Article
Engineering, Mechanical
Stephan Andre Bohme, Gabor Szanti, Joni Keski-Rahkonen, Tami Komssi, Jose Garcia Santaella, Alexei Vinogradov
Summary: This study evaluates the accuracy of the proposed methodology by comparing it to load-controlled bevel gear tests and develops a method capable of differentiating and accurately predicting pitting and subsurface fatigue.
ENGINEERING FAILURE ANALYSIS
(2022)
Article
Mechanics
Ali Kecici, Ali Unuvar
Summary: The study found that by designing asymmetric gear mechanisms with different pressure angles and profile crowning, it is possible to improve the load bearing capacity, performance, life, efficiency, and reliability of gears. Compared to symmetric gears, asymmetric gear design and profile crowning can effectively improve the working performance of gears.
Article
Engineering, Mechanical
Thomas Hagemann, Huanhuan Ding, Esther Radtke, Hubert Schwarze
Summary: In recent years, the application of sliding planet gear bearings in wind turbine gearboxes has become more common. Research has shown that radial clearance and axial crowning are important design parameters to reduce maximum pressures at the bearing edges. Additionally, a detailed analysis of the gear mesh load distribution is required to characterize bearing operating behavior at part-load.
Article
Chemistry, Multidisciplinary
Miao Tian, Xiaoming Su, Changzheng Chen, Wenjie An
Summary: This study proposes a local enhancement temporal convolutional network model with multistage degenerate distribution matching based on domain adaptation, which can extract degradation features of wind turbine generator bearings and accurately predict their remaining service life under composite working conditions.
APPLIED SCIENCES-BASEL
(2023)
Review
Engineering, Electrical & Electronic
Rafae Tuiran Villalba, Heriberto Maury Ramirez, Hector Aguila Estrada
Summary: Vibrations in mechanical power transmission elements such as gears and bearings play a significant role in the dynamic behavior of the system. Current research primarily focuses on measurements and signal processing methods, with fewer studies addressing the issue from the design stage. Important findings highlight the importance of considering mechanical vibrations in the design phase.
Article
Engineering, Mechanical
Stanislaw Pabiszczak, Michal Kowal
Summary: The efficiency of a novel eccentric rolling transmission was investigated in this article, and an efficiency model was developed to predict the transmission's efficiency. The study found that the main power losses occurred in the bearings, rather than losses associated with friction between the main components.
MECHANISM AND MACHINE THEORY
(2022)
Article
Chemistry, Multidisciplinary
Jung-Mo Jung, Yoshiki Matsushita, Seonghun Kim
Summary: This study aimed to reduce fuel consumption in the fishing industry by changing the arrangement of gears. The research found that the fluid drag of the float and ground gear was highest at an attack angle of 60 degrees, regardless of shape, size, and flow velocity. Frictional drag of the ground gear was greater when the axis of rotation had a small attack angle in the towing direction. The study proposed a gear design that showed a 1.2% drag reduction and an estimated 0.8% improvement in fuel efficiency per haul.
APPLIED SCIENCES-BASEL
(2022)
Article
Engineering, Mechanical
Thomas Hagemann, Huanhuan Ding, Esther Radtke, Hubert Schwarze
Summary: The study investigates the impact of structure deformation on sliding planet gear bearings in wind turbine gearboxes, focusing on developing a time-efficient procedure for thermo-elasto-hydrodynamic analysis, understanding specific deformation characteristics, and investigating the modified operating behavior of the bearing due to structure deformation. The results show an improvement in predicted operating conditions, a decrease in peak load, and the essential nature of considering structure flexibility for quantitative assertions on load distributions, wear phenomena, and component interaction in sliding planet gear bearing analysis.
Article
Polymer Science
Christoph Herzog, Michael Wolf, Dietmar Drummer
Summary: The wear behavior of PBT-steel gear sets under temporarily changed load has been investigated using an in situ gear test rig. The results show that the applied load spectrum determines the resulting tooth flank wear, and the load history also plays an important role in the wear behavior.
Article
Automation & Control Systems
Jing Deng, Chuang Jiang, Xiaozhong Deng, Saisai Liu, Shaohang Liu
Summary: This study established a hot rolling model and conducted numerical analysis to investigate the influence of various technical parameters on the metal streamline of spiral bevel gears. Experimental observations of the microstructure and morphology of the gear teeth after hot rolling were made using an electron microscope. The results demonstrate that the metal streamline obtained through hot rolling is parallel to the tooth profile, leading to improved bending fatigue and contact fatigue strength of spiral bevel gears.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2022)
Article
Engineering, Electrical & Electronic
Huu Loc Nguyen, Le Thanh Duy
Summary: This paper investigates the influence of various parameters on gear drive efficiency through experimental models and design methods. The results can be used to select and design gear transmission efficiency, as well as provide recommendations for parameter selection to improve gear transmission efficiency.
Review
Engineering, Mechanical
Fernando Jose Lopez-Urunuela, Beatriz Fernandez-Diaz, Francesco Pagano, Ainara Lopez-Ortega, Bihotz Pinedo, Raquel Bayon, Josu Aguirrebeitia
Summary: This paper reviews the phenomenon of White Etching Cracks (WEC) which are subsurface crack networks surrounded by microstructural alterations that lead to premature failures of wind turbine gearbox bearings (WTGB). The study observes that in the majority of tests where WEC is generated, three drivers usually appear and act synergistically: non-metallic inclusions, sliding, and hydrogen.
INTERNATIONAL JOURNAL OF FATIGUE
(2021)
Article
Chemistry, Multidisciplinary
Francesco Natili, Alessandro Paolo Daga, Francesco Castellani, Luigi Garibaldi
Summary: The study focuses on the supervision of wind turbine bearings and their integration into industrial practice. By analyzing historical SCADA data and using Support Vector Regression, the study aims to differentiate healthy and damaged wind turbines, with the use of a Novelty Index for identifying the damaged ones.
APPLIED SCIENCES-BASEL
(2021)
Article
Engineering, Mechanical
Fangyan Zheng, Jun Zhang, Ligang Yao, Rulong Tan
Summary: Recent studies have shown that proper cutter modification can enhance the wear resistance of gears, reducing wear and increasing the gear's lifespan.
Article
Energy & Fuels
Xiaojing Wan, Wenlei Sun, Kun Chen, Xiaodong Zhang
Summary: A method for monitoring the performance degradation and early fault identification of wind turbine bearings using multi-scale weighted permutation entropy and local linear embedding algorithm is proposed in this study. The degradation index is quantitatively evaluated by four evaluation parameters, and the effectiveness and accuracy of the index are validated through experimental data.
Article
Engineering, Mechanical
V Ripard, D. Goncalves, F. Ville, J. H. O. Seabra, J. Cavoret, P. Charles
Summary: The study analyzed lubrication starvation using the Starvation Degree parameter through tests with different operating conditions and types of greases to prevent damage such as scuffing.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART J-JOURNAL OF ENGINEERING TRIBOLOGY
(2022)
Article
Engineering, Mechanical
Justino A. O. Cruz, Pedro M. T. Marques, Jorge H. O. Seabra, Jorge D. Castro
Summary: This study investigates the power loss in a real axle box gear transmission under no-load operating conditions. The research analyzes the contributions of different components and develops a numerical model for predicting power loss. The results highlight the significant impact of the tapered roller bearings in the overall power loss of the axle box.
JOURNAL OF TRIBOLOGY-TRANSACTIONS OF THE ASME
(2022)
Review
Engineering, Mechanical
Victor Roda-Casanova, Carlos M. C. G. Fernandes
Summary: This paper provides a detailed background and methods of theoretical models that affect the temperature rise phenomena of polymer gears, including the methods suggested by Hachmann, Takanashi, and Mao. Conclusions are drawn and recommendations for application are provided through numerical examples and comparison with experimental results.
MECHANISM AND MACHINE THEORY
(2022)
Article
Biochemistry & Molecular Biology
Margarida Martins Quezada, Helena Salgado, Andre Correia, Carlos Fernandes, Patricia Fonseca
Summary: This investigation aims to determine the effect of the same polishing protocol on the surface roughness of different resins obtained by different processing techniques. Manual polishing generally results in lower Ra values compared to mechanized polishing, except for the injected molded resin. Differences in surface roughness values can be attributed to the inherent characteristics of the resin and the respective processing techniques.
Article
Biochemistry & Molecular Biology
Helena Salgado, Ana T. P. C. Gomes, Ana S. Duarte, Jose M. F. Ferreira, Carlos Fernandes, Maria Helena Figueiral, Pedro Mesquita
Summary: This study tested the antimicrobial activity and surface roughness of a graphene-enhanced dental resin against Candida albicans and Streptococcus mutans. The increase in graphene concentration resulted in increased surface roughness. Graphene was effective in inhibiting the growth and adhesion of C. albicans and S. mutans.
Article
Dentistry, Oral Surgery & Medicine
Manuel Sampaio-Fernandes, Paulo Julio Almeida, Paulo Rocha Almeida, Jaime Portugal, Ramiro Carneiro Martins, Maria Helena Figueiral
Summary: This in vitro study evaluated the surface roughness of different types of ceramic after finishing and polishing, and compared three different polishing techniques. The results showed that the universal polishing set yielded the best results for certain ceramic surfaces, but no significant differences were found for others.
REVISTA PORTUGUESA DE ESTOMATOLOGIA MEDICINA DENTARIA E CIRURGIA MAXILOFACIAL
(2022)
Article
Dentistry, Oral Surgery & Medicine
Margarida Sampaio-Fernandes, Claudio Ferreira Jr, Susana Joao Oliveira, Ramiro Carneiro Martins, Joao Carlos Sampaio-Fernandes, Maria Helena Figueiral
Summary: This study evaluated and compared the surface roughness, contact angle, and C. albicans adhesion in three materials for removable denture bases. The results showed that polymethylmethacrylate exhibited the best properties in terms of surface roughness, contact angle, and C. albicans adhesion, surpassing the thermoplastic materials.
REVISTA PORTUGUESA DE ESTOMATOLOGIA MEDICINA DENTARIA E CIRURGIA MAXILOFACIAL
(2022)
Article
Engineering, Mechanical
J. C. Poletto, C. M. C. G. Fernandes, L. Y. Barros, P. D. Neis, K. Pondicherry, D. Fauconnier, J. H. O. Seabra, P. De Baets, N. F. Ferreira
Summary: Visual inspection for identifying gear failure modes is subjective and biased, so it is important to design objective methods. This study used white light interferometry to measure the 3D topography of gears affected by different wear modes. Various roughness parameters were evaluated and a new parameter called surface motion orientation (Smo) was proposed. The combination of these parameters allowed for an objective classification of gear failure modes.
Article
Chemistry, Physical
Nuno Miguel Ferreira, Maria Vila Pouca, Carlos Fernandes, Jorge Seabra, Grzegorz Lesiuk, Marco Parente, Abilio Jesus
Summary: This study used numerical simulation models to predict deformations and residual stresses in the gear repair process by directed energy deposition (DED). The model was validated using a case study from the National Institute of Standards and Technology (NIST), and a parametric study was conducted to examine the influence of DED parameters. The results demonstrated the model's accuracy in predicting deformations and residual stresses, and provided insights into the effects of printing parameters on the process.
Article
Engineering, Mechanical
James D. S. Hooton, David E. P. Goncalves, Carlos M. C. G. Fernandes
Summary: This study investigates the effectiveness of a hybrid polymer gear concept through experiments and finite element analysis. The experimental results show that the hybrid gear concept improves heat evacuation and potentially increases load-carrying capacity. The numerical model is validated by comparing the experimental and analytical results. The study also analyzes the influence of interference fit on contact pressure and thermal conductance, providing insights for optimizing heat dissipation in practical applications.
MECHANISM AND MACHINE THEORY
(2023)
Article
Engineering, Mechanical
Joao D. M. Marafona, Pedro M. T. Marques, Ramiro C. Martins, Jorge H. O. Seabra
Summary: In many gear stiffness models, the single tooth pair stiffness is often approximated as a symmetric curve with a parabolic shape along the contact path. However, this approach ignores the asymmetry and approximates the amplitude. In this study, a new analytical expression for the single tooth pair stiffness is proposed, based on a parabolic approximation of the tooth pair structural stiffness, considering the asymmetry, relative amplitude, and maximum value as a function of gear parameters. The accuracy and applicability of the proposed method are validated using a random sample of gears, showing the importance of including asymmetry and the improvements achieved with the new parameters.
MECHANISM AND MACHINE THEORY
(2023)
Article
Engineering, Mechanical
Joao D. M. Marafona, Pedro M. T. Marques, Stephane Portron, Ramiro C. Martins, Jorge H. O. Seabra
Summary: There is a lack of comprehensive gear parametric studies in the literature. This work developed a fast and accurate gear mesh stiffness model and conducted a parametric study on tooth pair structural stiffness asymmetry. The study found that tooth pair structural stiffness asymmetry has significant effects on gear mesh stiffness and dynamic behavior.
MECHANISM AND MACHINE THEORY
(2023)
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)
