Title page for etd-0811115-025836


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URN etd-0811115-025836
Author Sheng-jie Chen
Author's Email Address kero3051@gmail.com
Statistics This thesis had been viewed 5330 times. Download 1261 times.
Department Mechanical and Electro-Mechanical Engineering
Year 2014
Semester 2
Degree Master
Type of Document
Language zh-TW.Big5 Chinese
Title Hydrodynamic Lubrication Analysis of Herringbone-Grooved Journal Bearing
Date of Defense 2015-07-29
Page Count 87
Keyword
  • stepped geometry
  • herringbone groove
  • journal bearing
  • hydrodynamic lubrication
  • film pressure
  • Abstract The design parameters of herringbone-grooved journal bearing (HGJB) are employed in the analysis of the hydrodynamic lubrication theory under different operating parameters in present study. The governing equations include Reynolds equation and the same volume flow rate at the step between the groove and the ridge. They are solved by the finite difference method. Effects of the design parameters of HGJB on lubricating properties, such as load capacity, friction coefficient, pressure and stiffness are investigated. Numerical results show that the film pressure of HGJB increases as the eccentricity ratio increases, but the increase rate and the maximum film pressure of HGJB are smaller than that of plain journal bearing (PJB). HGJB shows almost no cavitation effect. The smaller pressure distribution in this divergent region is just opposed to the pressure generated by the physical wedge, so that the load capacity decreases a little. At low eccentricity ratio, it decreases significantly. It reaches a saturation value at the groove angle between 33 to 66 degrees for HGJB, and its friction coefficient is the lowest in this range of the groove angle. The film stiffness of HGJB is less than that of PJB, and the difference between them increases along with the eccentricity ratio.
    Advisory Committee
  • Yeau-Ren Jeng - chair
  • Jen-Fin Lin - co-chair
  • Rong-Tsong Lee - advisor
  • Yuang-Cherng Chiou - advisor
  • Files
  • etd-0811115-025836.pdf
  • indicate access worldwide
    Date of Submission 2015-09-11

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