Article
Engineering, Mechanical
Juan Guo, Guo Xiang, Jiaxu Wang, Yankui Song, Jianlin Gai, Haiming Dai
Summary: This paper introduces a method of one-side profile modification for reducing the edge wear caused by journal defection in misaligned journal bearings. The effectiveness of the modification is confirmed through numerical calculations. The results indicate that the reasonable design of one-sided profile modification can increase the minimum film thickness at the edge of the bearing and reduce rough contact, thus improving the anti-wear performance of the misaligned journal bearing.
SURFACE TOPOGRAPHY-METROLOGY AND PROPERTIES
(2022)
Article
Thermodynamics
Zhimin Wang, Guoguang Jin, Zhan Wei, Dong Liang, Boyan Chang, Yang Zhou
Summary: This study proposes an approach to analyze and quantify the irregular wear effect of a planar multi-body mechanical system with multi-clearances. Using the classical planar four-bar linkage as an example, the mechanism of irregular wear effect in multi-body systems with multi-clearances is studied. The system dynamic equation is established using the Lagrange multiplier method, and the contact force and friction during contact collision are modeled using the Lankarani-Nikravesh (L-N) nonlinear contact force and LuGre models. A wear depth prediction model for multi-clearance joints is built based on Archard's equation. The study comprehensively investigates the influence of crank speed, clearance number, clearance position, and clearance size on the wear effect of multi-clearance systems.
ADVANCES IN MECHANICAL ENGINEERING
(2022)
Article
Engineering, Mechanical
Hui Xi, Tian Ran Lin, Fengcai Wang, Ye Zhou, Guifei Wang, Peng Liu
Summary: A contact probability model of an angular ball bearing was developed using multi-body dynamics and a spherical grid division method. The model was used to analyze the contact probability of a ball surface under different loading conditions. Results showed that axial load plays a decisive role in the stable distribution of contact probability of the ball under various load combinations.
MECHANISM AND MACHINE THEORY
(2021)
Article
Materials Science, Multidisciplinary
Lai Hu, Jun Zha, Dongfeng Wang, Yaolong Chen
Summary: In this study, different manufacturers' precision bearings, thin-walled bearings, and rail bearings were compared and analyzed for their element content, grain size, grain boundary morphology, metamorphic layer, hardness, and fatigue life. The study deduced the theoretical model for bearing service life and discussed the dimensions of raw materials, processing technology, and service life. The results showed that bearings from German and Japanese manufacturers had better control in heat treatment and machining, while Chinese and American manufacturers had their own advantages in service life. With an increase in torque, friction and wear increased, leading to a decrease in wear resistance and fatigue life. An increase in the bearing raceway hardness resulted in decreased wear amount and improved wear resistance and fatigue life. Additionally, a decrease in the metamorphic layer in the bearing raceway led to increased compressive stress, reduced wear amount, and improved wear resistance and fatigue life. The analysis of this study aims to provide product quality control methods for bearing enterprises.
JOURNAL OF MATERIALS SCIENCE
(2023)
Article
Mechanics
Abhishek Chatterjee, Hamid Ghaednia, Alan Bowling, Matthew Brake
Summary: When hard objects collide, there are abrupt changes in velocities characterized by large contact forces over small time durations. Current analysis models typically ignore time duration and deformations at contact points, focusing instead on impulse-momentum relationships to describe system velocities. This study aims to reformulate these models to consider small deformations at contact points and determine forces during collision events.
MULTIBODY SYSTEM DYNAMICS
(2021)
Article
Engineering, Electrical & Electronic
Enrico Ciulli, Paola Forte, Flavio Antonelli, Roberto Minelli, Daniele Panara
Summary: This paper describes a test rig and methodology for determining the stiffness of a TPJB ball-and-socket pivot. The preliminary results show significant differences between experimental and analytical results for the conformal contact of the ball-and-socket.
Article
Mathematics, Interdisciplinary Applications
Edouard Izard, Haithem Ben Hamouda, John Vande Voorde
Summary: This work presents a discrete element model (DEM) to investigate high-stress impact-abrasion mechanisms on steel plates with the use of abrasive granite particles. The simulations showed good qualitative results with experimental observations, and revealed the exponential decay of large contact forces in a dynamic and loose granular system. Additionally, it was found that the probability density functions of normal and tangential abrasion energies follow exponential decays above their mean values, a phenomenon observed for the first time.
COMPUTATIONAL PARTICLE MECHANICS
(2021)
Article
Chemistry, Physical
Alexander Mironov, Iosif Gershman, Eugeniy Gershman, Pavel Podrabinnik, Ekaterina Kuznetsova, Pavel Peretyagin, Nikita Peretyagin
Summary: The research investigated the potential relations of tribological characteristics of aluminum antifriction alloys with their compositions and mechanical properties, showing that there is no definitive correlation between tribological behavior and mechanical properties. It was found that doping tin over 6% is excessive and the seizure load of the alloys increases with the magnesium content. Alloys with higher wear rates contain one order less magnesium and tin in their secondary structures.
Article
Mechanics
Rajasekhara Reddy Mutra, J. Srinivas
Summary: This paper presents an optimization-based methodology to predict bearing coefficients using measured dynamic responses in a rotor supported on floating ring bearings. The unknown bearing stiffness and damping coefficients of the ideal rotor system are identified by predicting the deviations in frequency response amplitudes. The approach is relatively simple and can be applied to any kind of bearings.
Article
Computer Science, Interdisciplinary Applications
Jianli Cong, Xue Yan, Rong Chen, Mingyuan Gao, Boyang An, Huiyue Tang, Yuan Wang, Ping Wang
Summary: Previously, electronic straightedges with a length of 1 m were commonly used to measure rail joints, but this study developed a rail measurement trolley with a measurement wavelength of up to 3 m. By conducting field measurements on a metro line, the waveform data of 4340 rail joints were obtained. Through dimensionality reduction and clustering analysis, different types of rail joints were identified, and the concept of rail joint triangles and five shape-based features were proposed. The analysis showed that a 3-m waveform provides more essential information about rail joints compared to a 1-m waveform. This is significant for future research on rail joint dynamics and profile grinding.
COMPUTER-AIDED CIVIL AND INFRASTRUCTURE ENGINEERING
(2023)
Article
Engineering, Mechanical
Ebrahim Tofighi-Niaki, Mir Saeed Safizadeh
Summary: This paper investigates the effects of wear-induced geometric imperfections of tilting pad journal bearings (TPJBs) on the dynamic behavior of the system. A novel tribo-dynamic model is proposed for a flexible rotor-worn TPJB to assess the effects of bearing wear progression on rotor-TPJB behavior. Results show that wear changes the temperature distribution of the pads and oil film as well as the dynamic behavior of the system. Wear TPJBs exhibit higher vibration levels and contact pressures near the system's critical speed and service speed. Thermal and dynamic condition indicators are suggested to detect TPJB wear severity at its early stages.
Article
Engineering, Mechanical
Ren Luo, Binbin Liu, Sheng Qu
Summary: The study proposes a fast algorithm for calculating the wear evolution of wheel profiles, using a high-speed train as an example. Simulation results show good agreement between calculated wear distribution and measured results, with the proposed method being at least 15 times faster than traditional methods.
Article
Engineering, Civil
Hiroki Yamashita, Christofer Feldmeier, Yosuke Yamazaki, Takanori Kato, Takahiro Fujimoto, Osamu Kondo, Hiroyuki Sugiyama
Summary: This study developed a wheel profile optimization procedure to minimize flange wear while considering wear evolution. Experimental validation showed that the optimized profile can reduce both flange wear and tread surface damage simultaneously over an extended traveling distance.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART F-JOURNAL OF RAIL AND RAPID TRANSIT
(2022)
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
Mechanics
Jianlin Cai, Guo Xiang, Sheng Li, Juan Guo, Jiaxu Wang, Shouan Chen, Tianyou Yang
Summary: This paper develops a mathematical model to investigate the nonlinear dynamic mixed friction behaviors of a novel coupled bearing lubricated with low-viscosity fluid. The study reveals the effect of structural parameters on the friction behavior and verifies the model through numerical simulations.
Article
Engineering, Mechanical
D. Abboud, M. Elbadaoui, W. A. Smith, R. B. Randall
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2019)
Article
Engineering, Mechanical
Hongkun Wu, Ruowei Li, Ngai Ming Kwok, Yeping Peng, Tonghai Wu, Zhongxiao Peng
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2019)
Article
Engineering, Mechanical
Dikang Peng, Wade A. Smith, Robert B. Randall, Zhongxiao Peng
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2019)
Article
Engineering, Mechanical
R. B. Randall, J. Antoni, W. A. Smith
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2019)
Article
Engineering, Mechanical
Ke Feng, Pietro Borghesani, Wade A. Smith, Robert B. Randall, Zhan Yie Chin, Jinzhao Ren, Zhongxiao Peng
Article
Engineering, Mechanical
S. Wang, T. H. Wu, T. Shao, Z. X. Peng
Article
Engineering, Mechanical
Hongkun Wu, Ngai Ming Kwok, Shilong Liu, Ruowei Li, Tonghai Wu, Zhongxiao Peng
Article
Engineering, Mechanical
Wei Cao, Han Zhang, Ning Wang, Hai Wen Wang, Zhong Xiao Peng
Article
Materials Science, Multidisciplinary
I. I. Kabir, Y. Fu, N. De Souza, J. -C. Baena, A. C. Y. Yuen, W. Yang, J. Mata, Z. Peng, G. H. Yeoh
JOURNAL OF MATERIALS SCIENCE
(2020)
Article
Engineering, Mechanical
Alexandre Mauricio, Wade A. Smith, Robert B. Randall, Jerome Antoni, Konstantinos Gryllias
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2020)
Article
Automation & Control Systems
Shuo Wang, Tonghai Wu, Kunpeng Wang, Zhongxiao Peng, Ngaiming Kwok, Thompson Sarkodie-Gyan
Summary: Wear debris analysis is crucial for monitoring machine wear, with 3-D surface characterization being important for analyzing irregular wear particles. A new 3-D imaging method tracks multiple moving particles using Kalman filter, enabling reconstruction of particle surfaces through SfM and SfS methodologies.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2021)
Article
Engineering, Mechanical
Yuanning Mao, Pietro Borghesani, Zhan Yie Chin, Robert B. Randall, Zhongxiao Peng
Summary: The key diagnostic information in gears is carried by gearmesh stiffness and geometric profile errors. These properties combine with rotations and displacements of the gear shafts to produce a time-varying gearmesh force, which then affects the system's dynamic response and leads to actual diagnostic measurements. Due to the complexity of the time-varying gearmesh force, closed form analysis has been impractical and time-domain simulations have been used instead. This paper proposes a matrix-based procedure to linearize the relationship between gear meshing properties and measurements, and uses this to study the diagnostic measurement of transmission error.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2023)
Article
Engineering, Mechanical
Robert B. Randall, Jerome Antoni
Summary: Empirical mode decomposition (EMD) is a method to decompose complex signals into intrinsic mode functions (IMFs) which can be considered as carrier frequencies modulated in amplitude and phase. This paper shows that EMD is not suitable for rolling element bearing (REB) signals due to their intrinsic properties. Instead, other methods based on relevant criteria should be used to extract the desired diagnostic information. The paper also discusses the limitations of EMD, such as end effects and mode mixing, which make it difficult to guarantee repeatable results. The poor selectivity of the bandpass filters given by EMD is compared to alternative filters.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2023)
Article
Engineering, Mechanical
Yankui Song, Ke Xiao, Guo Xiang
Summary: The novelty of this study lies in constructing an Entropy-based wear and fluid-solid-thermal (FST) coupled model for journal bearings, and revealing the transient interaction behavior between wear evolution and FST evolution during repeated starting and stopping. The wear rate is measured experimentally, and the contact temperature, friction coefficient and normal contact force are obtained from the validated FST model. Wear tests and numerical calculations are conducted to validate the predicted wear rate and investigate the time-varying wear and FST evolution of journal bearings.
Article
Engineering, Mechanical
Xin-long Liu, Xin Guan, Yuan Zhong, Qian Xiao, Yong Cao, Wu-lue Zhang, Song Zhang, Yi-ting Zheng, Ming-sheng Gao, Dao-yun Chen, Wen-bin Yang
Summary: Gaps in the conductor rail joints of intercity trains have an impact on current transmission and the wear of carbon skateboards. These gaps decrease the coefficient of friction, increase electrical contact resistance, and affect the wear rate of carbon skateboards.
Article
Engineering, Mechanical
Yuhang Wu, Conglin Dong, Xiuqin Bai, Chengqing Yuan
Summary: The study developed a new composite material by incorporating hexagonal boron nitride (h-BN) particles into a thermoplastic polyurethane (TPU) matrix, which exhibited excellent self-lubricating properties and reduced frictional excitation forces. The addition of h-BN particles effectively reduced the coefficient of friction, decreased fluctuation amplitude, enhanced wear resistance, and attenuated vibration behaviors.
Article
Engineering, Mechanical
Tiancheng Ouyang, Xiuyang Sun, Wentao Tang, Yinxuan Li, Zhi Qun Tian, Yanzhou Li
Summary: By adding nitrogen-doped graphene and C60 nanoparticles to the lubricant, a highly efficient nano-lubricant with vibration and noise reduction properties is synthesized.
Article
Engineering, Mechanical
Xin Zhuo, Jun Cao, Haibo Huang, Li Liu, Xinkun Suo, Peiqing Ye, Zeshan Abbas
Summary: A polymer coating prepared by liquid spraying technology on the surface of 20CrMo steel demonstrates good tribological and anti-cavitation erosive properties. It can effectively replace CuPb24Sn copper alloy in valve plates for pumps under different lubrication conditions. The coating exhibits adhesive wear and reduces frictional loss, and mainly shows abrasive wear under complex working conditions. Its lipophilicity, high hardness to elastic modulus ratio, and corrosion resistance are the main influencing factors for its performance.
Article
Engineering, Mechanical
Md. Aminul Islam, Jiaren (Jimmy) Jiang, Yongsong Xie
Summary: Erosion-corrosion is a major factor in material loss and reduced useful life of hydro-transport equipment. This study evaluates the erosion-corrosion characteristics of different materials and finds that matrix wear affects the degradation of carbides. Sufficient wear and corrosion resistance in the surrounding matrix are important for good erosion-corrosion resistance.
Article
Engineering, Mechanical
Andre Dubois, Oussama Filali, Laurent Dubar
Summary: This study investigates the effect of surface roughness, contact pressure, and lubrication on the onset of galling in aluminum 6082-T6 using a pin-on-plate tribometer. The experimental results show that the roughness and lubricants play a significant role in preventing galling.
Article
Engineering, Mechanical
Jizhan Wu, Peitang Wei, Guoqiang Liu, Difa Chen, Xiuhua Zhang, Taimin Chen, Huaiju Liu
Summary: This study conducted a comprehensive evaluation of the DLC coating treatment on the loading capacity of gears and characterized the surface features and fatigue performance. The results demonstrate that DLC coating significantly improves the hardness and surface residual compressive stress of the gears, as well as enhances their contact fatigue performance.
Article
Engineering, Mechanical
Yangping Liu, Hwaran Lee, Annsley Mace, Jeremy L. Gilbert
Summary: An AFM-based single asperity tribology method was used to investigate the wear performance of carbides and base metal matrix in high carbon CoCrMo alloy. The wear behavior of the two types of carbides was stress-dependent and influenced by chemical composition. Cr-rich carbides exhibited higher wear resistance compared to Mo-rich carbides.
Article
Engineering, Mechanical
Zdenek Riha, Michal Zelenak, Akash Nag, Jakub Poloprudsky, Tomas Kruml, Sergej Hloch
Summary: This study investigates the erosion performances of a high-speed modulated jet (MWJ) and continuous water jet (CWJ). By comparing different nozzles and water jet powers, the effects of modulated and continuous jets on aluminum alloy were studied. The results show that under certain conditions, modulated jet can create deeper and sharper grooves while reducing the impact of lateral flow.
Article
Engineering, Mechanical
Chunyu Yu, Weipu Li, Yang Guo, Xianbin Sun, Fanli Hong, Ning Sun, Qinghai Zhang
Summary: This study explores the relationship between the wear rate of train brake pads and its features, and proposes a method for predicting the wear rate suitable for small sample data. Grey relational analysis and Pearson correlation analysis are used to determine the preferred features that affect the wear rate, and a BOA-BP model is established for prediction. The results show that BOA-BP exhibits better advantages in prediction with small samples.
Article
Engineering, Mechanical
Shan Yin, Xin Zhao, Shuangchao Huang, Zefeng Wen, Xuesong Jin
Summary: This study simulated the rolling contact of a driving wheelset over tangent and curved tracks at a speed up to 500 km/h using an explicit finite element approach to derive creep curves. The comparison between quasi-steady curves and transient curves in the presence of rail corrugation helped to identify cases where traditional theories are inapplicable and where transient effects must be considered. Additionally, the study further analyzed the influence of middle/high-frequency vibrations in the presence of rail corrugation.
Article
Engineering, Mechanical
Jiyao Zhang, Yuanlie Yu, Junlei Tang, Yingying Wang, Honggang Sun, Kaikai Song, Jianhong Gong, Pingping Liu, Xiaoming Liu, Lina Hu, Parthiban Ramasamy, Juergen Eckert
Summary: The influence of high-carbon addition on the microstructure, hardness, and wear behavior of CoCrNi alloy was investigated. It was found that the addition of carbon resulted in the formation of carbide particles, enhancing the hardness and improving the wear resistance. Fracture and detachment of hard carbides during friction introduced additional abrasive particles, transitioning the wear mechanism from adhesive-dominated to abrasive-dominated.
Article
Engineering, Mechanical
Yanfei Liu, Shengtao Yu, Ruize Zhang, Xiangyu Ge, Wenzhong Wang
Summary: This study reports the tribological behavior of nanodiamond plate (NDPL) as a nanoadditive for the first time and compares it with nanodiamond particles (NDPA). The results show that NDPL provides better lubrication performance at higher concentrations, and the sliding between NDPLs and the structural transformation from sp3 to sp2 carbon play a crucial role in lubrication and wear resistance.
