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Asymmetrical regulation of thermal transport in BAs/MoSSe van der Waals heterostructures with applied electric field

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Physical Review B 2024年第20期109卷 205408-205408页

作者： Donghai Wei E Zhou Jinyuan Xu Ailing Chen Hanpeng Xie Fuqing Duan Huimin Wang Zhenzhen Qin Guangzhao Qin State Key Laboratory of Advanced Design and Manufacturing Technology for Vehicle College of Mechanical and Vehicle Engineering Hunan University Changsha 410082 People's Republic of China Hunan Key Laboratory for Micro-Nano Energy Materials & Device and School of Physics and Optoelectronics Xiangtan University Xiangtan 411105 Hunan China Key Laboratory of Materials Physics Ministry of Education School of Physics Zhengzhou University Zhengzhou 450001 China

As a nondestructive regulation method, applying external electric field to regulate thermal transport has become one of the most effective reversible strategies. However, to date, using external electric fields to regulate thermal transport in van der Waals (vdW) heterostructures has been rarely reported, despite the great significance to engineering heat-transfer applications in electronics. Herein, based on the state-of-the-art first-principles calculations, we investigate the external electric field engineered thermal transport in BAs/MoSSe vdW twins heterostructures (i.e., BAs/MoSSe-I and BAs/MoSSe-II), which are constructed from monolayer BAs and Janus MoSSe. The thermal conductivity of different stacked BAs/MoSSe shows similar response to positive electric field. However, with negative electric field applied, the thermal conductivity of BAs/MoSSe-II is 22.4 times higher than that of BAs/MoSSe-I under the strength of −0.2VÅ−1. Detailed analysis reveals that the renormalization of phonons driven by the electric field mainly affects the phonon anharmonicity, which is induced by the electric field enhanced or weakened interlayer interaction, finally leading to the different response of the thermal conductivity for the two stacked BAs/MoSSe. The highly effective regulation of thermal transport in vdW heterostructures driven by the external electric fields as shown in this study is valuable for physical and engineering applications in electronics, thermoelectric, and thermal management.

关键词： First-principles calculations Lattice thermal conductivity Thermal conductivity 2-dimensional systems Honeycomb lattice Surfaces

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design,Characterization and Optimization of Multi-directional Bending Pneumatic Artificial Muscles

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Journal of Bionic engineering 2021年第6期18卷 1358-1368页

作者： Wei Xiao Dean Hu Weixiong Chen Gang Yang Xu Han State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body College of Mechanical and Vehicle EngineeringHunan UniversityChangsha410082People’s Republic of China Key Laboratory of Advanced Design and Simulation Techniques for Special Equipment Ministry of EducationHunan UniversityChangsha410082People’s Republic of China School of Mechanical Engineering Hebei University of TechnologyTianjin300401People’s Republic of China

Bending Pneumatic Artificial Muscles(PAMs)are particularly attractive and extensively applied to the soft grasper,snake-like robot,*** extend the application of PAMs,we fabricate a Multi-directional Bending Pneumatic Artificial Muscle(MBPAM)that can bend in eight directions by changing the pressurized *** maximum bending angle and output force are 151°and 0.643 N under the pressure of 100 kPa,***,the Finite Element Model(FEM)is established to further investigate the *** experimental and numerical results demonstrate the nonlinear relationship between the pressure and the bending angle and output ***,the effects of parameters on the performance are studied with the validated *** results reveal that the amplitude of waves and the thickness of the base layer can be ***,multi-objective optimization is performed to improve the bending performance of the *** optimization results indicate that the output force can be increased by 7.8%with the identical bending angle of the initial design,while the bending angle can be improved by 8.6%with the same output ***,the grasp tests demonstrate the grip capability of the soft four-finger gripper and display the application prospect of the MBPAM in soft robots.

关键词： Pneumatic artificial muscle Multi-directional bending Soft robots Parameter optimization

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Eco-Driving Optimization Method for Heterogeneous CAVs at an Isolated Unsignalized Intersection

Eco-Driving Optimization Method for Heterogeneous CAVs at an...

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2023 IEEE International Conference on Unmanned Systems, ICUS 2023

作者： Cai, Jianjun Liu, Yonggang Que, Wenwei Zhang, Yuanjian Chen, Zheng Chongqing University State Key Laboratory of Mechanical Transmissions Chongqing China Hunan University State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body Changsha China Loughborough University Department of Aeronautical and Automotive Engineering Loughborough United Kingdom Kunming University of Science and Technology Faculty of Transportation Engineering Kunming China

ISBN: (纸本)9798350316308

This paper presents an eco-driving optimization method for heterogeneous connected autonomous vehicles (CAVs) of mixed electric vehicles (EVs) and traditional fuel vehicles (FVs) at an isolated unsignalized intersection. An optimization method is designed to compute the arrival time of each vehicle in the heterogeneous vehicle fleet. Furthermore, we use quadratic programming to optimize the speed trajectory for EVs and the Gauss Pseudospectral method for FVs. Then, an eco-driving optimization method based on a rolling optimization framework that combines the time schedule algorithm and trajectory optimization method is proposed. We make a comparative study with the dynamic programming algorithm and simulation results show that our method outperforms the baselines, where the average energy consumption of EVs and FVs has been reduced by 0.09% and 0.14%, respectively. © 2023 IEEE.

关键词： Energy utilization

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Mechanism Analysis of Drivers’ Risk Response Difficulties for Intelligent Driving safety design and Development: Results from In-Depth vehicle-to-Powered Two-Wheeler Crash Data in China

SSRN

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SSRN 2024年

作者： Wang, Xinghua Hu, Lin Wang, Fang Peng, Yong Wu, Xianhui Xiang, Guoliang School of Automotive and Mechanical Engineering Changsha University of Science and Technology Changsha410114 China Hunan Province Key Laboratory of Safety Design and Reliability Technology for Engineering Vehicle Changsha University of Science and Technology Changsha410114 China The State Key Laboratory of Heavy-duty and Express High-power Electric Locomotive Central South University Changsha41007 China

The intelligent vehicles are considered to be potential in avoiding traffic crashes caused by human errors. Reliable intelligent driving in China requires thorough understanding of complex drivers’ risk response difficulties in Chinese background traffic. Based on actual crashes between a vehicle and a powered two-wheeler (PTW) in China, this study analyzed the mechanism of drivers’ risk response difficulties to theoretically support the intelligent driving safety design and development. 113 crashes recorded in six typical vehicle-to-PTW risk scenarios were selected from the China In-depth mobility safety Study - Traffic Accident (CIMSS-TA) database. The psychological failures and behavioral errors of participants in each risk scenario were analyzed through descriptive statistics. The dominant factors contributory to drivers’ risk response difficulties and their interdependence were explored through 4-item association rule mining (ARM). Furthermore, the characteristics of pre-crash kinematics and the shortcomings of a current approach in identifying potential vehicle-to-PTW crash risks were also discussed based on actual motion data in global and vehicle coordinate systems. The results showed that there was significant heterogeneity in the difficulties encountered by drivers when dealing with various traffic risks. For instance, the information reception failures of drivers (IRF-D) accompanied by the information processing failures of riders (IPF-R) was the most important joint psychological failure pattern in risk scenario 1 and 3, and these crashes were mainly attributed to drivers who failed to yield to straight-going traffic. A typical phenomenon that both participants suffered from information access failures was common in risk scenario 4 and 5, and the crash responsibilities were mainly blamed on these riders running red lights/violating the priority to the right and travelling against the traffic, respectively. Each risk scenario varied dramatically in pre-cr

关键词： Errors

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The effect of creep on the lubrication property of rubber-plastic composite water-lubricated bearings 7

The effect of creep on the lubrication property of rubber-pl...

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7th IEEE International Conference on Transportation Information and safety, ICTIS 2023

作者： Guo, Xu Zhou, Xincong Luo, Bin Zou, Qun Wang, Yanhong Huang, Jian Wuhan University of Technology School of Transportation and Logistics Engineering Wuhan China Wuhan University of Technology State Key Laboratory of Maritime Technology and Safety Wuhan China China Ship Development and Design Center Wuha China Wuhan University of Technology School of Naval Architecture Ocean and Energy Power Engineering Wuhan China Wuhan University of Technology Reliability Engineering Institute Wuhan China

ISBN: (纸本)9798350308532

The deformation of water-lubricated bearings liner has a direct effect on lubrication properties. However, creep deformation is a key factor that has often been neglected in water-lubricated bearing design, manufacture, and operation. This paper investigated the creep deformation of rubber-plastic composites with different thicknesses. The creep effect on lubrication performance was also discussed. Creep tests were conducted using an electronic universal tensile tester. Based on the test results, the creep constitutive equation for rubber-plastic composites was determined. The lubrication model based on the creep constitutive equation was established to evaluate the water film pressure and thickness. The results showed that creep reduces the water film pressure and thickness of the water-lubricated stern bearing, and results in the loading region contraction. The shape contraction position of the water film shape in the outlet area shifts to the central position, and the depth of the contraction depression decreases. By reducing the thickness of the rubber-plastic composite, the water film pressure and thickness are increased. The shape of the water film in the outlet area shrinks and the position gradually shifts away from the center. © 2023 IEEE.

关键词： Rubber

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Yolk-Shell P3-Type K_(0.5)[Mn_(0.85)Ni_(0.1)Co_(0.05)]O_(2):A Low-Cost Cathode for Potassium-Ion Batteries

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Energy & Environmental Materials 2022年第1期5卷 261-269页

作者： Jiaxin Hao Ke Xiong Jiang Zhou Apparao M.Rao Xianyou Wang Huan Liu Bingan Lu School of Physics and Electronics State Key Laboratory of Advanced Design and Manufacturing for Vehicle BodyHunan UniversityChangsha 410082China Key Laboratory of Environmentally Friendly Chemistry and Applications of Ministry of Education Hunan Province Key Laboratory of Electrochemical Energy Storage and ConversionSchool of ChemistryXiangtan UniversityXiangtan 411105China School of Materials Science and Engineering Central South UniversityChangsha 410083China Department of Physics and Astronomy Clemson Nanomaterials InstituteClemson UniversityClemson SC 29634USA College of Materials Science and Engineering Hunan University of Scienceand TechnologyXiangtan 411201China Fujian Strait Research Institute of Industrial Graphene Technologies Quanzhou 362000China

Low-cost preparation methods for cathodes with high capacity and long cycle life are crucial for commercializing potassium-ion batteries(PIBs).Presently,the charging/discharging strain that develops in the active cathode material of PIBs causes cracks in the particles,leading to a sharp capacity ***,to abate the strain release and the need for an industrially relevant process,a simple low-cost co-precipitation method for synthesizing yolk-shell P3-type K_(0.5)[Mn_(0.85)Ni_(0.1)Co_(0.05)]O_(2) (YS-KMNC)was *** cathode material for PIBs,the YS-KMNC delivers a high reversible capacity(96 mAh g^(-1) at 20 mA g^(-1))and excellent cycle stability(80.5%retention over 400 cycles at a high current density of 200 mA g^(-1)).More importantly,a full battery assembled with the YS-KMNC cathode and a commercial graphite anode exhibits a high operating voltage(0.5-3.4 V)and an excellent cycling performance(84.2%retention for 100 cycles at 100 mA g^(-1)).Considering the low-cost,simple production process and high performance of YS-KMNC cathode,this work could pave the way for the commercial development of PIBs.

关键词： cathode materials K_(0.5)[Mn_(0.85)Ni_(0.1)Co_(0.05)]O_(2) strain release volume expansion yolk-shell structure

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Rashba effect modulation in two-dimensional A2B2Te6 (A = Sb, Bi;B = Si, Ge) materials via charge transfer

arXiv

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arXiv 2025年

作者： Wu, Haipeng Tian, Qikun Wei, Jinghui Xing, Ziyu Qin, Guangzhao Qin, Zhenzhen Key Laboratory of Materials Physics Ministry of Education School of Physics Zhengzhou University Zhengzhou450001 China State Key Laboratory of Advanced Design and Manufacturing Technology for Vehicle College of Mechanical and Vehicle Engineering Hunan University Changsha410082 China

designing two-dimensional (2D) Rashba semiconductors, exploring the underlying mechanism of Rashba effect, and further proposing efficient and controllable approaches are crucial for the development of spintronics. On the basis of first-principles calculations, we here theoretically design all possible types (common, inverse, and composite) of Janus structures and successfully achieve numerous ideal 2D Rashba semiconductors from a series of five atomic-layer A2B2Te6 (A = Sb, Bi;B = Si, Ge) materials. Considering the different Rashba constant αR and its modulation trend under external electric field, we comprehensively analyze the intrinsic electric field Ein in terms of work function, electrostatic potential, dipole moment, and inner charge transfer. Inspired by the quantitative relationship between charge transfer and the strength of Ein and even the αR, we propose a straightforward strategy of introducing a single adatom onto the surface of 2D monolayer to introduce and modulate the Rashba effect. Lastly, we also examine the growth feasibility and electronic structures of the Janus Sb2Ge2Se3Te3 system and Janus-adsorbed systems on a 2D BN substrate. Our work not only conducts a detailed analysis of A2B2Te6-based Rashba systems, but also proposes a new strategy for efficiently and controllably modulating the αR through the reconfiguration of charge transfer. Copyright © 2025, The Authors. All rights reserved.

关键词： Semiconducting tellurium compounds

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Data-Driven Bipartite Consensus Control for Large Workpieces Rotation of Nonlinear Multi-Robot Systems

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IEEE/CAA Journal of Automatica Sinica 2025年第6期12卷 1144-1158页

作者： Haoran Tan Xueming Zhang Yaonan Wang You Wu Yun Feng Zhongsheng Hou State Key Laboratory of Advanced Design and Manufacturing Technology for Vehicle College of Electrical and Information Engineering Greater Bay Area Institute for Innovation Hunan University Changsha China National Engineering Laboratory for Robot Visual Perception and Control Technology College of Electrical and Information Engineering Hunan University Changsha China School of Automation Qingdao University Qingdao China

In this paper, a novel data-driven bipartite consensus control scheme is proposed for the rotation problem of large workpieces with multi-robot systems (MRSs) under a directed communication topology. The rotation of a large workpiece is described as the MRSs with cooperation and antagonism interaction. By the signed graph theory, it is further transformed into a bipartite consensus control problem, where all followers are uniformly degenerated into the general nonlinear systems based on the lateral error model. To augment the flexibility of control protocol and improve control performance, a higher-dimensional full form dynamic linearization (FFDL) technique is committed to the MRSs. The control input criterion function consists of the data model based on FFDL and the bipartite consensus error based on the signed graph theory, and the proposed control protocol is given by optimizing this criterion function. In this way, this scheme has a higher degree of freedom and better adaptive adjustment capability while not excessively increasing the control method complexity, and it can also be compatible with other forms of dynamic linearization techniques in MRSs. Further, three matrix norm lemmas are introduced to deal with the challenges of stability analysis caused by higher matrix dimensions and more robots. Finally, the effectiveness of the proposed method is verified by numerical simulations.

关键词： Protocols Linearization techniques Consensus control Numerical simulation Graph theory Stability analysis Data models Topology Multi-robot systems Nonlinear systems

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Research on Pedestrian Protection Simulation Method for Active Hood Lift System

Research on Pedestrian Protection Simulation Method for Acti...

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第三十一届中国汽车工程学会年会暨展览会（SAECCE 2024）

作者： Zhu Xuewu Ji Longbo Wang Deping Li Luoxing State Key Laboratory of Advanced Design and Manufacturing Technology for Vehicle College of Mechanical and Vehicle EngineeringHunan University General Institute of FAW FAW Group CO.Ltd.

This article discusses the development process of active hood lift system( AHLS).In order to obtain the target of AHLS deploying time,human body kinematics analysis is ***,the deployment time and height of the AHLS are investigated through simulation and ***,in order to study the protection effect of active hood lift system( AHLS) on pedestrian head during vehicle collision,the HIC value is *** pedestrian protection performance and star rating results in the deployed and undeployed states are *** can be seen from the percentage of pedestrian scoring rates that the AHLS can greatly improve the pedestrian head impact protection performance.

关键词： active hood lift system(AHLS) deployment time HIC(head injury criterion) pedestrian protection performance

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Mechanical-Computing Metastructure for Self-Powered Vibration Sensing

SSRN

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SSRN 2024年

作者： Pan, Hongbin Zhou, Jiaxi Wang, Kai Wang, Qiang Tan, Dongguo College of Mechanical and Vehicle Engineering Hunan University Changsha410082 China State Key Laboratory of Advanced Design and Manufacturing for Vehicle Changsha410082 China School of Civil Engineering Hunan University of Science and Technology Xiangtan411201 China

Triboelectric nanogenerator-based vibration sensors (TVSs) present a promising approach for online vibration monitoring, offering early detection of excessive vibrations that pose risks to the functionality of devices and infrastructure. However, the structural design of most current TVSs lacks consideration for information processing capabilities, resulting in limited detection bandwidth and displacement signal fidelity. This study first introduces a quasi-zero-stiffness (QZS) mechanical-computing metastructure aimed at enhancing the structural intelligence of TVSs and extending their vibration signal detection bandwidth. The optimization of the QZS metastructure involved adjusting the length ratio and inclination angle of the zero-order polynomial beam to achieve ultra-low resonant frequencies. The results indicate that the TVS based on the mechanical-computing metastructure (MCM-TVS) is capable of efficiently detecting complex random signals, achieving an average measurement accuracy above 85% for the spectral components of random vibration signals. Furthermore, the sensor exhibited remarkable linearity (99%) in measuring vibration amplitude and maintained consistent sensitivity (with less than 25.8% fluctuation), facilitating the lossless conversion of displacement to electrical signals. Consequently, this novel approach of incorporating an MCM into TVS design offers substantial insights for the advancement of high-performance vibration signal monitoring. © 2024, The Authors. All rights reserved.

关键词： Nanogenerators

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