Detailed simulation of a real world job shop with subassembly requirements

Article Abstract:

A highly detailed model of a furniture manufacturing plant was constructed to evaluate the effects of various proposed changes and as a long term planning tool. As it turns out, this plant and model have many features of the general class of low-technology job shops with extensive subassembly: poor scheduling, bottlenecks, which are expensive to cure, and an inadequate knowledge of automation. Salient features of this study are the large size and complexity of the model and the diversity it contains. The plant seems to be typical of a low-technology job shop, and the model has the attribute of being about as realistic as can be expected of a simulation. This paper presents the results of validating (matching) the plant and the simulation. Extensive studies which quantify the scheduling priorities are then presented, and some new measures of performance are suggested and evaluated. Further studies on bottleneck removal and adding automation clearly indicate the costs and benefits to the plant. All of these studies would seem to be quite typical of such plants. (Reprinted by permission of the publisher.)

Automation, Computer aided manufacturing, Scheduling, Scientific Research, Computer-Aided Manufacturing, technical

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A Preliminary Review of Batch Sizes in a Job Shop Using a Digital Simulation Model

Article Abstract:

In order to assess various manufacturing operations strategies, a model, written in GASP IV, was developed, based upon actual data from a machine tool shop in Britain. Factors investigated were batch sizes, product mix changes, sequencing priority rules, and capacity changes. Changes in these factors were analyzed vis-a-vis cost of shop output per unit production and whether individual orders and batches met specified completion dates. Thirty 'runs' of the model were conducted. It was found that larger sanctions, such as authorizations to manufacture machine tool components, resulted in higher costs. Even with batch-splitting techniques and trying different job queue priority rules, the shop could not economically handle larger batches. Tables of experimental results and graphs depicting plant utilization, overtime hours worked, and the effects of batch splitting are presented.

Machinery, Industrial research, Manufacturing, Production control, Research and Development, CAD/CAM, Models, England, Simulation Languages, Discrete Simulation, Work-in-Process

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Large Sample Sizes for the Estimation of Multinomial Frequencies from Simulation Studies

Article Abstract:

This paper deals with the calculation of large sample sizes for which confidence intervals of given widths for k multinomial frequencies are simultaneously correct at a given significance level. It is shown that a method for determining such sample sizes yields less conservative results than those given by other methods in use. Also, a less conservative empirical bound for sample sizes is proposed for confidence intervals of the same width. (Reprinted by Permission of Publisher.)

Numerical analysis, Statistics (Data), Estimation, Statistics, Statistical Analysis, Sampling

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