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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of the Korean Society of Marine Engineering
Journal Basic Information
Journal DOI :
Korean Society of Marine Engineers
Editor in Chief :
Volume & Issues
Volume 10, Issue 4 - Aug 1986
Volume 10, Issue 3 - Jun 1986
Volume 10, Issue 2 - Apr 1986
Volume 10, Issue 1 - Feb 1986
Selecting the target year
Displacement transducer technique for bearing health monitoring
Kim, P.Y. ;
Journal of the Korean Society of Marine Engineering, volume 10, issue 3, 1986, Pages 1~10
This paper describes a new, effective method developed at the National Research Council Canada for rolling element bearing incipient failure detection. This method can detect not only outer race damage, previously published, but also inner race damage with a 100% detection rate based on a sample size of 32. The prediction of the exact angular location of the damage spot along the raceway is illustrated and experimental confirmation is presented. For the first time, a statically measurable parameter for inner and outer race damage is introduced as a means of verifying other techniques which do not offer absolute proof, but resort only to "overwhelming evidence". A brief comparison with other methods such as Shock Pulse Method, Kurtosis Analysis and High Frequency Resonance Technique is presented. A computerized automatic monitoring system utilizing the new method is described and experimental results are presented.presented.
The present status of study on the behaviour of the line shafting
Hylarides, S. ; Jeon, Hyo-Jung ;
Journal of the Korean Society of Marine Engineering, volume 10, issue 3, 1986, Pages 11~38
Past and present developments in the alignment procedures of the line shafting are discussed. It is shown that the effects of the propeller hydrodynamics and of the oil-films, built up in the journal bearings, can essentially change the static alignment. However, the inclusion of these phenomena in the alignment is not yet standard. Also the dynamic effects of natural frequencies and vibratory excitations are not yet accounted for in the general case, although also these aspects can influence the safe operation of the line shafting. Therefore a plea is made to develop a more complete and thus a more rational alignment procedure.
A theoretical investigation of misfiring effects on the crankshaft torsional vibration of diesel engine
Journal of the Korean Society of Marine Engineering, volume 10, issue 3, 1986, Pages 94~106
Since the oil shock of '70s the engine makers have developed new types of diesel engine with low fuel consumption. There is an obvious tendency towards the use of poorer quality fuels, such as the residual oil from chemical processes of refinery. The shaft driving generators is also widely adopted on behalf of the auxiliary diesel engines, which are driving on the expensive diesel oil and have high fuel oil consumption rates, and some mania propulsion diesel engines are equipped with reduction gear systems to get better propulsive efficiency by slower propeller revolutions. The propulsion shafting system equipped with the shaft driving generator or the geared diesel engine shafting system has flexible couplings, and it requires extensive investigations of the torsional vibration and torque fluctuation in order to ensure the acceptable operation range in service. The characteristics of misfiring must be especially examined for the high viscosity fuels to be used. Both torsional vibration and fluctuating torque resulted from misfiring, should be examined for thier effects on the flexible coupling and propulsion shafting system. This paper is to investigate and solve the above mentioned problems which must be predicted on the design-stage of marine propulsion shafting system. A computer program is developed to calculate the indicated diagram, fluctating torque and torsional vibration for both normal and misfiring conditions.
A study on the development of liquefied natural gas-fired combustor
Journal of the Korean Society of Marine Engineering, volume 10, issue 3, 1986, Pages 107~118
The presenet research attempts to examine the combustion characteristics and the structure of the flame in turbulent premixed flames and thus enhance the combustion performance that leads to the design of the effective combustion system (untilizing LNG). Following experimental investigations for several stabilized premixed flames were attempted to identify the interactive mechanism between flame structures and flow fields; Visualization by Schlieren method, measurement of flow velocity by LDV, detection of ion current by ion probe, measurement of fluctuating temperature by thermocouple having compensation circuit, average values with respect to time of fluctuating amount for flow velocity, temperature, ion current, etc., variable RMS values, PDFs, autocorrelation, crosscorrelation, spatial macroscale, power spectra, and velocity scale. Continuing the authors published studies whose flame dominated by coherent structures and the characteristics of combustion reaction for irregular three dimensional flame and stabilized flame by step were investigated with obtained experimental quantities. Results of this research are following : The most turbulent flames support the structure of a Wrinkled laminar flame or laminar flamelets. It also observed that combustion reaction is related to small tubulence microscales of the turbulent flow fields closly.
One-dimensional Kalman filter for estimating target position
Journal of the Korean Society of Marine Engineering, volume 10, issue 3, 1986, Pages 119~125
By using the least square input estimator and a likelihood ratio technique, an one-dimensional tracking problem is presented. A Kalman tracking filter based on constant-velocity model is used to track a target and the filtered estimate is updated with an input estimate when a maneuver is detected. The simulation results show that there are significant improvements using the scheme presented here.