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research-article

Performance Measurements of Gas Bearings with High Damping Structures of Polymer and Bump Foil via Electric Motor Driving Tests and 1-DOF Shaker Dynamic Loading Tests

[+] Author and Article Information
Kyuho Sim

Assistant Professor, Department of Mechanical System Design Engineering, Seoul National University of Science and Technology, Seoul, Korea
khsim@seoultech.ac.kr

Jisu Park

Research Assistant, Department of Mechanical System Design Engineering, Seoul National University of Science and Technology, Seoul, Korea
pjs9701@seoultech.ac.kr

1Corresponding author.

ASME doi:10.1115/1.4036063 History: Received February 05, 2017; Revised February 12, 2017

Abstract

This paper presents comprehensive test measurements for gas journal bearings with damping structures of a bump foil layer and/or a polymer layer. A one-pad top foil forms the bearing surface, under which the bearing structure and a bearing housing are located. Test bearings include gas foil bearings (GFBs), gas polymer bearings (GPBs), and gas foil-polymer bearings (GFPBs). In addition, three metal shims were employed to create wedge effects in the GFPBs. Firstly, static load-deflection tests of test bearings estimate the radial assembly clearance. Secondly, shake dynamic loading tests identify frequency-dependent dynamic characteristics. An electromagnetic shaker provides flat bearing specimens with one-degree-of-freedom vertical dynamic loading. GFPB was measured to exhibit a higher structural damping and lower stiffness than GFB. Lastly, the electric motor driving tests examine the rotordynamic stability performance. A permanent magnet (PM) synchronous motor drives a PM rotor supported on a pair of test journal bearings. As a result, the GFPBs with mechanical preloads enhanced the rotordynamic performance with no sub-synchronous motions up to the maximum rotor speed of 88 krpm, and the bearing friction characteristics as well. Furthermore, they showed comparable rotordynamic performance to three-pad GFBs from a past literature, even with larger bearing clearances and small mechanical preloads.

Copyright (c) 2017 by ASME
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