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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korean Society of Tribologists and Lubrication Engineers
Journal Basic Information
Journal DOI :
The Korean Society of Tribologists and Lubrication Engineers
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Volume & Issues
Volume 10, Issue 4 - Dec 1994
Volume 10, Issue 3 - Sep 1994
Volume 10, Issue 2 - Jun 1994
Volume 10, Issue 1 - Mar 1994
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접촉 저항법을 응용한 트라이볼로지 문제점의 해석
Journal of the Korean Society of Tribologists and Lubrication Engineers, volume 10, issue 2, 1994, Pages 1~4
엔진 마모 및 손상의 원인과 처방
Journal of the Korean Society of Tribologists and Lubrication Engineers, volume 10, issue 2, 1994, Pages 5~19
Journal of the Korean Society of Tribologists and Lubrication Engineers, volume 10, issue 2, 1994, Pages 20~29
A Study on the THD Performance of a Large Tilting Pad Journal Bearing Including the Inlet Pressure Effect
Journal of the Korean Society of Tribologists and Lubrication Engineers, volume 10, issue 2, 1994, Pages 30~38
The thermohydrodynamic(THD) performance of a large tilting pad journal bearing is investigated both theoretically and experimentally. The theory takes into account the three dimensional variation of lubricant viscosity and eddy viscosity, and the inlet pressure. Owing to the inlet pressure effect, the film pressure and load capacity are increased but the mixing temperature and bearing surface temperature are decreased. The continuous distribution of the film pressure and film thickness and the bearing surface temperature are measured along with the shaft speed and the bearing load, and they are compared with the theoretical results. The results obtained by the experiment are in good agreement with those by the theory including the inlet pressure effect. It is suggested that the three dimensional turbulent THD analysis including the inlet pressure effect is very useful to predict the performance of the large tilting pad journal bearing more accurately.
Coupled Thermal-Mechanical Analysis of Rubber Oil Seals
Journal of the Korean Society of Tribologists and Lubrication Engineers, volume 10, issue 2, 1994, Pages 39~42
This paper deals with the distributions of the contact stress in oil seals. The distributions of the contact stress due to the temperature effects are analyzed for various values of the interference for a nitrile rubber seal. The calculated FEM results show that the relative maximum stresses occur at the contacting area against the shaft, the flex zone, and the contacting area of the garter spring grooves. Using the coupled temperature-stress FEM a nalysis, the contact force of a radial lip seal with and without the garter spring are studied as a function of shaft diameter. The calculated results of mechanical analysis show good correspondence with those of the coupled thermal-mechanical analysis method except small values of the interference. And the calculated results indicated that the thermal stresses only have a very minor influence on the deformed shape of the lip seal as the interference increases. But the coupled temperature-stress analysis will be very useful tool to predict the contact behaviors of rubber lip seals for small values of the interference.
A Study on the Vibration Control Using Magnetic Bearings of the Flexible Shaft Supported by Hydrodynamic Bearings
Journal of the Korean Society of Tribologists and Lubrication Engineers, volume 10, issue 2, 1994, Pages 43~50
The hydrodynamic bearing is accepted in many rotating systems because it has a large load carrying capacity. But the anisotropic pressure distribution of the bearing can arise the unstable vibration phenomenon over a certain speed. The magnetic bearing is an active element so that the unstable phenomenon of the hydrodynamic bearing, which is induced by the anisotropic support pressure of the oil film, can be controlled if the control algorithm and the controller gains are chosen appropriately. In this study, we investigate the stabilization method of the hydrodynamic bearing system composing the hybrid bearing which is the single unit of hydrodynamic bearing and magnetic bearing. The load carrying conditions of the hybrid bearing is modelled by the sum of the stiffness and damping coefficients of the hydrodynamic and the magnetic bearings in each direction. The dynamics of the rotor is analyzed by the Finite Element Method and the stability limit is determined by the eigenvalues of the hybrid bearings and shaft system. The eigenvalue study of the system shows that the stability limit of the hybrid bearing is increased compared to that of the hydrodynamic bearing. A Small increment of the stiffness and damping coefficient of the hybrid bearings by the magnetic actuators can increase the stability limit of the system. In this paper we tried to show the design references of the hybrid bearings by using the nondimensional bearing parameters. The analysis results show the possibilities of the stability limit increment of the hydrodynamic bearing system by combining the magnetic bearing.
Discussion on Rolling Contact Fatigue with Wear Amount by X-ray Reflection
Journal of the Korean Society of Tribologists and Lubrication Engineers, volume 10, issue 2, 1994, Pages 51~55
Rolling friction test was carried out to investigate the effect of the wear amount on rolling contact fatigue process in lubrication oil. The methods of this process were conducted at two Hertzian contact pressure and three slide ratio in each case by employing normalized and annealed carbon steel. During process of the rolling contact fatigue, the number of rotation until surface damage was occurred, the wear amount of rolling contact surface, and residual stress and half-value breadth using X-ray reflection on rolling contact surface were investigated. The result of this study shows that rolling contact fatigue process was directly influenced by wear trend and was confirmed by change of residual stress and half-value breadth on rolling contact surface.