Article
Engineering, Mechanical
Piet M. Lugt, Frank Berens
Summary: Bearing fatigue life is calculated using a basic rating life equation, while grease life is specified by hours running on standardized test rigs. The concept of 'Grease Life Factor' (GLF) is introduced in this paper for grease life, allowing for quantification of grease life properties using any test rig. This eliminates the need to specify grease life for standardized test rigs.
TRIBOLOGY INTERNATIONAL
(2022)
Article
Engineering, Mechanical
Yuhao Zhao, Yanyang Zi, Zhenyi Chen, Mingquan Zhang, Yuanhang Zhu, Jianshu Yin
Summary: Ball bearings in liquid rocket turbopumps operating under extreme conditions generate significant power loss. To understand the power loss mechanism, a theoretical model considering cryogenic fluid and solid lubricant influence is proposed, which simulates the rolling-sliding behavior of balls. Eight power loss components of the bearing are deduced based on tribology and kinematic analysis. The proposed model is validated and shows that sliding, spinning, and hydraulic power losses are the most important components. Additionally, the tribological behavior of the ball affects the distribution of power loss components.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
Article
Engineering, Mechanical
A. Dindar, A. S. Chimanpure, A. Kahraman
Summary: A tribo-dynamic model of ball bearings is proposed to predict their load-dependent power losses. The model combines a transient elastohydrodynamic lubrication formulation and a singularity-free dynamics model, establishing a two-way coupling to determine power losses. The model can capture contact kinematics, velocity variations, and asperity interactions on rough contact surfaces.
JOURNAL OF TRIBOLOGY-TRANSACTIONS OF THE ASME
(2022)
Article
Engineering, Mechanical
Hannes Allmaier
Summary: This literature review examines grease lubrication in rolling bearings and discusses potential ways to improve the service life of greases, with a focus on their application in rail wheel bearings. Understanding the fundamental lubrication processes is crucial for increasing the service life of rail wheel bearings.
Article
Engineering, Mechanical
T. Schirra, G. Martin, S. Puchtler, E. Kirchner
Summary: This paper presents an experimental setup and calculation procedure for measuring and predicting the electric impedance of rolling bearings as a sensor model for bearing loads. By considering unloaded rolling elements and the undeflected area of loaded rolling elements, the model has been improved to provide more accurate predictions compared to the state of the art. However, there is still a difference between measurement and calculation, which requires further approaches to reduce the discrepancy.
TRIBOLOGY INTERNATIONAL
(2021)
Article
Engineering, Mechanical
F. de Cadier de Veauce, L. Darul, Y. Marchesse, T. Touret, C. Changenet, F. Ville, L. Amar, C. Fossier
Summary: This article presents an experimental study on load-independent power losses in oil-jet lubricated deep-groove ball bearings. The influence of factors such as rotational speed, lubricant temperature, oil flow rate, and bearing dimensions on power losses were quantified through experiments. A load-independent power losses model for rolling element bearings, proposed in a previous article, was used to simulate the experiments, and the results were compared with measurements. Good agreement was found on the power losses in low-loaded deep-groove ball bearings.
TRIBOLOGY TRANSACTIONS
(2023)
Article
Engineering, Mechanical
Piet M. Lugt, Mikael Holgerson, Fredrik Reinholdsson
Summary: This paper describes the lubrication mechanism of lithium grease lubricated ball bearings in the bleed phase. The role of oxidation is highlighted and the grease life in air and nitrogen is studied in actual bearings. The study shows that grease life is mainly influenced by oxidation, but this is not deterministic. The induction time, which is the point when the antioxidants are depleted, plays a crucial role in the onset of oxidation. Furthermore, oxidation leads to the loss of base oil and lubricity, which are partially repaired through replenishment and oil release from the grease reservoirs (bleed).
TRIBOLOGY INTERNATIONAL
(2023)
Article
Chemistry, Multidisciplinary
Marvelucia Almeida, Flavia Bastos, Sara Vecchio
Summary: This article presents a mathematical and computational model to analyze sliding friction in lubricated contact between bearing surfaces using a realistic 3D model on a microscopic scale. The fluid-structure interaction model evaluates the effects of lubricant film thickness on friction in hydrodynamic and mixed lubrication regimes. Higher contact pressures were observed at the peaks of asperities, particularly during mixed lubrication where the fluid volume is smaller. The calculated friction coefficients, obtained through a homogenization procedure of shear and normal forces in hydrodynamic and mixed lubrication, were accurate and fell within the range specified in the Stribeck curve. The results demonstrate the capability of the computational model to examine the effects of lubrication on rough surface contact.
APPLIED SCIENCES-BASEL
(2023)
Article
Engineering, Mechanical
Pramod Shetty, Robert Jan Meijer, Jude A. Osara, Piet M. Lugt
Summary: This article presents a new method for measuring the film thickness in a rolling bearing and investigates the impact of speed on the film thickness.
TRIBOLOGY TRANSACTIONS
(2022)
Article
Engineering, Multidisciplinary
Fuchuan Zeng, Yiming Li, Yuhang Jiang, Guiqiu Song
Summary: A study proposes an online transfer learning method to accurately predict the remaining useful life of specified bearings by establishing a deep learning model and fine-tuning parameters using unlabeled data. The effectiveness and superiority of the proposed method are verified in transfer prognostics tasks of bearings through case studies.
Article
Engineering, Mechanical
L. Darul, T. Touret, C. Changenet, F. Ville
Summary: This study presents a theoretical analysis of power losses in an oil-jet lubricated deep groove ball bearing. The model focuses on the physics of unloaded rolling elements and aims to solve the problem of estimating dissipation sources in the absence of applied load. The model is compared with global power loss models and shows that unloaded rolling elements can contribute up to 40% of the losses with a 5% applied radial load.
TRIBOLOGY TRANSACTIONS
(2023)
Article
Engineering, Mechanical
Pradeep K. Gupta, Howard G. Gibson
Summary: The study presents real-time dynamic modeling of cryogenic ball bearings with consideration of thermal coupling, based on experimentally measured traction behavior. The research demonstrates that under stable conditions, the temperature field of the bearing can approach the operating value, indicating the effectiveness of dynamic simulation with thermal interactions.
JOURNAL OF TRIBOLOGY-TRANSACTIONS OF THE ASME
(2021)
Article
Engineering, Mechanical
Chao Zhao, Risheng Long, Yimin Zhang, Yibing Wang, Yueyong Wang
Summary: In this study, three types of vein-bionic textures were designed on the raceways of cylindrical roller thrust bearings using a fiber laser marking system. The effects of different veins and vein-structure characteristics on the tribological behavior of vein-bionic textured bearings were investigated. The results showed that the original vein-bionic pattern inspired by the Ash had the best friction-reducing performance, while the texture with the no-chief vein obtained by Clausena lansium had the best wear resistance.
TRIBOLOGY INTERNATIONAL
(2022)
Article
Engineering, Mechanical
Shuai Gao, Steven Chatterton, Lorenzo Naldi, Paolo Pennacchi
Summary: Rolling elements in rolling element bearings should continuously roll on raceways for pure rolling, but skidding or over-skidding may occur with improper loading and lubrication, especially in low-load roller bearings. An empirical study shows the inaccuracy of theoretical values for determining slipping of rolling elements, and proposes a more accurate KH-THD model that considers thermal effects for large-scale industrial bearings.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2021)
Article
Engineering, Mechanical
Vasilios Bakolas, Philipp Roedel, Oliver Koch, Michael Pausch
Summary: This article discusses a methodology to estimate the energy losses of specific bearing types on a global scale and proposes a method for calculating the potential energy efficiency of newer designs.
TRIBOLOGY TRANSACTIONS
(2021)
Article
Engineering, Mechanical
Wyatt Peterson, Thomas Russell, Farshid Sadeghi, Michael Tekletsion Berhan
JOURNAL OF TRIBOLOGY-TRANSACTIONS OF THE ASME
(2020)
Article
Engineering, Mechanical
Kushagra Singh, Farshid Sadeghi, Thomas Russell, Steven J. Lorenz, Wyatt Peterson, Jaret Villarreal, Takumi Jinmon
Summary: This paper presents a partitioned fluid-structure interaction (FSI) solver to model elastohydrodynamic lubrication (EHL) of line contacts. The FSI model uses the multiphysics simulation software Ansys and employs finite volume method (FVM) and finite element method (FEM) to determine the interaction between fluid and solid components and structural response. By removing any assumptions relative to the Reynolds equation, the model offers a detailed understanding of EHL contacts.
JOURNAL OF TRIBOLOGY-TRANSACTIONS OF THE ASME
(2021)
Article
Engineering, Mechanical
Wyatt Peterson, Thomas Russell, Farshid Sadeghi, Michael Tekletsion Berhan
Summary: Experimental and simulation studies have shown that lubrication conditions and bearing types have a significant impact on fluid drag losses, while bearing cage design has a minimal impact on this aspect.
TRIBOLOGY INTERNATIONAL
(2021)
Article
Engineering, Mechanical
Thomas Russell, Farshid Sadeghi, Wyatt Peterson, Saeed Aamer, Ujjawal Arya
Summary: This study introduces a novel experimental test rig for investigating friction between a ball and cage of a deep groove ball bearing. Results show that the friction performance of different cage types is related to the shape of the lubricating film, and friction coefficients increase with speed and decrease with applied load for all four cage varieties.
TRIBOLOGY TRANSACTIONS
(2021)
Article
Engineering, Mechanical
Abbas Shafiee, Thomas Russell, Farshid Sadeghi, Matthew G. Wilmer
Summary: The objective of this study was to investigate the performance of a spherical roller bearing under different loading and speed conditions. A dynamic model was developed and validated, and an adaptive slicing method was used to optimize calculations. The study found that roller skew increases with inner race speed, while roller tilt remains constant. Axial load also affects skew and tilt angles.
JOURNAL OF TRIBOLOGY-TRANSACTIONS OF THE ASME
(2022)
Article
Engineering, Mechanical
Ujjawal Arya, Farshid Sadeghi, Benjamin Conley, Thomas Russell, Wyatt Peterson, Andreas Meinel
Summary: The objectives of this investigation were to experimentally examine the cage motion and ball-cage contact forces for an angular contact ball bearing operating under various load and speed combinations. Experimental results showed that high inner race speeds and high axial loads developed the smallest and most circular cage whirl motions, and the contact forces between the ball and cage pocket increased linearly with increased race speeds. The findings from this investigation can be used to predict the correlation between ball-cage contact forces and race speeds, and identify key parameters influencing stable cage motion during bearing operation.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART J-JOURNAL OF ENGINEERING TRIBOLOGY
(2022)
Article
Engineering, Mechanical
Thomas Russell, Abbas Shafiee, Benjamin Conley, Farshid Sadeghi
Summary: The study aimed to use thin film pressure sensors to evaluate pressure distribution between rolling element bearings and a housing, with results applicable for validating bearing fit selection and housing design.
TRIBOLOGY INTERNATIONAL
(2022)
Article
Engineering, Mechanical
Thomas Russell, Farshid Sadeghi
Summary: This paper presents an experimental and analytical investigation into the lubrication of deep groove ball bearing cage pockets. A numerical model is proposed to predict the frictional torque based on the volume of oil present within the cage pocket. The study provides insights into the lubrication mechanism of deep groove ball bearings.
TRIBOLOGY INTERNATIONAL
(2022)
Article
Engineering, Mechanical
Busra Duran, Jerome Cavoret, David Philippon, Fabrice Ville, Arnaud Ruellan, Frank Berens
Summary: This study analyzes the changes in the physicochemical properties and tribological performances of gear transmission oils during field operation, finding differences from traditional engine oils.
TRIBOLOGY INTERNATIONAL
(2024)
Article
Engineering, Mechanical
Baocheng Liu, Hongsheng Chen, Jun Zhou, Jing Wang, Wenxian Wang, Xiaochun Chen, Sanxiao Xi
Summary: This study used fast hot pressing sintering to fabricate WC/AlCoCrFeNi2.1 metal matrix composites (MMCs). It was found that the addition of reinforced particles increased the microhardness, nanoindentation and wear resistance of the MMCs. During frictional processes, an oxide film formed, providing material protection, enhancing stability and reducing friction-induced losses.
TRIBOLOGY INTERNATIONAL
(2024)
Article
Engineering, Mechanical
Pradip Kumar Verma, Alok Singh
Summary: This study investigates the mechanical properties and wear resistance of CoMoMnNiV high entropy alloy reinforced aluminium matrix composite processed through stir-squeeze casting assisted with an ultrasonic transducer. The results show significant improvements in mechanical properties and wear resistance, with the composite containing 8 wt% HEA demonstrating the highest resistance to wear. Optical microscopy, SEM, and an optical profilometer were used for a thorough examination of the microstructure and worn surface.
TRIBOLOGY INTERNATIONAL
(2024)
Article
Engineering, Mechanical
Zhenghai Yang, Yingjian Song, Jinlong Jiao, Wenbo Li, Bao Shangguan, Yongzhen Zhang
Summary: This study investigated the friction, wear properties, and current-carrying properties of copper-graphite composites paired with brass C28000. The results showed that the current-carrying properties of the composite materials were excellent, but their wear rate was the main limiting factor. Furthermore, an increase in the thickness of the graphite layer led to an improvement in the uniformity of damage.
TRIBOLOGY INTERNATIONAL
(2024)
Article
Engineering, Mechanical
Moustafa Mahmoud Yousry Zaghloul, Karen Steel, Martin Veidt, Michael T. Heitzmann
Summary: This research evaluates and compares the impact of different material types on the tribological characteristics of Polyamide 6 composites, and finds that glass fiber-reinforced Polyamide 6 exhibits better friction and wear performance under high-pressure velocity factors.
TRIBOLOGY INTERNATIONAL
(2024)
Article
Engineering, Mechanical
Shaoqing Qin, Lida Zhu
Summary: In this paper, the surface and subsurface damage of laser assisted grinding CrCoNi medium entropy alloys were investigated using molecular dynamics simulations. The results showed that the application of laser energy can reduce cutting forces and minimize subsurface damage.
TRIBOLOGY INTERNATIONAL
(2024)
Article
Engineering, Mechanical
Kaikui Zheng, Youxi Lin, Tingzheng Lai, Chenghui Gao, Ming Liu, Zhiying Ren
Summary: The study investigated the use of waste foundry resin-bonded sand as a substitute for copper in resin-based brake material. It found that the waste sand was more favorable for improving the overall friction and wear properties of the material compared to copper. Waste sand benefited the material by forming a friction layer, leading to increased friction coefficient and stability. Brake material with 10-15% waste sand showed excellent heat-fade resistance.
TRIBOLOGY INTERNATIONAL
(2024)
Article
Engineering, Mechanical
Dayang Li, Fanhao Zhou, Yutong Gao, Kun Yang, Huimin Gao
Summary: This article introduces a continuous prediction model based on deep learning for predicting the power output of steam turbines. The model uses long short term memory (LSTM) method to develop a trend prediction model and optimizes the prediction model through feature selection method. Experimental results show that the model outperforms other models in terms of prediction performance.
TRIBOLOGY INTERNATIONAL
(2024)
Article
Engineering, Mechanical
Tomohiro Toyoda, Ryo Yasuike, Toshihiro Noda
Summary: In this study, a elasto-plastic constitutive model of friction incorporating the concept of superloading surface was developed based on the subloading friction model. The proposed model achieves a smooth transition of friction by describing the evolution rule of structure, treating the state with static friction coefficient larger than kinetic friction coefficient as the bulkiness of structure. The positive definiteness of the plastic multiplier, loading condition, and material parameters were derived, and the validity of the proposed model in accordance with the subloading-friction model was confirmed through a stick-slip simulation of a mass-spring system.
TRIBOLOGY INTERNATIONAL
(2024)
Article
Engineering, Mechanical
P. Balaji, B. Surya Rajan, K. Sathickbasha, P. Baskara Sethupathi, Deviga Magadevan
Summary: This study emphasizes the importance of using a variety of solid lubricants with different oxidation temperature regimes to enhance the tribological performance of brake pads.
TRIBOLOGY INTERNATIONAL
(2024)
Article
Engineering, Mechanical
Jian Ma, Yancong Liu, Javad Mostaghimi, Na Zhang
Summary: This paper investigates the influence of preparation strategies on the lubrication properties of surface textures. Three laser scanning strategies are proposed to achieve a sinusoidal textured surface, and the evolution of surface structure and chemical composition is discussed. The findings show that ridge structures enhance anti-wear properties but also increase the friction coefficient. However, the oil cover preparation method prevents the formation of ridges and improves wettability.
TRIBOLOGY INTERNATIONAL
(2024)
Article
Engineering, Mechanical
Mohammad Roostaei, Arvin Taghizadeh Tabrizi, Hossein Aghajani
Summary: In this research, the Al2O3/MoS2 nanocomposite coating layer was successfully applied on the surface of Ti-6Al-4 V alloy. The relation between the surface characteristics and wear resistance of the coating was studied using atomic force microscopy analysis and pin-on-disk wear test method. The results showed that the nanocomposite coating significantly reduced the wear rate and provided an equation to calculate the Lancaster coefficient.
TRIBOLOGY INTERNATIONAL
(2024)
Article
Engineering, Mechanical
Musa Bilgin, Sener Karabulut, Halil Karakoc, Yunus Kayir, Murat Sarikaya
Summary: This study investigates various methods to improve the machinability efficiency of Inconel 718 alloy while considering their effect on microstructural properties. The results show that hot+PMQL, hot+SiCNMQL, and hot+Al2O3-NMQL contribute significantly to the improvement of machinability characteristics. The EBSD analysis also reveals that a limited area is affected by heat in the hot machining environment and that the removal of the heated layer during milling process helps preserve the microstructure.
TRIBOLOGY INTERNATIONAL
(2024)
Article
Engineering, Mechanical
Q. Gao, Y. Fan, Y. G. Wu, J. L. Liu, J. Wang, L. Li
Summary: Fretting wear significantly affects the hysteresis behavior of the contact surface and leads to joint degradation. This study investigates the influence of harmonic normal force on the evolution of interface morphology and contact parameters with fretting wear. The results show that the harmonic normal force can significantly influence the hysteresis loop and the energy dissipation distribution on the contact surface.
TRIBOLOGY INTERNATIONAL
(2024)
Article
Engineering, Mechanical
Benjamin Weiland, Floriane Leclinche, Anis Kaci, Brigitte Camillieri, Betty Lemaire-Semail, Marie -Ange Bueno
Summary: This study presents a systematic approach to generating control signals for a tactile simulator that simulate the touch of textile fabrics. By using a friction modulation tactile surface and acquiring forces from real surfaces with artificial finger mimicking fingerprints, control signals are generated and processed in the frequency domain before sending them to the tactile stimulator. The study focuses on the potential benefits of incorporating fingerprint information in fabric simulations to achieve a more realistic tactile perception. A sensory analysis with 36 participants using the generated control signals showed better discrimination without fingerprint information.
TRIBOLOGY INTERNATIONAL
(2024)
