摘要:

Programmable logic controllers (PLC) are used extensively for controlling discrete processes. The PLC's versatility is based on its reprogrammability, but this versatility is bought at the expense of program correctness and verification. Modifications to existing PLC programs, or generation of new ones, requires the use of the controller and the hardware associated with it in order to debug the new instructions. This leads to a greatly increased program design cycle as equipment down-times must be scheduled to accommodate debugging. At the same time, testing uncertain instructions on the plant floor places all the hardware connected to the PLC in jeopardy of damage due to program errors.

ISSN:0020-7543    

DOI:10.1080/00207549208942884

出版商:Taylor & Francis Group    

年代:1992

数据来源: Taylor

摘要:

In general it is best to improve the quality of production processes to the point where inspection is minimal. It follows that incoming raw material usually should be of high quality. However, it can be disastrous if poor quality raw material is utilized by a production-inspection system optimized under the expectation of excellent raw material. Thus if there is uncertainty in the quality of incoming raw materia], the production-inspection system should be dynamically adjusted to accommodate this variability. In this paper a sampling plan is described which serves as the basis for making dynamic adjustments to the production-inspection system. An upper bound is determined for the amount (given the potential gain) that should be spent on sampling the raw material.

ISSN:0020-7543    

DOI:10.1080/00207549208942885

出版商:Taylor & Francis Group    

年代:1992

数据来源: Taylor

摘要:

In spite of its earlier development, SG iron is finding applications only recently in the automotive sector. This has been attributed to difficulty in the foundry as well as lack of data in its machinability. The present paper illustrates data in the machinability of SG iron with recently developed coated tools. The existence of a critical velocity for the various tools is highlighted in this paper.

ISSN:0020-7543    

DOI:10.1080/00207549208942886

出版商:Taylor & Francis Group    

年代:1992

数据来源: Taylor

摘要:

In this paper several procedures for sequencing products on a mixed-model assembly line in a just-in-time production system are statistically compared using simulation analysis. The procedures include two 'goal chasing' heuristics developed at Toyota that focus on constant component usage, an algorithm developed by Miltenberg designed to achieve uniform production rates for each model, a time spread method developed by the authors that smooths the work load at each assembly line station, and the familiar batch sequencing procedure frequently used in practice. These five sequencing procedures are evaluated according to four measures of assembly line inefficiency, work not completed, worker idleness, worker station time and a measure of variability in uniform component usage. The results provide assembly line managers with guidelines for selecting the most effective sequencing procedure for achieving their operational objectives.

ISSN:0020-7543    

DOI:10.1080/00207549208942887

出版商:Taylor & Francis Group    

年代:1992

数据来源: Taylor

ISSN:0020-7543    

DOI:10.1080/00207549208942888

出版商:Taylor & Francis Group    

年代:1992

数据来源: Taylor

ISSN:0020-7543    

DOI:10.1080/00207549208942890

出版商:Taylor & Francis Group    

年代:1992

数据来源: Taylor