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이용덕,이재헌,김광식,Lee, Y.D.,Lee, Jae-Heon,Kim, K S. 대한설비공학회 1992 설비공학 논문집 Vol.4 No.3
Temperature distributions in a 3.5 inch hard disk drive including disk surface and internal air have been simulated numerically. Solutions were obtained from fifteen cases regarding three power consumption rates and five ambient conditions. As a result, the velocity of cooling air should be maintained greater than ㏐/s when the power consumption reached 3W in the disk drive. A correlation equation was proposed to predict the temperature field of disk surface and caseing surface.
이용덕(Y. D. Lee),차용훈(Y. H. Cha),김기풍(K. P. Kim) 한국소성가공학회 2009 한국소성가공학회 학술대회 논문집 Vol.2009 No.10
This study is performed to investigate shearing characteristics for vibration damping sheet metals which are bonded with dissimilar sheet metals. A shearing tool set is designed and manufactured and shearing tests with the tool set are conducted at varying the magnitude of clearance in order to analyze the shearing characteristics. The shearing characteristics are analyzed for burr height and shape of sheared faces with respect to the magnitude of clearance between the punch and the die. The shearing test results demonstrate that optimum clearance is 8~12% of the sheet thickness at the shearing of the vibration damping sheet metals and the shearing direction has to controlled deriving occurrence of the burr at the thick sheet of the vibration damping sheet metals.
예측수정된 Stanitz 방정식을 이용한 임펠러 출구 조건 해석
정진희(J. Jeong),김춘동(C.D. Kim),이현구(H.K. Lee),이용덕(Y.D. Lee) 한국유체기계학회 1999 유체기계 연구개발 발표회 논문집 Vol.- No.-
We have measured pressure distributions within the diffuser and pressures at the inlet and outlet of the compressor in orde to match impeller and low-solidity diffuser of 500RT centrifugal refrigerant-compressor which has been developed in LG Cable Ltd. Modified Stanitz equation is used to predict the measured data by tuning several parameters and then is validated. Using the validated parameters and modified Stanitz equation, we have obtained data necessary to design the diffuser.