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research-article

Measurements of the Rotordynamic Response of a Rotor Supported on Porous Type Gas Bearing

[+] Author and Article Information
Wanhui Liu

State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University, Changsha 410082, China
liuwanhuihnu@gmail.com

Kai Feng

State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University, Changsha 410082, China
jkai.feng@gmail.com

Yanwei Huo

State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University, Changsha 410082, China
hnu_hyw@163.com

Zhiyang Guo

State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University, Changsha 410082, China
guo_zy_123@hnu.edu.cn

1Corresponding author.

ASME doi:10.1115/1.4039730 History: Received April 18, 2017; Revised February 04, 2018

Abstract

A test rig is built in this study to measure the rotordynamic response of a rotor supported on porous-type gas bearings. The rotor is accelerated to ~25 krpm and coasted down. The rotor responses to different bearing supply pressures (i.e., 0.40 MPa, 0.45 MPa, and 0.50 MPa) and imbalances (i.e., 85 mg, 150 mg, and 215 mg) are measured. The critical speed increases as the bearing supply pressure increases, but the damping ratio decreases. The onset speed of the subsynchronous motion increases, and the subsynchronous amplitude decreases as the bearing supply pressure increases. The deceleration time is more than 5 min for a bearing supply pressure of 0.5 MPa. The synchronous amplitude increases as the imbalance increases for all the tested bearing supply pressures. The critical speeds for different imbalances are almost the same, except for the out-of-phase imbalance condition under a bearing supply pressure of 0.50 MPa. Nonlinear behavior is shown around the critical speed for the 215 mg out-of-phase imbalance condition under a bearing supply pressure of 0.50 MPa. The onset speed of the subsynchronous motion decreases as the imbalance increases under the in phase imbalance condition. The rotor changes from cylindrical mode to conical mode and then back to cylindrical mode as the rotor speed decreases for the in-phase imbalance conditions. However, the rotor remains in conical mode almost during the whole coast down test for the out-of-phase imbalance conditions.

Copyright (c) 2018 by ASME
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