Aerodynamic journal bearing with a flexible, damped support operating at 7.2 million DN

Waumans, Tobias; Peirs, Jan; Al‐Bender, Farid; Reynaerts, Dominiek

doi:10.1088/0960-1317/21/10/104014

Cited by 45 publications

(24 citation statements)

References 21 publications

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“…Stiffness and damping coefficients of the elastic supports which ensure the stability of the rotor are theoretically studied in [8], where it is shown that it is possible to avoid the half-speed whirl. In order to select the support parameters in an optimal way, a stability study is performed in paper [9], in which design guidelines are given.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Characterization of Rubber O-Rings: Squeeze and Size Effects

Al‐Bender

Colombo

Reynaerts

et al. 2017

Advances in Tribology

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This paper concerns the dynamic characterization of rubber O-rings used to introduce damping in high speed gas bearing systems. O-shaped rubber rings composed of high temperature rubber compounds are characterized in terms of stiffness and damping coefficients in the frequency range 100-800 Hz. Simple formulas with frequency independent coefficients were identified to express the viscoelastic properties of the O-rings. The formulas proposed approximate the stiffness and damping coefficients of O-rings of general size.

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Section: Introductionmentioning

confidence: 99%

Dynamic Characterization of Rubber O-Rings: Squeeze and Size Effects

Al‐Bender

Colombo

Reynaerts

et al. 2017

Advances in Tribology

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“…These results lead to that it is possible to simulate various O-ring support conditions by Eqs. (6,7) within the range of the measurement condition shown in Table 1. Table 3 shows the distribution of the dynamic properties of the O-rings obtained under the measurement conditions shown in Table 1.…”

Section: Identification Of Stiffness and Damping Coefficientsmentioning

confidence: 99%

“…In recent years, this type of bearing systems has attracted considerable attention with a need for increasing rotational speed in small-sized rotational machinery [5][6][7]. Foil bearings have been also investigated as a promising candidate, but their structures and performance are still uncontrolled.…”

Section: Introductionmentioning

confidence: 99%

Effect of Dynamic Properties of Support O-Rings on Stability of Herringbone-Grooved Aerodynamic Journal Bearings

Miyanaga

Tomioka

2016

Tribology Online

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This paper discusses the stability of herringbone-grooved aerodynamic journal bearings supported by rubber O-rings. In this research, the dynamic stiffness and the damping properties of the O-rings are identified in a variety of operating and design conditions. The identification results are fitted with the empirical formulae previously proposed, and the distributions of the dynamic properties in a variety of support conditions are obtained. It is theoretically investigated how the stability of the bearing system changes with the dynamic properties. The bearing tests are also performed to verify the analytical results with the empirical formulae. The empirical formulae used here was reasonable for simulating the dynamic properties of the O-rings in a variety of bearing support conditions. The comparisons between the analysis and experiments verified the effectively of analyzing the stability of the bearing system by using the empirical formulae.

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“…Tanaka et al tested the utilization of these bearings in palmtop gas turbine generators and achieved a rotation of 890,000 rpm using 4 mm diameter journal parts for the shaft for a DN number of 3,560,000 [8,9]. Waumans et al reached 1.2 million rpm (7.2 million DN) using aerodynamic journal bearing with a flexible support [10]. However, aerodynamic bearing needs small radial clearance, the radial clearance of 0.010mm was used.…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis of Influence on Gas Supply Hole Number and Radial Clearance for the Characteristics of Hydroinertia Gas Journal Bearings

Ise¹,

Nakano²,

Asami³

et al. 2015

IJMEA

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Hydroinertia gas journal bearings have been applied to solid state nuclear magnetic resonance spectroscopy.These bearings, which require a larger radial clearance than conventional externally pressurized bearings, achieve stable operation for ultra high-speed rotation of spinner shaft at several million rpm. However, their small diameters, which range within 1-6 mm, have limited experimental verifications of their static characteristics. A computational fluid dynamics analysis was therefore performed to fill this gap. The effects of radial clearance and gas supply hole number on bearing characteristics, such as pressure distribution and load capacity, were investigated. This analysis showed that negative and positive pressures generated some clearance. Pressure distribution also changes in the gas supply hole number. A large load capacity was obtained at this clearance. To verify the phenomenon, measurement of pressure distribution was performed using experimental setup. Negative pressure could be confirmed actually in the large radial clearance condition.

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Aerodynamic journal bearing with a flexible, damped support operating at 7.2 million DN

Cited by 45 publications

References 21 publications

Dynamic Characterization of Rubber O-Rings: Squeeze and Size Effects

Dynamic Characterization of Rubber O-Rings: Squeeze and Size Effects

Effect of Dynamic Properties of Support O-Rings on Stability of Herringbone-Grooved Aerodynamic Journal Bearings

Numerical Analysis of Influence on Gas Supply Hole Number and Radial Clearance for the Characteristics of Hydroinertia Gas Journal Bearings

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