摘要:

Computer Aided Process Planning (CAPP) has been recognized as playing a key role in Computer Integrated Manufacturing (CIM). In the last two decades, a tremendous effort has been made in developing CAPP systems. However, the benefits of CAPP in the real industrial environment are still to be seen. In this paper, a comprehensive summary on the state-of-the-art and projection of future trends in CAPP is presented to help make decisions concerning CAPP implementation today and to aid in guiding research for tomorrow. We systematically overview the historical background of the development of CAPP and discuss the current techniques which includes the implementation approaches, GT technology, application of AI techniques, programming languages, etc., for implementation CAPP systems. About 14 well-known CAPP systems, which are based on the variant, generative or semi-generative approach, are briefly introduced in this paper. In total about 156 currently existing CAPP systems are listed in Table 1 in the appendix. Table 1 provides the general information of the existing systems, such as the characteristics of the systems, the domain of planable workpieces, implementation approaches, commercial situation, interfacing abilities, programming languages, references, and developers, etc. Future trends proposed in this paper covers the topics about interfacing, integration, AI techniques, and single data base systems, as well as PC, workstations and software migration strategy, etc., which might be used to guide coming research. More than 200 technical papers have been read and are referenced at the end of this paper.

ISSN:0020-7543    

DOI:10.1080/00207548908942569

出版商:Taylor & Francis Group    

年代:1989

数据来源: Taylor

摘要:

A two stage model for joint optimization of production volume and communication system cost for a multi-product manufacturing system has been developed. Stage I minimizes penalty cost, which includes costs due to under-achievement of production targets and over-fulfilment of production capacities, and determines the optimal production volumes in order to achieve the desired production plan with the available physical capacities at various stations. Stage II determines optimal design parameters for communication systems while minimizing the total penalty cost and achieving the near-optimal production volumes of stage I. A case example is discussed thereafter which illustrates the importance of joint optimization of resources as against independent optimization.

ISSN:0020-7543    

DOI:10.1080/00207548908942570

出版商:Taylor & Francis Group    

年代:1989

数据来源: Taylor

摘要:

This paper presents an evaluation of the main established approaches to modelling and simulating manufacturing systems. These are the event, activity and process modelling methods, and the language and data-driven means of creating a simulation. The evaluation has been carried out by the use of case studies of actual manufacturing systems using different simulation languages to explore the methods and the language features necessary to simulate manufacturing systems. Twenty-five aspects of the methods and languages have been evaluated and these are presented and discussed.

ISSN:0020-7543    

DOI:10.1080/00207548908942571

出版商:Taylor & Francis Group    

年代:1989

数据来源: Taylor

摘要:

Starting with forecast demand data, the methodology to be described here can derive a detailed production schedule which provides smooth continuous operations in a modern steel manufacturing system. The production schedule will satisfy the customers' orders and other desired objectives at the lowest possible energy costs. Two mathematical programming models and a sequencing heuristic are developed at different levels of an integrated control hierarchy. A simulation model, used to evaluate the planned system and investigate the primary results, has also been built. The statistical analysis indicates the performance improvements of the planned steel making process.

ISSN:0020-7543    

DOI:10.1080/00207548908942572

出版商:Taylor & Francis Group    

年代:1989

数据来源: Taylor

摘要:

The problem of production control with disturbances is introduced. Given the target amount needed, the due date and the amount produced up to a certain inspection point, we have to determine the new production speed and the next inspection point so that the minimal speed will guarantee meeting the target points on time on the average. Two objectives are imbedded in this heuristic algorithm: to minimize the number of inspection points, and to maximize the probability of completing the production on the due date. A stochastic optimization formulation is presented followed by a heuristic solution, a numerical example is given, and simulation results are presented.

ISSN:0020-7543    

DOI:10.1080/00207548908942573

出版商:Taylor & Francis Group    

年代:1989

数据来源: Taylor

摘要:

This paper reports the results of a comprehensive review and analysis of the assembly line balancing literature. Quantitative developments and qualitative issues are addressed at both the strategic and tactical levels. The numerous quantitative and qualitative factors which the literature mentions could impact the design, balancing and scheduling of assembly systems are organized into an eight-level hierarchical, factor/decision taxomony. This comprehensive taxonomy is used to assess our progress in assembly system design and operation. Finally, from the results of the literature review and progress assessment, suggestions for future research on socio-technical assembly systems are offered.

ISSN:0020-7543    

DOI:10.1080/00207548908942574

出版商:Taylor & Francis Group    

年代:1989

数据来源: Taylor

摘要:

Single-stage job-shop scheduling has received a great deal of attention in the published literature. Significantly less research has been done in the area of assembly job shops. With the onslaught of MRP implementations designed to plan and control assembly job shops, practitioners have been confronted head-on with the need to improve dispatching procedures. This paper examines the effect of three different product structures on the performance of selected priority dispatching rules in a six-machine assembly job shop. Results indicate that significant relationships exist between the structure of the product bill of materials and the priority dispatching rule, and that specific rules are indeed better suited to certain product structures.

ISSN:0020-7543    

DOI:10.1080/00207548908942575

出版商:Taylor & Francis Group    

年代:1989

数据来源: Taylor

摘要:

The paper describes two fast iterative algorithms for estimating the capacity of automated production lines with finite buffers. These algorithms are based on the linear programming formulation of the problem developed earlier by the author, and provide a range of values in which the throughput of the line is expected to lie. The throughput estimates of the two algorithms, compared with an estimate based on a simple workload analysis, indicate the amount of blocking/starvation as well as the probable causes of this unproductive time. The paper illustrates how inferences can be drawn from the two algorithms and used to improve the loading sequence and lot sizes. Managers can decide if the potential for improvement, which would be to get rid of all blocking/starvation, justifies the time to be spent on such an effort. New alternatives can be developed based on the insights provided by the algorithms and tested quickly.

ISSN:0020-7543    

DOI:10.1080/00207548908942576

出版商:Taylor & Francis Group    

年代:1989

数据来源: Taylor

摘要:

A flow control method is presented for a flexible manufacturing cell where the performance criterion is to minimize stockout costs in meeting time-varying demands from downstream cells. The cell operation is constrained by limited buffer space, workstation failures, and varying input rates from upstream cells. An optimization model is solved periodically to determine the required workflow rate and associated flow-control directives. Some computational results are provided and further research issues are discussed.

ISSN:0020-7543    

DOI:10.1080/00207548908942577

出版商:Taylor & Francis Group    

年代:1989

数据来源: Taylor

摘要:

Previous work on optimal allocation of work to production line systems has found that the throughput of a production line is maximized by deliberately unbalancing the line in an appropriate way when the processing time distribution is exponential or Erlang. A recent simulation study suggests that unbalancing the production line may not improve the efficiency of the line when the processing times are normally distributed. However, it appears that the unbalanced work allocation being studied may not be chosen appropriately in the simulation study and therefore, no significant improvement (and actually a decrease) in performance was observed when compared with the perfectly balanced work allocation. This study performs a similar set of simulation experiments of the previous study with normally distributed processing times, but uses more appropriate unbalanced work allocations to determine whether the efficiency of a production line can be improved if the line is unbalanced appropriately.

ISSN:0020-7543    

DOI:10.1080/00207548908942578

出版商:Taylor & Francis Group    

年代:1989

数据来源: Taylor