摘要:

When a reorder point system is used for initiating production orders, the production load on the machines can be treated as a random variable. One way of resolving problems associated with variations in the production load is to use smaller batch quantities, but there are also other possibilities to smooth the load. In this paper we present a model for determining:

ISSN:0020-7543    

DOI:10.1080/00207548308942397

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

摘要:

This paper deals with selecting a heuristic rule for concurrent scheduling of mixtures of due-date and non-due-date jobs. The measure of performance for the mixture of jobs is chosen to be mean flowtime subject to the constraint that due dates are satisfied. To handle varying levels of due-date tightness, three types of schedules are introduced. Dispatching rules for two of the three types of schedules were selected by simulation. Decision rules for determining the best schedules in appropriate situations are suggested.

ISSN:0020-7543    

DOI:10.1080/00207548308942398

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

摘要:

It is shown that the concept of equivalent chip thickness allows the development. of general rules for the selection of cutting conditions in the two-pass turning operation. The paper is mainly concerned with the formulation of general guidelines for the subdivision of total depth of cut. The results indicate that, in most cases, the cost is minimized when the depth of cut in the initial pass is as great as possible.

ISSN:0020-7543    

DOI:10.1080/00207548308942399

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

摘要:

This paper presents a mathematical model to determine transitional as well as steady state probabilities of various system states in a conveyor-paced assembly line system with the line-conveyor subject to failure and repair. The analysis helps to predict the effect of system parameters on labour efficiency, output rate, and system down time. The on-line service time distribution has been taken as general for wider applicability. An optimization problem for a business concern is then formulated taking into account all the relevant economic implications, and solved for a numercial example by STJMT. The profit function is seen to be a concave function with the cost structure as presented here. The results of the numerical example give convincing evidence that, when the problem is seen in totality, neither worker utilization nor output remain the criteria for optimization.

ISSN:0020-7543    

DOI:10.1080/00207548308942400

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

摘要:

The use of forced comparisons in job evaluation is examined analytically to demonstrate how such characteristics as non-linearity of ranking, inconsistency of individual judges ranking and non-commonality of judgements of committees can be used to advantage in establishing job values.

ISSN:0020-7543    

DOI:10.1080/00207548308942401

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

摘要:

Point operations involve work performed under PTP control. Models to estimate performance time of such operations are proposed in the context of RTM. RTM, Robot Time and Motion, is a high-level robot task description language, which has been formulated to evaluate robot ability to perform a given task, estimate task execution time, and compare alternate robot work methods. In this article, the current capabilities of RTM are reviewed, and a simplified version for point operations is developed and demonstrated with Unimate 4000B in spot welding.

ISSN:0020-7543    

DOI:10.1080/00207548308942402

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

摘要:

In this paper we consider closed queueing networks havingMsingle server queueing stations with arbitrary interconnections and general service time distributions. Here we propose an iterative approximation procedure, based on a decomposition approximation. Numerical results are reported to demonstrate the accuracy of the method. We also discuss the sensitivity of the results to the initial guess for the server utilizations.

ISSN:0020-7543    

DOI:10.1080/00207548308942403

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

摘要:

The paper brings some interesting results of the investigation of the cutting edge wear at cutting of free cutting steels by cemented carbide plates. These steels are characterized by the additions of sulphur and lead to increase machinability. The experimental results have shown that the additives of sulphur and lead can strongly affect not only chip generation but also the form and rate of wear. Previous investigations have indicated clearly that the criterion of wear on the clearance faces provides too little information on tool life. The experimental results have also shown that at equal wear on the clearance face the form and rate of wear on the rake face differ essentially.

ISSN:0020-7543    

DOI:10.1080/00207548308942404

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

摘要:

A production planning problem for which the objective function contains both separable and fixed-charge components is formulated under the assumptions of separable constraint functions and a- minimum production level. It is shown that for this problem, the well known application of the λ separation technique can be extended to allow the separation variables, λ, to represent the fixed charge component as well as the nonlinear components of the objective function. The result is the formulation of an approximating problem that has a degree of solution complexity comparable to that of usual separable programs. An application of such formulation to the electric utility generation scheduling problem is presented.

ISSN:0020-7543    

DOI:10.1080/00207548308942405

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor

摘要:

njobs are to be processed on two or three machines. Each job must be processed in sequence, first on machine I than on machine II, etc. For each job, setup time, processing time, and removal time is known in each machine. Algorithms are developed which determine an optimal sequence that minimizes the total elapsed time. Numerical examples illustrate the algorithms.

ISSN:0020-7543    

DOI:10.1080/00207548308942406

出版商:Taylor & Francis Group    

年代:1983

数据来源: Taylor