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Lubricants
Special Issues
Tribological Research on Transmission Systems
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Tribological Research on Transmission Systems

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

Deadline for manuscript submissions: 31 December 2024 | Viewed by 3844

Special Issue Editors

Dr. Qingbing Dong

E-Mail Website
Guest Editor
State Key Laboratory of Mechanical Transmission for Advanced Equipment, Chongqing University, 174 Shazheng Street, Chongqing 400030, China
Interests: contact mechanics; tribology; lubrication; fretting; wear; fatigue; fracture
Prof. Dr. Zhongliang Xie

E-Mail Website
Guest Editor
Department of Mechanics, Northwestern Polytechnical University, Xi’an 710072, China
Interests: lubrication mechanism of bearings
Special Issues, Collections and Topics in MDPI journals
Dr. Bo Zhao

E-Mail Website
Guest Editor
School of Ocean Engineering and Technology, Sun Yat-sen University, Zhuhai 519000, China
Interests: tribology; contact mechanics; fatigue; multi-physics coupling modeling of tribo-systems; ocean energy harvesting; triboelectric energy harvesting

Special Issue Information

Dear Colleagues,

Gears, bearings, splines and many other mechanical transmission components accomplish their functions through the contact between tribological pairs, which inevitably brings damage to their surfaces and likely causes the premature failure of systems. On the one hand, some local areas may be extremely pressurized, especially when the curvatures are not well-matched with improperly machined roughness. The topography, however, is constantly reshaped during the wear process with the initially concentrated stress released. On the other hand, damage accumulates as a result of cyclic stress, and micro-cracking is possibly nucleated if the material cannot resist any more damage and then rapidly propagates to fracture the structure. There exists comprehensive competition among different failure modes, and some specific methods have been proposed to locate the faults and describe the interactions between the dominant ones and the other. Still, further efforts are encouraged in this special field to improve the tribological behaviors of transmission systems. From such perspectives, a Special Issue is thus proposed to cover recent advances in the theoretical findings and engineering applications, and all relevant articles are welcomed to enrich the community.

Dr. Qingbing Dong
Prof. Dr. Zhongliang Xie
Dr. Bo Zhao
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

  • mechanical transmission
  • tribology
  • lubrication
  • friction
  • wear
  • fatigue
  • fracture
  • competing failure
  • life prediction
  • fault diagnosis

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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

18 pages, 9193 KiB  
Article
A Starved Lubrication Model: Applications to Evaluate Gear Mesh and Response Prediction of Material Plasticity
by Zhiyong Wang, Qingbing Dong and Bo Zhao
Lubricants 2024, 12(12), 414; https://doi.org/10.3390/lubricants12120414 - 26 Nov 2024
Viewed by 392
Abstract
This study presents a model of starved mixed Elastohydrodynamic Lubrication (EHL) in point and line contact to investigate the lubrication performance and material response. In formulating the governing equations for the lubrication, the dimensional Reynolds equation is discretized to involve all possible regimes [...] Read more.
This study presents a model of starved mixed Elastohydrodynamic Lubrication (EHL) in point and line contact to investigate the lubrication performance and material response. In formulating the governing equations for the lubrication, the dimensional Reynolds equation is discretized to involve all possible regimes from the boundary lubrication to fully hydrodynamic lubrication, and an additional algorithm is provided to determine the fractional film content based on the profiles of pressure distribution and film thickness. Solutions of the point contact from the present model are compared with those reported by the previous studies and good consistency can be found. The three-dimensional line contact is used to predict the load carrying capabilities of the film thickness at the interface of mating spur gear teeth. A return mapping method is implemented to take the plastic revolution into account. The solution at the initial stage of a startup process with the lubricant entrainment velocities of ux=uy=0 is compared with that from a dry contact to validate the elasto-plastic solutions. Sample cases are presented to reveal the effects of inlet oil supply condition and material plasticity on lubrication starvation. Full article
(This article belongs to the Special Issue Tribological Research on Transmission Systems)
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18 pages, 5914 KiB  
Article
Study on the Effect of Thermal Characteristics of Grease-Lubricated High-Speed Silicon Nitride Full Ceramic Ball Bearings in Motorized Spindles
by Yonghua Wang, Songhua Li, Chao Wei, Bo Liu, Yu Zhang, Gefei Lin, Kun Wang and Jining Zhao
Lubricants 2024, 12(8), 286; https://doi.org/10.3390/lubricants12080286 - 14 Aug 2024
Viewed by 719
Abstract
Grease lubrication is cost-effective and low-maintenance for motorized spindles, but standard steel bearings can fail at high speeds. This study focuses on high-speed full ceramic ball bearings lubricated with grease. The coefficient of friction torque in the empirical formula is corrected by establishing [...] Read more.
Grease lubrication is cost-effective and low-maintenance for motorized spindles, but standard steel bearings can fail at high speeds. This study focuses on high-speed full ceramic ball bearings lubricated with grease. The coefficient of friction torque in the empirical formula is corrected by establishing the heat generation model of full ceramic ball bearing and combining it with experiments. A simulation model of grease flow is established to study the influence of grease filling amount on grease distribution. The simulation model of the temperature field of a full ceramic ball bearing is established to analyze the influence of rotating speed on bearing heat generation, and experiments verify the calculation results of the theoretical model. The results show that an optimal grease filling amount of 15~25% ensures even distribution without accumulation. Additionally, when the amount of grease is constant, the outer ring temperature increases with higher rotating speeds. The test results show that when the grease filling is 0.9~1.2 g, it accounts for about 9~12% of the volume of the bearing cavity, and the temperature of the outer ring is the lowest. At a rotation speed of 24,000 rpm, the outer ring temperature of the grease-lubricated bearing is 50.1 °C, indicating a reasonable range for use in motorized spindles. It provides a theoretical basis for the optimization design of macro-structural parameters of full ceramic ball bearings in the future, which can minimize heat generation and maximize bearing capacity. Full article
(This article belongs to the Special Issue Tribological Research on Transmission Systems)
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19 pages, 30087 KiB  
Article
The Utilization of a Damping Structure in the Development of Self-Adaptive Water-Lubricated Stern Bearings
by Yong Liu, Yingzhi Zhou, Tao He and Yang Xia
Lubricants 2024, 12(2), 32; https://doi.org/10.3390/lubricants12020032 - 24 Jan 2024
Cited by 1 | Viewed by 1695
Abstract
A novel water-lubricated stern bearing damping structure with self-adaptive performance is proposed to meet the load-balancing and vibration-damping requirements of water-lubricated bearings. This innovative damping structure comprises an elastic element and a damping alloy layer. The elastic element facilitates the static and dynamic [...] Read more.
A novel water-lubricated stern bearing damping structure with self-adaptive performance is proposed to meet the load-balancing and vibration-damping requirements of water-lubricated bearings. This innovative damping structure comprises an elastic element and a damping alloy layer. The elastic element facilitates the static and dynamic load sharing of the stern bearing, mitigates the edge effects, ensures even distribution of the contact pressure along the axial direction, and enhances the overall bearing performance. Consequently, it prolongs the service life of the bearing and minimizes friction-induced stimulation. The damping alloy layer effectively attenuates the transmission of shafting vibrations to the foundation through the bearing, optimizing the vibration transmission characteristics. Leveraging the finite element model, an in-depth analysis of the compensation capability of the turning angle and damping performance of the adaptive stern bearing was conducted. The findings reveal that when the thickness of the elastic element is increased from 10 mm to 40 mm, the maximum contact pressure can be reduced by 12.53%. When the length ratio of the elastic element is reduced from 0.7 to 0.4, the maximum contact pressure is reduced by 12.42%. Therefore, increasing the thickness and decreasing the length of the elastic element in the adaptive damping device enhance the load performance, improve the compensation capabilities, and reduce the bearing wear, thereby promoting greater bearing uniformity. Furthermore, the adaptive vibration-damping device optimizes the vibration transmission characteristics from the propeller stimulation to the bearing node. The computational results demonstrate a noteworthy reduction in the speed, acceleration, and displacement responses at the first-order natural frequency, decreasing by 58.82%, 58.90%, and 58.86%, respectively. This substantial reduction in the vibration response at the first-order natural frequency signifies the effective mitigation of vibrations in the system. Full article
(This article belongs to the Special Issue Tribological Research on Transmission Systems)
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