摘要:

A simulation model is developed for a jobbing shop, which consists of two identical machines operating in parallel. Jobs, which have a Poissonian arrival, join a single queue and can be processed on either machine. The jobs have an estimated processing time, which is generated from a negative exponential distribution. The actual processing times, however, are subject to variation; deviations from the estimated times follow a normal distribution. Due dates for completing the jobs are quoted, based on estimated process times and on arrival times.

ISSN:0020-7543    

DOI:10.1080/00207546708929764

出版商:Taylor & Francis Group    

年代:1967

数据来源: Taylor

摘要:

Parts I and II of this paper were concerned with a model based on the CULOG form of the learning curve, its comparison with existing functions, and its applications in the training of employees. In the present part it is proposed to discuss briefly the applications of the model in forecasting future production levels of new products (or of products in new plants) and in production control generally.

ISSN:0020-7543    

DOI:10.1080/00207546708929765

出版商:Taylor & Francis Group    

年代:1967

数据来源: Taylor

摘要:

The analytical procedure of predetermined motion time systems is based on the premise that time standards can be determined by adding elemental times, fixed once and for all and conceived as universally applicable.

ISSN:0020-7543    

DOI:10.1080/00207546708929766

出版商:Taylor & Francis Group    

年代:1967

数据来源: Taylor

摘要:

This paper discusses a method for determining the optimal characteristics for a machine which fabricates two-dimensional products. The machine is a high-speed, high-cost, continuous processing facility. The end products of this continuous operation, called intermediate inventory, are stored and then used as input for a low-speed, low-cost, job-shop operation which finishes them to customers' dimensional specifications.

ISSN:0020-7543    

DOI:10.1080/00207546708929767

出版商:Taylor & Francis Group    

年代:1967

数据来源: Taylor

摘要:

In planning production or new plants it is necessary to pre-calculate exactly the required number of operators and their equipment and machine tools. Such data are used also in calculating the efficiency of technical equipment and types of buildings required by new plant. It is seldom possible to use data based on experience gained from the former course of production, for normally the aim of replanning is to alter these conditions. Therefore, data are needed on time requirements at the different work-places. These.data have to indicate the influence of any alteration in the workplace. Such standards on time requirements can only be derived from work experiments. As agriculture proves, even standards concerning complicated operations can be fixed in advance and can be varied exactly with the planned project. In general, standards concern smaller parts of an operation, but they can also be summed up to give times for complete operations or even complete production plans when listed in catalogues.

ISSN:0020-7543    

DOI:10.1080/00207546708929768

出版商:Taylor & Francis Group    

年代:1967

数据来源: Taylor

摘要:

This paper is concerned with the evaluation of tool stresses in the orthogonal cutting process. Theory and elasticity methods are applied to determine these stresses within the elastic region. In this analysis the tool is considered as a wedge with the normal and frictional loading on the rake face. For general conditions of loading it has been found that the equivalent stresses are or the order of a hundred thousand pounds per square inch. It has also been found that the equivalent stresses decrease with positive rake and increase with negative rake.

ISSN:0020-7543    

DOI:10.1080/00207546708929769

出版商:Taylor & Francis Group    

年代:1967

数据来源: Taylor