摘要:

This paper outlines a method for the evaluation of flexible manufacturing systems (FMS), which considers both economics and strategic aspects. The firm strategic position, in fact, is turned into a few performance indicators, each expressed numerically. The manufacturing system must perform within given values of these indicators, which act as constraints. Then connections between the cost of obtaining strategic performances and the flexibility of the manufacturing system are defined; this allows one to express net cash flows, used to compute profitability, as a function of the strategic position of the firm.

ISSN:0020-7543    

DOI:10.1080/00207548908942583

出版商:Taylor & Francis Group    

年代:1989

数据来源: Taylor

摘要:

This paper presents measures which quantify the notion of how well manufacturing systems, in which machines are assigned to participate in tasks, can absorb changes in the environment. Several measures are proposed and their properties discussed. This paper takes the viewpoint that such measures are relative to reference task-sets.

ISSN:0020-7543    

DOI:10.1080/00207548908942584

出版商:Taylor & Francis Group    

年代:1989

数据来源: Taylor

摘要:

Since no exact analytical method for solving the three-dimensional cargo-loading problem has been developed, the heuristic approaches with practical assumptions are still useful. A dynamic programming approach to this problem is proposed in this paper. Loading a three-dimensional cargo space is done layer by layer, a special property which is taken advantage of in the proposed algorithm. The computational performance of this heuristic is demonstrated by comparing its results with suggested values published by the General Services Administration, Washington, DC.

ISSN:0020-7543    

DOI:10.1080/00207548908942585

出版商:Taylor & Francis Group    

年代:1989

数据来源: Taylor

摘要:

The formation of part families and technology cells is a step in implementing Group Technology, In this paper we show that the simple cell-formation problem is equivalent to the Generalized Assignment Problem (GAP). Furthermore, we show that the general case of cell formation, in which several process plans are considered for each part type, is also equivalent to the GAP.

ISSN:0020-7543    

DOI:10.1080/00207548908942586

出版商:Taylor & Francis Group    

年代:1989

数据来源: Taylor

摘要:

The authors compare two well-known methods for setting manufacturing lead times (flow allowances) in a general job shop when early shipment of completed jobs is forbidden. One of the methods for setting a job's allowance is to make it proportional to the total processing time for the job. This method, referred to as TWK., is compared to a second method PPW. With the PPW method, a job's allowance is obtained by adding to the total job-processing time an allowance for waiting that is proportional to the number of operations that the job requires. The two allowance methods are compared using a computer simulation of an 8-machine job shop. The model is unique in that jobs are not permitted to leave the shop early. This feature of forbidding early shipment (FES) complicates the comparison between allowance methods because it draws the issue of finished-order inventory management into the analysis. Results of computer simulations over a wide range of average due-date difficulty suggest that TWK is the dominant procedure by virtue of providing both tower tardiness and lower inventory.

ISSN:0020-7543    

DOI:10.1080/00207548908942587

出版商:Taylor & Francis Group    

年代:1989

数据来源: Taylor

摘要:

In this paper we develop an expert system for multiple-criteria facility layout problems. The facility layout problem is identified as an ill-structured problem; our approach for solving it is based on expert systems and multiple-criteria decision making (MCDM). The expert system interacts with the decision maker (DM), and reflects the DM's preferences in the selection of rules and priorities. The inference engine is a forward-chaining reasoning procedure which is discussed in detail. The approach consists of two parts: (a) construction of a layout based on a set of rules and restrictions, and (b) improvement of the layout based on interaction with decision maker. The MCDM expert system approach considers and incorporates the multiple criteria in these two parts as follows. In (a) it uses priorities on the selection of rules, adjacency of departments, and departments for construction purposes. In (b) it uses different objectives such as materials handling cost, flexibility, and materials handling time for paired comparison of generated layouts for improvement purposes. Some experiments with the developed computer package are reported and an example is solved.

ISSN:0020-7543    

DOI:10.1080/00207548908942588

出版商:Taylor & Francis Group    

年代:1989

数据来源: Taylor

摘要:

Recent findings in production research have demonstrated that bias in forecasts may improve system performance in a simulated multiple-product MRP system, and optimal planned bias can be identified for simulated single product MRP settings. This paper provides an analytical approach and theoretical evidence that optimal planned bias exists to minimize the expected loss for the traditional EOQ model, as well as for the Newsboy model, when relaxing the assumption of known demand rate in the EOQ model and the assumption of known boundary of demand distribution in the Newsboy problem. Findings of this paper also provide a rationale for impact of forecast errors on cost behaviour, and facilitate a benchmark for comparing different findings of previous research work.

ISSN:0020-7543    

DOI:10.1080/00207548908942589

出版商:Taylor & Francis Group    

年代:1989

数据来源: Taylor

摘要:

This paper aims to clarify the properties of the ordering systems of the international co-operative knockdown production systems (ICKDPS) for mutual country's development. The ICKDPS consists of a three-stage production, inventory and transportation system. Two types of ordering models based on the pull-type ordering system are formulated, and the relations between the transportation lead time and variations of ordering quantity and inventory quantity are analysed in an attempt to improve the productivity and reliability of the ICKDPS.

ISSN:0020-7543    

DOI:10.1080/00207548908942590

出版商:Taylor & Francis Group    

年代:1989

数据来源: Taylor

摘要:

In recent years significant worldwide research effort has been directed towards the computer representation of manufacturing decision-making logic, especially in its application to process planning. This paper describes the concept of a machine planner, which can provide detailed machine-specific planning information to aid both in process-planning decision making and NC code generation. Machine planning decisions are made by integrating manufacturing data, constraints and methods with solid model information. The problem of planning for different machine-tool types is considered, while concentrating on the machining of prismatic parts on 3-axis vertical machining centres in its current software implementation. The use and structure of pre-defined, parametric, manufacturing features in solid models is discussed.

ISSN:0020-7543    

DOI:10.1080/00207548908942591

出版商:Taylor & Francis Group    

年代:1989

数据来源: Taylor

摘要:

Control of a flexible manufacturing system (FMS) is a complicated task due to the wealth of feasible alternatives. Such control is done hierarchically: in the cell level, part scheduling is considered; in lower levels the equipment control strategy is looked at.

ISSN:0020-7543    

DOI:10.1080/00207548908942592

出版商:Taylor & Francis Group    

年代:1989

数据来源: Taylor