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Transactions of the American Institute of Electrical Engineers, Part II: Applications and Industry

Issue 6 • Date Jan. 1955

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Displaying Results 1 - 25 of 31
  • Induction heating steel with 60 cycles

    Publication Year: 1955, Page(s):353 - 357
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (397 KB)

    A NEW field for the application of induction heating has developed. High-frequency heating of metal is already accepted as an indispensable tool of industry for surface heating and for through-heating small pieces. The steel industry is now turning its attention to lower frequencies for heating large sections to forging temperatures, approximately 2200 degrees Fahrenheit (F). The heating of steel ... View full abstract»

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  • Carbon-pile regulator theory: Calibration, adjustment, and factors affecting its operation

    Publication Year: 1955, Page(s):357 - 363
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (624 KB)

    FOR many years during the initial use of the carbon-pile regulator for control of aircraft generator systems, the adjustment of the regulator was considered to be extremely difficult. This is no longer true. Because of the instability of early regulator designs, there was no attempt to adjust the regulator at its theoretically optimum adjustment point. This was brought out in previous papers1¿3 o... View full abstract»

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  • High altitude aircraft inverters

    Publication Year: 1955, Page(s):363 - 372
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (634 KB)

    OF ALL rotating electric aircraft equipment, the inverter is probably one of the most difficult and most interesting items. A semi-independent power conversion unit, it presents a combination of design problems inherent to its components, together with additional ones, such as special vibration, ventilation, starting, and regulation problems. Some of the inherent problems are partially eased by it... View full abstract»

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  • A magnetic tape memory for D-C positional servomechanisms

    Publication Year: 1955, Page(s):372 - 374
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (283 KB)

    A method of storing positional data on magnetic tape has been devised and this method employed in a memory unit for a d-c positional servomechanism. A dual track tape and a time modulation encoding scheme are the distinguishing features of this method. View full abstract»

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  • Magnetic amplifier control of radio-frequency generators

    Publication Year: 1955, Page(s):374 - 378
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (406 KB)

    RADIO-frequency (r-f) generators are used in various industrial processes such as soldering, hardening, forging, annealing, etc. The r-f portion of the generator is usually an oscillator comprising one or more large vacuum tubes, a tank circuit, and an inductive coupling or ¿work¿ coil. To utilize vacuum-tube capabilities most fully, high voltage is supplied to the tube plates through a rectifie... View full abstract»

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  • Reliability improvement ¿¿ A plan to achieve and measure reliability of aircraft equipment

    Publication Year: 1955, Page(s):378 - 383
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (385 KB)

    ALL procurements and procurement specifications are made with an attempt to obtain equipments that are reliable. The present, classical method of attempting to achieve this is to require that the equipment operate satisfactorily when exposed to a level of environmental stress called for in the governing specification. Usually, these environmental conditions are applied singly, and all are not nece... View full abstract»

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  • Phase-plane analysis of automatic control systems with nonlinear gain elements

    Publication Year: 1955, Page(s):383 - 390
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (591 KB)

    This paper develops a unified method of transient analysis of second-order feedback control systems having nonlinear gain components and subjected to step or ramp inputs. Essentially, the technique is a decomposition of the phase plane into linear regions within which trajectories converge to corresponding critical points. Application of the method to several typical problems previously analyzed b... View full abstract»

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  • The nature of voltage ripple on D-C generators

    Publication Year: 1955, Page(s):390 - 393
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (379 KB)

    THE output voltage of a d-c generator contains an a-c component which is superimposed upon the d-c output of the generator. This voltage component, or voltage ripple, may be less than 1 per cent of the output voltage or may have peaks as high as 10 per cent of the d-c output, depending upon the design and condition of the generator. For many applications of d-c power the voltage ripple is of no co... View full abstract»

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  • Jitter in instrument servos

    Publication Year: 1955, Page(s):393 - 398
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (431 KB)

    Jitter in electromechanical instrument servos is studied analytically and by analogue-computer simulation. The study identifies some unreported causes of jitter, identifies the jitter-causing nonlinearities that can be eliminated, establishes relations between the unavoidable nonlinearities that will eliminate jitter, and expresses the effects of granular or quantizing elements mathematically and ... View full abstract»

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  • Aircraft tachometer indicator ¿¿ An analysis of design factors affecting starting performance

    Publication Year: 1955, Page(s):398 - 403
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (490 KB)

    FIFTY years of powered flight have brought changes to aircraft controls. A pilot cannot properly control the flight of today's powerful machines without the use of instruments. Many of the newer instruments and control devices embody electronic elements for sensitivity and speed of response. Some have servo-system operation for highest accuracy. One of the oldest instruments, the engine speed indi... View full abstract»

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  • Additions to z-transformation theory for sampled-data systems

    Publication Year: 1955, Page(s):403 - 408
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (398 KB)

    THERE is one important class of feedback control systems which until recently has received but limited attention. The systems in this class are known as sampled-data systems. The distinguishing feature of this class of systems is that at one or more points in the system, signal information has the form of a train of pulses. View full abstract»

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  • Aircraft windshields heated by means of transparent conductive films

    Publication Year: 1955, Page(s):408 - 416
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (568 KB)

    THE safe flight of an airplane depends upon good pilot visibility. Many methods of maintaining clear vision through transparent areas have been used by aircraft manufacturers and operators during the past 10 years, but the development of a transparent conductive film which can be applied to a glass surface promises to offer an ultimate solution to this problem. By means of the transparent conducti... View full abstract»

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  • The Toronto subway

    Publication Year: 1955, Page(s):416 - 420
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (542 KB)

    IN TORONTO, Canada, the last street car and trailer line on the Continent has been replaced by a modern subway system thoroughly integrated with surface transfer lines. Since cars, shops, and track were entirely new, all of the modern features and methods of other systems were studied and adopted where practical. The cars, as well as signals and part of the power supply, telephone system, and cabl... View full abstract»

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  • Overvoltage detection in single and multigenerator aircraft A-C systems

    Publication Year: 1955, Page(s):420 - 425
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (445 KB)

    OVERVOLTAGES resulting from fault conditions in aircraft a-c electric systems being designed at present can cause extensive utilization equipment damage. Until such time as aircraft power generating and regulating equipment design results in reduced overvoltage possibilities, it is likely that an overvoltage control relay will be installed in many single-generator systems. View full abstract»

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  • Calculations on voltage unbalance for 3-phase synchronous systems

    Publication Year: 1955, Page(s):426 - 437
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (695 KB)

    THE steady-state behavior in regulated systems which become unbalanced has been treated in an earlier paper.1 The treatment there was concerned principally with fault-type unbalances, though general unbalance was considered and amplified with an example. A need was felt for an extension in the direction of further quantitative evaluation of the degree of unbalance in voltage experienced as a funct... View full abstract»

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  • Current distribution in paired-phase bus bars under unbalanced load conditions

    Publication Year: 1955, Page(s):438 - 443
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (704 KB)

    THE operating characteristics of feeder systems for the distribution of large polyphase currents at low voltage are usually given on the basis of performance when conducting balanced steady-state currents. Voltage drops and temperature rise are measured, and impedance calculated, from simple tests involving the passage of balanced polyphase currents through one or more sections of the feeder duct ... View full abstract»

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  • Correlation of rating data for rotating electric machinery

    Publication Year: 1955, Page(s):443 - 452
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (771 KB)

    THE variety and extremes of environmental conditions to which electric equipment is subjected in military aircraft in connection with the stringent performance, weight, and space requirements make it mandatory that the environmental factors be properly considered in the application of this equipment. The major effect of the environment is that of cooling which has become a problem area in high-spe... View full abstract»

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  • Maintenance testing of insulation resistance on Diesel-electric locomotives

    Publication Year: 1955, Page(s):452 - 455
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (315 KB)

    THE Diesel-electric locomotive has been made possible to a large extent by the electric system which so efficiently controls and transmits to the driving wheels and auxiliaries the concentrated horsepower of our modern Diesel engines. This electric system, consisting of generators, motors, switches, relays, meters, resistors, and thousands of feet of wire, depends primarily for its satisfactory op... View full abstract»

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  • Ten years of progress in predicting the aerodynamic, thermodynamic, and output characteristics of blast-cooled aircraft generators

    Publication Year: 1955, Page(s):455 - 461
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (537 KB)

    THE output of electric apparatus is limited usually by maximum allowable temperatures. If electromagnetic and other design factors permit, the output can be increased by applying additional cooling. This increased cooling principle permits greater output per pound of electric apparatus and has been applied to aircraft generators for a number of years to increase electric system capacity and reduce... View full abstract»

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  • Operating experience in Diesel-electric locomotives results in design changes

    Publication Year: 1955, Page(s):461 - 463
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (241 KB)

    THERE is no question regarding the soundness of engineering employed during the design and construction of Diesel-electric locomotives, but many of the refinements follow as a result of the experiences gained by the various railroads operating them. This power plant on wheels was intended to out perform a steam locomotive and it will, but there was a day when it would not. The iron horse was littl... View full abstract»

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  • A weight analysis of modern aircraft electric systems

    Publication Year: 1955, Page(s):463 - 469
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (557 KB)

    THE problem of choosing suitable electric systems for aircraft has been the subject of investigation and discussion for many years. To meet general or specialized requirements, the aircraft industry has had to choose between primary a-c and d-c systems. The magnitude of system voltage has been a variable. For the a-c system, a choice must be made between variable and constant frequency, and for th... View full abstract»

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  • Experimental determination of 400-cycle impedance of wire in aircraft power distribution circuits

    Publication Year: 1955, Page(s):469 - 478
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (855 KB)

    THE measurement of impedance of power distribution circuits is a continuing problem as long as materials, installation methods, and ultimate use of such circuits are constantly undergoing changes. In contrast to transmission lines, power distribution circuits are relatively short and operate at utilization voltages. This simplifies the impedance measuring problem because the effects of capacitance... View full abstract»

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  • Diesel-electric locomotive wheel slipping; causes, effects, and methods of control

    Publication Year: 1955, Page(s):478 - 480
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (240 KB)

    WHEEL slipping is a serious problem in Diesel-electric locomotives. At best, it results in loss of tractive effort which is the locomotive's only reason for existence. On the other hand, slipping can result in mild to extensive damage to traction motors, rails, and main generators. The Diesel-electric locomotive has an electric transmission capable of converting the constant horsepower output of a... View full abstract»

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  • The maximum response ratio of linear systems

    Publication Year: 1955, Page(s):480 - 484
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (405 KB)

    EXCEPT in cases where pure undamped resonances occur, stable linear transmission or filter systems are characterized by bounded response to every bounded input. What is the maximum response amplitude that can be obtained in a linear, time-invariant system subjected to inputs having limited amplitudes? This question may be stated in another way. To what level must the input to a system be limited t... View full abstract»

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  • Accurate control of relative speed and cut in a continuous process line

    Publication Year: 1955, Page(s):485 - 493
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (939 KB)

    Magnetic amplifier controls one d-c generator to drive a group of d-c motors to process wallboard and plasterboard. Co-ordination of belt speeds to a small fraction of 1 per-cent uses differential control synchro. Rotating knife synchronism is held by synchro-metering device. View full abstract»

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Aims & Scope

This Transaction ceased production in 1963. The current retitled publication is IEEE Transactions on Industry Applications.

Full Aims & Scope