Article
Mechanics
Zhaolin Zheng, Haiou Xie, Xuedong Chen, Xuhui Liu, Wei Yang, Yong Xu, Wenbin Huang
Summary: In this study, the squeeze flow behavior of an upper convected Maxwell fluid between two rigid disks or spheres was investigated. It was found that the velocity field of the Maxwell squeeze flow between two disks is similar to that of a Newtonian fluid when the Deborah number is low. Based on the Newtonian fluid velocity field, the pressure distribution between two parallel disks was analyzed, and a theoretical model of normal squeeze force was developed. The same method was also used to analyze the interaction between two nearly contacting, arbitrary rigid spheres. Analytical expressions for the pressure distribution and normal squeeze force were obtained, which can be used in the contact model for discrete element simulation of wet particle systems with the Maxwell fluid.
Article
Engineering, Mechanical
S. Boedo, V. N. Santhanam
Summary: The optimal shape design of hydrodynamic axisymmetric spherical bearings under transient axisymmetric pure squeeze conditions has been investigated using genetic algorithms. The study found that the GA-based optimal designs yield significantly larger impulse values compared to random designs or optimal ellipsoidal geometries. A sample design application demonstrated that an optimal GA-inspired composite clearance specification can be constructed, providing better bearing performance and being less sensitive to deviations in clearance shape, load impulse, and viscosity variation compared to similar variations in the optimal ellipsoidal design.
TRIBOLOGY INTERNATIONAL
(2023)
Article
Engineering, Electrical & Electronic
Edoardo Gheller, Steven Chatterton, Andrea Vania, Paolo Pennacchi
Summary: This paper investigates the modeling of squeeze film dampers (SFDs) and highlights the key phenomena involved in their characterization, including oil film cavitation, air ingestion, and inertia. A numerical model based on the Reynolds equation is introduced and validated with experimental results. Different designs and configurations of the feeding and sealing system are considered, and an example of applying SFDs to a compressor rotor is proposed.
Article
Mathematics
Mo Sadique, Sapna Ratan Shah, Sunil Kumar Sharma, Sardar M. N. Islam
Summary: Synovial joints, with the help of synovial fluid, enable efficient mobility in the human body. Synovial fluid acts as a biological lubricant that reduces wear and friction on the articular cartilage. Understanding the lubricating properties and behavior of synovial fluid is crucial for maintaining joint health and preventing joint diseases.
Article
Engineering, Mechanical
Wenbin Zheng, Shiyuan Pei, Qingshan Zhang, Jun Hong
Summary: This study proposed a controllable clearance squeeze film damper that uses hydraulic pressure to adjust the radial clearance, achieving synchronous adjustment of the damper's performance under different operating conditions and significantly improving its performance.
TRIBOLOGY INTERNATIONAL
(2022)
Article
Engineering, Mechanical
Carmine Putignano, Angelo Campanale
Summary: Squeezing a lubricating film between viscoelastic solids has various applications in fields ranging from biomechanics to industrial engineering. By using an innovative numerical strategy, the study shows that pressure and film thickness depend on the material's viscoelastic relaxation, peaking at the two edges of the lubricated contact area, which deviates significantly from the classical elasto-hydrodynamic lubrication solution and highlights the importance of considering the actual viscoelastic rheology of the lubricated solids.
TRIBOLOGY INTERNATIONAL
(2022)
Article
Mechanics
S. Ramanarayanan, W. Coenen, A. L. Sanchez
Summary: This paper investigates the air flow induced by a rigid circular disk or piston vibrating harmonically near a parallel surface. It proposes a viscoacoustic analysis method to explore different flow regions and corresponding flow parameters. The analysis provides a unified theory for axisymmetric squeeze films and offers a simplified parametric description of the time-averaged repulsion/attraction force, which may have value in applications such as non-contact fluid bearings and robot locomotion.
JOURNAL OF FLUID MECHANICS
(2022)
Article
Engineering, Mechanical
Binbin Su, Xianghe Zou, Lirong Huang
Summary: This study investigates the lubrication properties of a hexagonal patterned surface inspired by the epidermis structure of a tree frog's toe pad and explores the working mechanism of hexagonal micropillars in acquiring high adhesive and friction in wet contacts. The results reveal that higher pressure is longitudinally distributed across individual hexagonal pillars, with a pressure peak at the center. Increasing density and decreasing channel depth or initial film thickness improves the squeezing pressure magnitude. Lower pressure is generated in interconnected channels, reducing the load carrying capacity. The introduction of microchannels downscales the total mass flow rate.
INDUSTRIAL LUBRICATION AND TRIBOLOGY
(2022)
Article
Mechanics
Elaheh Esmaeili, Paul Grassia, Carlos Alejandro Torres Ulloa
Summary: This study examines the squeeze film flow of a viscoplastic Bingham fluid between non-parallel plates. It investigates the changes in film thickness over time, the reversal of flow direction and the effects of different factors on the final steady film thickness for both parallel and non-parallel plate configurations.
JOURNAL OF NON-NEWTONIAN FLUID MECHANICS
(2022)
Article
Multidisciplinary Sciences
Yanzhong Wang, Kai Yang, Xiaomeng Chu, Wen Tang, Changyong Huang
Summary: An engineering calculation model is introduced to analyze point-contact elastohydrodynamic lubrication of spiral bevel gears, revealing the transient lubrication characteristics and film thickness variations during the meshing process.
SCIENTIFIC REPORTS
(2021)
Article
Acoustics
Jingyue Wang, Ning Liu, Haotian Wang, Lixin Guo
Summary: Based on a planetary gear transmission system considering the coupling effects of friction and elastohydrodynamic lubrication, a torsional dynamic model incorporating various factors such as friction, oil film, time-varying meshing stiffness, meshing damping, and gear backlash is established. The numerical results show that the system exhibits rich nonlinear dynamic characteristics such as short-period motion, long-period motion, and chaotic motion as the excitation frequency increases. The increase of lubricant viscosity, sun-planet backlash, and planet-ring backlash each have distinct effects on the system's dynamic behavior, influencing the occurrence of chaotic motion, periodic motion, and bifurcation characteristics.
JOURNAL OF LOW FREQUENCY NOISE VIBRATION AND ACTIVE CONTROL
(2021)
Article
Engineering, Mechanical
S. Boedo
Summary: This study investigates the impact of surface ellipticity on self-acting partial arc journal bearings under steady load and sinusoidal oscillation, taking into account mass conserving cavitation. The computational efficiency is improved by using a generalized Warner bearing (GWB) formula. The results demonstrate that an elliptical sleeve can significantly improve bearing performance at small oscillation amplitudes commonly found in practical applications, and a fully hydrodynamic lubrication regime can be established through the wearing-in process of the sleeve surface.
TRIBOLOGY INTERNATIONAL
(2022)
Article
Engineering, Mechanical
Guotao Zhang, Zhen Ma, Yanguo Yin, Xicheng Wei
Summary: This paper investigates the unsteady seepage characteristics of lubricant stored in hydrogel under different initial permeability. The study finds that the distribution of permeability depends on the deformation of hydrogel. The normal velocity and pressure gradient on the hydrogel surface exhibit diffusion, fluctuation, and stabilization processes. The change in velocity is driven by the internal cause of the normal pressure gradient. As the initial permeability increases, the seepage velocity significantly increases. A higher initial permeability leads to a higher exudation rate of hydrogel initially, but it is unsustainable. Therefore, it is necessary to design the initial permeability reasonably considering the instantaneous seepage rate and long-term lubrication.
TRIBOLOGY INTERNATIONAL
(2022)
Article
Engineering, Multidisciplinary
Weitao Chen, Hongtai Shi, Junwei Li, Siyu Chen
Summary: This research adopts squeeze film dampers as damping devices to suppress excessive vibration of the spiral bevel gear rotor system. The theoretical analysis and experimental results show that the squeeze film dampers can effectively reduce the vibration amplitude of the system at high speeds.
APPLIED MATHEMATICAL MODELLING
(2023)
Article
Chemistry, Physical
Rong-Guang Xu, Yuan Xiang, Gunan Zhang, Qi Rao, Yongsheng Leng
Summary: This study investigated the phase transition and solvation force oscillation behavior of a simple argon liquid film confined between two solid surfaces using LVMD simulations. The results showed that the formation, climb, and annihilation of Frank partial dislocations during the squeeze-out process under compression led to force hysteresis.
Article
Engineering, Aerospace
Joaquin Zueco, Luis Maria Lopez-Gonzalez
Review
Thermodynamics
Sahin Ahmed, Joaquin Zueco, Luis Maria Lopez-Gonzalez
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2017)
Article
Thermodynamics
Joaquin Zueco, Sahin Ahmed, Luis Maria Lopez-Gonzalez
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2017)
Article
Thermodynamics
Sahin Ahmed, Joaquin Zueco, Luis M. Lopez-Gonzalez
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2017)
Article
Multidisciplinary Sciences
Joaquin Zueco, Sahin Ahmed, L. M. Lopez-Ochoa
ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING
(2014)
Article
Engineering, Chemical
Sahin Ahmed, Joaquin Zueco, L. M. Lopez-Ochoa
CHEMICAL ENGINEERING COMMUNICATIONS
(2014)
Article
Computer Science, Interdisciplinary Applications
Joaquin Zueco
COMPUTER APPLICATIONS IN ENGINEERING EDUCATION
(2013)
Article
Computer Science, Interdisciplinary Applications
Joaquin Zueco
COMPUTER APPLICATIONS IN ENGINEERING EDUCATION
(2013)
Article
Biology
O. Anwar Beg, J. Zueco, M. Norouzi, M. Davoodi, A. A. Joneidi, Assma F. Elsayed
COMPUTERS IN BIOLOGY AND MEDICINE
(2014)
Article
Thermodynamics
Joaquin Zueco, L. M. Lopez-Ochoa
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2013)
Article
Thermodynamics
Veronica Rubio, Joaquin Zueco
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2013)
Review
Thermodynamics
Veronica Rubio Hernandez, Joaquin Zueco
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2013)
Article
Mechanics
P. Eguia, J. Zueco, E. Granada, J. Collazo
Article
Thermodynamics
Joaquin Zueco, Damian Lopez-Asensio, F. J. Fernandez, Luis M. Lopez-Gonzalez
APPLIED THERMAL ENGINEERING
(2020)
Article
Thermodynamics
Joaquin Zueco, Sergio Ayala-Minano
INTERNATIONAL JOURNAL OF EXERGY
(2020)
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)