摘要:

The problem of facilities design involves the assignment of facilities to available locations so as to minimize the total cost. When N new facilities are to be added to an existing layout, there are N! feasible ways in which the assignment can be completed. Presented in this paper is a simple method to calculate the mean and the standard deviation of the total costs for the N! feasible layouts. The method is also useful for analysing the distribution of the total cost for the general facilities design problem when n' out of N facilities have been assigned to suitable locations and n (i.e. N-n') facilities are left for assignment. These parameters are of importance to the facilities design engineer who is solving the problem by any construction algorithm where the layout is completed by successive addition of facilities to locations. At any stage when the location of the first (n'- 1) facilities have been decided, the possible effect of assigning the n'th. facility to the jth location can be predicted by estimating the mean and variance of the distribution of the total cost associated with the assignment.

ISSN:0020-7543    

DOI:10.1080/00207548408942447

出版商:Taylor & Francis Group    

年代:1984

数据来源: Taylor

摘要:

Presented in this paper is an heuristic algorithm to solve the problem of facilities design. As in other construction algorithms, facilities are picked up one by one and assigned to suitable locations. Facility i is assigned to location j by analysing the menu and the standard deviation of the total cost of all feasible layouts associated with the assignment. The location which minimizes the expected minimum assignment cost is selected for assigning a particular facility. Preliminary investigations have indicated the superiority of the proposed method over many of the existing techniques.

ISSN:0020-7543    

DOI:10.1080/00207548408942448

出版商:Taylor & Francis Group    

年代:1984

数据来源: Taylor

摘要:

Problems of workload imbalance in Group Technology (GT) can be mitigated by transferring workloads from a congested machine centre in one cell to an alternative, less congested machine centre in another cell. Such inter-cell workload transfer results in a GT system which is a hybrid between pure GT (in which components are. completely processed within a cell) and functional layout (FL) (in which components are routed from one department of similar machines to another until completely processed) Though inter-cell workload transfer is often used in practice, its effects on system performance in GT have not been evaluated. This paper describes a general purpose GT simulator which has been developed and the evaluation of workload transfer which has been carried out (Aug 1981). Various job and cell attributes are employed as criteria for initiating workload transfers and the results of such transfers are examined in terms of job satisfaction, scheduling effort and material handling as well as overall shop performance. The interacting effects of job allocation rules, priority dispatching rules and batch overlapping are investigated under varying degrees of deviation from ‘pure’ GT. The effects of changes in job mix and of increases in demand are also examined. So are the effects of unbalanced capacity and cell size. The implications of the results for the practical design and operation of GT systems are also discussed

ISSN:0020-7543    

DOI:10.1080/00207548408942449

出版商:Taylor & Francis Group    

年代:1984

数据来源: Taylor

摘要:

This paper presents an heuristic procedure for designing production lines with stochastic task times and multiple manning of work stations. The procedure is aimed at minimizing the total cost of the line; composed of facility layout costs, in-process inventory costs, labour cost and task incompletion cost.

ISSN:0020-7543    

DOI:10.1080/00207548408942450

出版商:Taylor & Francis Group    

年代:1984

数据来源: Taylor

摘要:

Milling experiments have been performed to investigate the dependence of surface finish s on cutting speed v feed f; and depth of cut d|Regression analyses were carried out for a nonlinear model and for a linear model obtained therefrom by logarithmic transformation. The good agreement between the two sets of solutions confirms the adequacy of the model and the linear solution values are therefore commended as suitable 'initial guesses’ for an iterative solution of the nonlinear case. In addition, small deviations of the 'controlled’ variables from values suitable for coding for a three-level factorial design were found not to be important. Finally, the dependence of surface finish on feed rate f was in fact so weak that the suppression of this parameter had little effect on the exponents of the other parameters. Overall the relationship could therefore be well represented by sα(v/d)15/4.

ISSN:0020-7543    

DOI:10.1080/00207548408942451

出版商:Taylor & Francis Group    

年代:1984

数据来源: Taylor

摘要:

The role of process planning in small-batch, discrete parts metal working industries and the impact of the computer in automating this important but tedious job are discussed. The nature, advantages, and limitations of the manual, variant, and generative approaches to process planning are presented along with a review of the progress to date for each approach. A major thrust of the paper is to discuss approaches and strategies for structuring manufacturing methods and data in decision logic formats applicable for developing generative type automated planning systems. Although no particular approach is promoted, the paper provides an overview and information useful for approaching the task of designing a generative type system. Some detailed discussion on part coding schemes and structuring decision logic for generative type planning systems is also presented. The paper concludes with a brief discussion of the future of computer-aided process planning and the role that micro-computers will play in that future.

ISSN:0020-7543    

DOI:10.1080/00207548408942452

出版商:Taylor & Francis Group    

年代:1984

数据来源: Taylor

摘要:

This paper shows how production engineering practice can be built into the software routines of CADCAM systems to aid the integration of design and manufacture. The paper describes aspects of a software package which has good production engineering practice built into it so that the good practice is standardized. The package has been developed to carry out the process planning of turned parts using as a starting point the component geometry entered into the CADCAM system. The package automatically plans the part for specified manufacturing facilities. The use of the package is thought to have considerable economic benefits.

ISSN:0020-7543    

DOI:10.1080/00207548408942453

出版商:Taylor & Francis Group    

年代:1984

数据来源: Taylor

摘要:

Accumulation of knowledge in and practical experience of simple flowlines and group technology flowlines indicates that no comprehensive classification of the alternative configurations is available. Those developed in the mass production context do not sufficiently reflect the possibilities in group systems, while those quoted in the group technology context tend to be superficial|This paper is aimed at overcoming this problem. It integrates all the varieties of flowlines into one classification scheme. It also suggests the materials flow system for each identified flowline in the scheme.

ISSN:0020-7543    

DOI:10.1080/00207548408942454

出版商:Taylor & Francis Group    

年代:1984

数据来源: Taylor

摘要:

Multistage production systems have been an important quest of researchers over many years. While much work has been reported in this area little appears to have been done when recycling, an inevitable factor in any production system, is present. In this paper, a model for optimal production batch quantity as well as optimal recycling lot size has been developed with a view to minimizing the total operational cost of such situations, where recycling takes place only from the last stage to the first. The model has been validated using sample data from a glassworks, located in Western India. The effects of changes of model parameters were also studied and practical guidelines arising out of the same have been provided.

ISSN:0020-7543    

DOI:10.1080/00207548408942455

出版商:Taylor & Francis Group    

年代:1984

数据来源: Taylor

摘要:

The SUMT algorithm of Fiaccoand McCormick (1968) is a powerful technique for the optimization of a multivariable, nonlinear function subject to both linear and nonlinear constraints. It has been used to solve optimization problems in many situations, but not very successfully in batch production problems. This is largely because, as with most algorithms using gradient search methods, SUMT does not cope very well with nonsmooth, discontinuous functions that are common in batch production. This paper reports on the modifications that have been made to ft class of batch production problems to permit the successful application of SUMT.

ISSN:0020-7543    

DOI:10.1080/00207548408942456

出版商:Taylor & Francis Group    

年代:1984

数据来源: Taylor