Review
Engineering, Multidisciplinary
Xuefei Li, Zhiwei Guo, Qiren Huang, Chengqing Yuan
Summary: Water-lubricated bearing has become the future development trend due to its economy and environmental friendliness. However, poor friction performance under low speed and heavy load limits its application. Learning from nature has provided guidance and analysis basis for bionic design and theoretical research to improve the friction and wear resistance of water-lubricated bearings.
JOURNAL OF BIONIC ENGINEERING
(2022)
Article
Engineering, Multidisciplinary
Fei Hu, Changxiong Ning, Wu Ouyang
Summary: Water-lubricated polymer bearing is crucial for the operation of various equipment. This paper proposes an in-situ measurement method for bearing wear using ultrasound and parameter inversion. The experiment proves the high accuracy of parameter inversion for thickness, density, and attenuation factor, with errors within acceptable ranges.
Article
Materials Science, Multidisciplinary
Manish Kumar, Rajnesh Tyagi
Summary: This study investigates the effect of density, shape of dimples, and sliding speed on the tribological performance of laser textured bearing steel under single drop lubrication. The results suggest that a lower density of bi-triangular dimples performed better in terms of reduced coefficient of friction and wear rate as compared to circular dimples or bi-triangular dimples with 20% density.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2022)
Article
Materials Science, Multidisciplinary
Shengkang Dong, Zhiwei Guo, Hongshuang Zang, Chengqing Yuan
Summary: In this study, the tribological properties of polytetrafluoroethylene (PTFE) water-lubricated composites were investigated with different silicon carbide (SiC) content and particle size. The results showed that the wear resistance of PTFE composites can be significantly improved with a filling amount of 3-5 wt.% SiC particles. The composites with 5 wt.% SiC reduced wear loss by 99.44%. The friction and wear properties of the composites decreased as SiC particle size increased, and the wear mechanism shifted from adhesive to abrasive. The PTFE composites filled with 40 nm SiC particles exhibited the best wear resistance. This study provides an experimental basis for the development of high-performance PTFE water-lubricated bearings.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2023)
Article
Engineering, Mechanical
Alexandre R. C. Nascimento, Richard R. Chromik, Robert Schulz
Summary: This study investigated the friction and wear behavior of three materials commonly used in industrial bearing applications: a Sn-based Babbitt, polytetrafluoroethylene (PTFE), and a polyether ether ketone (PEEK) composite. The effects of load and sliding velocities on wear rates were evaluated by regression analysis, with a focus on the relationship between wear and materials mechanical properties. The ranking of wear performance correlated most strongly with the ratio of hardness to reduced modulus, with implications for estimating oil film thickness in lubrication regimes.
Review
Engineering, Mechanical
Zhongliang Xie, Jian Jiao, Kang Yang, Hao Zhang
Summary: This paper provides a detailed summary of water-lubricated bearings in five typical aspects: lubrication regime, fluid-solid interaction (FSI), thermal effect, tribological behaviors, and vibration-noise performances. It extracts and acquires the influencing factors, judgement criteria, and lubrication mechanism of the lubrication regime. The methodology and parameters influencing temperature rise are summarized. The generation mechanism of tribological behaviors and vibration & noise is obtained. The paper systematically combs and summarizes the theories and methods of water-lubricated bearings, pointing out the existing problems and urgent technologies that need to be solved. The findings can serve as a distinct theoretical and methodological reference for further investigation on water-lubricated bearings.
TRIBOLOGY INTERNATIONAL
(2023)
Article
Engineering, Chemical
K. Bobzin, C. Kalscheuer, M. Thiex, P. Sperka, M. Hartl, S. Reitschuster, E. Maier, T. Lohner, K. Stahl
Summary: The purpose of this study was to improve the wear resistance of polymers in highly stressed tribological contacts by developing and depositing diamond-like carbon (DLC) coatings on polymers. The coatings showed the ability to undergo high plastic deformations without delamination and the possibility of forming a composite layer under dry conditions. Additionally, changes in sp(2) chain and sp(2) cluster size and distribution were observed during dry contact conditions.
Article
Mechanics
Jianlin Cai, Guo Xiang, Sheng Li, Juan Guo, Jiaxu Wang, Shouan Chen, Tianyou Yang
Summary: This paper develops a mathematical model to investigate the nonlinear dynamic mixed friction behaviors of a novel coupled bearing lubricated with low-viscosity fluid. The study reveals the effect of structural parameters on the friction behavior and verifies the model through numerical simulations.
Article
Engineering, Mechanical
M. Wodtke, W. Litwin
Summary: The research focuses on thermal phenomena related to the operation of a water-lubricated stern tube bearing with axial grooves. Experimental tests showed that the intensity of forced axial flow significantly affects the bush temperature. Numerical simulations revealed that restricted axial flow leads to backflow of water through the grooves, resulting in a higher backflow temperature than the supply temperature and an increase in bearing bush temperature.
TRIBOLOGY INTERNATIONAL
(2021)
Article
Mechanics
Zhiqiang Wang, Zhangxiang Dai, Shaofeng Wu, Ben Zhang, Jiangtao Cao, Rihong Ye
Summary: This study investigates the tribological properties of a seawater-lubricated friction pair by examining the influence of cavitation and multi-scale texture on load-carrying capacity. A numerical simulation method is proposed to reveal the mechanism of cavitation's impact on load-carrying capacity, and the results are validated through experiments. The findings show that cavitation, wedge action, and vortex flow effect are the main mechanisms affecting load-carrying capacity, and cavitation's effect varies with velocity. The study also reveals the impact of different surface textures, with millimeter-scale texture exhibiting the highest load-carrying capacity.
Article
Engineering, Mechanical
Wojciech Litwin, Steffen Kropp
Summary: Water lubricated sliding journal bearings are commonly used in shipbuilding, pumps, and hydropower. This research investigates the wear process of sliding bearings lubricated with water containing solid particles of mineral origin, and finds that the geometry of the bearing and the size of the particles significantly affect wear.
Article
Engineering, Chemical
Jiefu Wang, Yanfeng Han, Zhibo Geng, Guo Xiang, Jiaxu Wang, Rui Zhao
Summary: The study introduces a profile design method based on the modified Archard model to improve the wear performance of misaligned water-lubricated bearings. Simulation results and illustrative examples demonstrate the effectiveness and applicability of this method, highlighting the importance of profile height selection in reducing edge wear.
LUBRICATION SCIENCE
(2021)
Article
Engineering, Mechanical
Chuang Wu, Yinbo Wang, Feng Chen, Xinhua Long
Summary: This paper uses the fractal theory to characterize the surface topography of water-lubricated bearings and journals, establishes a fractal contact model, and proposes a mixed-lubricated friction model based on fractal theory. Scanning experiments are conducted to obtain fractal parameters and measurements of the friction coefficient are performed to verify the effectiveness of the proposed model. Results indicate that when the grooves are in the non-main load-carrying regions, the friction characteristics of the bearing slightly change, and lower surface roughness is beneficial to improve the lubrication and friction properties of the bearing.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART J-JOURNAL OF ENGINEERING TRIBOLOGY
(2023)
Article
Engineering, Mechanical
Guangwu Zhou, Jinsheng Qiao, Wei Pu, Ping Zhong
Summary: The present study improves the conventional water-lubricated rubber bearing (WLRB) by using a tilting-pad structure and develops a mixed elastohydrodynamic (Mixed-EHD) model for water-lubricated rubber tilting-pad journal bearing (WLRTPJB). The study investigates the influence of structural and operating parameters on the tribological properties and pad swing characteristics. The results show that the WLRTPJB has a lower contact load, especially under heavy load conditions, and provide optimal pivot offset and preload factor to minimize contact pressure. Moreover, the equilibrium tilting-pad angle is sensitive to changes in design and operating parameters. This study has certain guiding significance for the design optimization of WLRB.
TRIBOLOGY INTERNATIONAL
(2022)
Article
Engineering, Mechanical
Weigang Zhao, Guoyuan Zhang, Guangneng Dong
Summary: Friction and wear behavior of several ring materials were tested under dry-friction and water-lubricated conditions in a high-speed turbopump of a liquid rocket engine. Results showed that S07 steel with a diamond-like carbon film is preferred for use under extreme conditions. These findings can offer guidance in the design of mechanical face seals in liquid rocket engines.
