摘要:

Hardware failures notwithstanding, the ability of an automated system operating according to promised potential is dependent upon the operational control measures in force. In this paper, some heuristic rules for dispatching Automatic Guided Vehicles (AGVs) in a job shop environment are presented. The rules are useful for assigning priorities to work stations requesting the services of a vehicle for material pickup. The likely effects of these rules on the performance of a job shop are postulated. Simulation results to demonstrate the effects of these rules arc also presented.

ISSN:0020-7543    

DOI:10.1080/00207548408942459

出版商:Taylor & Francis Group    

年代:1984

数据来源: Taylor

摘要:

This paper reports on research conducted on the use of priority dispatching rules in a hybrid assembly/job shop which manufactures both single-component and multiple-component products. A simulation model was constructed and a large stale experiment performed. Statistical analysis of the simulation results indicated significant impact of both the priority rules tested, and the product-mix considered on shop performance.

ISSN:0020-7543    

DOI:10.1080/00207548408942460

出版商:Taylor & Francis Group    

年代:1984

数据来源: Taylor

摘要:

In this paper we consider a single server queueing model for a single machine dynamic job shop in which shop level scheduling is not permitted. External arrivals of jobs are received in a dispatch area from which their release to the job shop is controlled. To overcome the limitation of operational control, we propose three different dispatch policies and compare their performances to that of a first come first served dispatch policy. The four dispatch policies considered are (1) first come first served, (2) scheduling within generations, (3) scheduling within periodic review, and (4) scheduling within fixed batch sizes.

ISSN:0020-7543    

DOI:10.1080/00207548408942461

出版商:Taylor & Francis Group    

年代:1984

数据来源: Taylor

摘要:

The multi-stage problems such as joint replenishment (JRP), single machine lot scheduling (SMLS) and the assembly system, though similar, have unique inherent constraints. The lot size computation procedure developed for any one of the above systems cannot, therefore, be directly applied to the other systems.

ISSN:0020-7543    

DOI:10.1080/00207548408942462

出版商:Taylor & Francis Group    

年代:1984

数据来源: Taylor

摘要:

Japanese management techniques have captured the attention of industry throughout the world. Attempts have been made to implement some of these techniques in plants outside Japan. This paper focuses on Japanese manufacturing management techniques, specifically just-in-time (JIT) production with total quality control (TQC). Brief explanations of JIT and TQC, with discussion on the transferability of the technology, are given, followed by a description of the problems encountered by manufacturing firms in developing countries. An attempt is made to show the potential of JIT and TQC to ease some of these problems.

ISSN:0020-7543    

DOI:10.1080/00207548408942463

出版商:Taylor & Francis Group    

年代:1984

数据来源: Taylor

摘要:

This paper considers the use of group technology concepts in designing production systems. A classification system is used to identify machine-component groupings which determine facility layout and production scheduling. A design approach is developed which aims at minimizing the operating cost of the production system, composed of setup cost and inventory carrying cost.

ISSN:0020-7543    

DOI:10.1080/00207548408942464

出版商:Taylor & Francis Group    

年代:1984

数据来源: Taylor

摘要:

This paper introduces a model for efficient utilization of warehouse personnel in an inventory selection process. A simple mathematical model, based on a time study that can be applied to establishing standards for efficiency measurement of labour in a warehouse setting is presented. The problem of determining a standard to compute performance in an environment with variable workload is solved by using an adjustable standard for each particular assignment. Specifically the proposed model is designed to estimate the time required to complete a picking cycle. Three time components are considered; the lead time, travel time, and non-efficient time. The results of an empirical study are used to set the values of system parameters.

ISSN:0020-7543    

DOI:10.1080/00207548408942465

出版商:Taylor & Francis Group    

年代:1984

数据来源: Taylor

摘要:

Surfaces generated by machine tools are the fingerprint of the machine and tool combination. Any change in the condition of either should be reflected in the component produced, especially in the nature of the component surface generated and its dimensions. This paper investigates the possibility of using this approach to monitor the condition of the machine tool in order to predict failure or deterioration in performance.

ISSN:0020-7543    

DOI:10.1080/00207548408942466

出版商:Taylor & Francis Group    

年代:1984

数据来源: Taylor

摘要:

This paper presents results from a simulation experiment evaluating 14 different single stage lot-sizing procedures. Uncertainty in the form of forecast errors was used as one factor in the experiment. In order to prevent different service levels from confounding cost comparisons, enough safety stock to achieve a 100% service level in all situations was introduced. The ranking of the rules under uncertainty turned out to be very different from the ranking when no demand uncertainty was present. Statistical differences were found between the six best lot-sizing procedures when there was no uncertainty. When forecast errors were present, however, no differences existed for the six best rules in this situation. Thus, uncertainty not only changed the relationship between the lot-sizing rules, but also the character of this relationship.

ISSN:0020-7543    

DOI:10.1080/00207548408942467

出版商:Taylor & Francis Group    

年代:1984

数据来源: Taylor

摘要:

The uncertainty inherent in material requirements planning (MRP) systems is of two general types: demand uncertainty and supply uncertainty. Supply uncertainty is a result of late deliveries (timing) or order shrinkage (quantity) or both. The purpose of this paper is to examine the impact of operating policies on an MRP system given supply uncertainty resulting from timing factors, specifically the uncertainty caused by variability in the lead time of purchased parts. Experiments arc conducted to assess the impact of four factors: the amount of lead time variability, the amount of safety stock or safety lead time, the lot-size rule, and the holding cost and lateness penalty, on the total cost of the MRP system given supply/timing uncertainty. An MRP/Production simulator is employed to perform the experiments. Practical guidelines for the manager of an MRP system with supply/timing uncertainty are presented.

ISSN:0020-7543    

DOI:10.1080/00207548408942468

出版商:Taylor & Francis Group    

年代:1984

数据来源: Taylor