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, Chemical
Arun Bangotra, Sanjay Sharma
Summary: This paper presents the static performance analysis of journal bearing with full and partial surface waviness. The effect of surface waviness is considered by modifying the Reynolds equation with the film thickness equation and solved using the finite element method. The study investigates the bearing load capacity, friction coefficient, and other performance parameters under eccentricity ratios ranging from 0.2 to 0.8. Results show that the maximum performance is achieved in the circumferential direction of the full and pressure-increasing region at a high eccentricity ratio.
LUBRICATION SCIENCE
(2023)
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
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
Satish C. Sharma, Adesh Kumar Tomar
Summary: The study focuses on utilizing magneto-rheological fluid and micro-grooves to enhance the performance and stability of bearing systems, which is expected to assist in the design and analysis of bearing systems.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2021)
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
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
Mechanics
Peng Li, Hao Zhang, Xin Li, Zhanqun Shi, Sen Xiao, Fengshou Gu
Summary: The paper investigates the effect of manufacturing errors and misalignment on the lubrication behavior of journal bearings with micro-groove under dynamic loads. A mixed lubrication model is developed, considering factors such as mass conservation cavitation algorithm, asperity contact model, and force balance equation. The performance parameters of bearings with different surface profiles and micro-groove distributions are analyzed, and the results show that manufacturing errors and misalignment have a significant impact on the transient behavior of journal bearings.
Review
Engineering, Mechanical
Sitae Kim, Dongil Shin, Alan B. Palazzolo
Summary: This review summarizes the effects of nonlinear elements in fluid film journal bearings on rotor-bearing systems, including sub- and super-synchronous, chaos and thermally induced instability responses. It also discusses the importance of nonlinear, thermo-elasto-hydrodynamic aspects of journal bearings in high-performance turbomachines, and presents nonlinear solution methodologies and numerical tools for analyzing nonlinear vibration responses induced by bearings.
JOURNAL OF TRIBOLOGY-TRANSACTIONS OF THE ASME
(2021)
Article
Engineering, Mechanical
Sanjay Sharma, Aniket Sharma, Gourav Jamwal, Rajeev Kumar Awasthi
Summary: This comparative numerical study analyzed the performance of V-shape protruded, dimple textured, and untextured bearings, finding that the load-carrying capacity and coefficient of friction are maximized for the protruded textured bearing under certain conditions.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART J-JOURNAL OF ENGINEERING TRIBOLOGY
(2021)
Article
Computer Science, Interdisciplinary Applications
Alexandre Silva, Veniero Lenzi, Albano Cavaleiro, Sandra Carvalho, Luis Marques
Summary: In this work, we present FELINE, a C++ solver for hydrodynamic lubrication problems. The solver utilizes the inexact Newton iteration algorithm and a finite element method framework to accurately describe cavitation regions and solve linear complementarity problems. The performance and robustness of the solver are tested and validated against known cases in literature and industrially relevant cases of dimpled textures. A benchmark for a complex dimpled texture case is provided to evaluate the implementation's performance and robustness.
COMPUTER PHYSICS COMMUNICATIONS
(2022)
Article
Engineering, Mechanical
Dongil Shin, Alan B. Palazzolo
Summary: This study investigates the influence of misaligned journal bearing on thermally induced rotor instability, using a three-dimensional finite element model for simulations. Results indicate that the amplitude of misalignment angle affects the instability speed range.
JOURNAL OF TRIBOLOGY-TRANSACTIONS OF THE ASME
(2021)
Article
Engineering, Mechanical
Changgang Lin, Fan Jian, Shili Sun, Can Sima, Libo Qi, Mingsong Zou
Summary: The article investigates the nonlinear time-domain lubrication characteristics of the hydrodynamic journal bearing system. Through establishing the motion equation of the system based on the balance of the water film force, journal inertia force, and external load, the water film pressure distribution is calculated using the finite difference method. The effects of inertial force and rotational speed on the dynamic characteristics of the bearing are analyzed, and the influence of inertia force cannot be ignored at certain rotational speeds.
Article
Engineering, Chemical
Minghui Yang, Hong Lu, Xinbao Zhang, Meng Duan, Liu Bao, Bowen Wang, Wan Wu
Summary: The waviness of the journal and bearing bush surfaces can have different effects on the hydrodynamic journal bearing system. The profile of the surfaces near the attitude angle plays a significant role in determining the performance of the bearing system.
Review
Engineering, Mechanical
Dongil Shin, Jongin Yang, Xiaomeng Tong, Junho Suh, Alan Palazzolo
Summary: This paper provides an extensive survey of thermal modeling methods and effects in journal bearings, covering a wide range from conventional Reynolds equation models to advanced computational fluid dynamics models. Thermal effects in journal bearings play a critical role in both static and dynamic properties, influencing rotor-bearing system performance. Various bearing types and recent progress in thermal design and thermal instability problems in fluid and gas film hydrodynamic bearings are also discussed in the paper.
JOURNAL OF TRIBOLOGY-TRANSACTIONS OF THE ASME
(2021)
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)
