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김종억(J.E.Kim),김용섭(Y.S.Kim) 한국자동차공학회 1984 오토저널 Vol.6 No.1
We appleis Molecular Dynamics simulation technics to a system of Lennard-Jones potential interacting Argon liquid to study shear flow behavior . <br/> The thermodynamic state of the system is ρ=35.54 Kgㆍmole/㎥,<br/> T=86.5˚K which is the triple point of Argon liquid. We applies shear rate :ε=9.26×10˚1/sec in the system. <br/> We find the response function shear viscosity changes, and shear rate build-up as a func-tion lf tine. We also find the thermal conductivity in a soft-sphere system.
과다 예압을 받는 테이퍼롤러 베어링의 수명단축효과에 대한 실험적 연구
박종원(J. W. Park),김형의(H. E. Kim),김종억(J. E. Kim),심양진(Y. J. Sim),정원욱(W. U. Jung) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11
Tapered roller bearings are core component for rotating machine that endure axial and radial load simultaneously. Especially tapered roller bearings used for input and output shaft of transmission the life shortening effect as excessive axial pre-load, which can be occurred in assembly line of transmission, was frequently reported in that case. In this study, we derived the equation for the life of tapered roller bearing in case of excessive pre-load by accelerated life test. DOE method and FEA was used for designing the accelerated life test condition. The derived life equation of tapered roller bearing calculated longer life than the exited L₁? bearing life equation. Because we analyzed the accelerated life test results with Weibull distribution. The result of this study will be helpful to predict the life of tapered roller bearing in case of excessive pre-load and design that kind of rotating machines.