Instability of Herringbone Grooved Aerodynamic Floating Bush Bearings Flexibly Supported by Foils With Hemispherical Bumps

Yoshimoto, Shigeka; Miyatake, Masaaki; Nagata, Katsuya

doi:10.1115/ijtc2007-44234

Cited by 4 publications

(4 citation statements)

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“…3. The deformation of the top foil was calculated using FEM and was substituted into equation (1), and the bearing clearance at each node was obtained. 4.…”

Section: Assume the Initial Values Of Pressure Distributionmentioning

confidence: 99%

“…Many researchers have focused on small foil journal bearings to realize small high-speed turbo machines, and the excellent stability of the foil journal bearings at high speeds has been demonstrated. Yoshimoto et al 1 proposed a multilayered dimpletype foil journal bearing and flexibly supported bush bearing with multilayered dimple-type foils. It was confirmed that a 6 mm diameter rotor supported by the proposed journal bearings stably rotated at rotational speeds of 600,000 r/min.…”

Section: Introductionmentioning

confidence: 99%

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Static characteristics of small aerodynamic foil thrust bearings operated up to 350,000 r/min

Somaya

Kishino

Miyatake

et al. 2014

Proceedings of the Institution of Mechanical Engineers, Part J:

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Foil bearings have been attracting considerable attention for their application in achieving low power consumption in small-sized turbo machines, excellent stability at high speeds, and durability at high temperature. Foil bearings with bump foils are one of the most suitable candidates for these applications as indicated in recent studies. However, it was reported that current small foil thrust bearings had insufficient load capacity to support thrust forces in practical high-speed turbo machines, and were needed to improve the load capacity at high speeds. As a first step in improving the load capacity of small foil thrust bearings, the load capacity and rotational torque of this type of foil thrust bearings that operate at up to 350,000 r/min were investigated experimentally and numerically in this paper. In the numerical calculation, the Reynolds and elasticity equations for the top foil were solved simultaneously by using the finite difference and the finite element method, respectively. It was experimentally and numerically found that the foil thrust bearings treated in this paper have the load capacity coefficient of 5.36 × 10−6 N/(mm)3 kr/min, which was comparable to that of the second-generation foil thrust bearings.

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“…3. The deformation of the top foil was calculated using FEM and was substituted into equation (1), and the bearing clearance at each node was obtained. 4.…”

Section: Assume the Initial Values Of Pressure Distributionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Static characteristics of small aerodynamic foil thrust bearings operated up to 350,000 r/min

Somaya

Kishino

Miyatake

et al. 2014

Proceedings of the Institution of Mechanical Engineers, Part J:

Self Cite

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show abstract

“…Since then, tests on the ultra-high-speed foil bearing system have been carried out. 9 Yoshimoto 10 proposed a multilayered foil bearing that supported a 6 mm diameter rotor working in 600,000 rpm stably. Hikichi et al 11 proposed a tape foil bearing that supported an 8 mm diameter rotor at 642,000 rpm successfully.…”

Section: Introductionmentioning

confidence: 99%

The limiting static and dynamic performance of foil bearings

Geng

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part J:

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Foil bearings have attracted considerable attention in small-sized turbomachines with its excellent stability, high compliance, and temperature durability. However, as the foil bearing is applied to turbine machinery with higher load and impact, the evaluation of its limiting performance becomes more important. Thus, a simple analytical method is proposed for predicting the limiting performance of the journal and thrust foil bearings. The analytical model is verified by comparing it with the full numerical algorithm. The results indicate that with the increase of rotating speed, the pressure distribution of both journal and thrust foil bearing approach to the analytical model but can never reach due to the boundary conditions. When the rotating speed tends to infinity, the principal stiffness Kxx, Kyy, Kzz converge to a certain value, while the cross stiffness Kxy and Kyx approach to infinity and 0, respectively. The static and dynamic performance are evaluated with foil compliance, rotor eccentricity, and film thickness as independent variables to provide further reference for system design.

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“…Then, Yoshimoto et al [15] proposed a herringbone grooved aerodynamic floating bush bearing flexibly supported by three-or fourlayered foils with hemispherical bumps. They demonstrated that a shaft supported by the proposed bearings was operated stably at higher speeds compared with conventional herringbone grooved bearings which were rigidly mounted.…”

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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Instability of Herringbone Grooved Aerodynamic Floating Bush Bearings Flexibly Supported by Foils With Hemispherical Bumps

Cited by 4 publications

References 0 publications

Static characteristics of small aerodynamic foil thrust bearings operated up to 350,000 r/min

Static characteristics of small aerodynamic foil thrust bearings operated up to 350,000 r/min

The limiting static and dynamic performance of foil bearings

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

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