摘要:

Learning effects in the execution of repetitive tasks may often be adequately described by an exponential law commonly found in physical systems. This law is characterised by the rise time and the final value of output rate. An iterative method is developed for the determination of rise time and final value using only performance data recorded during early stages of learning, and is shown to predict these parameters sufficiently accurately for use in costing and in continuously updating lime standards. Further uses of the predictive technique include highlighting the need for increased supervision, or the replacement of particular operatives.

ISSN:0020-7543    

DOI:10.1080/00207547008929848

出版商:Taylor & Francis Group    

年代:1970

数据来源: Taylor

摘要:

A questionnaire was designed to give seven subjective degrees of monotony with other data concerning objective characteristics of the work. The questionnaire was used in plants with similar technology. It could be shown that the criterion of duration of the operation itself is not sufficient for classification of degrees of monotony. It is necessary to add data concerning the structure of operation. Non-technical and organisational factors in production—age, length of time on job, etc.—can affect the degree of monotony, but are not of primary importance. The paper also deals with the subjective aspects of monotony and the opportunity for the employee to change operations.

ISSN:0020-7543    

DOI:10.1080/00207547008929849

出版商:Taylor & Francis Group    

年代:1970

数据来源: Taylor

摘要:

A mathematical hydrodynamic model of hydrostatic extrusion with variable lubricant thickness is formulated. A set of values has been calculated and presented in graphical form. Optimum die angle is calculated. This model is compared with the corresponding hydro-dynamic model having constant lubricant thickness.

ISSN:0020-7543    

DOI:10.1080/00207547008929850

出版商:Taylor & Francis Group    

年代:1970

数据来源: Taylor

摘要:

A model of chip formation and an indentation model are constructed for the chisel edge region of a twist drill. From these models, predictions are made as to the shape of the wear zone about the chisel edge and equations derived for calculating the torque and thrust developed by the chisel edge given the geometry of the drill point, the cutting conditions and a shear stress factor for the work material.

ISSN:0020-7543    

DOI:10.1080/00207547008929851

出版商:Taylor & Francis Group    

年代:1970

数据来源: Taylor

摘要:

Experiments are described in which cylindrical aluminium and copper billets were fired from an industrial stud-driving gun into closed die sets of a variety of cavity forms. Where the forming process commenced with a piercing operation, as in the production of conical or tubular components, the effect of piercer radius upon the flow of billet material was investigated. It is shown how a tendency to rupture during “hoop” expansion of the billet material may be suppressed by elimination of hoop tensile stresses, either by using slightly converging die walls, or by constraining the material to move along a curved path so that heavy inertia stresses are developed in the “thickness” direction.

ISSN:0020-7543    

DOI:10.1080/00207547008929852

出版商:Taylor & Francis Group    

年代:1970

数据来源: Taylor

摘要:

The purpose of this paper has been to present and exemplify a new and alternate method of return assessment. The method does have computational and mathematical advantage. It is also believed to have analytic advantage in that it is less susceptible to manipulation by base selection and more closely associated with performance measures which are relatively well defined.

ISSN:0020-7543    

DOI:10.1080/00207547008929853

出版商:Taylor & Francis Group    

年代:1970

数据来源: Taylor

摘要:

A novel idea for the development of statistical sampling plans is presented. The salient feature of this inspection plan is that rejection of lots cannot take place, yet the consumer is indifferent to lot quality. Simple examples are discussed. Advantages and disadvantages of this type plan are suggested.

ISSN:0020-7543    

DOI:10.1080/00207547008929854

出版商:Taylor & Francis Group    

年代:1970

数据来源: Taylor

摘要:

Dependent stage acceptance sampling is a plan where the probability of acceptance of each lot is dependent on the probability of acceptance of all prior lots submitted. It is intended as a simplified supplement to existing two-stage sampling plans. The general concept and properties of the technique are explained and it is compared with chain sampling plans.

ISSN:0020-7543    

DOI:10.1080/00207547008929855

出版商:Taylor & Francis Group    

年代:1970

数据来源: Taylor

摘要:

A comparative study of machine and labour utilisation, undertaken in West Midlands engineering and rnetalworking industries, was initiated because United Kingdom Census of Production statistics indicate that labour productivity in that region was lower than the national average. This study, involving 273,000 snap readings, revealed that productivity could be increased by as much as 100 per cent, but led to an examination of productivity measures which showed that there was no real evidence that productivity in the region was lower than that of other regions.

ISSN:0020-7543    

DOI:10.1080/00207547008929856

出版商:Taylor & Francis Group    

年代:1970

数据来源: Taylor