Article
Engineering, Mechanical
Zumin Wu, Chengqing Yuan, Zhiwei Guo, Qiren Huang
Summary: As an important component, the lubricating performance of the water-lubricated bearing greatly affects the safe operation of the propulsion system. However, the lubricating performance of the water-lubricated bearing is difficult to guarantee under low speed due to the difficulty in forming a water film. Grooves have been widely used to improve lubricating performance, but the influence of groove parameters on the lubricating performance of the water-lubricated groove bearing (WLGB) under low speed lacks systematic reporting. This study developed a numerical model and investigated the effect of groove kinds, locations, sizes, and amounts on the lubricating performance of WLGB under low speed.
Article
Chemistry, Multidisciplinary
Mingyu Xu, Wei Chen
Summary: The study focuses on the application of liquid metal in high-performance computed tomography equipment, analyzing the viscosity of liquid metal and its performance under high temperature and vacuum conditions to provide theoretical guidance and analytical methods for improving equipment efficiency.
APPLIED SCIENCES-BASEL
(2021)
Article
Physics, Multidisciplinary
Peng Li, Jiayu Li, Zhanqun Shi, Hao Zhang, Sen Xiao, Xin Li, Fengshou Gu
Summary: This study investigates the effects of manufacturing error and micro-groove on the static, dynamic, and stability characteristics of water-lubricated journal bearings. Mathematical models and simulations are used to evaluate the impact of these factors on the film thickness distribution, fluid pressure distribution, bearing capacity, and other parameters. The results show that manufacturing errors and micro-groove significantly affect the fluid film thickness and pressure distribution. The magnitude and type of errors can either improve or degrade the bearing performance, and micro-groove enhances the hydrodynamic effect in the bearing clearance.
Article
Engineering, Mechanical
Xiaohui Lin, Shun Wang, Shuyun Jiang, Shaowen Zhang
Summary: This study investigates the influence of interface effect and cavitation bubble distribution on the dynamic characteristics of high-speed water-lubricated spiral groove thrust bearings. A turbulent cavitating flow lubrication model is established based on two-phase fluid and population balance equation of bubbles. The stiffness and damping coefficients of the bearings are calculated using perturbation pressure equations. Experimental results validate the theoretical model. The findings suggest that the turbulent effect has a greater impact on the dynamic characteristics of the bearings compared to the cavitation effect.
CHINESE JOURNAL OF MECHANICAL ENGINEERING
(2022)
Article
Engineering, Mechanical
Tianming Ren, Ming Feng
Summary: In order to improve the stability problem of water lubricated journal bearings in high-speed conditions, the lobe pocket with an Archimedes helix profile was designed. The effects of radius clearance, pocket parameters, water supply pressure, restriction parameter, and external load were analyzed, considering turbulence. The results showed that decreasing radius clearance and increasing pocket depth improved bearing stability, while pocket widths had optimal values. Water supply pressure and orifice diameter increased the threshold speed at low speeds. The findings of this study provide valuable information for designing high-stability journal bearings.
TRIBOLOGY INTERNATIONAL
(2023)
Article
Engineering, Mechanical
Shuyun Jiang, Pengfei Liu, Xiaohui Lin
Summary: This article aims to establish a theoretical model for water-lubricated textured spiral groove thrust bearing and analyze its static characteristics. The verified tests indicate that texture effects can reduce the friction torque of the bearing, and there exists an optimal texture parameter for maximum load-carrying capacity. Furthermore, the cavitation effect increases the load-carrying capacity of the bearing.
JOURNAL OF TRIBOLOGY-TRANSACTIONS OF THE ASME
(2022)
Article
Engineering, Mechanical
Hao Zhang, Xiaohui Lin, Shuyun Jiang
Summary: This study proposes a turbulent flow model considering the effects of turbulence and cavitation in water-lubricated bearings, and validates the model through simulations and experiments. The results demonstrate that both turbulence and cavitation effects have significant impacts on the static characteristics of the bearing.
JOURNAL OF TRIBOLOGY-TRANSACTIONS OF THE ASME
(2023)
Article
Engineering, Mechanical
Juan Guo, Yanfeng Han, Shouan Chen, Jianlin Cai, Haiming Dai
Summary: This study reveals the influence mechanism of wall slip on the dynamic characteristics of water-lubricated bearings considering rough contact. Numerical results show that wall slip has a significant impact on water film stiffness coefficients, while its influence on damping and contact stiffness coefficients is relatively small.
INDUSTRIAL LUBRICATION AND TRIBOLOGY
(2022)
Article
Engineering, Mechanical
Fangrui Lv, Chunxiao Jiao, Qian Jia, Kang Xia
Summary: This paper establishes a mixed lubrication model for water-lubricated polymer bearings considering the effect of journal misalignment, liner elastic deformation, and local turbulence. The influence of key structural and operating parameters on the bearing performance with journal misalignment is investigated.
Article
Metallurgy & Metallurgical Engineering
Peng-fei Wang, Yang Yang, Hong-yang Xu, Hui Ma, Qing-kai Han, Zhong Luo, Bang-chun Wen
Summary: In this study, a five-degree of freedom nonlinear force model considering bearing misalignment is proposed, and the effects of misalignment on the dynamic contact characteristics of bearing and the vibration characteristics of the rotor system are analyzed. Evaluation indexes for bearing misalignment are given based on the dynamic response. The research provides valuable insights for fault identification of the rotor-bearing system.
JOURNAL OF CENTRAL SOUTH UNIVERSITY
(2023)
Article
Engineering, Mechanical
Haifeng Ran, Peng Dai, Shuping Yan, Fengtao Wang, Xingjia Yao, Jianping Wang, Guizhong Zuo
Summary: This paper studies the lubrication mechanism of thrust bearings with herringbone spiral grooves by building a three-dimensional finite element flow model. The influence of parameters is analyzed, and the optimal structural parameter is proposed to improve bearing stability and provide a reference for engineering practice.
Article
Engineering, Mechanical
Shaowen Zhang, Shuyun Jiang
Summary: This technical brief investigates the static characteristics of double-pad inwardly pumping and outwardly pumping water-lubricated spiral-groove thrust bearings (SGTB) through the establishment of a lubrication model and experimental verification. The results suggest that the outwardly pumping version can outperform the inwardly pumping version under certain conditions, offering better axial load capacity and resistance to tilting.
JOURNAL OF TRIBOLOGY-TRANSACTIONS OF THE ASME
(2021)
Article
Engineering, Mechanical
Jijo Jose, Niranjana Behera
Summary: The study shows that using dry powder lubricants can effectively eliminate oil degradation in hydrodynamic bearings under high temperatures and extreme conditions. The increase in ellipticity ratio affects the performance of three-lobed bearings, with larger powdered particles showing better load carrying capacity and stability compared to smaller particles.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART J-JOURNAL OF ENGINEERING TRIBOLOGY
(2021)
Article
Engineering, Mechanical
Zhongliang Xie, Xuerui Wang, Weidong Zhu
Summary: This study investigates the fluid structure interaction (FSI) dynamic behaviors of water-lubricated bearings with axial asymmetric grooves. Revised FSI models considering cavitation and turbulent effects are proposed. The simulations are consistent with existing literature and experimental data, confirming the accuracy of the model. The effects of groove types and locations on dynamic behaviors are systematically explored, showing that the separation effects of the local asymmetric grooves coupled with the rotation effects enhance the hydrodynamic effects, leading to increased maximum pressure values and load carrying capacity (LCC).
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2022)
Article
Engineering, Mechanical
Guangwu Zhou, Renpan Li, Daxin Liao, Wanyou Yang, Ping Zhong
Summary: In order to meet the urgent requirements of shaftless rim-driven thrusters for low and medium speed, high load capacity, and wear-resistant water-lubricated bearings, this paper conducted research on the lubrication structure design of water-lubricated spiral groove rubber thrust bearings (SGRTBs). A mixed lubrication analysis technique was proposed, considering the effect of surface roughness, and the optimization design of the spiral groove structure parameters was achieved, addressing the mixed lubrication issue of typical spiral surface contact.
TRIBOLOGY INTERNATIONAL
(2023)
Article
Engineering, Aerospace
Anand Pai, Arastu Sharma, Irene Mary Eby, Chandrakant R. Kini, Satish B. Shenoy
Summary: Orbital debris poses a constant threat to spacecraft and satellites, and it has become a growing concern with the increasing number of space objects. To protect against small debris or micrometeoroid orbital debris (MMODs), Whipple shields made of impact-resistant materials are used. This study used numerical simulations to investigate the damage and deformation behavior caused by hypervelocity impacts on monolithic and coated Whipple shields. The simulations were conducted using the AUTODYN(R) module of the ANSYS(R) finite element software at velocities of 3.5 km/s and 5.5 km/s.
Review
Computer Science, Interdisciplinary Applications
Kamat Harishkumar, Kini R. Chandrakant, Shenoy B. Satish
Summary: Fluid film bearings are widely used in high-speed industrial machineries and have been extensively studied using numerical methods. This paper reviews the various Computational Fluid Dynamics and Fluid-Structure Interaction techniques used to solve the flow equations for fluid film bearings, and compares the computed performance parameters.
ARCHIVES OF COMPUTATIONAL METHODS IN ENGINEERING
(2023)
Article
Geography, Physical
K. R. Akshatha, A. K. Karunakar, B. Satish Shenoy, K. Phani Pavan, Chinmay V. Dhareshwar, Dennis George Johnson
Summary: Intelligent UAV video analysis has gained attention for its potential in computer vision applications. In order to address the challenge of small object detection, a Manipal-UAV person detection dataset was created, consisting of images captured from UAVs in varying conditions. The dataset provides a benchmark for evaluating state-of-the-art object detection algorithms on small person objects in aerial view scenarios. The dataset is publicly available for researchers to advance UAV and small object detection research.
ISPRS JOURNAL OF PHOTOGRAMMETRY AND REMOTE SENSING
(2023)
Article
Radiology, Nuclear Medicine & Medical Imaging
Celine Gutmann, Numa Shaikh, B. Satish Shenoy, N. Shaymasunder Bhat, Laxmikant G. Keni, K. N. Chethan
Summary: The hip joint helps transfer weight from the upper body to the lower body, and artificial hip implants can replace degenerated hips. Wear between the joints is the primary cause of implant loosening, which can occur for various reasons. Small design changes can greatly improve the lifespan of the implant, and a decrease in TTR radius leads to a decrease in wear rate.
BIOMEDICAL PHYSICS & ENGINEERING EXPRESS
(2023)
Article
Engineering, Multidisciplinary
John Valerian Corda, B. Satish Shenoy, Kamarul Arifin Ahmad, Leslie Lewis, K. Prakashini, Anoop Rao, Mohammad Zuber
Summary: This study aims to evaluate the flow parameters and particle deposition parameters of the nasal cavity in neonatal and infant populations. The results show that neonatal nasal cavities have higher velocity, pressure, and deposition efficiency than infant nasal cavities. These findings can guide the administration of aerosol-based medications in patients of different ages.
INTERNATIONAL JOURNAL OF MODELLING AND SIMULATION
(2023)
Article
Engineering, Civil
Anand Pai, Chandrakant R. Kini, Sriharsha Hegde, B. Satish Shenoy
Summary: Fiber metal laminates (FMLs) for blast and ballistic resistance applications require ballistic grade plies like aramid (Kevlar) and ultra-high molecular weight polyethylene (Spectra) as supporting layers, stacked in different orders based on functional grading. In this study, five FML sequences consisting of AA6061-T6, aramid, ultra-high molecular weight polyethylene, and paperboard were developed, with the novelty of layering based on shock impedance. Mechanical and damping performance were evaluated using various metrics, and the FML sequences BRSP-II and BRSP-IV demonstrated the best performance when a low-impedance ply (paperboard layer) was placed before the AA6061-T6 rear skin.
THIN-WALLED STRUCTURES
(2023)
Article
Engineering, Multidisciplinary
Numa Shaikh, B. Satish Shenoy, N. Shaymasunder Bhat, Sawan Shetty, K. N. Chethan
Summary: The hip joint is crucial for transmitting weights in daily activities, and wear is the main cause of loosening of hip implants. Wear assessment during the design stage can provide information on implant life expectancy and make adjustments to enhance it, reducing the need for revision surgery. This study estimated linear wear at the contact surfaces of the femoral head to the acetabular cup and backing cup. Different material combinations were tested, and the CoCr combination showed the lowest wear rate. These designs can be 3D-printed and tested in a hip simulator.
COGENT ENGINEERING
(2023)
Review
Engineering, Civil
Anand Pai, Marcos Rodriguez-Millan, Masuhiro Beppu, Borja Valverde-Marcos, B. Satish Shenoy
Summary: This paper reviews the latest experimental techniques for characterizing the impact resistance, shock energy absorption, high strain-rate responses and endurance of materials used for shielding in blast and ballistic impact scenarios. It provides insights into various testing methods and strategies for high-performing shielding configurations.
THIN-WALLED STRUCTURES
(2023)
Article
Energy & Fuels
Manjunath Shetty, Karnan Manickavasakam, Chethan Sabbanahalli, Chandrakantha Bekal, Izan Izwan Misnon, Ashwath Subrahmanya, Kunal Roy, Prasanna D. Shivaramu, Satish Shenoy, Dinesh Rangappa
Summary: The application of novel three-dimensional (3D) architectures in energy storage has attracted researchers' interest for its potential in advancing technological advancements. This study utilizes the supercritical water method to synthesize a hierarchical three-dimensional Bi2WO6 microsphere/Reduced Graphene Oxide (BWS/RGO) nanocomposite, showing promising results in terms of sample characteristics, morphological properties, and electrochemical behavior for lithium-ion storage and supercapacitor studies.
JOURNAL OF ENERGY STORAGE
(2023)
Article
Dentistry, Oral Surgery & Medicine
Karishma S. Talreja, Shobha J. Rodrigues, Umesh Y. Pai, Thilak Shetty, Sharon Saldanha, M. Mahesh, Puneeth Hegde, Satish B. Shenoy, Nithesh Naik, Sandipan Mukherjee, Ann Sales, Vignesh Kamath, Prashant Bajantri
Summary: This study evaluated the stress distribution in short dental implants with different implant-abutment connections using finite element analysis. The results showed that splinting of short implants resulted in reduced and more uniform stress and microstrain, especially under oblique loading. The microstrain values for all connections evaluated were within the safe range for clinical use.
INTERNATIONAL JOURNAL OF DENTISTRY
(2023)
Article
Radiology, Nuclear Medicine & Medical Imaging
John Valerian Corda, K. N. Chethan, N. Shyamasunder Bhat, Sawan Shetty, B. Satish Shenoy, Mohammad Zuber
Summary: This study investigates the impact of patient-specific dynamic loadings on the evaluation of hip implants and explores the effects of different materials and profiles on stress and displacement. The results suggest that using UHMWPE as the acetabular cup material can effectively prevent squeaking after replacement.
BIOMEDICAL PHYSICS & ENGINEERING EXPRESS
(2023)
Article
Nanoscience & Nanotechnology
Nur Marini Zainal Abidin, Mohamed Thariq Hameed Sultan, Ain Umaira Md Shah, Farah Syazwani Shahar, Muhammad Imran Najeeb, Mohd Radzi Ali, Adi Azriff Basri, Satish Shenoy Baloor, Milan Gaff, David Hui
Summary: This study aims to investigate the use of hybrid composite materials with honeycomb structure in aircraft structures. By replacing synthetic fiber with natural fiber and using a honeycomb core, the mechanical strength of the composites was analyzed. The results showed promising properties for the newly developed GKHKG composite, making it suitable for semi-structural and structural light-weight applications.
REVIEWS ON ADVANCED MATERIALS SCIENCE
(2023)
Article
Multidisciplinary Sciences
Anand Pai, Marcos Rodriguez-Millan, Chandrakant R. Kini, B. Satish Shenoy
Summary: This study aims to develop hybrid Fiber Metal Laminates (FMLs) for shock shielding. Shock experiments and numerical simulations are conducted using a multi-layered FML configuration with different materials. The results reveal a significant influence of core layer arrangement on the deformation of FMLs.
SCIENTIFIC REPORTS
(2023)
Article
Thermodynamics
Jayakrishnan Radhakrishnan, Surya Sridhar, Mohammed Zuber, Eddie Y. K. Ng, B. Satish Shenoy
Summary: This study focuses on the conceptual design optimization of a Contra-Rotating VAWT (CR-VAWT) using Taguchi method and CFD. The results indicate that blade height has the greatest impact on the performance of CR-VAWT, while the number of blades has the least impact. Proper selection of design parameters can lead to better performance of CR-VAWT compared to conventional VAWT.
ENERGY CONVERSION AND MANAGEMENT
(2023)
Article
Multidisciplinary Sciences
Anand Pai, Marcos Rodriguez-Millan, Chandrakant R. Kini, Ravindra Mallya, Chandrakantha Bekal, Suhas Yeshwant Nayak, Satish B. Shenoy
Summary: Fiber-metal laminates (FMLs) have significant potential in various applications and are particularly crucial for aircraft structures exposed to shock wave and high velocity impacts. This study focuses on developing custom shielding laminates and analyzing the impact of shock impedance tuning on the behavior of FMLs at high strain rates. The results show improved energy absorption and transmission loss for certain laminates, indicating the effectiveness of the shock impedance matching approach.
SCIENTIFIC REPORTS
(2023)
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)