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A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Mechanical Engineering".

Deadline for manuscript submissions: closed (30 September 2022) | Viewed by 11438

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Dr. Tae Ho Kim

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Guest Editor

School of Mechanical Systems Engineering, Kookmin University, Seoul, Republic of Korea
Interests: rotordynamics; bearing; turbomachinery; vibration; lubrication
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Dr. Junho Suh

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Guest Editor

Associate Professor, School of Mechanical Engineering, Pusan National University2, Busandaehak-ro 63beon-gil, Geumjeong-gu, Busan 46241, Korea
Interests: fluid film journal bearings; rolling element bearings; lubrication; contact mechanics; rotordynamics
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Special Issue Information

Dear Colleagues,

We are pleased to announce the Call for Papers for a Special Issue titled “Advances in Fluid Film Bearings” in Applied Sciences (ISSN 2076-3417; CODEN: ASPCC7), an international, peer-reviewed, open-access journal (JCR Q2).

For decades, fluid film bearings have been one of the most important machine elements used in various rotating machineries thanks to their advanced load carrying capacity, speed limit, frictional and thermal features, etc. We are interested in articles that explore the most relevant challenges of this technology. Potential topics include but are not limited to the following: journal bearings, thrust bearings, tilting pad bearings, hydrostatic bearings, active or passive controlled bearings, gas bearings, gas foil bearings, mixed lubricated bearings, and non-Newtonian fluid film bearings.

Prof. Dr. Tae Ho Kim
Dr. Junho Suh
Guest Editors

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Keywords

journal bearing
thrust bearing
gas bearing
lubrication
bearing thermal behavior

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Published Papers (4 papers)

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Research

15 pages, 10442 KiB

Open AccessArticle

Experimental Study of the Influence of Rotor Dynamics on the Temperature Distribution of a Gas Foil Bearing

by Paweł Bagiński, Grzegorz Żywica, Jakub Roemer, Paweł Zdziebko and Adam Martowicz

Appl. Sci. 2022, 12(18), 9274; https://doi.org/10.3390/app12189274 - 15 Sep 2022

Cited by 1 | Viewed by 1505

Abstract

This article presents an experimental study carried out on a rotor operating on two foil bearings. One of the bearings was built in a way to measure the temperature and deformation of the top foil of the foil bearing. The dynamic performance of the two bearing journals is presented herein using the vibration trajectories and journal positions in the foil bearing sleeve. Based on these results, a method for predicting the temperature distribution on the top foil was developed. Then, the correlations between the temperature distribution and the operating parameters of the bearing journal were illustrated. It has been observed that the symmetry of the temperature distribution on the top foil depends on the eccentricity of the rotor operation. The shape and size of the vibration trajectory had no significant effect on the temperature value in the bearing, unlike the position of the journal in the bearing. The process of loss of the gas lubricating film was observed, which provides insight into the phenomena that occur during the first few seconds of rotor operation. The areas in the bearing from which fresh air had been drawn into the gap between the journal and the top foil were also determined. Full article

(This article belongs to the Special Issue Advances in Fluid Film Bearings)

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13 pages, 3920 KiB

Open AccessArticle

Dynamic Coefficients of Tilting Pad Bearing by Perturbing the Turbulence Model

by Dongjiang Han, Chunxiao Bi, Ce Chen and Jinfu Yang

Appl. Sci. 2022, 12(13), 6348; https://doi.org/10.3390/app12136348 - 22 Jun 2022

Cited by 5 | Viewed by 1919

Abstract

Tilting pad bearings are appropriate for the trend of high efficiency and reliability design of rotating machinery due to their high stability. The laminar and turbulent flow states exist in the lubricating oil film of high-speed and heavy-load tilting pad bearings simultaneously. By perturbing the multiple flow state lubrication model with a partial derivative method, together with the pad-pivot structural perturbations, the frequency-dependent stiffness and damping coefficients of tilting pad bearings, embracing the effect of dynamical variations of both turbulence and pressure-viscous, were numerically solved in this research. The importance of each perturbed variable was studied, and the results indicate that the perturbed film thickness included in turbulence coefficients perturbations is significant enough to be taken into account otherwise the equivalent stiffness coefficients will be obviously overestimated. Unlike the perturbed film thickness, the consideration of the perturbed viscosity is optional, because it makes the stiffness and damping coefficients larger at both laminar and turbulent flow states. For a simplified simulation and conservative prediction results, the perturbed viscosity can be neglected. Full article

(This article belongs to the Special Issue Advances in Fluid Film Bearings)

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15 pages, 6610 KiB

Open AccessArticle

Development and Performance Measurements of Gas Foil Polymer Bearings with a Dual-Rotor Test Rig Driven by Permanent Magnet Electric Motor

by Jisu Park, Donghee Kim and Kyuho Sim

Appl. Sci. 2022, 12(3), 1505; https://doi.org/10.3390/app12031505 - 30 Jan 2022

Cited by 5 | Viewed by 4022

Abstract

The rotordynamic stability of journal gas foil–polymer bearings (GFPBs) applied to a dual-rotor bearing system was investigated. The GFPB has a high damping structure, i.e., it has an additional polymer layer, and top/bump/bottom foil structures. Test GFPBs were fabricated with nitrile butadiene rubber polymer layers with a thickness of 2 mm. Static-load-deflection tests of test gas foil bearings (GFBs) and GFPBs were performed to estimate the geometric bearing clearance (200 µm). The dual-rotor rotordynamic test rig consisted of a motor rotor, test rotor, and beam-type coupling. Two journal test bearings were installed on both the drive-end and non-drive-end sides of the test rotor. Predicting and testing the natural mode characteristics of the dual rotors revealed that the relative error between them was less than 7%, indicating that the first and second natural frequencies were 15 Hz and 160 Hz, respectively, and the third natural frequency was 1835 Hz in the tests. Based on the API 612 standard, the upper limit of the rotating speed for the test rig was limited to be approximately 92 krpm with a separation margin of 26%. Rotordynamic tests were conducted to examine the stability performance of GFBs and GFPBs, where the adjusted bearing clearance was 150 µm. The test results indicate that GFPBs have better stability performance in terms of delaying and suppressing unstable vibrations than GFBs. Specifically, GFPBs showed stable synchronous and subsynchronous responses up to a maximum rotating speed of 80 krpm. As a result, GFPB is a reliable lubricating element that can be used for vibration dampening in machines operating at relatively low temperatures. Full article

(This article belongs to the Special Issue Advances in Fluid Film Bearings)

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22 pages, 25742 KiB

Open AccessFeature PaperArticle

Computational Model Development for Hybrid Tilting Pad Journal Bearings Lubricated with Supercritical Carbon Dioxide

by Syed Muntazir Mehdi and Tae Ho Kim

Appl. Sci. 2022, 12(3), 1320; https://doi.org/10.3390/app12031320 - 26 Jan 2022

Cited by 7 | Viewed by 2875

Abstract

Fluid film bearings lubricated with supercritical carbon dioxide (sCO₂) eliminate the infrastructural requirement for oil lubricant supply and sealing in turbomachinery for sCO₂ power systems. However, sCO₂’s thermohydrodynamic properties, which depend on pressure and temperature, pose a challenge, particularly with computational model development for such bearings. This study develops a computational model for analyzing sCO₂-lubricated tilting pad journal bearings (TPJBs) with external pressurization. Treating sCO₂ as a real gas, the Reynolds equation for compressible turbulent flows solves the pressure distribution using the finite element method, and the Newton−Raphson method determines the static equilibrium position by simultaneously calculating forces, moments, flow rates of externally pressurized sCO₂, and pressure drop due to flow inertia. The finite difference method solves the energy equation for temperature distribution. The density and viscosity of sCO₂ are converged using the successive substitution method. The obtained predictions agree with the previous and authors’ computational fluid dynamics predictions, thus validating the developed model. Hybrid lubrication increases the minimum film thickness and stiffness up to 80% and 65%, respectively, and decreases the eccentricity ratio by up to 65% compared to those of pure hydrodynamic TPJB, indicating significant improvement in the load capacity. The bearing performance is further improved with increasing sCO₂ supply pressure. Full article

(This article belongs to the Special Issue Advances in Fluid Film Bearings)

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