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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korean Society of Marine Engineering
Journal Basic Information
Journal DOI :
Korean Society of Marine Engineers
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Volume & Issues
Volume 6, Issue 2 - Apr 1982
Volume 6, Issue 1 - Feb 1982
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A Study on Current and Torque Characteristics Of Three-Phase Induction Motor in Single-Phase Operation.
Journal of the Korean Society of Marine Engineering, volume 6, issue 1, 1982, Pages 25~33
The characteristics of the stator current and torque of a small three- phase squirrel cage induction motor and studied experimentally under the situation of a single-phase operation due to various causes. Through the experiments, the torque-slip and current-slip curve of single-phase circuit as well as three-phase circuit are obtained and the needed constants are determined. The stator current and torque are calculated by the current and torque equations derived by the unbalanced circuit theory. The numerical values obtained from the above methods are compared with the experimental values under the same conditions. The results of the study are summerized as follow; 1) The values computed by the unbalanced circuit theory generally come to approach the values recorded through experiments. 2) Near the rated load, speed drop is less than 1.2 per cent of the speed of three-phase induction motor and torque reduces less than 3 per cent of it of three-phase induction motor when three-phase induction motor is run under a single-phase. On the other hand, the stator current in a single-phase circuit is more than 1.9 times of it in three-phase circuit. 3) The stalling torque in a single-phase circuit is reduced to about 41 per cent of it in three-phase circuit while the corresponding slip is moved toward the synchroneous speed and the corresponding stator current is increased.
A Study on the Calculation Formulae of Required Air and Burning Gas Amount of Heavy Fuel Oil
Journal of the Korean Society of Marine Engineering, volume 6, issue 1, 1982, Pages 34~40
The characteristics of typical 17 kinds of fuel oils are studied to fine the calculation formulae for the required amount of air and the combustion gas amount. 1) The author's calculation formulae are as follows; (1) Theoretically required amount of air (2) Theoretical amount of combustion gas 2) Theoretical amount of the required air in combustion and combustion gas of fuel oils are always estimated less with Rosin's formula than with author's one. 3) Theoretical amount of the required air and the amount of combustion gas of fuel oils are more reasonable with author's formula than Rosin's one in comparison with results of actual analysis.
A Study on the Finite Element Analysis of J-Integral
Journal of the Korean Society of Marine Engineering, volume 6, issue 1, 1982, Pages 41~48
One of the important subjects in fracture mechanics study is to analyze the stress intensity factor. In this paper, the stress intensity factor in Mode I (
) is determined by J-integral using the finite element method. In this investigation, the values of
are computed for distorted and undistorted elements of 8-noded isoparametric finite elements. The numerical results obtained are summarized as follows. (1) Through a relatively coarse mesh, the
values obtained by this method are fairly good accuracy. (2) The
values for the distorted elements appear to be better than those obtained using the undistorted mesh. (3) Within the limits of these analyses, the solutions obtained through the integral paths in the medium region of elements approach to the analytical solution most closely.
A Study on the Temperature Accuracy due to Conditions of Thermocouple Installation
Journal of the Korean Society of Marine Engineering, volume 6, issue 1, 1982, Pages 49~54
In the equipments of industrial plant and marine engine, an exact temperature measurement is indispensable. Temperature measurement errors are induced by electrical and heat errors, and the insufficient immersion length of thermowell exerts an important effect to the haet error. In this paper, the author analyses the relation between temperature errors and the rate of immersion length to outside diameter (L/D) in order to reduce the heat errors.