Prototyping of palm top size micro gas turbine shaft system supported by foil bearings and the evaluation of dynamic characteristics

Shigehiko Kaneko, Yoshihlro Miyano, Yuji Mori, Tatsuo Watanabe

Research output: Contribution to journalReview article

Abstract

In recent years, micro gas turbines (MGT) of 100kW or less are drawing close attention as power generators equipped with cogeneration features. Aerodynamic foil bearings are considered to be the best candidate for the MGT due to its ease of maintenance. However, the details of bearing design guidelines have not been clarified though this technology is used in auxiliary power units (APU) for aircraft units. Firstly, we designed and manufactured radial foil bearings for the rotor manufactured from commercially available turbochargers. The diameter of the rotor is 20mm and the surface of the rotor is coated by ceramic. The radial bearing used here is composed of two elements; i.e. a housing and a multi wounded foil with projections of hemisphere on one side in the adequate interval. The bearing radial clearance between the rotor surface and the foil is 20m. In the experiment, we measured rotational speed and vibrations of the rotor in the radial and axial directions. Subsequently, analyses for the evaluation of first natural frequencies corresponding to lateral, conical and the first bending mode were introduced. Finally, the method for predicting the onset whirl rotational speed based on simple measurement is explained.

Original languageEnglish
Pages (from-to)227-234
Number of pages8
JournalNihon Enerugi Gakkaishi/Journal of the Japan Institute of Energy
Volume84
Issue number3
Publication statusPublished - 2005 Mar 1
Externally publishedYes

Fingerprint

Foil bearings
Bearings (structural)
Gas turbines
Rotors
Metal foil
Natural frequencies
Aerodynamics
Aircraft
Experiments

Keywords

  • Damping
  • Foil bearing
  • Micro gas turbine
  • Natural frequencies
  • Rotor dynamics
  • Whirl

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Energy Engineering and Power Technology
  • Energy(all)

Cite this

Prototyping of palm top size micro gas turbine shaft system supported by foil bearings and the evaluation of dynamic characteristics. / Kaneko, Shigehiko; Miyano, Yoshihlro; Mori, Yuji; Watanabe, Tatsuo.

In: Nihon Enerugi Gakkaishi/Journal of the Japan Institute of Energy, Vol. 84, No. 3, 01.03.2005, p. 227-234.

Research output: Contribution to journalReview article

@article{97e48e15f47341f089a3a1c717963b1d,
title = "Prototyping of palm top size micro gas turbine shaft system supported by foil bearings and the evaluation of dynamic characteristics",
abstract = "In recent years, micro gas turbines (MGT) of 100kW or less are drawing close attention as power generators equipped with cogeneration features. Aerodynamic foil bearings are considered to be the best candidate for the MGT due to its ease of maintenance. However, the details of bearing design guidelines have not been clarified though this technology is used in auxiliary power units (APU) for aircraft units. Firstly, we designed and manufactured radial foil bearings for the rotor manufactured from commercially available turbochargers. The diameter of the rotor is 20mm and the surface of the rotor is coated by ceramic. The radial bearing used here is composed of two elements; i.e. a housing and a multi wounded foil with projections of hemisphere on one side in the adequate interval. The bearing radial clearance between the rotor surface and the foil is 20m. In the experiment, we measured rotational speed and vibrations of the rotor in the radial and axial directions. Subsequently, analyses for the evaluation of first natural frequencies corresponding to lateral, conical and the first bending mode were introduced. Finally, the method for predicting the onset whirl rotational speed based on simple measurement is explained.",
keywords = "Damping, Foil bearing, Micro gas turbine, Natural frequencies, Rotor dynamics, Whirl",
author = "Shigehiko Kaneko and Yoshihlro Miyano and Yuji Mori and Tatsuo Watanabe",
year = "2005",
month = "3",
day = "1",
language = "English",
volume = "84",
pages = "227--234",
journal = "Nenryo Kyokai-Shi/Journal of the Fuel Society of Japan",
issn = "0916-8753",
publisher = "Japan Institute Of Energy",
number = "3",

}

TY - JOUR

T1 - Prototyping of palm top size micro gas turbine shaft system supported by foil bearings and the evaluation of dynamic characteristics

AU - Kaneko, Shigehiko

AU - Miyano, Yoshihlro

AU - Mori, Yuji

AU - Watanabe, Tatsuo

PY - 2005/3/1

Y1 - 2005/3/1

N2 - In recent years, micro gas turbines (MGT) of 100kW or less are drawing close attention as power generators equipped with cogeneration features. Aerodynamic foil bearings are considered to be the best candidate for the MGT due to its ease of maintenance. However, the details of bearing design guidelines have not been clarified though this technology is used in auxiliary power units (APU) for aircraft units. Firstly, we designed and manufactured radial foil bearings for the rotor manufactured from commercially available turbochargers. The diameter of the rotor is 20mm and the surface of the rotor is coated by ceramic. The radial bearing used here is composed of two elements; i.e. a housing and a multi wounded foil with projections of hemisphere on one side in the adequate interval. The bearing radial clearance between the rotor surface and the foil is 20m. In the experiment, we measured rotational speed and vibrations of the rotor in the radial and axial directions. Subsequently, analyses for the evaluation of first natural frequencies corresponding to lateral, conical and the first bending mode were introduced. Finally, the method for predicting the onset whirl rotational speed based on simple measurement is explained.

AB - In recent years, micro gas turbines (MGT) of 100kW or less are drawing close attention as power generators equipped with cogeneration features. Aerodynamic foil bearings are considered to be the best candidate for the MGT due to its ease of maintenance. However, the details of bearing design guidelines have not been clarified though this technology is used in auxiliary power units (APU) for aircraft units. Firstly, we designed and manufactured radial foil bearings for the rotor manufactured from commercially available turbochargers. The diameter of the rotor is 20mm and the surface of the rotor is coated by ceramic. The radial bearing used here is composed of two elements; i.e. a housing and a multi wounded foil with projections of hemisphere on one side in the adequate interval. The bearing radial clearance between the rotor surface and the foil is 20m. In the experiment, we measured rotational speed and vibrations of the rotor in the radial and axial directions. Subsequently, analyses for the evaluation of first natural frequencies corresponding to lateral, conical and the first bending mode were introduced. Finally, the method for predicting the onset whirl rotational speed based on simple measurement is explained.

KW - Damping

KW - Foil bearing

KW - Micro gas turbine

KW - Natural frequencies

KW - Rotor dynamics

KW - Whirl

UR - http://www.scopus.com/inward/record.url?scp=18944370127&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=18944370127&partnerID=8YFLogxK

M3 - Review article

AN - SCOPUS:18944370127

VL - 84

SP - 227

EP - 234

JO - Nenryo Kyokai-Shi/Journal of the Fuel Society of Japan

JF - Nenryo Kyokai-Shi/Journal of the Fuel Society of Japan

SN - 0916-8753

IS - 3

ER -