Title page for etd-0811113-121512


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URN etd-0811113-121512
Author Po-Chung Shih
Author's Email Address No Public.
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Department Mechanical and Electro-Mechanical Engineering
Year 2012
Semester 2
Degree Master
Type of Document
Language zh-TW.Big5 Chinese
Title Thermal Effects on the Performance of Journal Bearings
Date of Defense 2013-07-29
Page Count 87
Keyword
  • deflection of the journal
  • thermohydrodynamic
  • adiabatic
  • journal bearings
  • the load capacity
  • Abstract In this study, the numerical method was applied to simulate the thermal effects on the performance of journal bearings. In the adiabatic conditions, no heat was removed through either the journal or bushing, but the thermohydrodynamic conditions considered this heat transfer. Results showed that the temperature of the oil film at the pressure zone for the thermohydrodynamic conditions was higher than that of the adiabatic condition due to the heat conduction from the journal and the bushing to oil film. At the constant eccentricity ratio, the load capacity for the isothermal condition was higher than that of the adiabatic conditions, and the thermohydrodynamic conditions was the lowest due to higher temperature at the pressure zone.
    Under the thermohydrodynamic conditions and the constant rotational speed, with increasing load, the thicknesses of the oil films decreased, so that the temperatures of the journal surface and the bush inner surface increased. This effect became significant at higher rotational speeds. At the constant eccentricity ratio, the greater the radial clearance, the thicker the oil film was, so that the temperature rice was decreased. Considering the deflection of the journal at the adiabatic conditions, results showed that the temperature rise increased at the thinner position of the oil film, and the oil temperature was not uniform along the axial direction of the bearing.
    Advisory Committee
  • Li-Ming Chu - chair
  • Yuh-Ping Chang - co-chair
  • Rong-Tsong Lee - advisor
  • Yuang-Cherng Chiou - advisor
  • Files
  • etd-0811113-121512.pdf
  • Indicate in-campus at 5 year and off-campus access at 5 year.
    Date of Submission 2013-09-11

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