Article
Engineering, Mechanical
Che Wang, Jianhua Wu, Junming Cheng, Shuai Zhang, Kang Zhang
Summary: A coupled model of the rotor, bearing, and bearing frame was developed to study the reliability of a scroll-type compressor operating at a lower frequency. Experimental results confirmed that using a relief groove on the bearing frame can improve lubrication and prevent severe wear. The simulation results showed an increase in minimum film thickness and a decrease in maximum oil film pressure when a circumferential relief groove is utilized.
TRIBOLOGY INTERNATIONAL
(2022)
Article
Engineering, Mechanical
Navin Kumar, Akash Shukla, Sanjay Bansal, Chandra B. Khatri, Gannath D. Thakre, Saurabh K. Yadav, Satish C. Sharma, Suraj P. Harsha
Summary: This paper presents an experimental and theoretical investigation on the performance behaviour of twin-groove elliptical white metal hydrodynamic journal bearings used in steam turbines. Experimental results on coefficient of friction, lubricant inlet temperature, load carrying capacity, journal displacement, and weight loss were correlated with theoretical results obtained using finite element method and JFO boundary condition.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART J-JOURNAL OF ENGINEERING TRIBOLOGY
(2021)
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
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.
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
Anil Dhanola, H. C. Garg
Summary: This study investigates the influence of thermo-elasto effects on the performance parameters of journal bearings lubricated with biodegradable nanolubricants. It shows that deviations in performance parameters due to thermo-elasto effects vary for different power law indexes, and that biodegradable nanolubricants can enhance load carrying capacity and friction force.
JOURNAL OF THE BRAZILIAN SOCIETY OF MECHANICAL SCIENCES AND ENGINEERING
(2021)
Article
Engineering, Mechanical
Guanying Xing, Song Xue, Jiacheng Han, Huaiyu Zuo, Run Hu, Zhengkai Tu, Xiaobing Luo
Summary: This paper studies the flow behavior of magnetorheological fluid in the clearance and its influence on the flow object, and proposes a flow dynamics and strain distribution model to predict the pressure distribution and lubrication characteristics.
TRIBOLOGY INTERNATIONAL
(2023)
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, Mechanical
Huihui Feng, Shuyun Jiang, Yanqin Shang-Guan
Summary: This study investigates the effects of groove texture on high-speed, water-lubricated hydrodynamic journal bearings through three-dimensional computational fluid dynamic analyses. It is found that groove texture can significantly improve load capacity, especially at smaller eccentricity ratios and higher rotary speeds. The load capacity is influenced by groove depth, width, and length, while friction force is slightly impacted by groove texture.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART J-JOURNAL OF ENGINEERING TRIBOLOGY
(2021)
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
Chemistry, Analytical
Yulong Jiang, Bo Liang, Zhongwen Huang, Zhenqian Chen, Bo Xu
Summary: This paper focuses on the flow and thermal characteristics of the lubricant film in the micro clearance of a hydrodynamic journal bearing at high rotating speed. The results show that with the rise of eccentricity or length diameter ratio, the maximum peaks of pressure, temperature and heat dissipation are rapidly increased, the cavitation is aggravated, and the flow rate is accelerated in different extent.
Article
Engineering, Mechanical
Bin Wei, Yinghou Jiao
Summary: This study investigates the impact of semi-ellipsoid texture on the load capacity and maximum oil film temperature of tilting pad journal bearings. The research shows that surface texture can improve bearing performance, but few studies have focused on tilting pad journal bearings. A thermal elastohydrodynamic model for tilting pad journal bearings was developed and solved using the finite difference method. The results of the model align well with simulation results from MADYN 2000 software, validating the model's accuracy. The effects of texture distribution, depth, radius, and density on the characteristics of tilting pad journal bearings were analyzed and compared with untextured bearings. The findings demonstrate that texture parameters can significantly impact the steady-state behavior of tilting pad journal bearings. These findings provide valuable insights for the design of tilting pad journal bearings.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART J-JOURNAL OF ENGINEERING TRIBOLOGY
(2023)
Article
Engineering, Mechanical
Yonghun Yu, Junho Suh
Summary: By developing a three-dimensional thermo-elastic model and conducting numerical analysis and verification, this study investigated the interaction of mechanical and thermal deformation in steady-state rolling contact. The experimental results confirmed that under severe rolling conditions, the thermal effect significantly changes the behavior of the contact interface.
Article
Engineering, Mechanical
Zhou Sun, Siyu Chen, Zehua Hu, Duncai Lei
Summary: Thermal effects play a crucial role in the failure of gear systems, impacting the system motion from periodic to chaotic with temperature increase. Proper backlash and bearing type can mitigate the effects of temperature on the system.
NONLINEAR DYNAMICS
(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)