Article
Engineering, Mechanical
Huaiyu Zuo, Song Xue, Tao Hong, Guanying Xing, Jiacheng Han, Jinlong Ma, Run Hu, Xiaobing Luo
Summary: The flow mechanism of a novel centrifugal micro hydrodynamic axial-thrust bearing is analyzed through numerical simulations and experiments in this study. The effects of various bearing properties on its performance are explored and explained. The results indicate that the load capacity increases with inlet-suction flow rate and decreases with rotational speed. Additionally, the bearing exhibits optimal stiffness and anti-abrasion properties at a thickness of 0.3 mm.
TRIBOLOGY INTERNATIONAL
(2023)
Article
Engineering, Mechanical
J. Bouyer, M. Wodtke, M. Fillon
Summary: This study investigates the performance of a thrust bearing equipped with hydrostatic lift pockets under different lubrication modes. Experimental results showed that introducing hydrostatic lubrication can improve the bearing performance. Speed was identified as a critical parameter affecting the hydrostatic effect and film thickness.
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
Engineering, Mechanical
D. J. Ramos, G. B. Daniel
Summary: Research on hydrodynamic bearings has explored alternatives to enhance their performance. Modifying oil feeding grooves, bearing geometry, and introducing new concepts have been examples of these studies. Surface texturing, particularly microgrooves distribution, has shown promising results in improving bearing performance, with potential to increase load capacity, reduce viscous shear force, and lower average temperature in the bearing. These findings suggest that the proposed approach offers a promising alternative for enhancing hydrodynamic bearings' performance.
TRIBOLOGY INTERNATIONAL
(2022)
Article
Engineering, Chemical
Hara Prakash Mishra, Suraj Kumar Behera
Summary: This paper presents the design and numerical optimization of an oil-lubricated spiral grooved thrust bearing (SGTB) for high-speed and axial loading conditions. A numerical model is developed using the nonlinear incompressible Reynold's equation and solved using the finite volume method (FVM) to determine the static characteristics of the bearing. The influence of groove parameters on the bearing's static characteristics is investigated, and it is found that the designed SGTB can operate at high-speed conditions and withstand high axial loads. The characteristic data sets obtained from the numerical analysis are trained using an artificial neural network (ANN) and the optimum bearing parameters are determined through an adaptive neuro-fuzzy interface system (ANFIS) surface plot.
LUBRICATION SCIENCE
(2023)
Article
Chemistry, Physical
Reo Miwa, Norifumi Miyanaga, Jun Tomioka
Summary: This study investigated the unique hysteresis phenomena in the hydrodynamic lubrication properties of dimpled thrust bearings. The dimpled specimen showed improved load-carrying capacity and reduced frictional torque compared to the dimple-free specimen. The size of cavitation bubbles within the dimples strongly influenced this phenomenon.
Article
Engineering, Mechanical
J. C. Atwal, R. K. Pandey
Summary: This paper presents the performance behaviors of a hydrodynamic thrust bearing with new pad surface designs, including microrectangular pocket and Labeo rohita fish scale texture. The effects of texture parameters on improving bearing performance have been explored, with the microrectangular pocket and fish scale texture design showing significant increases in minimum film thickness and reductions in friction coefficient compared to other designs.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART J-JOURNAL OF ENGINEERING TRIBOLOGY
(2021)
Article
Engineering, Mechanical
Bin Hu, Anping Hou, Rui Deng, Rui Wang, Zhiyong Wu, Qifeng Ni, Zhong Li
Summary: In this study, a detailed three-dimensional thermo-elastic-hydrodynamic model of a gas foil thrust bearing was established to investigate its performance. The accuracy of the model was validated by a test rig. The results demonstrate that the configuration of bump foils significantly affects the performance of gas foil thrust bearings.
Article
Engineering, Civil
Yazan Jaradat, Harry Far, Mina Mortazavi
Summary: This study conducted shaking table tests to assess the impact of seismic pounding between steel frame structures. By comparing the prediction outcomes of different theoretical models with experimental results, it was found that the linear viscoelastic model generated the least variance and most accurate predicted results.
JOURNAL OF EARTHQUAKE ENGINEERING
(2023)
Article
Engineering, Marine
Hamayun Farooq, Mehdi Ghommem, Muhammad Saif Ullah Khalid, Imran Akhtar
Summary: This study numerically investigates the hydrodynamic performance of flapping foils to explore their potential for micro-power generator development. Two operational flow regimes are identified: power generation and thrust-producing propulsion. The results show that the foil can achieve high power generation efficiency within certain parameter range.
Article
Engineering, Mechanical
Guoda Chen, Qi Lu, Yifan Ge, Wei Zhang
Summary: This study investigated the characteristics of the air film pressure field of aerostatic thrust bearing, proposing measurement equipment for 2D air film pressure field and successfully validating theoretical simulation results. Experimental results were in good agreement with theoretical results, highlighting slight discrepancies in air film pressure between different regions and a relationship between air film pressure increase and external load increase.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART J-JOURNAL OF ENGINEERING TRIBOLOGY
(2022)
Article
Engineering, Mechanical
Dan Li, Xuefeng Yang, Yuanbo Wu, Jian Cheng, Shouren Wang, Zhuang Wan, Wenbo Liu, Guofeng Xia
Summary: The research on surface texture is transitioning from single macro-texture to composite micro-nano texture, with a weak focus on the anti-friction mechanisms and theoretical models. Different surface texture characteristics and their applicable working conditions are the primary research focus. This study established a mathematical model for hydrodynamic lubrication, simulated four texture models, and verified the model through friction experiments, concluding that circular, chevron, groove, and composite textures have different optimal working conditions.
CHINESE JOURNAL OF MECHANICAL ENGINEERING
(2022)
Article
Engineering, Marine
Zhe Sun, Heng Li, Zhen-hui Liu, Wen-quan Wang, Gui-yong Zhang, Zhi Zong, Yi-chen Jiang
Summary: This study investigates the hydrodynamic performance of a three-blade cycloidal propeller with flap at the trailing edge using CFD method. It is found that anti-virtual camber and sinusoidal motions can reduce side thrust and increase efficiency respectively, and these effects can be achieved simultaneously by the linear superposition of these two types of motions.
Article
Engineering, Mechanical
Fabian A. Tripkewitz, Tomas Lazak, Matthias Fritz, Eduard Stach, Matthias Weigold, Matej Sulitka
Summary: The dynamic stiffness of traditional deep recess hydrostatic bearings decreases due to fluid compressibility, but shallow recess bearings reduce this influence through reduced compressible volume and inherent stiffness. This article presents a theoretical and experimental study of the dynamic stiffness of oil hydrostatic shallow recess thrust bearings with and without external compensation devices. The study validates the theoretical models and demonstrates the potential to increase dynamic stiffness. Analytical solutions for the stiffness and damping of a circular shallow recess thrust bearing are also proposed.
TRIBOLOGY INTERNATIONAL
(2023)
Article
Construction & Building Technology
Young Chan Kim, Jong Wan Hu
Summary: This study proposes a rubber friction bearing (RFB) with improved structural performance to prevent deterioration and damage to structures and devices, and ensure seismic stability. The theoretical behavior mechanism and design details of the RFB were verified, and shear-characteristic and dynamic experiments were conducted. The results show that the RFB exhibits excellent structural seismic performance in terms of load resistance, damping force, restoring force, and energy dissipation capacity.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Engineering, Mechanical
Michal Wasilczuk, Michal Wodtke, Wolfgang Braun
TRIBOLOGY TRANSACTIONS
(2015)
Article
Engineering, Mechanical
M. Wodtke, M. Wasilczuk
TRIBOLOGY INTERNATIONAL
(2016)
Article
Engineering, Mechanical
Loukas Zoupas, Michal Wodtke, Christos I. Papadopoulos, Michal Wasilczuk
TRIBOLOGY INTERNATIONAL
(2019)
Article
Acoustics
Noel Brunetiere, Michal Wodtke
JOURNAL OF SOUND AND VIBRATION
(2020)
Article
Engineering, Mechanical
M. Wodtke, W. Litwin
Summary: The research focuses on thermal phenomena related to the operation of a water-lubricated stern tube bearing with axial grooves. Experimental tests showed that the intensity of forced axial flow significantly affects the bush temperature. Numerical simulations revealed that restricted axial flow leads to backflow of water through the grooves, resulting in a higher backflow temperature than the supply temperature and an increase in bearing bush temperature.
TRIBOLOGY INTERNATIONAL
(2021)
Article
Engineering, Mechanical
J. Bouyer, M. Wodtke, M. Fillon
Summary: This study investigates the performance of a thrust bearing equipped with hydrostatic lift pockets under different lubrication modes. Experimental results showed that introducing hydrostatic lubrication can improve the bearing performance. Speed was identified as a critical parameter affecting the hydrostatic effect and film thickness.
TRIBOLOGY INTERNATIONAL
(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
Wojciech Litwin, Michal Wasilczuk, Michal Wodtke, Artur Olszewski
Summary: The goal of this paper is to investigate the wear properties of journal sliding bearings operating in contaminated water lubrication. The experimental tests were conducted on several bearing materials and bearing sleeve designs under typical operating conditions. The results show that water contamination has a significant impact on the wear of the bearing system. Some tested materials perform well in such conditions, demonstrating lower wear rates. The design of the bearing bush also affects the wear, with different designs made from the same material showing differences exceeding 100%. Higher water velocity in the lubricating grooves helps minimize the wear of the stainless steel shaft, which is also confirmed by numerical simulations.
TRIBOLOGY INTERNATIONAL
(2023)
Article
Chemistry, Multidisciplinary
Bartosz Bastian, Rafal Gawarkiewicz, Michal Wasilczuk, Michal Wodtke
Summary: The study presents the results of research on squeeze film levitation phenomena. The investigated system consists of a vibrating surface, air squeeze film, and a freely suspended body over the film. The use of the CFD model allows for determining the steady state, periodic behavior of the air film, and the dynamics of the lifted object. Multiple factors, including mean film thickness and pressure distribution, were determined using the model. The study also shows the influence of factors such as vibration parameters on the lifting conditions. Experimental validation of the CFD model was performed, with levitation heights up to 200 microns obtained by the authors.
APPLIED SCIENCES-BASEL
(2023)
Article
Engineering, Marine
Michal Wodtke, Artur Olszewski, Artur Wojcikowski
POLISH MARITIME RESEARCH
(2018)
Article
Engineering, Marine
Artur Olszewski, Michal Wodtke, Artur Wojcikowski
POLISH MARITIME RESEARCH
(2018)
Article
Engineering, Mechanical
Monika Chmielowiec-Jablczyk, Andreas Schubert, Christian Kraft, Hubert Schwarze, Michal Wodtke, Michal Wasilczuk
Article
Engineering, Mechanical
Michal Wasilczuk, Michal Wodtke, Leszek Dabrowski
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)