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Radio and Electronic Engineer

Issue 6 • Date December 1967

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Displaying Results 1 - 8 of 8
  • What is engineering?

    Publication Year: 1967
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (115 KB)  

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  • Coefficient plane synthesis of zero velocity lag servomechanisms

    Publication Year: 1967 , Page(s): 323 - 334
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    The basic coefficient plane technique is extended to cover the synthesis of zero velocity lag servomechanisms, thus offering the facility of a rapid and exact design philosophy for this class of feedback control systems. An important application of the technique to the direct evaluation of sensitivity of system performance to changes in load dynamics is discussed in detail. Because certain standard compensation methods result in a high, rather than infinite, velocity constant, a brief study has been made to determine the allowable drift of the system zero such that the performance criteria of interest are not significantly affected. For the type of servo-mechanism studied, it is concluded that the order of drift met in practice when using these compensation methods is not normally sufficient to invalidate the use of the coefficient plane technique at the synthesis stage. View full abstract»

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  • Quality failure cost analysis

    Publication Year: 1967 , Page(s): 335 - 344
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (837 KB)  

    Faults occur during the assembly of apparatus, as a result of weakness of design, faulty materials, errors in process methods, and human mistakes. Each fault costs money to repair, the cost appearing in the final price of the product. A method of organizing production/inspection, fault information analysis, and costing to discover and control the quality failure costs arising during assembly of television receivers is given. Detailed information, not only of the reject percentages, but also of the related costs resulting from faults occurring during manufacture, is produced and made available to designers, production engineers, suppliers, and factory management. The main causes are located and permissible expenditure to produce an improvement in quality and reliability without increasing the price is derived. Experience shows that there is a correlation between assembly failures in the factory and service costs in the field. View full abstract»

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  • A review of electro-optic beam deflection techniques

    Publication Year: 1967 , Page(s): 345 - 352
    Cited by:  Papers (3)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (939 KB)  

    Electro-optic beam deflectors are of two basic types. The digital beam deflector produces a range of quantized beam output positions by the use of an assembly of electro-optic polarization switches coupled through birefringent elements. The analogue light deflector produces continuously variable range of beam output positions by electro-optic variation of the refractive index of a deflecting element. In each case the number of resolvable output positions is determined by the diffraction angle of the light beam, the amount of background light generated, and the aberrations of the system. Electro-optic beam deflectors may in future be applied to data reading and storage in computers, as well as in information displays, optical printers, and in multiple switching arrays. Using the electro-optic materials at present available, the maximum number of resolvable output positions in a two-dimensional deflector system is of the order of 106/cm2. Limitations of switching speed arise through power dissipation in the electro-optic material and the large reactive energy storage in the switches. However, using existing materials and those which should be available in the near future, switching speeds in excess of 106 random addresses per second should be possible in deflectors of this capacity. View full abstract»

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  • Shadow mask picture tube convergence techniques

    Publication Year: 1967 , Page(s): 353 - 367
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    The problems of shadow mask display tube convergence are described for both triangular and in-line configuration of the three beams and various solutions to these problems are discussed. The merits of various circuits are compared and the adjustment procedure is outlined. View full abstract»

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  • Design for production

    Publication Year: 1967 , Page(s): 369 - 383
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    This paper underlines the designer's personal responsibility for his design, and the need for him to establish a good working relationship with many experts. It suggests that modern electronic design is dominated by complex production processes and integrated assemblies, and reviews the implications of this on the design task. It urges the designer to become familiar with the engineering implications of elemental assembly operations, and tailor his design to suit the particular degree of automation existing in his factory. The integrated nature of equipment assembly and testing is considered and a distinction specifically made between design proving and production testing. Some factors affecting the length of time taken for design are discussed, and the specification of Quality is considered. Production training policy for designers is outlined and the need to integrate design and production engineering is emphasized. The various aspects of a designer's Code of Practice for the part of his task that is concerned with production are brought out in the course of the paper and summarized in Appendix 2. View full abstract»

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  • The acoustic target strength of fish

    Publication Year: 1967
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  • Reply: The acoustic target strength of fish

    Publication Year: 1967
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