摘要:

The single period plant layout problem under uncertainty is discussed. Solution procedures for dealing with this problem, mainly the robustness approach, are recommended. The effectiveness of the robustness approach to this problem is illustrated by a numerical example.

ISSN:0020-7543    

DOI:10.1080/00207548708919855

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

摘要:

The design and examination of time-slots using a concept originally proposed by Knott (1984) is considered with respect to work-task times having a log-normal distribution. Specific equations for this distribution are developed and a computer program to simplify calculations presented. The advantage of reducing the truncation levels so far as improving the precision and reducing the number of time-slots is demonstrated. In addition to this, the weakness of a previous, widely used, design algorithm is shown. The use of analytic and simulation approaches in evaluating time-slotting scales is explored.

ISSN:0020-7543    

DOI:10.1080/00207548708919856

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

摘要:

The literature on assembly line design has focused mainly on line balancing under the assumption of standard times. In batch production, a significant percentage of the total production occurs during the learning phase. In this paper we describe how this factor should be taken into consideration in selecting an assembly line design that meets output requirements while maximizing labour productivity.

ISSN:0020-7543    

DOI:10.1080/00207548708919857

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

摘要:

Many analytical and simulation models have been developed to study the behaviour of automatic transfer lines. Most of these models, however, have neglected the important phenomenon of scrapping of workpieces. In this paper we study the effect of this phenomenon on the performance of automatic transfer lines.

ISSN:0020-7543    

DOI:10.1080/00207548708919858

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

摘要:

A technique is presented to assist in the scheduling of projects given uncertainties (i.e. tolerances) on the durations of activities in the project. A Monte Carlo analysis is carried out in the tolerance region of activity durations and performance functions of interest such as the mean and variance of project duration and probability-weighted critical paths are evaluated. The proposed technique has a number of advantages. First, it handles the situation where activities are not independent. Second, in deducing variations in project duration, account is taken of all toleranced activities in the project. This is in contrast to existing methods which take account only of activities on the critical path. Third, the technique not only identifies critical paths, but also estimates the probability that those paths remain critical given the tolerance variations in the project. By virtue of the statistical sampling approach, computational cost of the technique is independent of project complexity. Application of the technique is a vital pre-requisite for optimal project scheduling, moreover, preliminary studies have shown that valuable sensitivity information regarding project duration and critical paths can be obtained.

ISSN:0020-7543    

DOI:10.1080/00207548708919859

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

摘要:

Recently, much research had been undertaken to develop and evaluate flexible assembly systems (FAS), a technology rated as the number one growth opportunity for robots. While robots are generally the basis of these systems, they are often difficult to justify economically and tend to increase the complexity of the workplace. A recent trend in flexible assembly has been the utilization of reprogrammable pick and place devices for specific tasks. These devices are generally non-servo controlled, pneumatically powered, ‘low technology’ robots. Although they have a limited operation sequence, they offer low investment and fast cycle times. Because of the increasing interest in low technology robots for assembly, the objective of this project was to develop and evaluate a pick and place part handling device. Physical characteristics of the prototype robot such as repeatability, operating pressure, and stroke length were tested to determine performance trends that developed.

ISSN:0020-7543    

DOI:10.1080/00207548708919860

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

摘要:

In this paper two classes of clustering models are considered: (1) matrix, and (2) integer programming. The relationship between the matrix model, thep-median model and the classical group technology concept is discussed. A generalized group technology concept, based on generation for one part of a number of different process plans, is proposed. This new concept improves the quality of process (part) families and machine cells. A corresponding integer programming model is formulated. The models discussed are illustrated with numerical examples.

ISSN:0020-7543    

DOI:10.1080/00207548708919861

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

摘要:

In this research a method of using principal components is developed to control a process which has many output characteristics affecting the quality of the final product. The advantage of using principal components lies in the reduction of the number of variables to be control charted, thereby minimizing the combined probability of a type I error. Expressions using multivariate regression analysis are developed to predict the input variables. Numerical examples are given to illustrate the methodology developed.

ISSN:0020-7543    

DOI:10.1080/00207548708919862

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

摘要:

The chisel edge effect on conventional drills gives rise to high thrust forces, manufacturers are therefore continually seeking ways to eliminate or reduce this effect. A particular configuration proposed by a drill manufacturer to eliminate the chisel edge is investigated and evaluated. Further modifications on the manufacturer's configuration are put forward with the aim of eliminating the drawback of out-of-balance forces caused by the new configuration. Results are presented of experimental tests to investigate the effect of such modifications, and compare them with those obtained using a conventional drill.

ISSN:0020-7543    

DOI:10.1080/00207548708919863

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

摘要:

A simulation model of a manual flow line system has been developed. The data generated by simulation, assuming normally distributed operation times, has been employed to obtain an empirical model for the efficiency of a balanced line. The model has also been found to be valid for a wide range of parameters, when the operation times follow erlangian distribution. In addition, this paper includes a simple cost analysis for optimizing the size of the in-process buffers.

ISSN:0020-7543    

DOI:10.1080/00207548708919864

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor