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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: 25 August 2024 | Viewed by 1023

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

Published Papers (1 paper)

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Research

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 - 06 Mar 2024
Viewed by 771
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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