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동하중을 받는 박용 디젤 엔진의 저널 베어링 윤활특성에 관한 연구
차지협(Ji-Hyoub Cha),이상수(Sang-Su Lee),김정렬(Jeong-Ryul Kim),길병래(Byoung-Rae Kil) 한국마린엔지니어링학회 2003 한국마린엔지니어링학회 학술대회 논문집 Vol.2003 No.-
This study presents an analysis of eccentricity ratio of dynamically loaded-journal bearing using mobility method. Computational calculation has been done by using solution of Ocvirk and Goenka's curve fit. And we investigate influences of design parameters on bearing load and eccentricity ratio.(maximum film pressure, min. oil film thickness, and radial clearance) and calculate the absolute viscosity of oil film with the relation of pressure-viscosity and temperature-viscosity. The results show that we must consider variation of temperature and pressure on the analysis of oil film lubrication.
가변피치프로펠러의 칼라형과 트러니언형 허브의 비교 연구
김기인(Ki-In Kim),송기주(Ki-Ju Song),전동춘(Dong-Chun Jeon),강선이(Sun-Yi Kang),김정렬(Jeong-Ryul Kim),차지협(Ji-Hyoub Cha) 한국마린엔지니어링학회 2009 한국마린엔지니어링학회 학술대회 논문집 Vol.2009 No.-
There are two kinds of hub mechanism on the controllable pitch propeller. One is the collar type and the other is the trunnion type. Pitch variation mechanism of the collar type of CPP is a simpler and cheaper solution, therefore CPP of this type is more applicable for commercial vessels. But the trunnion type of CPP has many advantages compared to the collar type of CPP : There are an ability to install up to 7 blades and a smaller dependency from bolt properties. The blades arrangement of trunnion type does not need bolts and it has a smaller disk factors for the same number of blades compared with the collar type CPP. In this instance, the CPP of trunnion type is an appropriate fit for the naval purposes(explosive shock) and ice breakers.