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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
Editor in Chief :
Volume & Issues
Volume 17, Issue 5 - Oct 1993
Volume 17, Issue 4 - Aug 1993
Volume 17, Issue 3 - Jun 1993
Volume 17, Issue 2 - Apr 1993
Volume 17, Issue 1 - Feb 1993
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A Note on the Propeller Rotational Speed Increase due to the Propeller Blade Edge Modification
Journal of the Korean Society of Marine Engineering, volume 17, issue 2, 1993, Pages 1~8
The cases and the treatments of the rotational speed losses of marine propellers are examined and practical modification methods are discussed. The cutting of the propeller diameter, the modification of propeller pitch and the propeller blade edge modification are briefly reviewed. An example for the propeller blade edge modification, which is regarded to have advantages in cost and workmanship, is presented for a propeller of a large ship.
A Study on the Estimation of the Load Torque in a Diesel Engine
Journal of the Korean Society of Marine Engineering, volume 17, issue 2, 1993, Pages 29~35
Recent marine propulsion diesel engines tend to become slower in speed and longer in stroke for the higher engine efficiency, and in these long stroke and slow speed engines the digital governors are highly recommended to be used. But, in the present digital governors only the feedback of the engine rpm-signal is used for the engine speed control. If the load torque of the engine can be measured or estimated and the torque feedback loop is added to the present digital governor, it is expected that the speed control performance of the digital governor will be highly improved. In this paper, a new method is proposed to estimate the load torque of the diesel engine from the measured signals of fuel oil and rpm. And it is also suggested that the Kalman filter can be used for the estimation of engine torque.
A Study on the Real Quality and Void Fraction of Subcooled Refrigerant Flow
Journal of the Korean Society of Marine Engineering, volume 17, issue 2, 1993, Pages 36~43
Real quality and axial void fraction distribution of subcooled refrigerant flow is very important to predict the heat transfer rate and pressure drop in the design of refrigerating system. In the subcooled boiling region, the liquid bulk temperature is still below the corresponding saturation temperature. But beyond the net vapor generation point, bubble detachment is occured actively from the vapor layer formed on the wall. A reliable method to predict the vapor fraction from the liquid bulk temperature is suggested in this paper. And also the actual quality of the subcooled R-113 flow is calculated in the range of 261-1239kg/
s mass velocity and 10-30K subcooling.
A Study on the Application of Vortex Panel Method to 2 - D Turbo - machinery
Journal of the Korean Society of Marine Engineering, volume 17, issue 2, 1993, Pages 44~51
Here is represented a vortex panel method to evaluate the performance characteristics of the 2-dimensional turbomachinery with circular arc blades or logarithmic blades. The present method is characterized by distributing small consecutive panels of linearly varing vortex strength satisfying boundary condition at control points and Kutta condition at trailing edge. To confirm the reliability of the present method, experimental result of a 2-D pump impeller of six circular arc blades is compared with the calculated one. As an application of the present method, figures are presented in series showing velocity and pressure distribution between blades.
The Influence of Water Environment on the Mechanical Properties of Carbon/Epoxy Reinforced Composite Materials
Journal of the Korean Society of Marine Engineering, volume 17, issue 2, 1993, Pages 52~59
This study is investigated of tensile and fatigue strength for advanced composite materials under hygrothermal environment. The materials used are two types of Carbon/Epoxy reinforced composite materials i.e., 13
cure-type composite T-1/347, and 18
cure-type MM-1/982X. These are composed by cross-ply laminates. Test condition is the distilled water of 8
. The separate absorption contents estimated by the Fick's diffusion rule are similar to the experiment results. The tensile strength of T-1/347 wet specimens more increased than that of dry ones, but that of MM-1/982X decreased. The fatigue strengthes of both T-1/347 and MM-1/982X wet specimen more decreased than those of dry specimens.