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오광석(K. S. Oh),김학구(H. K. Kim),이경수(K. S. Yi),고경은(K. E. Ko),김판영(P. Y. Kim),서자호(J. H. Seo) 유공압건설기계학회 2014 드라이브·컨트롤 Vol.11 No.2
This paper presents simulation-based analysis of energy flow of a wheel loader. The objective of this study is to analyze the energy flow of a wheel loader during driving and working. Because the wheel loader powertrain consists of a mechanical and hydraulic powertrain, the generated power from the engine is divided into 2 powertrains. Further, a virtual prediction of energy flow in the powertrains is a key factor in terms of optimal design. Accordingly, the simulation model that is able to predict the virtual energy flow is developed and analyzed in this study. The proposed wheel loader simulation model has been constructed in the Matlab/Simulink environment. It is expected that the developed simulation model will analyze the energy flow and efficiency in the design stage.
홍남표(Hong N. P),김병희(Kim B. H),권민호(Kwon M. H),주종남(Chu C. N),김보현(Kim B. H),김종균(Kim J. K),최광보(Choi K. B),이승용(Lee S. Y),김학구(Kim H. K) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.5
In this paper, novel submerged water journal & thrust bearings for a canned type electric water pump, which are crucial parts for the green cars development, has been developed. The canned type electric water, in which the cooling water is usually sealed by a can, is able to enhance fuel efficiency and reduce emission. Using analytical and numerical analyses, the journal and thrust bearings were designed and fabricated by sintering and machining of a SiC based bearing material. To improve the performance of the bearings, an in-house-level bearing testing system was developed and some preliminary wear tests are conducted for verifying the validity of the developed system.