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Author: Willow Primack
Publisher:
ISBN:
Category :
Languages : en
Pages : 67
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Book Description
As Amazon.com has grown, the company has invested in warehouse systems similar to those traditionally found in manufacturing. These systems are a complex and interconnected set of manned work processing stations linked together by conveyance. This thesis examines one such system, arranged as a set of parallel single piece workflow lines joined by a central computerized sorter that route work between lines, and examines the effect of sorter algorithms and line capacity on production output. Work studies, interviews, and a practical experiment suggest a deterioration in the feedback provided to the central sorter for work routing. A Monte Carlo simulation model of the system further supports this hypothesis, suggesting that system throughput is 11.7% lower than a system that perfectly routes work to line in a pull fashion. While perfect routing is not practically feasible, the thesis then explores two routing heuristics designed around starvation response and dynamic capacity analysis, which simulation suggest may yield a 6.73% increase in throughput. In doing so, the thesis provides a case study on process improvement using simulation to characterize a complicated mechanical production system that is otherwise analytically intractable.
Author: Willow Primack
Publisher:
ISBN:
Category :
Languages : en
Pages : 67
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Book Description
As Amazon.com has grown, the company has invested in warehouse systems similar to those traditionally found in manufacturing. These systems are a complex and interconnected set of manned work processing stations linked together by conveyance. This thesis examines one such system, arranged as a set of parallel single piece workflow lines joined by a central computerized sorter that route work between lines, and examines the effect of sorter algorithms and line capacity on production output. Work studies, interviews, and a practical experiment suggest a deterioration in the feedback provided to the central sorter for work routing. A Monte Carlo simulation model of the system further supports this hypothesis, suggesting that system throughput is 11.7% lower than a system that perfectly routes work to line in a pull fashion. While perfect routing is not practically feasible, the thesis then explores two routing heuristics designed around starvation response and dynamic capacity analysis, which simulation suggest may yield a 6.73% increase in throughput. In doing so, the thesis provides a case study on process improvement using simulation to characterize a complicated mechanical production system that is otherwise analytically intractable.
Author: Sergio Augusto Caporali Filho
Publisher:
ISBN:
Category : Industrial engineering
Languages : en
Pages : 452
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Book Description
Author: Julie C. Christopher
Publisher:
ISBN:
Category : Materials handling
Languages : en
Pages : 250
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Book Description
"A critical aspect of semiconductor manufacturing is the design and analysis of material handling and production control policies to optimize fab performance. As wafer sizes have increased, semiconductor fabs have moved toward the use of automated material handling systems (AMHS). However, the behavior of AMHS and the effects of AMHS on fab productivity are not well understood. The first aspect of the research involves the development of a design and analysis methodology for evaluating the throughput capacity of AMHS. A set of simulation experiments is used to evaluate the throughput capacity of an AMHS and the effects on fab performance measures. This research utilizes two simulations of SEMATECH fab data of actual production fabs. The AMHS vehicle utilization point at which fab performance is degraded is studied. Results show a large increase in lot cycle time at a vehicle utilization of 75%, far below the maximum 100% utilization. These results stress the importance of using a performance indicator that takes into account the performance of the entire fab and not only the AMHS. The second aspect of this research involves the study of AMHS and tool dispatching rules. The hypothesis of this study is that fab performance is affected by both the choice of AMHS and tool dispatching rules as well as their interaction. A full factorial design experiment is conducted to test this hypothesis. Results show that for each fab tested the vehicle rules, machine rules, and their interactions are significant using an ANOVA test on average lot cycle time and other fab performance measures. Additional analyses are conducted to identify robust combinations of AMHS and tool dispatching rules among those tested. The overall resutlts of this study indicate that AMHS and tool dispatching rules affect fab performance and must be considered together when trying to optimize fab performance"--Abstract.
Author: Chee Keen Lau
Publisher:
ISBN:
Category :
Languages : en
Pages : 70
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Book Description
Author: W. Dale Compton
Publisher: National Academies Press
ISBN: 0309038448
Category : Technology & Engineering
Languages : en
Pages : 248
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Book Description
Design and Analysis of Integrated Manufacturing Systems is a fresh look at manufacturing from a systems point of view. This collection of papers from a symposium sponsored by the National Academy of Engineering explores the need for new technologies, the more effective use of new tools of analysis, and the improved integration of all elements of manufacturing operations, including machines, information, and humans. It is one of the few volumes to include detailed proposals for research that match the needs of industry.
Author: Gaston Lefranc
Publisher: Elsevier
ISBN: 9780080444840
Category : Business & Economics
Languages : en
Pages : 440
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Book Description
Author: J.M. Tanchoco
Publisher: Springer Science & Business Media
ISBN: 1461524989
Category : Technology & Engineering
Languages : en
Pages : 405
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Book Description
This book contains a collection of contributions related to the design and control of material flow systems in manufacturing. Material flow systems in manufacturing covers a broad spectrum of topics directly affecting issues related to facilities design, material handling and production planning and control. In selecting the papers to include in this book, the scope was limited to the design and operational control aspects related to the physical move ment of parts, tools, containers and material handling devices. Recent develop ments in this area naturally led to concentration on flow systems involving cellular manufacturing, and automated transport equipment such as automated guided vehicles. However, the concepts discussed have general applicability to a wide range of manufacturing flow problems. The book is organized in five major sections: 1. design integration and justification; 2. cell design and material handling considerations; 3. alternative material flow paths; 4. operational control problems; and 5. tooling requirements and transport equipment.
Author: Maznah Iliyas Ahmad
Publisher:
ISBN:
Category :
Languages : en
Pages : 262
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Book Description
Material handling is one of the production functions that have been the focus of attention for many manufacturing industries especially discrete parts manufacturing. Generally, the design of material handling system can be divided into four phases namely; conceptual design, detailed design, launching and fully operational. The focus of this research is on the conceptual design phase. Since there are hundreds of equipment types and procedures to choose from, the selection activities are usually complex and difficult. Therefore, quick and appropriate material handling selection is important in a production system, since it can increase productivity, flexibility of the manufacturing time and it also reduces cost. Hence, development of a decision support system to aid in the selection of the material handling equipment is a significant contribution in manufacturing operations. In this research work, the selection system was developed using Kappa-PC expert system shell. It uses forward chaining for inferencing. In the forward reasoning stage, the developed system attempts to deduce a material handling equipment type recommendation based on user specified requirements. The selections of the material handling equipment are based on the move attributes and characteristics of material to be handled, operation requirement and area restriction. The recommendation from the knowledge-based system is refined through application of simulation modeling techniques. The simulation was carried out using Arena 9.0 software package. The material handling selection system assist design engineers in selecting the most suitable and appropriate material handling equipment type for the task being considered. The advantages of the developed system are; it considers both selection and configuration analysis, it can be immediately implemented in factory operations; it is modular and user friendly. The system was successfully validated through a case study. The case study was carried out on Sharp Manufacturing Corporation Sdn. Bhd., in Malaysia. Through the case study, a total of 5.20s of the transfer time and RM 9.00 per cycle of the transportation cost of the current Sharp Manufacturing System will be reduced. This result in 72.22 and 75.00 percent of improvement on the transfer time and transportation cost respectively. By the reduction and improvement on the transfer time and transportation cost, the efficiency of the material flow and productivity of the Sharp Manufacturing system will increase and the production cost will reduce.
Author: Matthew P. Stephens
Publisher: Purdue University Press
ISBN: 1612495729
Category : Technology & Engineering
Languages : en
Pages : 524
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Book Description
Designed for junior- and senior-level courses in plant and facilities planning and manufacturing systems and procedures, this textbook also is suitable for graduate-level and two-year college courses. The book takes a practical, hands-on, project-oriented approach to exploring the techniques and procedures for developing an efficient facility layout. It also introduces state-of-the-art tools including computer simulation. Access to Layout-iQ workspace planning software is included for purchasers of the book. Theoretical concepts are clearly explained and then rapidly applied to a practical setting through a detailed case study at the end of the volume. The book systematically leads students through the collection, analysis, and development of information to produce a quality functional plant layout for a lean manufacturing environment. All aspects of facility design, from receiving to shipping, are covered. In the sixth edition of this successful book, numerous updates have been made, and a chapter on engineering cost estimating and analysis has been added. Also, rather than including brief case-in-point examples at the end of each chapter, a single, detailed case study is provided that better exposes students to the multiple considerations that need to be taken into account when improving efficiency in a real manufacturing facility. The textbook has enjoyed substantial international adoptions and has been translated into Spanish and Chinese.
Author: Matthew P. Stephens
Publisher: Purdue University Press
ISBN: 1557536503
Category : Business & Economics
Languages : en
Pages : 528
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Book Description
Designed for junior- and senior-level courses in Plant and Facilities Planning and Manufacturing Systems and Procedures, this textbook is also suitable for graduate-level and two-year college courses. The book takes a practical, hands-on, project-oriented approach to exploring the techniques and procedures for developing an efficient facility layout. It also introduces state-of-the-art tools including computer simulation. Access to Layout-iQ workspace planning software is included for purchasers of the book. Theoretical concepts are clearly explained and then rapidly applied to a practical setting through a detailed case study at the end of the volume. The book systematically leads students through the collection, analysis, and development of information to produce a quality functional plant layout for a lean manufacturing environment. All aspects of facility design, from receiving to shipping, are covered. In the fifth edition of this successful book, previously published by Prentice Hall, numerous updates and corrections have been made. Also, rather than including brief case-in-point examples at the end of each chapter, a single, detailed case study is provided that better exposes students to the multiple considerations that need to be taken into account when improving efficiency in a real manufacturing facility. The textbook has enjoyed substantial international adoptions and has been translated into Spanish and Chinese. This replaces the 4th Edition by Prentice Hall (ISBN# 978-0135001059).
