Title page for etd-0731103-161832


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URN etd-0731103-161832
Author Bi-Wei Huang
Author's Email Address m9038678@student.nsysu.edu.tw
Statistics This thesis had been viewed 5561 times. Download 2796 times.
Department Mechanical and Electro-Mechanical Engineering
Year 2002
Semester 2
Degree Master
Type of Document
Language zh-TW.Big5 Chinese
Title Studies on Thin Film Characteristics of Elastohydrodynamic Lubrication Using Laser Measurement Method
Date of Defense 2003-07-18
Page Count 110
Keyword
  • elastohydrodynamic lubrication (EHL)
  • Laser Measurement
  • Thin film lubrication
  • Abstract Abstract
    With the advent of new technology, various machine structures and elements appear delicate and diminutive so that the nanotribological studies are needed in the modern mechanical technological development. Thin film lubrication will be indispensable as the basis of key-technology in high-technological devices and ultra-precision machines. Therefore, the research of thin film lubrication in the nanometer order is very important.
    In this research uses a self-development optical elastohydrodynamic lubrication (EHL) tester to simulate the oil film characteristics in the contact region between steel ball and sapphire under the pure rolling condition. First, the variation of oil film thickness on the contact region is observed by using the optical interference principle. An inverse approach of EHL is employed to investigate the pressure distribution on the contact region of lubricant. Final, the oil thickness and pressure distribution are substituted into Reynolds equation to predict the pressure-viscosity index of lubricant.
    Results show that the oil film thickness increases with increasing rolling speed, and curvature radius of steel ball, but decreases with increasing load. Moreover, when the oil thickness of ester lubricant is less than 17nm, the film thickness is obviously deviated that predicted by the classical EHL theory, and the pressure-viscosity index increases from 0.8195 to 0.9093. This result indicates that the ratio of the adsorbent layer to the oil film increases and causes the increase of the lubricant viscosity.
    Advisory Committee
  • Jen-Fin Lin - chair
  • Chiou, Yuang-Cherng - co-chair
  • none - co-chair
  • none - advisor
  • Files
  • etd-0731103-161832.pdf
  • indicate access worldwide
    Date of Submission 2003-07-31

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