Graduation Semester and Year

2018

Language

English

Document Type

Thesis

Degree Name

Master of Science in Mechanical Engineering

Department

Mechanical and Aerospace Engineering

First Advisor

Daejong Kim

Abstract

Oil-free bearing technology has several advantages over conventional oil-lubricated bearings. These advantages include high-speed operation, reduced weight, and increased reliability. Consequently, oil-free technology is expected to replace conventional bearings in a variety of applications. However, many challenges need to be addressed for widespread adoption of oil-free technology such as lower load capacity during start/stop and issues with controlling temperature. Thrust bearings, unlike their radial counterparts, are used for supporting axial loads and have become more important in recent years because of layout requirements other than double overhang configuration gaining consideration for specialized applications. Moreover, the requirements are demanding more extreme condition such as higher load capacity and temperature management. To address the challenge of listed problems, a new hydrostatic type of the thrust air foil bearing with 154mm outer diameter is introduced. Pressurized air is injected through 32 orifices which enable not only higher load carrying capacity during start/stop but also enhanced thermal management because of cooling effect. The test result of flat air bearing, damaged air foil bearing, and simple theoretical result will be shown and compared with the experimental results. The load capacity of the hydrostatic thrust foil bearing was found to be 1.5 kN (static), and it has an meaningful improvement compare to hydrodynamic and hydrostatic flat air bearing. Due to the experiment, this approach of hydrostatic air foil thrust bearings can be used extensively in the turbomachinery area without using oil under heavy load and high-temperature situation.

Keywords

Thrust air foil bearing, Hydrostatic

Disciplines

Aerospace Engineering | Engineering | Mechanical Engineering

Comments

Degree granted by The University of Texas at Arlington

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