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
Youcef Amine Masmoudi, Amine Brick Chaouche, Ahcene Mokhtari
Summary: This study examines the impact of texture on the performance of a hydrodynamic bearing. The introduction of rectangular texture and micro-dimples (as roughness) is found to significantly improve the bearing's performance.
TRIBOLOGY INTERNATIONAL
(2023)
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.
Article
Engineering, Mechanical
Mohammad Arif, Saurabh Kango, Dinesh Kumar Shukla
Summary: This study investigated the influence of slip zone locations on the dynamic stability of hydrodynamic journal bearings lubricated with non-Newtonian and Newtonian lubricants. The results showed that the interface of slip and no-slip regions near the upstream side of minimum film-thickness location can improve the dynamic performance parameters of the bearings. Additionally, shear-thinning lubricants combined with slip boundary conditions exhibited higher dynamic stability compared to Newtonian lubricants under conventional boundary conditions.
SURFACE TOPOGRAPHY-METROLOGY AND PROPERTIES
(2022)
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.
Article
Mechanics
Chandra B. Khatri, Saurabh K. Yadav, Gananath D. Thakre, Arvind K. Rajput
Summary: This paper investigates the application of a vein bionic texture inspired by a peepal leaf pattern to the surface of a hydrodynamic journal bearing, with the optimization done by a bio-inspired genetic algorithm. The study found that the use of the bionic texture alone increased the stability parameter by 13.08% and reduced the friction torque by 21.17%. However, the use of the GA-optimized vein-bionic texture resulted in even greater improvements, with the stability parameter increasing by up to 18.24% and the friction torque being reduced by up to 46.66%. The findings of this study are valuable for researchers in rotor dynamics seeking to stabilize systems with the use of GA-optimized vein-bionic textured journal bearings.
Article
Engineering, Mechanical
Pravez Khan, Anil Dhanola, H. C. Garg
Summary: The study investigated and compared the performance parameters of rigid and flexible journal bearings using non-Newtonian nanolubricants. Results showed that using nanolubricants significantly increased load-carrying capacity, maximum pressure, and friction force, with these parameters increasing with the power law index. The study also found that elastic deformation had a minimal effect on performance parameters.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART J-JOURNAL OF ENGINEERING TRIBOLOGY
(2021)
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
Marcus Vinicius Medeiros Oliveira, Andre Ricardo Fioravanti, Gregory Bregion Daniel
Summary: This paper proposes a novel method for identifying oil starvation using the Extended Kalman Filter, which can identify oil starvation in real-time from noisy vibration, representing a promising tool for monitoring rotating machines.
TRIBOLOGY INTERNATIONAL
(2022)
Article
Engineering, Mechanical
Jan Rendl, Stepan Dyk, Lubos Smolik
Summary: This work investigates the nonlinear dynamics of four-segment tilting pad journal bearings, focusing on pad fluttering phenomenon, which disappears at relative eccentricities lower than 0.34. Through computational modeling and bifurcation diagrams analysis, this observation is crucial for high-speed rotating machinery supported on TPJBs.
NONLINEAR DYNAMICS
(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
Debajit Das, Sashindra Kumar Kakoty
Summary: This paper investigates the effects of lubricant inertia on the performance parameters of journal bearings textured with spherical-shaped textures. The results show that lubricant inertia significantly improves the performance characteristics of textured journal bearings, especially in heavily loaded bearings. Additionally, it is found that protruded texturing produces better results compared to dimple textured journal bearings.
INDUSTRIAL LUBRICATION AND TRIBOLOGY
(2023)
Article
Engineering, Mechanical
Shaojin Shao, Yongbin Zhang, Long Chen, Xuedong Jiang
Summary: This study investigates the working condition of hydrodynamic journal bearings under excessively heavy loads and finds that the boundary adsorbed layer effect significantly influences the film pressure and load-carrying capacity of the bearings.
INTERNATIONAL JOURNAL OF AUTOMOTIVE TECHNOLOGY
(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, Mechanical
Krishnkant Sahu, Satish C. Sharma, Nathi Ram
Summary: Misalignment affects the operation of the journal bearing system, and smart lubricants can enhance the performance of fluid film bearings. The study finds that journal misalignment reduces the fluid film thickness, increases the fluid film damping coefficient, and frictional torque.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2022)
Article
Engineering, Mechanical
Wubin Xu, Peter J. Ogrodnik, Bing Li, Hongxian Zhang, Shanghan Gao
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART J-JOURNAL OF ENGINEERING TRIBOLOGY
(2015)
Article
Engineering, Mechanical
Wubin Xu, Peter J. Ogrodnik, Bing Li, Hongxian Zhang, Shanghan Gao
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART J-JOURNAL OF ENGINEERING TRIBOLOGY
(2015)
Article
Orthopedics
D. McClelland, D. Barlow, T. S. Moores, C. Wynn-Jones, D. Griffiths, P. J. Ogrodnik, P. B. M. Thomas
BONE & JOINT JOURNAL
(2016)
Article
Engineering, Biomedical
Peter J. Ogrodnik, Peter B. M. Thomas, Christopher I. Moorcroft, Khaja N. Mohammed
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART H-JOURNAL OF ENGINEERING IN MEDICINE
(2013)
Article
Engineering, Mechanical
P. J. Ogrodnik, W. Xu, M. J. Goodwin, G. A. Bancroft
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART J-JOURNAL OF ENGINEERING TRIBOLOGY
(2011)
Article
Engineering, Biomedical
Peter J. Ogrodnik, Peter B. M. Thomas
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART H-JOURNAL OF ENGINEERING IN MEDICINE
(2019)
Proceedings Paper
Engineering, Manufacturing
Wubin Xu, Dejian Zhou, Peter Ogrodnik, Mike Goodwin
FRONTIERS OF MANUFACTURING AND DESIGN SCIENCE II, PTS 1-6
(2012)
Proceedings Paper
Automation & Control Systems
Wubin Xu, Peter Ogrodnik, Mike Goodwin, Gordon Bancroft
MANUFACTURING ENGINEERING AND AUTOMATION I, PTS 1-3
(2011)
Article
Engineering, Biomedical
Peter J. Ogrodnik, C. Ian Moorcroft, Peter B. M. Thomas
MEDICAL ENGINEERING & PHYSICS
(2007)
Article
Engineering, Biomedical
P. I. Ogrodnik, C. I. Moorcroft, P. B. Thomas
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART H-JOURNAL OF ENGINEERING IN MEDICINE
(2007)
Article
Engineering, Biomedical
CI Moorcroft, PJ Ogrodnik, PBM Thomas, RH Wade
CLINICAL BIOMECHANICS
(2001)
Article
Orthopedics
CI Moorcroft, PBM Thomas, S Verborg, PJ Ogrodnik
JOURNAL OF ORTHOPAEDIC TRAUMA
(2001)
Article
Engineering, Mechanical
MJ Goodwin, JL Nikolajsen, PJ Ogrodnik
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART J-JOURNAL OF ENGINEERING TRIBOLOGY
(2003)
Article
Engineering, Biomedical
PJ Ogrodnik, CI Moorcroft, PBM Thomas
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART H-JOURNAL OF ENGINEERING IN MEDICINE
(2001)
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)
