Title page for etd-0728114-172859


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URN etd-0728114-172859
Author Rong-Yi Chen
Author's Email Address No Public.
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Department Mechanical and Electro-Mechanical Engineering
Year 2013
Semester 2
Degree Master
Type of Document
Language zh-TW.Big5 Chinese
Title Thermohydrodynamic Analysis of Stern Tube Bearings with Misalignment
Date of Defense 2014-07-28
Page Count 77
Keyword
  • minimum film thickness
  • stern tube bearing
  • thermo-hydrodynamic
  • misalignment
  • Abstract This paper intends to predict the minimum film thickness of stern tube bearing considering the misalignment caused by shaft deformation based on the thermo-hydrodynamic theory. Reynolds and energy equations are derived and solved simultaneously by the finite difference method, and the temperature distribution in the bearing bush is calculated using an infinite series in solving heat-conduction equation. Effects of rotational speed, bearing load, and bearing geometries on the bush and oil film temperature, film pressure, minimum film thickness and attitude angle are investigated.
    Results show that relationship between minimum film thickness and load is linear and the film stiffness is higher at high speeds, while those are nonlinear and lower at low speeds. To meet the requirements of the minimum film at the speeds lower than 20 rpm, the inlet temperature of the oil and/or the temperature of bush inner surface should be as small as possible. The temperature of the bush can be decreased using fluid with higher heat transfer coefficient on the bush outer surface, such as cold water. Empirical formulas for the minimum thickness in terms of the bearing number are derived by least square method for the general cases and the lower speed cases.
    Advisory Committee
  • Jen-Fin Lin - chair
  • Yeau-Ren Jeng - co-chair
  • Rong-Tsong Lee - advisor
  • Yuang-Cherng Chiou - advisor
  • Files
  • etd-0728114-172859.pdf
  • Indicate in-campus at 5 year and off-campus access at 5 year.
    Date of Submission 2014-09-01

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