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Fundamentals of Hydrodynamic Lubrication

Fundamentals of Hydrodynamic Lubrication. Shenghui Jia Research Assistant. Outline. Personal Background Motivation & Objectives Bearing Design Evaluation - Fixed-incline slider bearing - Parallel-step slider bearing - Journal bearing Future Work. Personal Background.

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Fundamentals of Hydrodynamic Lubrication

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  1. Fundamentals of Hydrodynamic Lubrication Shenghui Jia Research Assistant

  2. Outline • Personal Background • Motivation & Objectives • Bearing Design Evaluation - Fixed-incline slider bearing - Parallel-step slider bearing - Journal bearing • Future Work

  3. Personal Background • August 2009-July 2013 Department of Mechanical Engineering Dalian University of Technology ➢Major: Mechanical Design, Manufacture and Automation ➢Degree: Bachelor of Science ➢ GPA: 3.8/4.0 • September 2013 Joined METL • Research experience ➢Mar 2012 Ultra-precision Grinding Technology for Silicon Wafer Thinning, Research Assistant. ➢ Sep 2011 Design of Low Instantaneous Point Floating Grinding Head, Project Leader.

  4. Motivation & Objectives • Motivation Study and Understand Hydrodynamic Lubrication • Objectives Evaluate Bearing Designs • Inclined Slider Bearings • Parallel Step Bearings • Step Boundary Condition • Journal Bearings • Sommerfeld Solution • Half Sommerfeld Solution

  5. Fixed-incline Slider Bearing Pressure distributions of fixed-incline slider bearing Reduced Reynold’s Equation: (Non-dimensionalized) 1D 2D

  6. Parallel-step Slider Bearing Pressure distributions of parallel-step slider bearing Reduced Reynold’s Equation: (Step Boundary Condition: constant mass ) 1D 2D

  7. Journal Bearing Full Sommerfeld solution Half Sommerfeld solution Pressure distribution of journal bearing Reduced Reynold’s Equation: Reynolds Boundary Conditions: 2D

  8. Future Work • Compound Journal Bearing • Floating pin configuration results in multiple rotational degrees of freedom Bearing rotates pin rotates relative movement occurs f1, f2 • Investigate the pin velocity. Shear forces must balance for an unknown pin velocity, f1=f2. tappet Journal bearings

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