Article
Engineering, Mechanical
Guanying Xing, Song Xue, Jiacheng Han, Huaiyu Zuo, Run Hu, Zhengkai Tu, Xiaobing Luo
Summary: This paper studies the flow behavior of magnetorheological fluid in the clearance and its influence on the flow object, and proposes a flow dynamics and strain distribution model to predict the pressure distribution and lubrication characteristics.
TRIBOLOGY INTERNATIONAL
(2023)
Article
Chemistry, Multidisciplinary
Carlos Alberto Alves Viana, Diogo Stuani Alves, Tiago Henrique Machado
Summary: This paper discusses the applicability of linear/nonlinear methods for representing the dynamics of hydrodynamic bearings in rotor dynamics. Numerical simulations were performed using a computational model, and the responses of linear and nonlinear models were compared. The results showed that trilobed bearings are more susceptible to nonlinear effects, which is important for fault diagnosis in the field of structural health monitoring.
APPLIED SCIENCES-BASEL
(2022)
Article
Engineering, Mechanical
Jacopo Tacconi, Shahrokh Shahpar, Andrew King, Johannes Paulus Olufeagba, Raymarn Khan, Ian Sant, Martin Yates
Summary: Gear pumps are widely used in aero-engine fuel systems, and the design and analysis of hybrid journal bearings used in these pumps pose challenges. A numerical model has been developed to evaluate and design the pressure distribution of hybrid journal bearings for fuel pump applications. The tool has been validated and shows good accuracy and robustness.
JOURNAL OF TRIBOLOGY-TRANSACTIONS OF THE ASME
(2022)
Article
Engineering, Mechanical
He Li, Junkai Niu
Summary: This paper investigates the impact of texture on the tribological performance of journal bearings operating under starvation lubrication conditions. The P-theta model with mass conservation boundary conditions accurately predicts the oil film distribution in the full oil film/starvation region of the textured bearing. The study discusses the effects of different levels of starvation lubrication on parameters such as eccentricity, attitude angle, full film area, and friction coefficient in textured bearings. The results show that the severity of the texture's effect on bearing performance varies with starvation levels and that texturing can improve the bearing's operating performance, increase load carrying capacity, reduce friction coefficient, and enhance safety.
SURFACE TOPOGRAPHY-METROLOGY AND PROPERTIES
(2023)
Article
Engineering, Mechanical
Xun Huang, Ge Xu, Shuyun Jiang
Summary: This study proposes novel water-lubricated hydrodynamic spiral groove bearings for motorized spindles, and establishes a rotor-bearing static model for experimental research. The results show that these bearings have advantages in terms of low-temperature rise, good high-speed performance, and moderate spindle stiffness, and can be a potential alternative to fluid bearings for high-speed motorized spindles.
JOURNAL OF TRIBOLOGY-TRANSACTIONS OF THE ASME
(2023)
Article
Engineering, Mechanical
Fabricio Vieira Silva, Mauricio Araujo Zanardi, Teofilo Miguel de Souza
Summary: This study investigated the dynamics of different non-Newtonian fluids in short journal bearings using computational fluid dynamics, finding that Herschel-Bulkley and Bingham non-Newtonian fluids showed advantages in various performance parameters compared to Newtonian fluid.
JOURNAL OF THE BRAZILIAN SOCIETY OF MECHANICAL SCIENCES AND ENGINEERING
(2021)
Article
Engineering, Mechanical
Chao Fu, Weidong Zhu, Jiaojiao Ma, Fengshou Gu
Summary: This paper provides a comprehensive evaluation of crucial performances of hydrodynamic journal bearings subject to inherent uncertainties, proposing an efficient nonintrusive frame named the Chebyshev interval finite difference method. The effects of uncertainties on the static and dynamic characteristics of the journal bearing are discussed, and numerical validations are carried out, providing references to robust assessment and design of journal bearings.
JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER-TRANSACTIONS OF THE ASME
(2022)
Article
Engineering, Mechanical
F. Quinci, W. Litwin, M. Wodtke, R. van den Nieuwendijk
Summary: The study investigates the performance of a journal bearing lubricated with magnetorheological fluid using Finite Element Modelling (FEM) and experiments. Thicker fluid films, beneficial pressure distribution, and higher friction losses are observed in the bearing with magnetorheological fluid compared to oil lubrication, under all operating conditions.
TRIBOLOGY INTERNATIONAL
(2021)
Article
Engineering, Mechanical
Ozhan Gecgel, Joao Paulo Dias, Stephen Ekwaro-Osire, Diogo Stuani Alves, Tiago Henrique Machado, Gregory Bregion Daniel, Helio Fiori de Castro, Katia Lucchesi Cavalca
Summary: A framework using a deep learning algorithm to classify wear faults in hydrodynamic journal bearings was proposed, showing promising results for early diagnosis of wear faults in rotating machinery.
JOURNAL OF TRIBOLOGY-TRANSACTIONS OF THE ASME
(2021)
Article
Engineering, Mechanical
Nicolas Perez, Cristian Rodriguez
Summary: Reliable operation of the hydropower unit in hydropower plants is critical, and a dynamic model can be used for condition monitoring and accurately predicting the operation and failure of the unit.
ENGINEERING FAILURE ANALYSIS
(2021)
Article
Engineering, Mechanical
S. Boedo
Summary: This study investigates the impact of surface ellipticity on self-acting partial arc journal bearings under steady load and sinusoidal oscillation, taking into account mass conserving cavitation. The computational efficiency is improved by using a generalized Warner bearing (GWB) formula. The results demonstrate that an elliptical sleeve can significantly improve bearing performance at small oscillation amplitudes commonly found in practical applications, and a fully hydrodynamic lubrication regime can be established through the wearing-in process of the sleeve surface.
TRIBOLOGY INTERNATIONAL
(2022)
Article
Engineering, Mechanical
G. H. G. van der Meer, F. Quinci, W. Litwin, M. Wodtke, R. A. J. van Ostayen
Summary: The study investigates the application of a modified MR fluid in lubrication performance using a journal bearing test bench. It is found that applying a local magnetic field can significantly reduce the transition speed of the bearing when lubricated with MR fluid, with only a minimal increase in friction. The lubricating performance of the MR fluid is compared to a reference oil.
TRIBOLOGY INTERNATIONAL
(2023)
Article
Engineering, Electrical & Electronic
Guglielmo Giannetti, Enrico Meli, Andrea Rindi
Summary: Tilting pad journal bearings (TPJBs) are important components in modern rotating machines. This study proposes an innovative modeling approach based on efficient flexible multibody techniques to describe the behavior of TPJBs. The model is tested on a real TPJB geometry and validated through experimental tests, showing encouraging results. The proposed model can be applied in various engineering fields such as Oil & Gas and aeronautics.
Article
Engineering, Multidisciplinary
Nour. A. Marey, Wael M. El-Maghlany, Mohamed Fayed
Summary: Using a universal journal bearing test rig, this study investigated the performance of a heavily loaded main journal bearing by tracing the operational behavior of oil film temperature and pressure profiles. The results showed that a higher viscosity index oil grade improves the bearing performance and maintains temperature profile stability. Additionally, medium viscosity oil grade reduces fuel consumption and costs. The differences in shaft power performance between optimal and heavy loads decrease as the shaft speed increases. Moreover, the ability of the lubricant to enhance performance and provide stability is higher when the difference in maximum oil film pressure between optimal and heavy loads is lower. However, medium viscosity oil grade cannot be considered the best choice for part load operating conditions with heavy loads. These findings provide useful guidance for selecting a lubricant for improved performance, cost saving, and prolonged bearing life.
ALEXANDRIA ENGINEERING JOURNAL
(2023)
Article
Engineering, Mechanical
Ammar Athmania, Mustapha Lahmar, Benyebka Bou-Said, Bachir Bouchehit, John Tichy
Summary: This paper presents a numerical simulation of porous journal bearing behavior considering the interaction between fluid film and poroelastic matrix, as well as the non-Newtonian behavior of a nano-lubricant. The study found that the load capacity of the bearing increases with the characteristic size and concentration of nanoparticles, while the attitude angle, leakage flow rate, and coefficient of friction decrease. On the other hand, the permeability decreases the hydrodynamic pressure, load capacity, and leakage flow rate; but increases the attitude angle and coefficient of friction.
TRIBOLOGY INTERNATIONAL
(2023)
Article
Engineering, Mechanical
Huiyi Yang, Yang Xu, Chao Xu
Summary: This study focuses on the impact of dry friction interfaces on the dynamics of jointed structures, particularly on the statistics of contact pressure distribution. Through experimental and simulation analysis, it is found that surface roughness and contact load have significant effects on contact area, contact stiffness, and mean contact pressure.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART J-JOURNAL OF ENGINEERING TRIBOLOGY
(2024)
Article
Engineering, Mechanical
Guanglan Hu, Houfu Dai
Summary: The effect of metal coating on the machinability of cubic silicon carbide was investigated using molecular dynamics simulation. The results showed that the type of coating has a significant impact on cutting force, surface morphology, stress, and tool wear. Among the three metals studied, Cu coating had the greatest impact on improving cutting performance.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART J-JOURNAL OF ENGINEERING TRIBOLOGY
(2024)
Article
Engineering, Mechanical
Yunfan Liu, Guozheng Ma, Lina Zhu, Cuihong Han, Zhen Li, Bin Zhang, Haichao Zhao, Haidou Wang, Shuying Chen
Summary: The service performance of coated self-lubricating spherical plain bearings can be improved by applying self-lubricating coatings, especially double-sided coatings. The presence of a large-area and complete mixed friction transfer film on the contact surfaces can cause a signal downstage before the signal mutation stage.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART J-JOURNAL OF ENGINEERING TRIBOLOGY
(2024)
Article
Engineering, Mechanical
Yakup Artun, C. Oktay Azeloglu, Gokhan Taylan
Summary: This article investigates the tribological properties of polymer journal bearings, particularly focusing on radial journal bearings made from UHMWPE and POM materials with different surface qualities. The study examines the performance of these bearings under varying load and speed conditions, and analyzes the relationship between material and surface roughness in tribological performance.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART J-JOURNAL OF ENGINEERING TRIBOLOGY
(2024)
