Development of a Simulator for Automated Material Handling Systems PDF Download
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Languages : en
Pages :
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Author:
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Category :
Languages : en
Pages :
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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: Ronald J. Rosenthal
Publisher:
ISBN:
Category :
Languages : en
Pages : 49
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This is a report of an investigation of the validity of a conceptual automated material handling system with tool, machine, and transfer mechanism failures. The development of a modular GPSS simulation model is used to study and analyze the system. The modular design makes it a good basis for construction of more complex models of larger similar physical concepts. The larger models are easily generated through the use of macros. (Author).
Author: Timothy Scott Meinert
Publisher:
ISBN:
Category : Materials handling
Languages : en
Pages : 46
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Author: Chee Keen Lau
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Category :
Languages : en
Pages : 70
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Author: Roelof Hamberg
Publisher: Springer Science & Business Media
ISBN: 0857299689
Category : Technology & Engineering
Languages : en
Pages : 236
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Book Description
The warehouses of the future will come in a variety of forms, but with a few common ingredients. Firstly, human operational handling of items in warehouses is increasingly being replaced by automated item handling. Extended warehouse automation counteracts the scarcity of human operators and supports the quality of picking processes. Secondly, the development of models to simulate and analyse warehouse designs and their components facilitates the challenging task of developing warehouses that take into account each customer’s individual requirements and logistic processes. Automation in Warehouse Development addresses both types of automation from the innovative perspective of applied science. In particular, it describes the outcomes of the Falcon project, a joint endeavour by a consortium of industrial and academic partners. The results include a model-based approach to automate warehouse control design, analysis models for warehouse design, concepts for robotic item handling and computer vision, and autonomous transport in warehouses. Automation in Warehouse Development is targeted at both academic researchers and industrial practitioners. It provides state-of-the art research on warehouse automation and model-based warehouse design. These topics have been addressed from a systems engineering perspective by researchers from different disciplines including software, control, and mechanical engineering, with a clear focus on the industrial applications of their research.
Author: John A. White
Publisher: Springer Science & Business Media
ISBN: 3662095122
Category : Technology & Engineering
Languages : en
Pages : 338
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Book Description
Material handling and logistics have become especially important to industrialists because of the competitive advantage that results from using the right methods to provide the right amount of the right material at the right place, at the right time, in the right condition, in the right sequence, in the right orientation, and at the right cost. But, what are the right methods? The emergence of sophisticated control systems, coupled with advances in hardware design, has resulted in a wide variety oftechno logical alternatives availablefor practically any application. Yet, with the emergence of just-in-time methods and the apparent success of the firms that have relied on the use of people and" simple" rules, rather than technology, the proper role of hardware and software in material handling and logistics is open to debate. Despite all that has been accomplished to date, the design of material handling and logistics systems remains an art as well as a science. Regardless of whether it is people, conveyors, lift trucks, robots, guided vehicles, laser scanners, storage/retrieval machines, carousels, voice encoding, machine vision, automatic palletizers, or other methods that are appropriate, selecting the right methods for moving, storing, and controlling material is vital. It is important that the selection decision be made after consideration is given to the requirements for amount, material, place, time, condition, sequence, orientation, and cost.
Author: International Association of Science and Technology for Development
Publisher: Anaheim, Calif. ; Calgary : Acta Press
ISBN:
Category : Computers
Languages : en
Pages : 178
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Author: Robert J. Graves
Publisher: Springer Science & Business Media
ISBN: 3642843565
Category : Technology & Engineering
Languages : en
Pages : 569
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Book Description
The contents of this book are based on invited papers submittedfor presentation and discussion at the 1990 Material Handling Research Colloquium held in Hebron, Kentucky, June 19-21,1990. The Colloquium was sponsored and organized by the College Industry Councilfor Material Handling Education (CIC-MHE) with addi tional co-sponsorship and funding provided by numerous organizations (see ac knowledgements). The purpose of the Colloquium was to foster open discussion about the current state of material handling research at universitiesfrom across the United States and Canada. It was an opportunity to share specific research directions and accomplishments. But more importantly, it was an opportunity to discuss the implications of the basic constraints to solving industry relevant problems in the field of material handling and closely related activities; the efficacy of the approaches being taken at the present time; and the directions believed to be of most value to the industry and to advancing the knowledge and science base of the material handling engineering discipline. The sponsoring organization, the College Industry Council for Material Handling Education was founded in 1952. The council is composed of college and university educators, material handling equipment manufacturers, distributors, users and consultants, representatives of the business press plus professional staff and members of other organizations concerned with material handling education.
Author: Willow Primack
Publisher:
ISBN:
Category :
Languages : en
Pages : 67
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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.
