14th Annual Conference of the International Group for Lean Construction, IGLC-14

作者： Saffaro, Fernanda A. Trescastro, Marcel G. Rodrigues, Alana A. Schramm, Fábio K. Formoso, Carlos T. Heineck, Luiz F. Civil Engineering Department State University of Londrina Brazil Postgraduate Program in Civil Engineering Federal University of Santa Catarina Brazil Building Innovation Research Unit - NORIE Federal University of Rio Grande Do sul Brazil Federal University of Pelotas Federal University of Santa Catarina Brazil Postgraduate Program in Production Engineering Federal University of Santa Catarina Brazil

The uncertain nature of construction requires the use of tools that generate useful information and support decision making in each phase of the product development process (PDP). Experimentation techniques have been adopted by other industrial sectors with the aim of supporting product development, especially due to the existing uncertainty and risk. However, those techniques have been poorly used in construction, especially in the study of production processes at building sites. This paper describes three studies that were carried out in construction companies with the aim of investigating the role of two experimentation techniques, FRS and on-line learning, and also the requirements for their implementation. The results suggest that these techniques can be used to understand work methods and to establish standard operation elements. The production constraints did not allow the standard work to be fully adopted and interrupted the continuity of the cycle observation - reflection - action that could create in-depth knowledge on work methods. The paper discusses the requirements for establishing an appropriate environment in order to increase the prototyping contributions for creating an in-depth knowledge on work-methods.

关键词： Product development

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Discrete variable structure control based on optimization by cultural differential evolution approach

Discrete variable structure control based on optimization by...

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2006 ASME International Mechanical engineering Congress and Exposition, IMECE2006

作者： Dos Santos Coelho, Leandro Mariani, Viviana Cocco Pontifical Catholic University of Parana Production and Systems Engineering Graduate Program PPGEPS / CCET/ PUCPR Imaculada Conceicao 1155 80215-901 Curitiba Parana Brazil Pontifical Catholic University of Parana Mechanical Engineering Graduate Program PPGEM / CCET/ PUCPR Imaculada Conceicao 1155 80215-901 Curitiba Parana Brazil

ISBN: (纸本)0791837904

Advanced conceptions to design industrial control systems are, in general, dependent of mathematical models of the controlled process. Also, the task of the controllers is to achieve an optimum performance when facing with various types of disturbances that are, sometimes, unknown in practical applications. An advanced methodology for control design is the variable structure control (VSC) with sliding mode. This paper considers the non-linear control of industrial processes based on self-tuning discrete VSC technique. A novel and systematic VSC design methodology is proposed, which integrates an estimator based on recursive least square algorithm, a discrete quasi-sliding surface and a optimization method. Contrary to the trial and error selection of the variable structure feedback gains reported in the literature, the selection in present work is done using differential evolution (DE) optimization, an evolutionary computation technique, with a new operator based on normative knowledge of cultural algorithms. The proposed design has been applied to a control valve described by a non-linear Wiener model. Numerical simulation results reveal that the new DE approach is applicable and promising for the VSC design. Copyright © 2006 by ASME.

关键词： Optimal control systems

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Use of cultural particle swarm optimization for Loney's Solenoids design

Use of cultural particle swarm optimization for Loney's Sole...

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12th Biennial IEEE Conference on Electromagnetic Field Computation, CEFC 2006

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

ISBN: (纸本)1424403200

This work presents the use of particle swarm optimization (PSO) techniques with the particles' population space based on normative knowledge of cultural algorithms (CA). In this work, the optimal shape design of Loney's solenoids benchmark problem is carried out by PSO, PSO-CA, Gaussian PSO and Gaussian PSO-CA approaches. ©2006 IEEE.

关键词： Solenoids

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