Institute for Systems Research Technical Reports

Permanent URI for this collectionhttp://hdl.handle.net/1903/4376

This archive contains a collection of reports generated by the faculty and students of the Institute for Systems Research (ISR), a permanent, interdisciplinary research unit in the A. James Clark School of Engineering at the University of Maryland. ISR-based projects are conducted through partnerships with industry and government, bringing together faculty and students from multiple academic departments and colleges across the university.

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Author: search.filters.author.Jajodia, Satish K.Subject: search.filters.subject.group technology

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    Design of Manufacturing Cells with Multiple, Functionally Identical Machines
    (1990) Jajodia, Satish K.; Harhalakis, G.; ISR
    This thesis addresses the entire layout design problem of a manufacturing facility of discrete parts which includes unique as well as functionally identical machines. The problem has been addressed in two distinct stages. The first stage consists of grouping the available machines into manufacturing cells and the parts into part families. The second stage addresses the determination of proximity of cells and the proximity of machines for inter-cell and intra-cell layouts respectively. The objective in both states is to minimize the weighted traffic of parts in the system. New heuristics have been proposed for both these problems. The cell-formation heuristic is based on a bottom-up approach which minimizes the total inter-cell material flow within the system. The handling of the functionally identical machines in this formulation is novel and is based on capacity considerations, which are critical in a manufacturing company. The solution in the second stage is based on the method of Simulated Annealing. For some classical layout problems, the proposed method provided results superior to those obtained using existing layout formulations. An industrial application of the entire design methodology has also been presented.
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    Class: Computerized LAyout Solutions Using Simulated Annealing
    (1990) Minis, Ioannis; Harhalakis, George; Jajodia, Satish K.; Proth, J.M.; ISR
    A new method (Computerized LAyout Solutions using Simulated annealing - CLASS) that considers the inter-cell and intra-cell layout problems in a cellular manufacturing environment is presented. It addresses the relative placement of equidimensional manufacturing entities within a discrete solution space in an attempt to minimize the total material flow (cost) between these entities. An approach to accommodate the relative sizes of the entities is also presented. The method is based on Simulated Annealing, which has been successfully applied for the solution of combinatorial problems. A major advantage of this technique is the insensitivity of the final solution to the initial conditions. In addition, some important practical issues such as intra-cell layout of machines in pre-determined configurations (e.g. row-wise or circular arrangements), have been addressed. Several comparisons were made with some of the existing approaches for facility layout, such as CRAFT, HC63-66, etc. that yielded results of equal or better quality for each of eight classical test problems.
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    Manufacturing Cell Formation with Multiple, Functionally Identical Machines
    (1990) Minis, Ioannis; Harhalakis, George; Jajodia, Satish K.; ISR
    A comprehensive methodology for the formation of manufacturing cells in an environment consisting of unique as well as multiple, functionally identical machines is presented in this paper. The proposed method presupposes the existence of generic process plans that specify the types of machines required for the manufacture of each part, although more than one machine of the same type may be available in the shop. The production equipment is grouped into manufacturing cells and the manufactured parts are assigned to part families, based on an inter-cell traffic minimization criterion and subject to capacity constraints. Two or more functionally identical machines are included in a cell, only if necessitated by capacity considerations, or traffic minimization arguments. The method also considers both part set- up and run times for the evaluation of the capacity requirements, and uses pallet traffic as opposed to individual part traffic in the minimization criterion.