Article
Engineering, Mechanical
Ning Ding, Hulin Li, Ning Zhong, Qi Xin, Dan Jiang
Summary: This study experimentally explored the influence of working conditions on the friction properties, wear behaviors, and seizure limit of journal bearing friction pairs including aluminum bronze shafts and steel bearings. The results showed that the seizure limit value could be improved with the increase of relative clearance, and the wear mechanism shifted accordingly.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART C-JOURNAL OF MECHANICAL ENGINEERING SCIENCE
(2022)
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
Irene Buj-Corral, Piotr Sender, Carmelo J. Luis-Perez
Summary: In this paper, ANFIS models and multi-objective optimization were used to study tool wear, roughness, cylindricity, and material removal rate in finishing honing processes. The study found that low grain size, pressure, and linear velocity are recommended for minimizing roughness, cylindricity error, and tool wear. The evaluation of density and tangential velocity depends on the optimization algorithm employed.
TRIBOLOGY INTERNATIONAL
(2023)
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
Yuankai Zhou, Zhiyong Wang, Jiabiao Wang, Xue Zuo, Jing Xu
Summary: The use of ZB/SiO2 as lubricant additive improves the running-in quality and efficiency of journal bearings. The addition of ZB/SiO2 significantly improves the running-in efficiency and friction characteristics. This is of great significance in improving the reliability and extending the service life of journal bearings.
SURFACE TOPOGRAPHY-METROLOGY AND PROPERTIES
(2022)
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
Engineering, Mechanical
Irvin A. Vasquez-Chacon, Pedro Sanchez-Tizapantzi, Mario A. Gomez-Guarneros, Mauro A. Enciso-Aguilar, Ezequiel A. Gallardo-Hernandez
Summary: Rail grinding is an important maintenance strategy for controlling rail defects, reducing noise, and improving train stability. However, the impact of the rail surface roughness after grinding on friction coefficient and running-in behavior has not been well studied. This study characterized rail specimens with different textures using various roughness parameters and conducted tests under dry and grease-lubricated conditions. The results showed that rougher rail surfaces had higher friction coefficient and wear rate in dry conditions, while a rough surface did not necessarily result in a low static friction coefficient under lubricated conditions. Microstructural analysis revealed the presence of white etching layer and brown etching layer in some textures.
Article
Engineering, Multidisciplinary
Goto Daiki, Inoue Tsuyoshi, Hori Takekiyo, Yabui Shota, Katayama Keiichi, Tomimatsu Shigeyuki, Heya Akira
Summary: Pumps are important machines used in various applications. The wear and peeling of journal bearings supporting the pump shafts can cause abnormal vibration and damage to the pump. This study developed an experimental rig to monitor the long-term vibration and wear of journal bearings. A machine learning model (SVM) was used to predict the wear conditions, and important features contributing to wear and peeling were identified and analyzed.
STRUCTURAL HEALTH MONITORING-AN INTERNATIONAL JOURNAL
(2023)
Article
Engineering, Mechanical
Sahar Ghatrehsamani, Saleh Akbarzadeh, M. M. Khonsari
Summary: During the running-in stage of mechanical components, a model is developed to predict the changes in wear rate, friction coefficient, and surface asperities. Experimental results validate the predictions, showing acceptable agreement between predicted and actual data.
TRIBOLOGY INTERNATIONAL
(2022)
Article
Thermodynamics
Linbo Zhu, Yongsheng Zhu, Yuping Yan
Summary: This paper presents a method to generate wear load spectrum from measured loads by developing a load sensor that can identify load value and orientation, and introducing effect coefficients to consider the influence of perpendicular components on measured loads. The amplitude distribution and lasting time of wear load are extracted from complex load-time history using rain-flow counting method and Weibull distribution.
ADVANCES IN MECHANICAL ENGINEERING
(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
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
Instruments & Instrumentation
Jose-Luis Bote-Garcia, Clemens Guehmann
Summary: This article introduces a method for developing a system to predict the remaining useful lifetime of a journal bearing. It involves quantitatively monitoring the wear progression and using acoustic emission to classify friction states and estimate wear volume. Several experiments were conducted to create a dataset, and different machine learning methods were applied for estimation.
TM-TECHNISCHES MESSEN
(2022)
Article
Chemistry, Physical
Mang Gao, Yahui Li, Junho Choi
Summary: With the proliferation of IoT technology, the need for smart fault detection and condition monitoring in mechanical systems is urgent. Triboelectric nanogenerators (TENG) provide a novel approach to achieve self-powered sensing and are ideal for monitoring the condition of bearings. In this study, a triboelectric pad journal bearing (T-PJB) was designed and fabricated to directly monitor the bearing condition, with optimized geometry and electrical performance.
Article
Materials Science, Characterization & Testing
Jun Zhu, Zhong-Qing Xie, Hong-liang Gao, Xi-sheng Zhan
Summary: This article discusses the online monitoring method of the wear of journal bearings, analyzes the structural characteristics of a diesel engine, and presents the measurement results of parameters using a thermoelectric sensor designed by the research team. The study shows that thermoelectric signals can effectively reflect the wear and running state of journal bearings.
JOURNAL OF TESTING AND EVALUATION
(2021)
Article
Engineering, Chemical
Sukdeb Mandal, Manilal Murmu, Sirsendu Sengupta, Rishav Baranwal, Abhijit Hazra, Harish Hirani, Priyabrata Banerjee
Summary: In this study, two diazomethine functionalised long-chain organic molecules were synthesized and their surface protective and friction-reducing properties in lubricating oil were investigated. The addition of these additives resulted in a remarkable reduction of friction coefficient and wear amount, with ODE showing the best performance. Computational approaches such as density functional theory and molecular dynamics simulation were used to analyze the adsorption and tribofilm formation mechanism of the additives.
JOURNAL OF ADHESION SCIENCE AND TECHNOLOGY
(2023)
Article
Engineering, Mechanical
Saurabh K. Yadav, Gananath D. Thakre, Chandra B. Khatri
Summary: This study aims to improve the dynamic performance parameters and stability of bearings through optimized textured design. A multi-objective genetic algorithm is used to calculate the optimum texture parameters, resulting in a 25% improvement in stability parameter.
JOURNAL OF THE BRAZILIAN SOCIETY OF MECHANICAL SCIENCES AND ENGINEERING
(2022)
Article
Engineering, Chemical
Sukdeb Mandal, Sanjukta Zamindar, Surya Sarkar, Manilal Murmu, Lei Guo, Savas Kaya, Harish Hirani, Priyabrata Banerjee
Summary: Quantum chemical approaches are used to understand the structure-property relationship of organic molecules as corrosion inhibitors. This study investigates the adsorption behavior of three organic azo-dyes on TiO2 and ZnO surfaces using density functional theory and molecular dynamics simulation.
JOURNAL OF ADHESION SCIENCE AND TECHNOLOGY
(2023)
Article
Engineering, Manufacturing
Nitin Kumar Gupta, G. D. Thakre, Nalin Somani, Chander Prakash
Summary: The present study compares the impact strength of self-healing Al6061 composites reinforced with shape memory alloy and low melting point alloy. Experimental results show that the self-healing Al6061 composite filled with shape memory alloy has higher absorbed energy.
INTERNATIONAL JOURNAL OF INTERACTIVE DESIGN AND MANUFACTURING - IJIDEM
(2022)
Article
Engineering, Mechanical
Neha Sharma, Sunil Kumar, G. D. Thakre, Anjan Ray
Summary: The SFE and ST have an impact on wetting behavior at the interface of mating mechanical components. The influence of cyclic moieties and heteroatoms on wetting behavior and tribological properties like friction and wear is less well understood. This study introduces triangle esters with three-membered heteroatom rings and explores their friction and wear properties on four different metallic engineering substrates, finding correlations with surface properties and substrate hardness. The difference in polarity fraction between substrate and lubricant significantly affects wear properties.
TRIBOLOGY TRANSACTIONS
(2023)
Article
Physics, Multidisciplinary
Mohammad A. Amooie, K. P. Lijesh, Ali Mahmoudi, Elaheh Azizian-Farsani, Michael M. Khonsari
Summary: The effect of sudden variations in working modes and fatigue behavior of CS 1018 is studied using a general model based on the concept of fracture fatigue entropy (FFE). Fully reversed bending tests are conducted on dog bone specimens with variable frequency tests to simulate fluctuating working conditions. The results show that regardless of frequency changes, FFE remains constant and within a narrow band range, similar to a constant frequency.
Article
Acoustics
Sameera Mufazzal, S. M. Muzakkir, Sidra Khanam
Summary: In this paper, a dynamic model is proposed to accurately estimate the fault size of a ball bearing with an extended outer race defect. The model incorporates both varying stiffness and impact force excitation mechanisms, as well as continuously changing contact film damping and load distribution. The effects of different defect parameters and operating conditions are studied, and the theoretical findings are successfully validated using experimental results. The proposed method achieves a very good resemblance between actual and estimated values, with a maximum error of 4.88% for the smallest defect.
JOURNAL OF SOUND AND VIBRATION
(2023)
Article
Engineering, Mechanical
Sameera Mufazzal, S. M. Muzakkir, Sidra Khanam
Summary: Understanding the rate of spall propagation is crucial for estimating the remaining useful life of a spalled bearing. The mechanism of spall growth is not fully understood, but it is believed that the stress and strain behavior at the spall edge can provide insights into crack development and spall progression.
JOURNAL OF VIBRATION ENGINEERING & TECHNOLOGIES
(2023)
Article
Engineering, Mechanical
Kishan Nath Sidh, Dharmender Jangra, Harish Hirani
Summary: The present study investigates the tribological performance of 2D nanoparticles as gear lubricant additives. A new method of additive doping in gear lubricants is proposed and examined. The study explores the effect of surface roughness and mixing method on reducing wear, and the use of a surfactant to mitigate agglomeration. The results reveal the synergistic effect of the surfactant and deteriorating reagent on wear volume and friction reduction.
Article
Engineering, Mechanical
Neha Sharma, Sunil Kumar, Gananath D. Thakre, Anjan Ray
Summary: This study investigated the use of fatty acid 'Triangle ester' molecules (Epoxidized Ester (EE) and Thiirane Ester (TE)) as antifriction and antiwear additives in Group I and Group II mineral base oils. The results showed that EE blends improved antifriction and antiwear properties in both groups of base oils, while TE blends significantly reduced friction and wear. Molecular dynamics simulations were used to estimate the conformational changes, adsorption energy, intermolecular energy, and the effect of stress on the 'Triangle ester' molecules and their blends with mineral oil. Furthermore, optimized levels of these additives were found to effectively reduce friction and wear in commercial engine oil.
Article
Engineering, Mechanical
Harish Hirani, Dharmender Jangra, Kishan Nath Sidh
Summary: This paper thoroughly examines the impact of lubricating oil degradation on spur gear wear at all scales, from macro to nano. By combining results from macro and nanoscale experiments, it is shown that there is a strong connection between macro and nanoscale phenomena in assessing the tribological performance of gear lubricants. It is discovered that the spur gear experiences substantial wear in lubricant-degraded conditions, as verified by various monitoring methods.
Article
Materials Science, Multidisciplinary
Ali Mahmoudi, Mohammad A. Amooie, Lijesh Koottaparambil, Michael M. Khonsari
Summary: This study introduces a reliable technique for predicting the remaining useful life of components by measuring the temperature signature when the operating frequency is rapidly changed. The approach is validated through fatigue tests on stainless steel specimens. The method allows for predicting the remaining useful life at different operating frequencies.
Article
Environmental Sciences
Rachita Gupta, Harish Hirani, Ravi Shankar
Summary: This research provides a framework for managing solid waste, emphasizing the end-of-pipe strategy with waste segregation identified as the most influential strategy. It proposes a comprehensive framework for effective, efficient, and sustainable handling of different types of solid waste. A case study demonstrates the significance of waste segregation in achieving environmental, economic, and social benefits.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2023)
Article
Materials Science, Multidisciplinary
Somrita Nag, Amita Mondal, Harish Hirani, Priyabrata Banerjee
Summary: In this work, an innovative chromogenic and electrochemical chemosensor ABH was explored for the detection of As3+ and F-. The chemosensor exhibited distinct colorimetric transformation and rejuvenation effects, suggesting its strategic application for designing electronic circuits. Various experiments and theoretical computations substantiated the sensing phenomena. Additionally, an inexpensive portable arsenic sensor kit and smartphone-coupled diagnostic sensor station were developed for on-field detection of As3+.
MATERIALS ADVANCES
(2022)
Article
Management
S. P. Sreenivas Padala, J. Uma Maheswari, Harish Hirani
Summary: Managing changes in the construction industry is critical, but a comprehensive and systematic overview of change causes and effects is currently lacking. This study identifies and classifies change causes and effects in construction projects, providing a comprehensive list and proposing a taxonomy to support project teams in developing strategies.
INTERNATIONAL JOURNAL OF CONSTRUCTION MANAGEMENT
(2022)
Article
Engineering, Mechanical
Huiyi Yang, Yang Xu, Chao Xu
Summary: This study focuses on the impact of dry friction interfaces on the dynamics of jointed structures, particularly on the statistics of contact pressure distribution. Through experimental and simulation analysis, it is found that surface roughness and contact load have significant effects on contact area, contact stiffness, and mean contact pressure.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART J-JOURNAL OF ENGINEERING TRIBOLOGY
(2024)
Article
Engineering, Mechanical
Guanglan Hu, Houfu Dai
Summary: The effect of metal coating on the machinability of cubic silicon carbide was investigated using molecular dynamics simulation. The results showed that the type of coating has a significant impact on cutting force, surface morphology, stress, and tool wear. Among the three metals studied, Cu coating had the greatest impact on improving cutting performance.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART J-JOURNAL OF ENGINEERING TRIBOLOGY
(2024)
Article
Engineering, Mechanical
Yunfan Liu, Guozheng Ma, Lina Zhu, Cuihong Han, Zhen Li, Bin Zhang, Haichao Zhao, Haidou Wang, Shuying Chen
Summary: The service performance of coated self-lubricating spherical plain bearings can be improved by applying self-lubricating coatings, especially double-sided coatings. The presence of a large-area and complete mixed friction transfer film on the contact surfaces can cause a signal downstage before the signal mutation stage.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART J-JOURNAL OF ENGINEERING TRIBOLOGY
(2024)
Article
Engineering, Mechanical
Yakup Artun, C. Oktay Azeloglu, Gokhan Taylan
Summary: This article investigates the tribological properties of polymer journal bearings, particularly focusing on radial journal bearings made from UHMWPE and POM materials with different surface qualities. The study examines the performance of these bearings under varying load and speed conditions, and analyzes the relationship between material and surface roughness in tribological performance.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART J-JOURNAL OF ENGINEERING TRIBOLOGY
(2024)