Identification of the dynamic performance of a gas foil journal bearing operating at high temperatures

Kyuho Sim, Yong Bok Lee, Jin Woo Song, Jongbaeg Kim, Tae Ho Kim

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

This paper presents an experimental investigation of the dynamic force performance of gas foil bearings (GFBs) at high temperatures. A dynamic performance test rig with a GFB mounted on a rotating hollow shaft, heated by a cartridge heater inside the hollow shaft, and excited by two orthogonally positioned electromagnetic shakers determines the frequency dependent stiffness and damping coefficients of the test GFB for increasing shaft temperatures. The test heater temperatures are 21°C (room temperature without heating), 100°C, 200°C, 300°C, and 400°C, and the excitation frequencies are 120 Hz, 140 Hz, 160 Hz, and 180 Hz. The test rotating speed and static load are 12 krpm and 30 N, respectively. The vibration amplitude of the test GFB is adjusted to approximately 30 μm by controlling the power amplifier connected to the electromagnetic shakers throughout the series of experiments. The test results show that both the direct stiffness and damping coefficients of the test GFB increase with increasing excitation frequencies. As the shaft temperature increases, the direct stiffness coefficients decrease by ∼ 8%, and the direct damping coefficients decrease by approximately 30%. A model prediction benchmarked against the test data reveals that the cross-coupled stiffness coefficients are smaller than the direct stiffness coefficients for the test GFB.

Original languageEnglish
Pages (from-to)43-51
Number of pages9
JournalJournal of Mechanical Science and Technology
Volume28
Issue number1
DOIs
Publication statusPublished - 2014 Jan 1

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Foil bearings
Gas bearings
Journal bearings
Stiffness
Gases
Shafts (machine components)
Damping
Temperature
Power amplifiers
Heating

All Science Journal Classification (ASJC) codes

  • Mechanics of Materials
  • Mechanical Engineering

Cite this

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title = "Identification of the dynamic performance of a gas foil journal bearing operating at high temperatures",
abstract = "This paper presents an experimental investigation of the dynamic force performance of gas foil bearings (GFBs) at high temperatures. A dynamic performance test rig with a GFB mounted on a rotating hollow shaft, heated by a cartridge heater inside the hollow shaft, and excited by two orthogonally positioned electromagnetic shakers determines the frequency dependent stiffness and damping coefficients of the test GFB for increasing shaft temperatures. The test heater temperatures are 21°C (room temperature without heating), 100°C, 200°C, 300°C, and 400°C, and the excitation frequencies are 120 Hz, 140 Hz, 160 Hz, and 180 Hz. The test rotating speed and static load are 12 krpm and 30 N, respectively. The vibration amplitude of the test GFB is adjusted to approximately 30 μm by controlling the power amplifier connected to the electromagnetic shakers throughout the series of experiments. The test results show that both the direct stiffness and damping coefficients of the test GFB increase with increasing excitation frequencies. As the shaft temperature increases, the direct stiffness coefficients decrease by ∼ 8{\%}, and the direct damping coefficients decrease by approximately 30{\%}. A model prediction benchmarked against the test data reveals that the cross-coupled stiffness coefficients are smaller than the direct stiffness coefficients for the test GFB.",
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Identification of the dynamic performance of a gas foil journal bearing operating at high temperatures. / Sim, Kyuho; Lee, Yong Bok; Song, Jin Woo; Kim, Jongbaeg; Kim, Tae Ho.

In: Journal of Mechanical Science and Technology, Vol. 28, No. 1, 01.01.2014, p. 43-51.

Research output: Contribution to journalArticle

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