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Lubricants
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Applied Tribology: Rotordynamics
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Applied Tribology: Rotordynamics

A special issue of Lubricants (ISSN 2075-4442).

Deadline for manuscript submissions: closed (25 August 2024) | Viewed by 5429

Special Issue Editors

Prof. Dr. Junning Li

E-Mail Website
Guest Editor
School of Mechatronic Engineering, Xi’an Technological University, Xi’an 710021, China
Interests: tribology; rotordynamics; rolling bearing; journal bearing; fault diagnosis; modern design
Dr. Pei Li

E-Mail Website
Guest Editor
International Machinery Center, Department of Mechanical Engineering, Xi’an Jiaotong University, Xi’an 710049, China
Interests: tribology; multibody dynamics with lubricated joints; wear and lubrication in revolute joints; mechanics of materials under contact; multiscale modelling of heterogeneous materials
Dr. Rufei Yu

E-Mail Website
Guest Editor
School of Mechanical Engineering, Xi'an Aeronautical Institute, Xi’an 710077, China
Interests: surface texture; multibody system dynamics; fractal tribology

Special Issue Information

Dear Colleagues,

We wish to invite you to submit your research in this Special Issue "Applied Tribology: Rotordynamics".

In modern rotating machines, rotor-bearing systems feature multiple bearings and complex-shaped parts. These effects may significantly affect the rotordynamics behavior of high-performance rotating machinery. Therefore, desired contributions for this Special Issue should be dedicated to rotordynamics modelling and analysis of rotor-bearing systems, bearings and their tribology effect on rotordynamics, condition detection and fault diagnosis of rotor-bearing system, multibody system dynamics, tribology issues in rotating machinery, and related research and application areas.

We invite authors working on applied tribology issues to submit articles on rotordynamics problems in rotor-bearing systems that do not only demand great responsibility, but also novel knowledge, welcoming such contributions in this Special Issue.

Prof. Dr. Junning Li
Dr. Pei Li
Dr. Rufei Yu
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Lubricants is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • tribology
  • rotordynamics
  • multibody system dynamics
  • bearing
  • rotor-bearing system

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Further information on MDPI's Special Issue polices can be found here.

Published Papers (3 papers)

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Research

26 pages, 9701 KiB  
Article
Parametric Optimization of Surface Textures in Oil-Lubricated Long-Life Aircraft Valves
by Pei Li, Qingxiang Pei, Zhe Liu, Sihai Luo, Liucheng Zhou, Junning Li and Leilei Chen
Lubricants 2024, 12(12), 405; https://doi.org/10.3390/lubricants12120405 - 21 Nov 2024
Viewed by 325
Abstract
The oil-lubricated long-life aircraft valve is one of the most important components to ensure the safety of the entire aircraft system, and it needs to operate millions of times during the whole service life, significantly necessitating techniques to enhance its tribological performance. To [...] Read more.
The oil-lubricated long-life aircraft valve is one of the most important components to ensure the safety of the entire aircraft system, and it needs to operate millions of times during the whole service life, significantly necessitating techniques to enhance its tribological performance. To this end, five different surface textures, i.e., spherical cap, ellipsoidal cap, tree-frog, grass-lip and nepenthes textures were introduced to the pin’s surface of an aircraft valve to improve the valve’s tribological performance. By numerically solving the Reynolds equation with the Jakobsson–Floberg–Olsson cavitation boundary conditions, the effect of the five textures on the tribological performance was simulated. To optimize the geometric parameters of the five textures for a better tribological performance, the Analytic Hierarchy Process was introduced to derive a coupled tribological parameter, which accounts for three classical tribological parameters, including load bearing capacity, friction and friction coefficient. The five textures with optimal values of geometric parameters were also compared to one another using the Analytic Hierarchy Process, and this finally led to a suggestion of the best surface texture for the aircraft valve. The parametric optimization approach proposed in this work can be widely applied for the parametric optimization of surface textures in other applications. Full article
(This article belongs to the Special Issue Applied Tribology: Rotordynamics)
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14 pages, 4105 KiB  
Article
Numerical Computation and Experimental Research for Dynamic Properties of Ultra-High-Speed Rotor System Supported by Helium Hydrostatic Gas Bearings
by Changlei Ke, Shun Qiu, Kongrong Li, Lianyou Xiong, Nan Peng, Xiaohua Zhang, Bin Dong and Liqiang Liu
Lubricants 2024, 12(9), 302; https://doi.org/10.3390/lubricants12090302 - 27 Aug 2024
Viewed by 3192
Abstract
This study delves into the dynamic behavior of ultra-high-speed rotor systems underpinned by helium hydrostatic gas bearings, with a focus on the impact of rotational velocity on system performance. We have formulated an integrative dynamic model that harmonizes the rotor motion equation with [...] Read more.
This study delves into the dynamic behavior of ultra-high-speed rotor systems underpinned by helium hydrostatic gas bearings, with a focus on the impact of rotational velocity on system performance. We have formulated an integrative dynamic model that harmonizes the rotor motion equation with the transient Reynolds equation. This model has been meticulously resolved via the Finite Difference Method (FDM) and the Wilson-Θ technique. Our findings unveil intricate nonlinear dynamics, including 2T-periodic and multi-periodic oscillations, and underscore the pivotal role of first-order temporal fluctuations, which account for over 20% of the transient pressure at rotational speeds exceeding 95.0 krpm. Further, we have executed empirical studies to evaluate the system’s performance in practical settings. It is observed that when the ratio of low-frequency to fundamental frequency approaches 0.3 and the amplitude ratio exceeds 3, the vigilant monitoring of system stability and reliability is imperative. Collective insights from both computational simulations and experimental studies have enriched our understanding of the dynamic attributes of ultra-high-speed rotor systems. These revelations are crucial for the advancement of more efficacious and resilient rotor systems designed for high-speed applications. Full article
(This article belongs to the Special Issue Applied Tribology: Rotordynamics)
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31 pages, 12677 KiB  
Article
Experimental and Numerical Analysis of Torsional—Lateral Vibrations in Drive Lines Supported by Hydrodynamic Journal Bearings
by Fabrizio Antonio Stefani, Carlo Alberto Niccolini Marmont Du Haut Champ, Paolo Silvestri and Aristide Fausto Massardo
Lubricants 2024, 12(3), 82; https://doi.org/10.3390/lubricants12030082 - 6 Mar 2024
Viewed by 1354
Abstract
The driving and resistance torques of some rotating machinery for industrial applications are nonstationary and affect system dynamics. Under such operating conditions, coupling between torsional and lateral vibrations may become significant for drive lines supported by hydrodynamic bearings in particular design configurations. Indeed, [...] Read more.
The driving and resistance torques of some rotating machinery for industrial applications are nonstationary and affect system dynamics. Under such operating conditions, coupling between torsional and lateral vibrations may become significant for drive lines supported by hydrodynamic bearings in particular design configurations. Indeed, the occurrence of fluid–structure interactions causes a reduction in the stability threshold of the journal bearings. A hypothesis based on Hopf bifurcation theory (HBT), which justifies how the coupling phenomenon develops, is validated by means of overall experimental observations and a suitable numerical model. When the pulsating driving torque induces significant angular speed oscillation, the rotor-bearing system lateral operating response becomes more complex, and bearing instability onset is detected. Such observation proves the influence of bearings in converting torsional oscillations to lateral vibrations. Particularly, during run-up and run-down tests, localized hysteresis is observed in trends of fundamental order contents. The numerical model of the hydrodynamic bearings solves the Reynolds equation in unsteady conditions to quantify the lateral vibrations amplitude in the presence of both angular speed oscillation and dynamic perturbation. The proposed approach proves the onset of torsional–lateral vibration coupling due to hydrodynamic bearings, to a certain extent. The detected hysteresis phenomena can also be explained by the onset of journal bearing instability. Full article
(This article belongs to the Special Issue Applied Tribology: Rotordynamics)
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