ISSN:0020-7543    

DOI:10.1080/00207548708919818

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

摘要:

In this paper an approach to the development of flexible production systems based on GT-principles is described.

ISSN:0020-7543    

DOI:10.1080/00207548708919819

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

摘要:

Some cost models of the made-to-order production situation incorporate learning and production rate as cost factors. The model developed in this paper is more detailed than the previous efforts. Here the build up of work-in-process to a steady state is explicitly modelled. Likewise, the decrease in work-in-process at the end of the programme is modelled. In this paper, we minimize cost to determine the appropriate task sizes and sequence of resources to allocate to crews of assembly workers. Crew cycle times are also determined.

ISSN:0020-7543    

DOI:10.1080/00207548708919820

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

摘要:

Boring Trepanning Association (BTA) drills are capable of machining holes having large length to diameter ratio in a single pass. The study of the accuracy and surface finish of holes produced would reveal quite useful information regarding the process.

ISSN:0020-7543    

DOI:10.1080/00207548708919821

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

摘要:

This paper examines how multi-product, multi-level production control systems may be represented in terms of discrete linear control theory models. The transfer functions are derived for material requirements planning (MRP) and re-order cycle systems. The performance of each type of system is derived under selected conditions and the way in which a general system may be analysed is described. The method has proved easy to use. Computer programs exist which enable one to assemble the elements of proposed forecasting, inventory and production control systems, and hence determine the stability and transient and steady state responses to standard inputs. This has proved to be a quick and efficient way of evaluating alternative production systems and examining whether better methods of, for example, stock re-ordering or forecasting are required.

ISSN:0020-7543    

DOI:10.1080/00207548708919822

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

摘要:

Traditional methods of estimating the ‘process average’ defect rate of a manufacturing process involves selecting a fixed number of items from the process and using the sample defective proportion as its estimate. If the estimate is required to have a precision proportional to the true process average defect rate, the sample size required is dependent on that true process average. When prior knowledge about the process average is uncertain and its value is low, as in most modern production situations, this binomial sampling scheme often fails to meet the predetermined precision specifications or results in an unnecessarily large number of observations. A well-known sequential estimation method called inverse negative binomial sampling is considered as a potentially more efficient alternative to the traditional binomial fixed sample size approach, particularly under such circumstances. Several existing estimators for the method are presented and compared, from which derives a general estimator whose closed form expressions permit simple determination of moments for estimators fitting this general form. A new estimator is then derived from the general estimator and is shown to be more efficient than the existing ones. The precision of the sequential estimation method using the new estimator is shown to be virtually insensitive to a prior knowledge of the true process average, thereby avoiding the need to provide an initial estimate of it, and therefore making it potentially attractive in practical applications.

ISSN:0020-7543    

DOI:10.1080/00207548708919823

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

摘要:

Assembly line job sequencing establishes the order in which jobs are processed by an assembly line. This research focuses on job sequencing methods for assembly lines with work stations that receive the same fixed job sequence, are coupled together so that there is no work-in-process storage, and are balanced so that jobs move continuously between them at a constant rate. Automobile assembly lines frequently have these characteristics. Simple analytical principles are derived that aid in evaluating trade-offs between different job sequencing objectives. Included are set-up cost objectives related to operations performed on every job but in different choices (e.g. automobile painting) and capacity utilization objectives related to operations not performed on every job (e.g. installing vinyl roofs). These principles provide the basis for a job sequencing method that can be applied either by hand or with the help of a simple sorting routine.

ISSN:0020-7543    

DOI:10.1080/00207548708919824

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

摘要:

Group technology is a management philosophy capable of jointly simplifying management control and improving productivity. This paper proposes a heuristic approach to the economic determination of machine groups and their corresponding component families for group technology. The procedure considers costs of work-in-process and cycle inventory, intra-group material handling, set-up, variable processing and fixed machine costs. The three stage procedure initially reorders part types based on routing similarity. An attempt is then made to combine adjacent part types to reduce machine requirements. Finally groups are combined where economic benefits of utilization offset those of set-up, work-in-process and material handling. Examples illustrating the procedure and potential savings are included.

ISSN:0020-7543    

DOI:10.1080/00207548708919825

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

摘要:

The paper outlines the features of an ‘intelligent’ interface based on local area network (LAN) protocols, which was designed to enable a variety of computer controlled manufacturing machines to be linked together and integrated with supervisory computers performing control, data-base and production management functions. The use of this interface provides the basis of a general solution to the problems of flexibility and efficient utilization within manufacturing environments. To illustrate the use of the interface, the paper presents some examples of the utilization of shared resources on a computer network to improve the processing facilities available at robot controllers. Also included is a brief discussion of the nature of communication with computer controlled manufacturing machines.

ISSN:0020-7543    

DOI:10.1080/00207548708919826

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

摘要:

The interruption of production on machines which are set up for a specific product incurs idle time costs but reduces inventory holding costs. This phenomenon is generally ignored in multi-stage inventory models. Interrupted production runs are economical when the additional costs generated by restarting the machines and by idle time are off-set by the reduced frequency of major set-up costs and by decreased inventory holding costs. Under these circumstances, the machine idle-time can be optimized for each stage. An appropriate production/inventory model for this situation and a suitable optimization method are developed; the method is illustrated by an example.

ISSN:0020-7543    

DOI:10.1080/00207548708919827

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor