Article
Engineering, Mechanical
Jinsheng Qiao, Guangwu Zhou, Wei Pu, Renpan Li, Min He
Summary: This study establishes a turbulent mixed lubrication model of water lubricated rubber bearings (WLRBs), revealing the effect mechanism of turbulence in these bearings. The rationality of the model is verified through experiments, and optimal axial misalignment and radius clearance that can maximize the turbulent force are determined.
TRIBOLOGY INTERNATIONAL
(2022)
Article
Engineering, Chemical
Yuanying Du, Hui Quan
Summary: This study establishes mixed-flow lubrication equations based on classical laminar and turbulent lubrication theories to investigate the lubrication characteristics of water-lubricated rubber bearings (WLRBs) in mixed-flow state. The results show that the mixed-flow lubrication equations are more suitable for WLRBs under actual operating conditions compared to laminar and turbulent theories. The study provides important reference for accurate analysis of WLRBs lubrication characteristics in practical engineering applications.
LUBRICATION SCIENCE
(2022)
Article
Mechanics
Yuanying Du, Jianying Lan, Hui Quan, Chenxi Sun, Xiaoyi Liu, Xueling Yang
Summary: By using four different turbulent lubrication mathematical models, the lubrication characteristics of water-lubricated rubber bearings under high-Reynolds-number operating conditions were studied. The turbulent lubrication models showed higher bearing capacity and film pressure compared to laminar lubrication models, and the Aokihiro-Harada Masahiro turbulent lubrication theory was found to be more accurate. Additionally, non-linear and approximately linear increases in bearing capacity and maximum film pressure were observed with increasing eccentricity and rotational speed, while non-linear decreases and approximately linear increases were observed with increasing clearance ratio.
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
Xiaohui Lin, Shun Wang, Shuyun Jiang, Shaowen Zhang
Summary: This study investigates the influence of interface effect and cavitation bubble distribution on the dynamic characteristics of high-speed water-lubricated spiral groove thrust bearings. A turbulent cavitating flow lubrication model is established based on two-phase fluid and population balance equation of bubbles. The stiffness and damping coefficients of the bearings are calculated using perturbation pressure equations. Experimental results validate the theoretical model. The findings suggest that the turbulent effect has a greater impact on the dynamic characteristics of the bearings compared to the cavitation effect.
CHINESE JOURNAL OF MECHANICAL ENGINEERING
(2022)
Article
Engineering, Mechanical
Guangwu Zhou, Kepeng Wu, Wei Pu, Peng Li, Yanfeng Han
Summary: This paper investigates the modification effects of different nano-fillers on the basic formulation of hydrogenated nitrile rubber (HNBR). The results show that UHMWPE and GF have different improvements on the tribological performance of rubber materials under different speed conditions. To achieve the best comprehensive performance, appropriate nano-fillers should be selected for modification according to the operating conditions.
Article
Engineering, Mechanical
Peng Liang, Xingyang Li, Feng Guo, Yuzhe Cao, Xiaohan Zhang, Fulin Jiang
Summary: This study established a start-up model of water-lubricated bearing and analyzed the influence of sea wave shock on the startup performance of the bearing, indicating that appropriate shock load can suppress the vibration phenomenon. Moreover, the study also pointed out that the earlier the shock load enters, the worse the system's stability becomes.
TRIBOLOGY INTERNATIONAL
(2022)
Article
Engineering, Mechanical
J. C. Atwal, R. K. Pandey
Summary: This paper explores the performance parameters of a sector-shaped pad thrust bearing lubricated with water using a new pocket design, considering the effects of turbulence and cavitation. The study investigates the effects of new pocket attributes and compares the performance behaviors achieved with the new pocketed pad bearing with plain pad and rectangular pocketed bearing.
TRIBOLOGY INTERNATIONAL
(2021)
Article
Chemistry, Multidisciplinary
Yanfeng Han, Ting Tang, Guo Xiang, Hang Jia
Summary: This study investigates the impact of propeller shaft deflection on the fluid-solid-heat coupling performance of water lubricated rubber stern bearing, and develops a model to validate the findings. Results suggest that under heavy load conditions, the deflection of the stern shaft should be taken into account in the analysis of FSH performance of the JWR system.
APPLIED SCIENCES-BASEL
(2021)
Article
Engineering, Multidisciplinary
Xie Zhongliang, Jiao Jian, Yang Kang, He Tao
Summary: This paper studies the anti-eccentric load margin of a novel structure bearing lubricated by low viscosity medium. The results show that the bearing has self-stability margin of anti-tilted and anti-eccentric load and the eccentric load has little influence on the static/dynamic characteristics of the bearing under different speed conditions. This research provides a theoretical basis for the application of such kinds of special structure bearings.
SCIENCE CHINA-TECHNOLOGICAL SCIENCES
(2022)
Article
Engineering, Mechanical
Hao Zhang, Xiaohui Lin, Shuyun Jiang
Summary: This study proposes a turbulent flow model considering the effects of turbulence and cavitation in water-lubricated bearings, and validates the model through simulations and experiments. The results demonstrate that both turbulence and cavitation effects have significant impacts on the static characteristics of the bearing.
JOURNAL OF TRIBOLOGY-TRANSACTIONS OF THE ASME
(2023)
Article
Engineering, Mechanical
Jaroslav Zapomel, Petr Ferfecki
Summary: The paper presents a new design concept for a hydrodynamic bearing lubricated by composite magnetic fluids. The mathematical model and computational procedures were developed to study the behavior and performance of the bearing. The research shows that increasing the magnetic induction in the bearing gap improves the bearing load capacity and centers the journal. The advantage of this bearing is its semiactive operation principle.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2022)
Article
Engineering, Electrical & Electronic
Nan Wang, Yifan Zhao, Chengfeng Li, Peng Wang, Changming Zhang
Summary: Accurate measurement of film pressure distribution in water-lubricated bearings is essential for understanding bearing characteristics. Traditional power supply methods for wireless sensor nodes are not suitable for rotational conditions, so a contactless power supply method using a magnetic coupler was proposed. Tests showed that the proposed method achieved high efficiency and stability, making it applicable to other rotating equipment.
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
(2023)
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, Mechanical
Guo Xiang, Yijia Wang, Cheng Wang, Zhongliang Lv
Summary: The study investigates the dynamic characteristics of water-lubricated rubber bearings considering asperity contact, including water-film stiffness and damping coefficients and plastic-elastic contact stiffness coefficient. The findings show that stiffness and damping coefficients of water film and the contact stiffness of asperity increase with decreasing radial clearance, while dynamic coefficients are less sensitive to rubber thickness compared with rubber's elastic modulus. Additionally, a sudden change in water film direct stiffness and damping coefficients is observed due to the presence of grooves when the eccentricity ratio ranges from 0.6 to 1.0.
INDUSTRIAL LUBRICATION AND TRIBOLOGY
(2021)
Article
Engineering, Mechanical
Busra Duran, Jerome Cavoret, David Philippon, Fabrice Ville, Arnaud Ruellan, Frank Berens
Summary: This study analyzes the changes in the physicochemical properties and tribological performances of gear transmission oils during field operation, finding differences from traditional engine oils.
TRIBOLOGY INTERNATIONAL
(2024)
Article
Engineering, Mechanical
Baocheng Liu, Hongsheng Chen, Jun Zhou, Jing Wang, Wenxian Wang, Xiaochun Chen, Sanxiao Xi
Summary: This study used fast hot pressing sintering to fabricate WC/AlCoCrFeNi2.1 metal matrix composites (MMCs). It was found that the addition of reinforced particles increased the microhardness, nanoindentation and wear resistance of the MMCs. During frictional processes, an oxide film formed, providing material protection, enhancing stability and reducing friction-induced losses.
TRIBOLOGY INTERNATIONAL
(2024)
Article
Engineering, Mechanical
Pradip Kumar Verma, Alok Singh
Summary: This study investigates the mechanical properties and wear resistance of CoMoMnNiV high entropy alloy reinforced aluminium matrix composite processed through stir-squeeze casting assisted with an ultrasonic transducer. The results show significant improvements in mechanical properties and wear resistance, with the composite containing 8 wt% HEA demonstrating the highest resistance to wear. Optical microscopy, SEM, and an optical profilometer were used for a thorough examination of the microstructure and worn surface.
TRIBOLOGY INTERNATIONAL
(2024)
Article
Engineering, Mechanical
Zhenghai Yang, Yingjian Song, Jinlong Jiao, Wenbo Li, Bao Shangguan, Yongzhen Zhang
Summary: This study investigated the friction, wear properties, and current-carrying properties of copper-graphite composites paired with brass C28000. The results showed that the current-carrying properties of the composite materials were excellent, but their wear rate was the main limiting factor. Furthermore, an increase in the thickness of the graphite layer led to an improvement in the uniformity of damage.
TRIBOLOGY INTERNATIONAL
(2024)
Article
Engineering, Mechanical
Moustafa Mahmoud Yousry Zaghloul, Karen Steel, Martin Veidt, Michael T. Heitzmann
Summary: This research evaluates and compares the impact of different material types on the tribological characteristics of Polyamide 6 composites, and finds that glass fiber-reinforced Polyamide 6 exhibits better friction and wear performance under high-pressure velocity factors.
TRIBOLOGY INTERNATIONAL
(2024)
Article
Engineering, Mechanical
Shaoqing Qin, Lida Zhu
Summary: In this paper, the surface and subsurface damage of laser assisted grinding CrCoNi medium entropy alloys were investigated using molecular dynamics simulations. The results showed that the application of laser energy can reduce cutting forces and minimize subsurface damage.
TRIBOLOGY INTERNATIONAL
(2024)
Article
Engineering, Mechanical
Kaikui Zheng, Youxi Lin, Tingzheng Lai, Chenghui Gao, Ming Liu, Zhiying Ren
Summary: The study investigated the use of waste foundry resin-bonded sand as a substitute for copper in resin-based brake material. It found that the waste sand was more favorable for improving the overall friction and wear properties of the material compared to copper. Waste sand benefited the material by forming a friction layer, leading to increased friction coefficient and stability. Brake material with 10-15% waste sand showed excellent heat-fade resistance.
TRIBOLOGY INTERNATIONAL
(2024)
Article
Engineering, Mechanical
Dayang Li, Fanhao Zhou, Yutong Gao, Kun Yang, Huimin Gao
Summary: This article introduces a continuous prediction model based on deep learning for predicting the power output of steam turbines. The model uses long short term memory (LSTM) method to develop a trend prediction model and optimizes the prediction model through feature selection method. Experimental results show that the model outperforms other models in terms of prediction performance.
TRIBOLOGY INTERNATIONAL
(2024)
Article
Engineering, Mechanical
Tomohiro Toyoda, Ryo Yasuike, Toshihiro Noda
Summary: In this study, a elasto-plastic constitutive model of friction incorporating the concept of superloading surface was developed based on the subloading friction model. The proposed model achieves a smooth transition of friction by describing the evolution rule of structure, treating the state with static friction coefficient larger than kinetic friction coefficient as the bulkiness of structure. The positive definiteness of the plastic multiplier, loading condition, and material parameters were derived, and the validity of the proposed model in accordance with the subloading-friction model was confirmed through a stick-slip simulation of a mass-spring system.
TRIBOLOGY INTERNATIONAL
(2024)
Article
Engineering, Mechanical
P. Balaji, B. Surya Rajan, K. Sathickbasha, P. Baskara Sethupathi, Deviga Magadevan
Summary: This study emphasizes the importance of using a variety of solid lubricants with different oxidation temperature regimes to enhance the tribological performance of brake pads.
TRIBOLOGY INTERNATIONAL
(2024)
Article
Engineering, Mechanical
Jian Ma, Yancong Liu, Javad Mostaghimi, Na Zhang
Summary: This paper investigates the influence of preparation strategies on the lubrication properties of surface textures. Three laser scanning strategies are proposed to achieve a sinusoidal textured surface, and the evolution of surface structure and chemical composition is discussed. The findings show that ridge structures enhance anti-wear properties but also increase the friction coefficient. However, the oil cover preparation method prevents the formation of ridges and improves wettability.
TRIBOLOGY INTERNATIONAL
(2024)
Article
Engineering, Mechanical
Mohammad Roostaei, Arvin Taghizadeh Tabrizi, Hossein Aghajani
Summary: In this research, the Al2O3/MoS2 nanocomposite coating layer was successfully applied on the surface of Ti-6Al-4 V alloy. The relation between the surface characteristics and wear resistance of the coating was studied using atomic force microscopy analysis and pin-on-disk wear test method. The results showed that the nanocomposite coating significantly reduced the wear rate and provided an equation to calculate the Lancaster coefficient.
TRIBOLOGY INTERNATIONAL
(2024)
Article
Engineering, Mechanical
Musa Bilgin, Sener Karabulut, Halil Karakoc, Yunus Kayir, Murat Sarikaya
Summary: This study investigates various methods to improve the machinability efficiency of Inconel 718 alloy while considering their effect on microstructural properties. The results show that hot+PMQL, hot+SiCNMQL, and hot+Al2O3-NMQL contribute significantly to the improvement of machinability characteristics. The EBSD analysis also reveals that a limited area is affected by heat in the hot machining environment and that the removal of the heated layer during milling process helps preserve the microstructure.
TRIBOLOGY INTERNATIONAL
(2024)
Article
Engineering, Mechanical
Q. Gao, Y. Fan, Y. G. Wu, J. L. Liu, J. Wang, L. Li
Summary: Fretting wear significantly affects the hysteresis behavior of the contact surface and leads to joint degradation. This study investigates the influence of harmonic normal force on the evolution of interface morphology and contact parameters with fretting wear. The results show that the harmonic normal force can significantly influence the hysteresis loop and the energy dissipation distribution on the contact surface.
TRIBOLOGY INTERNATIONAL
(2024)
Article
Engineering, Mechanical
Benjamin Weiland, Floriane Leclinche, Anis Kaci, Brigitte Camillieri, Betty Lemaire-Semail, Marie -Ange Bueno
Summary: This study presents a systematic approach to generating control signals for a tactile simulator that simulate the touch of textile fabrics. By using a friction modulation tactile surface and acquiring forces from real surfaces with artificial finger mimicking fingerprints, control signals are generated and processed in the frequency domain before sending them to the tactile stimulator. The study focuses on the potential benefits of incorporating fingerprint information in fabric simulations to achieve a more realistic tactile perception. A sensory analysis with 36 participants using the generated control signals showed better discrimination without fingerprint information.
TRIBOLOGY INTERNATIONAL
(2024)