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Lubricants
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Marine Tribology
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Marine Tribology

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

Deadline for manuscript submissions: 30 June 2024 | Viewed by 6372

Special Issue Editors

Dr. Tao He

E-Mail Website
Guest Editor
Wuhan Second Ship Design & Research Institute, Wuhan 430010, China
Interests: water-lubricated bearing; lubrication regime; dynamic behaviors; tribological performances; rotor dynamics
Prof. Dr. Wu Ouyang

E-Mail Website
Guest Editor
School of Energy and Power Engineering, Wuhan University of Technology, Wuhan 430070, China
Interests: water-lubricated bearing; mixture lubrication; friction induced vibration; wear measurement; life prediction
Dr. Xingxin Liang

E-Mail Website
Guest Editor
School of Naval Architecture, Ocean and Energy Power Engineering, Wuhan University of Technology, Wuhan 430070, China
Interests: mixed lubrication; hydrodynamic lubrication; friction; wear

Special Issue Information

Dear Colleagues,

This Special Issue focuses on lubrication, friction and wear in marine engineering equipment and ships. Marine engineering equipment and high-tech ships are key development fields for ocean exploitation and utilization. The lubrication property of bearing in the power and propulsion system determines the system’s working efficiency, dynamic stability and operation effect, which is of vital importance for the operation of marine equipment and ships. To meet the low carbon and environmental protection requirements and the trend for intelligent management in the marine industry, new designs, materials, simulation methods and experimental techniques are needed to improve lubrication performance.

I invite you to submit an article related to the subject of this Special Issue, “Marine Tribology”. The journal plans to collect 10 pieces of literature related to lubrication and wear in marine equipment and vessels and then publish them in print number is reached. In this Special Issue, original research articles and reviews are welcome. The specific topics of interest for this Special Issue include (but are not restricted to) the following:

  • Lubrication mechanism of bearing;
  • Water-lubricated bearing;
  • Lubricant microstructure characterization;
  • Simulation and analysis of lubricants;
  • Corrosion/wear behavior of materials in ocean;
  • Friction and wear properties of the coating;
  • Friction-induced vibration
  • Intelligent lubricating management;
  • Novel structural design;
  • Optimization analysis of marine equipment;
  • Dynamic characteristics;

Other aspects of lubrication and wear in marine equipment and vessels.

Dr. Tao He
Prof. Dr. Wu Ouyang
Dr. Xingxin Liang
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

  • marine equipment
  • marine vessels
  • lubrication mechanism
  • water-lubricated bearing
  • intelligent lubricating management

Published Papers (6 papers)

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Research

20 pages, 6542 KiB  
Article
Analysis of Efficiency Characteristics of a Deep-Sea Hydraulic Power Source
by Donglin Li, Fuhang Guo, Liping Xu, Shuai Wang, Youpeng Yan, Xianshuai Ma and Yinshui Liu
Lubricants 2023, 11(11), 485; https://doi.org/10.3390/lubricants11110485 - 09 Nov 2023
Cited by 1 | Viewed by 1119
Abstract
Deep-sea submersibles carry limited energy sources, so a high efficiency of the equipment is required to improve endurance. In the deep-sea environment, the hydraulic power source is filled with oil, which causes structural deformation of the power source and changes in the physical [...] Read more.
Deep-sea submersibles carry limited energy sources, so a high efficiency of the equipment is required to improve endurance. In the deep-sea environment, the hydraulic power source is filled with oil, which causes structural deformation of the power source and changes in the physical properties of the medium, leading to unknown changes in the efficiency characteristics of the power source. In order to explore the efficiency characteristics of the deep-sea hydraulic power source composed of a gear pump and a DC (direct current) brushless motor in a variable sea depth environment, we undertook the following. First, considering the effects of seawater pressure and temperature on the physical properties of the medium and the radial clearance deformation of the gear pump, a mathematical model for the total efficiency of the hydraulic power source was established. The results indicate that the deformation of the pump body is mainly determined by the seawater pressure and working pressure. Subsequently, by analyzing the effects of the two factors on the efficiency of the power source, respectively, when the oil temperature range is large enough, the total efficiency of the power source will increase and then decrease under six sea depths; the total efficiency of the power source decreases with the increase in the rotational speed. However, in a land environment, the trend of the efficiency characteristics of the power source is opposite to that of the remaining six deep-sea environments, both in terms of oil temperature and rotational speed. Finally, the efficiency trend of the power source with changes in sea depth under rated conditions was obtained. Under different sea depth ranges, the optimal operating oil temperatures and suitable rotational speed ranges of the power source could be obtained. This paper could provide a certain theoretical basis for the research and development of deep-sea equipment. Full article
(This article belongs to the Special Issue Marine Tribology)
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14 pages, 5279 KiB  
Article
Research on Lubrication Characteristics of Ship Stern Bearings Considering Bearing Installation Errors
by Taiwei Yang, Hanhua Zhu, Shidong Fan, Jie Wu, Junlang Yuan and Liangyan Zheng
Lubricants 2023, 11(11), 478; https://doi.org/10.3390/lubricants11110478 - 06 Nov 2023
Viewed by 1223
Abstract
The installation quality of a propulsion shaft system directly affects the lubrication statuses of the bearings. The quality of the shaft system installation not only affects the progress of ship construction, but also the safety, stability, and reliability of the shaft system. This [...] Read more.
The installation quality of a propulsion shaft system directly affects the lubrication statuses of the bearings. The quality of the shaft system installation not only affects the progress of ship construction, but also the safety, stability, and reliability of the shaft system. This article takes sliding bearings in ship shafting as the research object and establishes a hydrodynamic lubrication model of sliding bearings while considering installation errors to address the issue of installation errors of ship stern bearings. The finite difference method and super-relaxation iteration method are used to solve the problem, and the influences of bearing installation errors on bearing lubrication characteristic parameters are explored. An installation error of the stern bearing can lead to an increase in the film pressure at both ends of the stern bearing in the axial direction, leading to a decrease in the lubrication status of the bearing. Poor lubrication and wear faults of the stern bearing are prone to occur at both ends of the stern bearing. As the installation error of the stern bearing increases, the minimum film thickness of the stern bearing decreases and the maximum film pressure increases, and as the installation error increases, the sensitivity of the aft stern bearing to the vertical installation error is greater than that of the lateral installation error, and the sensitivity of the fore stern bearing to the lateral installation error is greater than that of the vertical installation error. The sensitivity of the lateral and vertical film forces at both ends of the aft stern bearing and the fore stern bearing is greater than that of the middle part; the installation error of bearings has a significant impact on the lubrication characteristics of bearings. Full article
(This article belongs to the Special Issue Marine Tribology)
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16 pages, 10066 KiB  
Article
Load Carrying Capacity Enhancing Design and Lubrication Investigation of the Magnetic-Water Double Suspension Elastic Support Thrust Bearing
by Bin Wang, Wu Ouyang, Shengtong Wang, Chenxing Sheng, Tao He and Ziyang Yan
Lubricants 2023, 11(9), 401; https://doi.org/10.3390/lubricants11090401 - 14 Sep 2023
Cited by 1 | Viewed by 959
Abstract
Aiming at the problem that the traditional water-lubricated bearing cannot carry the heavy load and adapt to the constantly changing operating conditions for the high-power Rim Driven Thruster (RDT), the principle structure of the Magnetic Water-double-suspension Elastic-support Thrust Bearing (MWETB) is designed and [...] Read more.
Aiming at the problem that the traditional water-lubricated bearing cannot carry the heavy load and adapt to the constantly changing operating conditions for the high-power Rim Driven Thruster (RDT), the principle structure of the Magnetic Water-double-suspension Elastic-support Thrust Bearing (MWETB) is designed and the optimal structure parameters of the bearing are selected using simulation. To demonstrate the reliability of the MWETB under the RDTs’ actual working conditions, performance tests, which include the magnetic flux density, magnetic force, and lubrication performance, are carried out. The simulation and experimental results indicate that the optimal offset ratios are in two intervals, and the magnetic alignment and sheath materials have a great effect on the load reduction. The load-carrying force has obvious zoning characteristics with the change in bearing clearance. Besides, compared with the water-lubricated thrust bearings, the MWETB has advantages in terms of minimum film thickness and friction coefficient. Full article
(This article belongs to the Special Issue Marine Tribology)
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11 pages, 13026 KiB  
Article
Planar Reconstruction of Regular Surfaces’ Three-Dimensional Morphology and Tribology Application
by Xiang Xu, Zekang Feng, Nengqi Xiao, Xinze Zhao and Zuyue Zhang
Lubricants 2023, 11(9), 398; https://doi.org/10.3390/lubricants11090398 - 13 Sep 2023
Viewed by 630
Abstract
The three-dimensional morphology of frictional sub-surfaces holds significant importance for studying tribological issues. However, the uniformity of the horizontal datum in 3D scanning is limited for curved surfaces, resulting in the inability to obtain accurate contour characterization parameters from the scanning results. This [...] Read more.
The three-dimensional morphology of frictional sub-surfaces holds significant importance for studying tribological issues. However, the uniformity of the horizontal datum in 3D scanning is limited for curved surfaces, resulting in the inability to obtain accurate contour characterization parameters from the scanning results. This study aims to address this issue by constructing regular surface equations and normalizing the 3D profiler scanning results. By fitting the data, a “plane” surface representative of the surface features is obtained, and the paper demonstrates this approach on the surface morphology of different worn parts in the frictional area of spherical bearings located in the specific environment of the Three Gorges gate. The results indicate that the obtained “plane” effectively reconstructs the three-dimensional morphology map of the regular surface. Moreover, this reconstructed plane not only clearly illustrates the surface characteristics but also provides the foundation for analyzing the wear mechanism. Full article
(This article belongs to the Special Issue Marine Tribology)
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12 pages, 4123 KiB  
Article
Tribological Behavior of Ice on Rough Surfaces
by Seong-Rak Cho and Bu-Geun Paik
Lubricants 2023, 11(8), 314; https://doi.org/10.3390/lubricants11080314 - 25 Jul 2023
Viewed by 818
Abstract
Ice is a very unusual material that can not be explained by the basic physics of adhesion and friction when the ice contacts other solid materials. Several studies are being conducted to reduce resistance due to friction with sea ice during the design [...] Read more.
Ice is a very unusual material that can not be explained by the basic physics of adhesion and friction when the ice contacts other solid materials. Several studies are being conducted to reduce resistance due to friction with sea ice during the design and construction of icebreakers that break sea ice and operate. However, fundamental studies on the frictional phenomenon of ice are very lacking because not only the frictional behavior is different depending on the shape of the hull, the coating condition, the ice state, and the speed of the ship, but also it is difficult to test and measure in actual sea areas. In this study, a test method for frictional force and coefficient using ice was introduced to accurately estimate the frictional resistance of icebreakers. The frictional characteristics of model ice and freshwater ice on various rough plates were investigated, and the frictional behavior under various test conditions was measured and evaluated. In particular, the friction change according to the difference in material and the roughness change in the same material, and the friction behavior according to the test conditions were measured. Test results show that the frictional coefficient of ice depends on the material of the plate, the roughness of the plates, lubrication conditions, and ice types. In addition, the tribological behavior of ice on rough surfaces is greatly influenced by the height characteristics parameters as well as the amplitude parameters of the roughness. Full article
(This article belongs to the Special Issue Marine Tribology)
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20 pages, 9873 KiB  
Article
A Mixed Lubrication Deterministic Model of an Elastic Support Water-Lubricated Tilting Pad Thrust Bearing
by Xingxin Liang, Muyu Han, Tao He, Lijun Cui, Zhiyong Yang and Wu Ouyang
Lubricants 2023, 11(6), 262; https://doi.org/10.3390/lubricants11060262 - 15 Jun 2023
Cited by 2 | Viewed by 1033
Abstract
In order to study the effect of surface roughness on lubrication performance of an elastic support water-lubricated tilting pad thrust bearing, a mixed lubrication (ML) deterministic model is hereby presented based on a unified Reynolds equation model. This very model incorporates the elastic–plastic [...] Read more.
In order to study the effect of surface roughness on lubrication performance of an elastic support water-lubricated tilting pad thrust bearing, a mixed lubrication (ML) deterministic model is hereby presented based on a unified Reynolds equation model. This very model incorporates the elastic–plastic deformation of asperities and polymer matrix of the thrust pad, as well as the elastic deformation of the rubber support. The randomly distributed surface roughness of the thrust pad is generated by a mathematical model and shares the same distribution characteristics as the measured surface roughness. The Greenwood and Williamson asperity contact model and thin plate deformation model are combined to solve the asperities contact stress and deformation. Meanwhile, the bearing ML performance is compared with the results calculated by a thermohydrodynamic (THD) lubrication model and a thermo-elasto-hydrodynamic (TEHD) lubrication model, while the film thickness is also compared with measurements. The results show that the water film thickness calculated by the ML model is smaller than that by the THD model and the TEHD model, but the water film temperature is higher. The roughness has a great influence on the contact area ratio and the lubrication state, but little effect on the average film thickness. A higher roughness indicates a higher rotational speed required for the bearing to achieve full hydrodynamic lubrication. The film thickness calculated by the mixed lubrication model is closer to the measured results. Overall, it is proved that the mixed lubrication model can more accurately predict the lubrication performance of bearings. Compared to the thin plate deformation model, the elastic deformation simulation based on the half-infinite space model severely overestimates the elastic deformation of the pad surface, making it unsuitable for calculating the elastic deformation of the polymer matrix of the thrust pad under contact force or water film pressure. This ML deterministic model provides an effective means for high-precision prediction of the lubrication performance of the elastic supported water-lubricated thrust bearings coupled with multi-layer soft materials. Full article
(This article belongs to the Special Issue Marine Tribology)
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