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
Satish C. Sharma, Anil Singh
Summary: This study simulates a hybrid double layer conical porous bearing with a non-Newtonian lubricant. The investigation shows that the hybrid DCPB outperforms the hybrid single layer conical porous bearing in terms of performance parameters, and the use of non-Newtonian lubricant improves stability threshold speed margin and reduces frictional power loss.
TRIBOLOGY INTERNATIONAL
(2023)
Article
Engineering, Mechanical
Yazhou Mao, Lilin Li, Daqing Li, Jingyang Zheng
Summary: This paper investigates the turbulent lubrication performance of a textured hydrodynamic journal bearing (THJB) and analyzes the effects of structural and working parameters on the bearing performance. The results show that turbulent lubrication is suitable for actual operating conditions, but the system tends to be unstable as the eccentricity ratio and rotational speed increase.
Article
Engineering, Civil
Zakari Midjiyawa, Jon Vegard Venas, Trond Kvamsdal, Arne Morten Kvarving, Knut Helge Midtbo, Adil Rasheed
Summary: This study focuses on validating the AROME-SIMRA model, which is a nested computational fluid dynamics model that simulates both mesoscale and microscale phenomena. The validation process involved analyzing 47 hours of mean flow data collected from 13 sonic anemometers located near Sulafjord. The study explored the deviation between measured and simulated mean turbulence flow characteristics, especially for the proposed bridge construction across Sulafjord.
JOURNAL OF WIND ENGINEERING AND INDUSTRIAL AERODYNAMICS
(2023)
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
Arun Bangotra, Sanjay Sharma, Reza Taufique, Deepak Byotra
Summary: The present study investigates the influence of surface waviness on the performance of a journal bearing operating in misaligned conditions. The finite element method is utilized to compute the lubricant pressure within the bearing and obtain the static parameters. Comparison is made between different waviness variables and a misaligned journal bearing without surface waviness. It is found that misalignment in both axes has a more severe effect on static performance parameters compared to misalignment in only one axis.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART J-JOURNAL OF ENGINEERING TRIBOLOGY
(2023)
Article
Engineering, Mechanical
Jiahao Shi, Bin Zhao, Tao He, Liyue Tu, Xiqun Lu, Hanzhang Xu
Summary: This study aims to establish a thermal elastohydrodynamic (TEHD) lubrication analysis model for textured journal-thrust coupled bearing in diesel engine, taking into consideration the thermal and pressure coupled effects in the lubrication process. The model considers the flow, pressure, and thermal continuity conditions between the journal and thrust parts. Experimental results from a specific testing equipment validated the correctness of the TEHD lubrication model. Parametric analyses were conducted to explore the influences of thermal and pressure coupled effects on lubrication performances and dynamic characteristics.
TRIBOLOGY INTERNATIONAL
(2023)
Article
Engineering, Mechanical
Anil Singh, Satish C. Sharma
Summary: This study focuses on the numerical investigation of the performance effects of geometric imperfections on a porous hybrid journal bearing system operating under turbulent flow conditions. The Reynolds equation governing the lubricant flow in the bearing space is modified using turbulent lubrication theory, and the performance parameters are computed using FEM. The combined effect of turbulent flow conditions and geometric imperfections results in enhanced values of performance indicators.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART J-JOURNAL OF ENGINEERING TRIBOLOGY
(2021)
Article
Engineering, Mechanical
Adesh Kumar Tomar, Satish C. Sharma
Summary: The present study numerically analyzed the synergistic effect of recess shapes and non-linear behavior of the lubricant on 4-pocket hybrid multi-recess spherical journal bearings. The results demonstrated that the recess shapes and non-linear factor significantly affected bearing performance, and the proper selection of these factors is necessary for enhanced performance.
TRIBOLOGY INTERNATIONAL
(2022)
Article
Mechanics
Anil Singh, Satish C. Sharma
Summary: This paper explores the theoretical examination of the effect of worn bearing surfaces on the behavior of a hybrid double layer porous journal bearing system operating with power-law lubricants. The study finds that the hybrid DLPJBS operating under non-Newtonian lubricants offers enhanced values of certain dynamic coefficients. The governing equations for non-Newtonian lubricant flow in bearing porous clearance space are solved using the FEM method.
Article
Engineering, Mechanical
Abhishake Chaudhary, Arvind K. Rajput, Rajiv Verma
Summary: This study examines the effect of couple stress lubricant on an irregular journal bearing system, showing that the use of such lubricant can significantly improve the system performance.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART J-JOURNAL OF ENGINEERING TRIBOLOGY
(2021)
Article
Engineering, Mechanical
Maolin Luo, Yu Guo, Hugo Andre, Xing Wu, Jing Na
Summary: This paper proposes a novel coupled nonlinear dynamic model for a rolling element bearing with spall on the inner race to address the dynamic modeling issue of dual-impulse behavior. The study analyzes the dual-impulse time spacing and vibration responses, validating the proposed model with theoretical and experimental results showing good agreement.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2021)
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
Edoardo Gheller, Steven Chatterton, Daniele Panara, Gabriele Turini, Paolo Pennacchi
Summary: This paper applies artificial intelligence (AI) to predict the behavior of tilting pad journal bearings (TPJBs) using a trained deep learning (DL) model, which can quickly and accurately predict the dynamic and static characteristics of TPJBs compared to traditional models.
TRIBOLOGY INTERNATIONAL
(2023)
Article
Engineering, Mechanical
Jongin Yang, Alan Palazzolo
Summary: The study introduces a new CFD-based modeling approach for tilting pad journal bearings, validates its effectiveness, and points out the limitations of traditional methods. Results show that traditional methods may lead to significant prediction errors. Machine learning techniques will be used in the next part to further enhance the accuracy of conventional TPJB models.
JOURNAL OF TRIBOLOGY-TRANSACTIONS OF THE ASME
(2021)
Article
Engineering, Mechanical
Sandeep Soni
Summary: The current study investigates the impact of turbulence on the dynamic performance of a novel non-circular floating ring bearing design, showing that the non-circular design provides better stiffness characteristics and the modified bearing performs well under turbulent conditions.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART J-JOURNAL OF ENGINEERING TRIBOLOGY
(2021)
Article
Engineering, Mechanical
Sandeep Soni
Summary: The aim of this study is to assess the combined influence of turbulence and shear-thinning/shear-thickening lubricant on the steady-state characteristics of hydrodynamic journal bearings. The modified Navier-Stokes equation for linear turbulence and non-Newtonian lubricants is solved using a finite element method to determine the performance parameters for various combinations of flow behavior index and Reynolds number. By utilizing these models, this research provides valuable insights into the performance of hydrodynamic bearings under harsh industrial conditions. The results indicate that the combined presence of non-Newtonian lubricant and turbulence significantly affects the steady-state performance of the bearings compared to the individual presence of turbulence or non-Newtonian lubricant alone.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART E-JOURNAL OF PROCESS MECHANICAL ENGINEERING
(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)
