摘要:

The machine-component matrix is the main input to most machine-component grouping models used in cellular manufacturing. A number of measures have been developed for performance evaluation of machine-component grouping algorithms. In this paper, the relationship between these measures and the performance of the corresponding cellular manufacturing system is evaluated and a new grouping measure is developed which is more consistent in predicting the suitability of a manufacturing system for cellular manufacturing.

ISSN:0020-7543    

DOI:10.1080/00207549608904960

出版商:Taylor & Francis Group    

年代:1996

数据来源: Taylor

摘要:

Sequencing flexibility refers to the possibility of interchanging the order in which required manufacturing operations are performed. In this paper, we address several issues related to the modelling, measurement and performance evaluation of this flexibility in manufacturing systems. In particular, we introduce several representation and measurement schemes for sequencing flexibility and discuss the usefulness and limitations each. We then propose a new performance-based approach for quantifying the value of flexibility. To this effect, we study the relationship between flexibility and system performance under a variety of design assumptions and operating conditions. These relationships are used to identify key characteristics of a measure of flexibility that is reflective of system performance. This measure is to allow system designers and managers to predict performance based on existing levels of flexibility and/or determine the amount of flexibility required to achieve a certain level of performance. This measure is shown to be easier to calculate than traditional performance measures and to be possible to use as a substitute for these measures in estimating the effect of flexibility on performance.

ISSN:0020-7543    

DOI:10.1080/00207549608904961

出版商:Taylor & Francis Group    

年代:1996

数据来源: Taylor

摘要:

This article reviews the published material relating to the integration of computer aided design with automatic or semi-automatic off-line programming systems for coordinate measuring machines. Numerous techniques have been developed and demonstrated in research systems for the creation and validation of inspection plans and are now becoming available in commercial systems. Fully automated inspection planning is not yet generally available, primarily due to the problems of tolerancing 3D CAD models and transferring this information to OLP systems.

ISSN:0020-7543    

DOI:10.1080/00207549608904962

出版商:Taylor & Francis Group    

年代:1996

数据来源: Taylor

摘要:

This paper first proposes a methodology for manufacturing strategy development based on a critical review of the theory of manufacturing strategy. The methodology captures the essential factors that must be considered, and the steps that must be taken, by a firm attempting to design a viable manufacturing strategy. An exploratory study of the process of formulating and implementing manufacturing strategy practised by three firms is conducted. Their experiences in the manufacturing strategy process are reported and analysed. While the practice of each firm is different, the process of manufacturing strategy formulation seems to be in line with the conceptual models discussed in the literature. Our findings offer some evidence that manufacturing is slowly shedding its image as the ‘missing link’ in corporate strategy. While managers of the studied firms are fully aware of the competitive advantages that manufacturing can provide, they are not totally committed to articulating a manufacturing strategy because of concerns about its successful implementation. It is proposed that further research on manufacturing strategy focus on such implementation issues as the infrastructure, corporate culture, performance measurements, decision-making and managerial styles.

ISSN:0020-7543    

DOI:10.1080/00207549608904963

出版商:Taylor & Francis Group    

年代:1996

数据来源: Taylor

摘要:

Computerized machinability database systems are essential for the selection of optimum cutting conditions during process planning, and these form an important component in the implementation of computer integrated manufacturing (CIM) systems. This paper presents a comparative analysis of the different model building techniques available in commercial statistical packages, to select the most suitable technique for use in machinability database systems. The techniques analysed are; backward elimination, forward selection, stepwise regression, and all possible subset regression. Experimental machining response data for the surface roughness when turning grey cast iron (154 BHN) and steel (140 BHN) have been analysed to evaluate the four model building techniques. Second order polynomial model structures with logarithmic transformation of the variables has been used for building adequate models. The adequacy of the fitted regression equation is checked by analysing the residuals. Based on the results of this analysis, the advantages and limitations of the four different techniques for building machinability models are discussed. It has been found that the backward elimination and all possible subset regression are the best suited techniques for model building in machining database systems.

ISSN:0020-7543    

DOI:10.1080/00207549608904964

出版商:Taylor & Francis Group    

年代:1996

数据来源: Taylor

摘要:

An efficient predictive model is proposed for analysing the throughput rate of balanced serial production lines where all stations are identical and buffers between stations have the same capacity. The predictive model is based on the simulation data. The experimental design and analysis technique is used to conduct the simulation experiments and the regression analysis method is used to build the predictive model. The model can be applied to a wide range of values in terms of the coefficient of variation of processing times at stations, the buffer size between stations and the number of stations in a system. Comparisons are made with simulation results and previous works. The model can also be extended to account for situations where different stations have different coefficients of variation of processing times.

ISSN:0020-7543    

DOI:10.1080/00207549608904965

出版商:Taylor & Francis Group    

年代:1996

数据来源: Taylor

摘要:

This paper deals with the problem of determining an optimum unit load size of automated guided vehicle (AGV) in an electronics assembly production line. It is assumed that an AGV delivers assembly parts to each workstation from a miniload automated storage/retrieval system and a conveyor line transports subassemblies between workstations. Two types of operating policies for the AGV system are proposed. For each policy, a nonlinear mathematical model is formulated. Based on the characteristics of the objective function and feasible region, a solution algorithm is developed, which finds an optimum unit load size. To illustrate the models, problems are chosen and solved.

ISSN:0020-7543    

DOI:10.1080/00207549608904966

出版商:Taylor & Francis Group    

年代:1996

数据来源: Taylor

摘要:

Feature-based design is an approach that promises substantial benefits in capturing and transferring a designer's intent to other stages of design and manufacturing, thereby helping to integrate the diverse functions associated with design and manufacturing. While feature-based design has considerable potential, it has been applied almost entirely to mechanical design. Furthermore feature-based design has been implemented in a relatively ad hoc manner and, consequently, much of the work on feature-based design cannot be readily applied to other domains. This paper aims to address some of this deficiency by describing a feature-based design system for electronic manufacture that is based on the firm formalism of a feature algebra and a feature-based design algorithm. An electronics assembly feature taxonomy is developed, together with feature operators and validation scheme. These are used to build a prototype feature-based design system called Feature-Based Design of Electronics Assemblies (FEBEA). The format of this paper is as follows. The representation formalism is briefly described. The electronics assemblies design domain is then detailed. The design domain is formally defined and an electronics assemblies design module is constructed. A testability evaluation module is then developed. Finally the prototype implementation of FEBEA is described, and how design is represented and performed using FEBEA is illustrated through an example design scenario. The contribution of this paper is, first, to place the feature-based design of electronics assemblies on a firm formalism foundation. Second, to develop a feature taxonomy for electronics assembly design. Third, to define feature operators and feature validity for electronics assemblies. Fourth, to develop a feature transformation scheme for testability evaluation. Finally, to show how such a feature-based approach can be implemented. The overall result is an approach that allows the designer to design an electronics assembly iteratively, taking into account the available components, constraints on such aspects as component placement, and taking into account Concurrent Engineering constraints. It would appear that the underlying approach could be applied to other domains.

ISSN:0020-7543    

DOI:10.1080/00207549608904967

出版商:Taylor & Francis Group    

年代:1996

数据来源: Taylor

摘要:

An increasing number of organizations are using Activity Based Costing (ABC) to gain insight into manufacturing activities and processes as well as product costing. The natural logic of ABC can also be applied to strategic decisions. This paper presents a methodology that ties investment decisions to ABC concepts using the Analytical Hierarchy Process (AHP). By using AHP, both monetary and non-monetary benefits can be included in the analysis. First, the relationships between goals, activities, cost, and performance measures are developed, then they are combined to make two models: a cost impact model and a performance impact model. The final selection is made using a cost vs performance graph. The goal of the decision process is to evaluate investment alternatives based on their impact on activities and their contribution to organizational goals.

ISSN:0020-7543    

DOI:10.1080/00207549608904968

出版商:Taylor & Francis Group    

年代:1996

数据来源: Taylor

摘要:

We consider a part-mix allocation problem in a hybrid manufacturing system (HMS) composed of a flexible manufacturing cell (FMC) and a conventional jobshop with the objective of minimizing makespan. The problem is to find the best part-mix allocation to the FMC and the conventional jobshop for a given set of part types to be produced during the upcoming planning horizon. For the problem, we should solve the jobshop and the FMC scheduling problems for each part-mix allocation alternative. Because of the computational difficulty of each of the scheduling problems, we use heuristics: list scheduling method for the jobshop scheduling problem and a part grouping algorithm called the maximal intersection minimal union heuristic for the FMC scheduling problem. Then, for the entire part-mix allocation problem, we develop a branch and fathoming algorithm that uses the two scheduling heuristics. These algorithms, when combined, give a good part-mix allocation and production schedules in the FMC and the conventional jobshop at the same time. Computational results show that the branch and fathoming algorithm requires much shorter computation time than a full enumeration method and can solve problems of a practical size in a reasonable amount of time.

ISSN:0020-7543    

DOI:10.1080/00207549608904969

出版商:Taylor & Francis Group    

年代:1996

数据来源: Taylor