Article
Engineering, Mechanical
Shuai Yang, Xueqing Jiang, Shaolin Zhang, Hong Guo, Shaoqi Cen
Summary: This study proposes a theoretical and experimental investigation of the thermodynamic lubrication and stability properties of a conical hydrostatic/hydrodynamic floating ring bearing. The finite element method and finite difference method are used to solve the variable-viscosity Reynolds equations and thermal energy equations, and the conical bearing-rotor dynamic and stability performance models are built. Experimental measurements validate the accuracy of the mathematical model's temperature distribution, highlighting the importance of considering thermal effects in bearing lubrication analysis and design.
JOURNAL OF TRIBOLOGY-TRANSACTIONS OF THE ASME
(2023)
Article
Engineering, Mechanical
Yi Zhang, Wei Wang, Daogao Wei, Gang Wang, Jimin Xu, Kun Liu
Summary: The study investigates the potential unstable vibration phenomena of the floating-ring bearing supported turbocharger rotor system in high-speed and high-temperature environments. A numerical model is used to analyze its nonlinear vibration behavior and a method to avoid fluid-induced instability is proposed.
TRIBOLOGY INTERNATIONAL
(2022)
Article
Engineering, Mechanical
Shuai Yang, Junxing Hou, Xiaodong An, Shuanghui Xi
Summary: The study investigates the influence of ring elastic deformation on the performance of a hydrodynamic/hydrostatic FRB using finite element method and finite difference method to solve thermohydrodynamic lubrication models. The findings show that the deformation value increases with the growth of shaft speed and the minimum film thickness declines with the growth of inlet temperature.
INDUSTRIAL LUBRICATION AND TRIBOLOGY
(2023)
Article
Engineering, Mechanical
Liqiang Peng, Lixin Wang, Zhiying Qin, Huiping Zheng, Zhanqun Shi
Summary: In this study, the starved lubrication characteristics of floating ring bearing were investigated through theoretical modeling and numerical simulation. A theoretical model of starved-boundary lubrication for floating ring bearing was established based on the Reynolds equation, and an oil-film ratio coefficient was introduced to reflect the degree of starved lubrication. The influence of inlet-boundary conditions on the starved-lubrication performance of floating ring bearings was analyzed. The study provides a theoretical basis for the fault detection of floating ring bearing.
Article
Engineering, Mechanical
Zhongliang Xie, Jian Jiao, Kang Yang
Summary: Traditional water-lubricated bearings face challenges in forming effective lubricating film under extreme low-speed and heavy-duty conditions, leading to shortcomings such as low-load, high-resistance, high-vibration, and high-noise. The paper proposes a novel multi-field coupling lubrication model to investigate the mixed lubrication performances and critical characteristics of these bearings. By developing functional mapping relationships and building rotor dynamic models, the paper reveals the variation mechanisms of dynamic behaviors and verifies the correctness of the model and algorithm through theoretical analysis and experiment. The academic value of this research is expected to achieve a novel breakthrough in forming effective hydrodynamic film under extreme severe conditions for water-lubricated bearings.
TRIBOLOGY INTERNATIONAL
(2023)
Article
Engineering, Mechanical
Zhongliang Xie, Weidong Zhu
Summary: The paper investigates the static and dynamic lubrication parameters of the floating ring bearing (FRB) by proposing modified lubrication models and utilizing multiscale methods to enhance calculation accuracy and efficiency. The study analyzes the influence of various factors on lubrication performances and concludes that the clearance ratio affects the inner oil film while the vertical load influences the bearing's lubrication performances. These conclusions are applicable to similar floating ring bearings.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2022)
Article
Engineering, Mechanical
Clement Eberhardt, Robin Kurth, Christian Kraft, Hubert Schwarze, Thomas Paessler, Markus Bergmann, Matthias Putz
Summary: The study introduces the concept of an intelligent hybrid plain bearing (IHPB), which combines hydrodynamic and hydrostatic characteristics to enhance the load capacity and lubrication performance of the bearing.
JOURNAL OF TRIBOLOGY-TRANSACTIONS OF THE ASME
(2021)
Article
Engineering, Mechanical
Karimulla Shaik, B. K. Dutta
Summary: The paper discusses the stability of a flexible rotor on a horizontal rigid bearing, highlighting the impact of factors such as shaft flexibility, damper support flexibility, damper mass, and turbulence on stability. Insertion of turbulence decreases stability thresholds.
TRIBOLOGY INTERNATIONAL
(2021)
Article
Mechanics
Peng Li, Hao Zhang, Xin Li, Zhanqun Shi, Sen Xiao, Fengshou Gu
Summary: The paper investigates the effect of manufacturing errors and misalignment on the lubrication behavior of journal bearings with micro-groove under dynamic loads. A mixed lubrication model is developed, considering factors such as mass conservation cavitation algorithm, asperity contact model, and force balance equation. The performance parameters of bearings with different surface profiles and micro-groove distributions are analyzed, and the results show that manufacturing errors and misalignment have a significant impact on the transient behavior of journal bearings.
Article
Chemistry, Physical
Shaoxian Bai, Dongdong Chu, Chunhong Ma, Jing Yang, Shiyi Bao
Summary: The force equilibrium and moment equilibrium are crucial for the sealing performance of gas split floating ring seals. The deflection angle and frictional heat of surface contact are taken into consideration in the thermo-hydrodynamic lubrication analysis of gas split floating ring seal with Rayleigh grooves to understand the hydrodynamic characteristics and rules in high-temperature and high-speed conditions. Numerical calculations are performed to determine the pressure and temperature distributions of sealing rings for various conditions, and the hydrodynamic effect and sealing performance are analyzed. The results show that a significant hydrodynamic effect is achieved when a deflection angle of about dozens of micro radians is present in the split seal ring. Increasing deflection angle and rotational speed further enhance the hydrodynamic effect. The increase in rotational speed also leads to a higher film temperature. Additionally, the increase in ambient temperature significantly reduces leakage rate but has no significant effect on the opening force. This proposed model can provide theoretical basis and design guidance for surface grooves of gas split floating ring seal in the future.
Article
Computer Science, Interdisciplinary Applications
Takuji Ishikawa
Summary: This study proposes a novel hybrid method combining lubrication theory (LT) and boundary element method (BEM) called LT-BEM, which can accurately calculate the rheological and diffusion properties of small particle suspensions. The LT-BEM successfully captures the asymptotic nature of forces and torques acting on two spheres and dramatically improves the accuracy of squeezing force, preventing particle overlap. It is applicable to various shapes of particles and demonstrated advantages in applications involving pairwise microswimmers and bacteria interactions.
JOURNAL OF COMPUTATIONAL PHYSICS
(2022)
Article
Mechanics
Farrukh Kamoliddinov, Ivan U. Vakarelski, Sigurdur T. Thoroddsen
Summary: Through varying the pulling force, we investigate the hydrodynamic regimes of a floating sphere on a water surface, observing transitions from low to high Froude number regimes as the force increases.
Article
Engineering, Mechanical
Simon Stephan, Sebastian Schmitt, Hans Hasse, Herbert M. Urbassek
Summary: Lubricated contact processes were studied through molecular dynamics simulations, covering the entire range of the Stribeck curve. The lateral movement of solid bodies at different gap heights was studied, with methane and decane as lubricants. The study revealed three lubrication regimes and their transition regions: boundary lubrication, mixed lubrication, and hydrodynamic lubrication. The formation of a tribofilm, where lubricant molecules are immersed into the metal surface, was found to have important consequences for the contact process. The behavior of methane and decane in the three lubrication regimes differed due to the different mechanisms observed for tribofilm formation.
Article
Engineering, Mechanical
He Li, Junkai Niu
Summary: This paper investigates the impact of texture on the tribological performance of journal bearings operating under starvation lubrication conditions. The P-theta model with mass conservation boundary conditions accurately predicts the oil film distribution in the full oil film/starvation region of the textured bearing. The study discusses the effects of different levels of starvation lubrication on parameters such as eccentricity, attitude angle, full film area, and friction coefficient in textured bearings. The results show that the severity of the texture's effect on bearing performance varies with starvation levels and that texturing can improve the bearing's operating performance, increase load carrying capacity, reduce friction coefficient, and enhance safety.
SURFACE TOPOGRAPHY-METROLOGY AND PROPERTIES
(2023)
Article
Chemistry, Multidisciplinary
Hao Dong, Nichole Moyle, Haibin Wu, Constantine Yuri Khripin, Chung-Yuen Hui, Anand Jagota
Summary: Lubricated contacts in soft materials are common in various applications. The transition between elasto-hydrodynamic lubrication (EHL) and mixed lubrication (ML) regimes governs the minimum sliding friction achievable. Previous belief held that the transition occurs when the thickness of the lubricant layer is comparable with the amplitude of surface roughness, but this study found that the transition can occur when the thickness of the liquid layer is much larger than the height of the asperities. Direct visualization showed the formation of wave-like surface wrinkles triggering the transition to the mixed regime.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Medicinal
Peng-Li Zhang, Lavanya Gopala, Shao-Lin Zhang, Gui-Xin Cai, Cheng-He Zhou
Summary: The study introduced a novel antibacterial framework and demonstrated through experiments that the new compound exhibited strong inhibition against MRSA, showed excellent membrane selectivity, and effectively alleviated bacterial resistance.
EUROPEAN JOURNAL OF MEDICINAL CHEMISTRY
(2022)
Article
Chemistry, Analytical
Zi Wang, Liang Shan, Yucun Zhou, Tao Yuan, Shaolin Zhang, Guangzhong Xie, Wanlei Gao, Qinghui Jin, Jiawen Jian, Jie Zou
Summary: This study presents a novel ammonia sensor based on BZY electrolytes, which shows a low detection limit, high sensitivity, selectivity and repeatability at a relatively low working temperature.
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
(2022)
Article
Chemistry, Medicinal
Xiaohong Yang, Zhi-Peng Wang, Sichuan Xiang, Daoqiang Wang, Yi Zhao, Dong Luo, Yanfei Qiu, Chao Huang, Jian Guo, Yuanwei Dai, Shao-Lin Zhang, Yun He
Summary: A library of novel CAA analogues was synthesized, among which compound F16 exhibited superior water solubility and antiproliferative activities compared to CAA. Mechanism studies confirmed that F16 acted as a dual Topo I and II poison and displayed potent antiproliferative activities against high Topo I and II expression cell lines. In xenograft models, F16 reduced tumor growth without apparent effect on mouse weight, making it a promising lead for the development of novel dual Topo I and II antitumor agents.
JOURNAL OF MEDICINAL CHEMISTRY
(2022)
Article
Chemistry, Physical
Hongtao Wang, Shaolin Zhang, Guangxi Li
Summary: This paper presents an experimental study on the effect of milling processing parameters on milling forces and surface topography of the 2195 aluminum-lithium alloy. The results show that longitudinal-torsional ultrasonic vibration milling technique has advantages such as variable depth of cut and chip pulling, which result in reduced milling forces and improved surface quality. The study provides parameter selection for subsequent machining of aluminum-lithium alloy and fills the research gap in longitudinal torsional ultrasonic vibration machining of the 2195 aluminum-lithium alloy.
Article
Chemistry, Analytical
Yumei Li, Huijia Hu, Weifeng Zhang, Ziqi Tian, Xiaoqing Jiang, Yuheng Wang, Shaolin Zhang, Qiuju Zhang, Jiawen Jian, Jie Zou
Summary: This study used density functional theory to analyze the effect of Au doping on the performance of nitrogen oxide sensors in automobiles. It was found that Au can effectively weaken the adsorption energy of NO on platinum surfaces, thereby inhibiting the dissociation of NO.
Article
Green & Sustainable Science & Technology
Jin Yang, Yuanzhen Tang, Xingyang He, Ying Su, Jingyi Zeng, Mengyang Ma, Linghao Zeng, Shaolin Zhang, Hongbo Tan, Bohumir Strnadel
Summary: Geopolymer made from fly ash is a potential environmentally friendly and inexpensive alternative to high-emission cement production. In this study, wet-milling mechanical force and calcium hydroxide were used to prepare high-performance alkaline calcium activated geopolymers. Increasing the content of calcium hydroxide improved the strength and chloride resistance of the geopolymers, but also increased the autogenous shrinkage. Wet-milled fly ash geopolymers showed even greater improvements due to the pre-depolymerization effect of wet-milling and the activation effect of calcium hydroxide. The resulting geopolymers had significantly improved compressive strength and microstructure, and performed better than Portland cement in terms of environmental impact.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Materials Science, Multidisciplinary
Xinmei Xiang, Dehua Shao, Tong Pang, Tuan T. Ngo, Ngoc San Ha, Shaolin Zhang
Summary: This article proposes a biomimetic multilayer foam-filled structure (BMFS) and investigates its lateral compression performance through experimental and numerical analyses. The results show that BMFS exhibits a more advantageous sequential collapse deformation pattern for practical use.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2022)
Article
Chemistry, Medicinal
Ding Huang, Maojie Zhang, Haiyan Zhang, Zhiying Cui, Dong Luo, Tao Li, Xuemin Li, Yun He, Shao-Lin Zhang
Summary: In this study, the toxic effects of mitomycin C (MMC), an anticancer drug, were reduced by attaching triphenylphosphine groups (TPP+) to it. The resulting compound, 5, showed good anticancer activity and negligible toxicity to human normal cells. In mice, 5 had little effect on body weight and tissues, indicating reduced toxicity compared to MMC. These findings suggest that TPP+ can effectively reduce the toxicity of MMC.
BIOORGANIC & MEDICINAL CHEMISTRY LETTERS
(2022)
Article
Engineering, Environmental
Yue Li, Qian-Li Li, Yan Li, Yun-Ling Yang, Shao-Lin Zhang, Jingtai Zhao, Jieqiong Wan, Zhijun Zhang
Summary: Methylammonium lead halide perovskites have poor stability towards moisture. Strategies such as encapsulation and surface engineering can improve moisture stability and optical/electronic performance. In this study, a hydrophobic polymer matrix was used for encapsulation, resulting in a composite film with enhanced fluorescence and improved luminous efficiency. The film also showed high sensitivity and low detection limit for X-ray irradiation.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Civil
Xinmei Xiang, Chenkun Xiao, Ngoc San Ha, Guoxing Lu, Shaolin Zhang, Yijie Liu
Summary: This paper designs bioinspired thin-walled structures based on observations of barnacles and studies their mechanical properties. The effects of the number and amplitude of corrugations on the deformation and energy absorption performance of 3D printed bioinspired tapered tubes are investigated. The results show that properly controlling corrugation parameters can significantly improve energy absorption.
ENGINEERING STRUCTURES
(2023)
Article
Agriculture, Multidisciplinary
Jing Zhang, Narsaiah Battini, Jia-Ming Ou, Shao-Lin Zhang, Ling Zhang, Cheng-He Zhou
Summary: New antibacterial 3-(aminothiazolyl)quinolones were synthesized to combat multidrug resistance in animal husbandry. Bioactive assays showed that N,N-dicyclohexylaminocarbonyl ATQ 10e and methyl ATQ 17a exhibited better antibacterial behavior against Staphylococcus aureus and Pseudomonas aeruginosa than norfloxacin. Mechanism exploration indicated that ATQ 17a could inhibit biofilm formation, disrupt bacterial membrane integrity, bind to intracellular DNA and DNA gyrase, induce reactive oxygen species production, and reduce bacterial metabolism.
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
(2023)
Article
Agronomy
Shaolin Zhang, Qianglong Ma, Shangkun Cheng, Dong An, Zhenling Yang, Biao Ma, Yang Yang
Summary: A crop row detection algorithm based on LiDAR is proposed in this paper for middle and late crop periods, which shows good detection results in high sheltering environments. The algorithm demonstrates accuracy and superiority over the machine vision algorithm, providing a solid foundation for autonomous navigation in agriculture.
Article
Engineering, Mechanical
Hong Guo, Jianqiao Bao, Shaolin Zhang, Minghui Shi
Summary: This paper presents a misaligned journal mixed lubrication model coupling for multiple factors, and applies the finite difference method to calculate the model and experimental validation. The results show that under misalignment conditions, the pressure field, film thickness, and elastic deformation of the bearing have asymmetric distribution and end side effect. Additionally, the frictional force and side leakage flow are enhanced with the increase in inclination angle within a certain range.
Article
Chemistry, Medicinal
Yi-Min Tan, Ya Wang, Shuo Li, Shao-Lin Zhang, Cheng-He Zhou
Summary: A unique class of antibacterial azolylpyrimidinediols (APDs) and their analogues were developed. Some synthesized compounds showed excellent bacteriostatic potency; especially, triazolylpyrimidinediol (triadol PD) 7a exhibited good anti Acinetobacter baumannii potential with a low MIC of 0.002 mmol/ L. Mechanistic explorations revealed that compound 7a without membrane-targeting ability could decrease metabolic activity, interact with DNA through groove binding action to block DNA replication rather than intercalate into and cleave DNA, and thus inhibit bacterial growth.
JOURNAL OF MEDICINAL CHEMISTRY
(2023)
Article
Engineering, Mechanical
Minghui Shi, Hong Guo, Shaolin Zhang, Shujie Chen, Fengcheng Fan
Summary: In this study, surface texture was introduced into ultrasonic levitation bearing to obtain greater load capacity. A theoretical model considering the geometry parameters and mode shape was established and solved using the eight-point discrete grid finite-difference method. The influence of various parameters on load capacity was systematically investigated, and the feasibility of the model was verified using previous experimental results. The results show that positive texture can effectively improve the load capacity of ultrasonic levitation bearing, especially under ultrasonic levitation mode. This research provides insights into the lubrication mechanism of ultrasonic levitation bearing and promotes its practical application in engineering.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART J-JOURNAL OF ENGINEERING TRIBOLOGY
(2023)
