Article
Engineering, Mechanical
Guangwu Zhou, Jinsheng Qiao, Wei Pu, Ping Zhong
Summary: The present study improves the conventional water-lubricated rubber bearing (WLRB) by using a tilting-pad structure and develops a mixed elastohydrodynamic (Mixed-EHD) model for water-lubricated rubber tilting-pad journal bearing (WLRTPJB). The study investigates the influence of structural and operating parameters on the tribological properties and pad swing characteristics. The results show that the WLRTPJB has a lower contact load, especially under heavy load conditions, and provide optimal pivot offset and preload factor to minimize contact pressure. Moreover, the equilibrium tilting-pad angle is sensitive to changes in design and operating parameters. This study has certain guiding significance for the design optimization of WLRB.
TRIBOLOGY INTERNATIONAL
(2022)
Article
Engineering, Multidisciplinary
Fei Hu, Changxiong Ning, Wu Ouyang
Summary: Water-lubricated polymer bearing is crucial for the operation of various equipment. This paper proposes an in-situ measurement method for bearing wear using ultrasound and parameter inversion. The experiment proves the high accuracy of parameter inversion for thickness, density, and attenuation factor, with errors within acceptable ranges.
Article
Engineering, Electrical & Electronic
Nan Wang, Yifan Zhao, Chengfeng Li, Peng Wang, Changming Zhang
Summary: Accurate measurement of film pressure distribution in water-lubricated bearings is essential for understanding bearing characteristics. Traditional power supply methods for wireless sensor nodes are not suitable for rotational conditions, so a contactless power supply method using a magnetic coupler was proposed. Tests showed that the proposed method achieved high efficiency and stability, making it applicable to other rotating equipment.
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
(2023)
Article
Engineering, Mechanical
Guangwu Zhou, Kepeng Wu, Wei Pu, Peng Li, Yanfeng Han
Summary: This paper investigates the modification effects of different nano-fillers on the basic formulation of hydrogenated nitrile rubber (HNBR). The results show that UHMWPE and GF have different improvements on the tribological performance of rubber materials under different speed conditions. To achieve the best comprehensive performance, appropriate nano-fillers should be selected for modification according to the operating conditions.
Article
Mechanics
Yuanying Du, Jianying Lan, Hui Quan, Chenxi Sun, Xiaoyi Liu, Xueling Yang
Summary: By using four different turbulent lubrication mathematical models, the lubrication characteristics of water-lubricated rubber bearings under high-Reynolds-number operating conditions were studied. The turbulent lubrication models showed higher bearing capacity and film pressure compared to laminar lubrication models, and the Aokihiro-Harada Masahiro turbulent lubrication theory was found to be more accurate. Additionally, non-linear and approximately linear increases in bearing capacity and maximum film pressure were observed with increasing eccentricity and rotational speed, while non-linear decreases and approximately linear increases were observed with increasing clearance ratio.
Article
Engineering, Mechanical
Gang Liu, Ming Li
Summary: Experimental results show that the water film can bear a certain negative pressure without cavitation, and the bearing load increases faster as the rotating speed increases, indicating turbulent flow at high rotating speeds.
TRIBOLOGY INTERNATIONAL
(2021)
Article
Engineering, Mechanical
Shengdong Zhang, Zhilin Long, Xiuying Yang
Summary: This research proposes a magnetorheological fluid-lubricated rubber stern bearing test ring to study the effects of temperature, magnetic field strength, and eccentricity ratio on lubrication performance. By solving the Reynolds equation with the finite difference method and successive over-relaxation method, it is found that bearing capacity can be improved and friction coefficient reduced by adjusting these parameters. The results of this study may offer valuable theoretical and experimental support for the design of rubber stern bearings lubricated with this type of magnetorheological fluid.
JOURNAL OF THE BRAZILIAN SOCIETY OF MECHANICAL SCIENCES AND ENGINEERING
(2021)
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
Thermodynamics
Hongbin Ji, Jianmei Wang, Wanru Zhang, Zhiyu Zhao, Yang Li
Summary: In this study, machine learning algorithms were used to predict the maximum temperature of fluid-lubricated bearings. It was found that bearing temperature is nonlinearly positively correlated with journal linear speed, bearing specific pressure, lubricant viscosity, and inlet temperature. The artificial neural network (ANN), k nearest neighbors (KNN), and random forest (RF) algorithms showed satisfactory accuracy in the low-to-medium temperature range, while the accuracy of ANN and RF decreased significantly in the high temperature region. KNN was identified as the optimal algorithm due to its high precision and insensitivity to abnormal data.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2023)
Article
Chemistry, Multidisciplinary
Chen Li, Qiyun Feng, Yingping Hong, Lixia Gao, Ximing Guo, Wenzhi Xue, Jijun Xiong
Summary: In this study, a wireless LC conformal temperature sensor was proposed for measuring the temperature of bearings at high speed. The sensor integrated silver on the bearing surface through a screen-printing process, allowing for wireless measurements. Experimental results showed that the sensor could work stably at high temperatures and achieved good accuracy and stability in the temperature range of 20-270 degrees C.
Article
Engineering, Marine
Yong Jin, Ruiqing Li, Wu Ouyang, Zhenglin Liu, Qilin Liu, Qipeng Xiong, Jianhui Zhou
Summary: Under low speed and heavy load operating conditions, the marine water-lubricated bearing (WLB) experiences abnormal friction-induced vibrations and noise in underwater vehicles due to mixed lubrication state. An empirical mode decomposition (EMD) based method was proposed to identify the friction-induced vibration characteristics of WLB and experiments were conducted. The study revealed that specific pressure and lubricant temperature had significant effects on friction-induced vibrations, while cooling water flow had little effect. Analyzing the characteristics of IMF energy, time-domain standard deviation, bias angle, and center of gravity frequency could visualize the trend and critical points of friction-induced vibrations.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2023)
Article
Engineering, Chemical
Yuanying Du, Hui Quan
Summary: This study establishes mixed-flow lubrication equations based on classical laminar and turbulent lubrication theories to investigate the lubrication characteristics of water-lubricated rubber bearings (WLRBs) in mixed-flow state. The results show that the mixed-flow lubrication equations are more suitable for WLRBs under actual operating conditions compared to laminar and turbulent theories. The study provides important reference for accurate analysis of WLRBs lubrication characteristics in practical engineering applications.
LUBRICATION SCIENCE
(2022)
Article
Chemistry, Multidisciplinary
Yanfeng Han, Ting Tang, Guo Xiang, Hang Jia
Summary: This study investigates the impact of propeller shaft deflection on the fluid-solid-heat coupling performance of water lubricated rubber stern bearing, and develops a model to validate the findings. Results suggest that under heavy load conditions, the deflection of the stern shaft should be taken into account in the analysis of FSH performance of the JWR system.
APPLIED SCIENCES-BASEL
(2021)
Article
Computer Science, Artificial Intelligence
Ke Zhao, Hongkai Jiang, Kaibo Wang, Zeyu Pei
Summary: This paper developed a joint distribution adaptation network with adversarial learning to address fault diagnosis challenges. By constructing a deep convolutional neural network to extract features, and using an improved joint maximum mean discrepancy and adversarial domain adaptation to match feature distributions and extract features, precise distribution matching and domain-invariant features extraction were achieved.
KNOWLEDGE-BASED SYSTEMS
(2021)
Article
Engineering, Mechanical
Wu Ouyang, Qilong Yan, Junxin Kuang, Yong Jin, Weicai Peng
Summary: By introducing the squeeze film damper technology, the design of ship water-lubricated stern bearing successfully balances high load-carrying capacity and low natural frequency. Experimental results indicate that WDSB shows significant vibration reduction effect compared to CWSB.
JOURNAL OF THE BRAZILIAN SOCIETY OF MECHANICAL SCIENCES AND ENGINEERING
(2021)
Article
Chemistry, Physical
Jin Qiu, Ying Lei, Feng Gao, Yu Li, Chao Yong, Nan Wang, Guangyuan Song, Xingxiang Fan
Summary: Nearly single-phase Bi1-xCaxCuSeO bulks were fabricated via 4 min microwave synthesis combined with 5 min spark plasma sintering (SPS). The effect of Ca doping on the thermoelectric performance was studied, and it was found that the conductivity and power factor increased with increasing Ca concentration due to the increase in carrier concentration and mobility. The two-dimensional layered superlattice structure resulted in relatively low lattice thermal conductivity, leading to enhanced thermoelectric performance.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Construction & Building Technology
Xiongfei Liu, Zhuang Wang, Nan Wang, Yaoyao Wu
Summary: In order to shield the construction of buildings against electromagnetic radiation hazards, magnesium phosphate cement (MPC) functionalized with impedance matching agent of expanded polystyrene (EPS) and absorber of Mn-Zn ferrite that exhibits excellent electromagnetic wave absorption performance (EWAP) is fabricated. The influences of EPS and Mn-Zn ferrite contents and layers of specimens on the reflection loss (RL) of MPC in the frequency range of 1-18 GHz are systematically investigated. The results show that EPS and Mn-Zn ferrite significantly enhance the EWAP of MPC due to their effects on porous structure and multiple magnetic loss.
JOURNAL OF MATERIALS IN CIVIL ENGINEERING
(2023)
Review
Optics
Xuechun Chen, Nan Wang, Chaojian He, Xuechun Lin
Summary: This article reviews the development and research status of all-fiber actively Q-switched oscillators, introduces various active Q-switching technologies and Q-factor optical modulators in chronological order, and looks forward to future development.
OPTICS AND LASER TECHNOLOGY
(2023)
Article
Engineering, Manufacturing
Zhan Wang, Sheng-Wen Zhang, Nan Wang, Jing-Ying Xu, De-Jun Cheng
Summary: This paper proposes a feature-based assembly information model to address the issues in complex product assembly design, and verifies its performance and applicability.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART B-JOURNAL OF ENGINEERING MANUFACTURE
(2023)
Article
Engineering, Chemical
Zixin Yin, Nan Wang, Tongqing Li, Yuxing Peng
Summary: This study investigates the particle breakage behavior in ball mills and quantitatively analyzes the effects of particle size, impact energy, and the number of impacts. The results show that the breakage probability model and product size distribution model can accurately predict the particle breakage behavior in single-particle impact experiments. Additionally, the tn-t10 relationship can conveniently characterize and predict the particle size distribution. The study also provides theoretical and methodological support for evaluating and optimizing particle breakage in ball mills.
ADVANCED POWDER TECHNOLOGY
(2023)
Article
Chemistry, Physical
Chao Yong, Ying Lei, Yinghui Liu, Yu Li, Nan Wang, Bihai Tong, Lei Tao
Summary: In this study, blue-light and red-light carbon dots with triple emission were prepared using cyanobacteria as a carbon source via a facile microwave hydrothermal route. The introduction of alkali increased the self-doping content of nitrogen and formed a hydroxyl shell on the surface of carbon dots. The synergistic effect of hydroxyl groups and graphitic nitrogen resulted in the formation of red-light carbon dots with triple-peaked emission. These red-light carbon dots were successfully applied as a visual ratiometric fluorescence sensor for lead ions.
APPLIED SURFACE SCIENCE
(2023)
Article
Construction & Building Technology
Lei Xu, Yang Liu, Min Chen, Nan Wang, Hong Chen, Lei Liu
Summary: In this study, reduced copper slag after iron and copper extraction was used as a new raw material to prepare novel anorthite-based ceramics. The results show that adding slag can enhance the sintering, reduce porosity, improve mechanical properties, and maintain whiteness. However, excessive slag addition leads to limited densification and inferior mechanical and color performance.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Metallurgy & Metallurgical Engineering
Xiaoao Li, Nan Wang, Min Chen, Zhiqiang Du
Summary: The effects of oxygen, magnesium, and sulfur content in Al-killed tinplate steel on the liquid zone of inclusion modification by calcium treatment were clarified. The inclusions in molten steel were mostly Al2O3 before calcium treatment. After calcium treatment with a holding time of 10 min, the inclusions transformed to CaO·Al2O3, and with a holding time of 30 min, the inclusions were mainly 3CaO·Al2O3. When T.O content increased to 40 ppm, 12CaO·7Al(2)O(3) inclusions were observed. The increase of T.O content enlarged the liquid zone range of inclusion modification by calcium treatment and increased the critical calcium content. With the increase of magnesium content, the liquid phase ratio of inclusions modification by calcium treatment decreased. The increase of sulfur content in molten steel narrowed the liquid zone range of inclusion modification by calcium treatment.
ISIJ INTERNATIONAL
(2023)
Article
Materials Science, Multidisciplinary
Ruiqi Zeng, Nan Wang, Wei Li
Summary: In this study, the effect of MgO addition on the reduction of Hongge vanadium titanomagnetite pellet (HVTMP) was investigated. The results showed that the addition of MgO increased the porosity of HVTMP, leading to a higher initial reduction rate but a lower final reduction degree. X-ray diffraction analysis revealed the formation of MgFe2O4, which hindered the further reduction of Fe2TiO4 and the migration of metallic iron. The reduction swelling decreased and the compressive strength of the reduced HVTMP increased with increasing MgO addition, mainly due to the increased hardness. This study establishes a relationship between MgO and reduction, providing valuable insights for the effective utilization of HVTMP in shaft furnaces and the development of sustainable metallurgy.
Article
Engineering, Electrical & Electronic
Chao Yong, Ying Lei, Xiaowu Jiang, Yu Li, Jin Qiu, Feng Gao, Nan Wang, Guangyuan Song, Huaichuan Hu
Summary: Indium-filled InxCo4Sb12 thermoelectric bulk ingots were successfully synthesized using microwave synthesis and spark plasma sintering. X-ray diffraction analysis confirmed the presence of body-centered cubic CoSb3 as the major phase, with secondary phases found in different samples. Scanning transmission electron microscopy revealed nano-sized CoSb2 particles, incoherent grain boundaries, and dislocations. The carrier concentration of InxCo4Sb12 ranged from 4.95 x 10(19) to 2.91 x 10(20) cm(-3), and the minimum lattice thermal conductivity achieved was 1.63 Wm(-1) K-1. In0.8Co4Sb12 exhibited a maximum ZT of 0.90 at 673 K.
JOURNAL OF ELECTRONIC MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Meiyan Liu, Hongmin Hao, Guanming Liao, Chenglong Li, Kanglei Liu, Nan Wang, Quan Niu, Xiaodong Yin
Summary: Donor-acceptor molecules Mes*BA-Cz and (F)XylBA-Cz were designed and synthesized, exhibiting fluorescence-phosphorescence dual-emission in solid state. The phosphorescent emission was primarily caused by molecular stacking in the crystalline state, enabling aggregation-induced intersystem crossing. The compounds also showed mechanochromism, with emission color changing between amorphous and crystalline state. A white organic light-emitting diode (WOLED) with CIE coordinates of (0.31, 0.33) and an external quantum efficiency of 0.49% was successfully fabricated using (F)XylBA-Cz.
ADVANCED OPTICAL MATERIALS
(2023)
Review
Chemistry, Multidisciplinary
Zhengdao Pan, Sheng Yu, Linfang Wang, Chenyu Li, Fei Meng, Nan Wang, Shouxin Zhou, Ye Xiong, Zhoulu Wang, Yutong Wu, Xiang Liu, Baizeng Fang, Yi Zhang
Summary: Porous carbon materials have excellent performance in various energy and environment-related applications. However, the high cost and potential environmental pollution associated with the preparation process remain significant issues. This paper provides an overview of common and emerging methods for preparing porous carbon materials, as well as recent applications as electrodes for supercapacitors.
Article
Chemistry, Physical
Chaoping Jiang, Denghui Zhu, Nan Wang, Yongnan Chen, Yuanpeng An, Qinyang Zhao, Yiku Xu, Zhimin Hou, Yongqing Zhao
Summary: The crack propagation behaviors and fracture mechanism of CT20 alloy with lamellar alpha were investigated at temperatures ranging from 20 to -90 degrees C. The results showed a decrease in fracture toughness from 430.89 KJ/m2 to 171.67 KJ/m2, with a change in fracture mechanism from ductile fracture to quasi-cleavage fracture at lower temperatures. The reduction in fracture toughness was mainly influenced by the crack tip plastic zone and the tortuosity of the crack propagation path. The contribution of the internal factor increased with decreasing temperature, indicating the significant influence of the plastic zone on crack propagation behaviors. Deformation of the lamellar alpha inhibited crack propagation at 20 degrees C, while a reduction in the plastic zone at -90 degrees C accelerated crack propagation and decreased fracture toughness.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Environmental Sciences
Nan Wang, Yuetian Shi, Yinzhu Cheng, Fanchao Yang, Geng Zhang, Siyuan Li, Xuebin Liu
Summary: Hyperspectral anomaly detection (HAD) is a technique for finding observations without prior knowledge in remote sensing object detection. This study proposes an unsupervised strategy for HAD that uses dimensionality reduction and prior-based collaborative representation. Experimental results show that the proposed method outperforms alternative detectors on multiple datasets.
JOURNAL OF APPLIED REMOTE SENSING
(2023)
Article
Environmental Sciences
Nan Wang, Yuetian Shi, Haiwei Li, Geng Zhang, Siyuan Li, Xuebin Liu
Summary: Hyperspectral anomaly detection (HAD) is an important technique for object-based image analysis. This study proposes a Multi-Prior Graph Autoencoder (MPGAE) for HAD, which utilizes band selection, adaptive salient weight, and graph autoencoder. Experimental results demonstrate that the proposed MPGAE outperforms other state-of-the-art HAD detectors.
