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13th IEEE International Conference on CYBER technology in Automation, Control, and Intelligent Systems, CYBER 2023

作者： Wang, Tong Kang, Rongjie Xiang, Zhongxia Yuan, Peikang Chang, Le Song, Zhibin Dai, Jian S. School of Mechanical Engineering Key Laboratory of Mechanism Theory and Equipment Design of Ministry of Education Tianjin University Tianjin300072 China Institute for Robotics Southern University of Science and Technology Shenzhen China

ISBN: (纸本)9798350315196

The ankle joint is the most important weight-bearing joint in the human body and is easily injured. Therefore, a lot of research has been carried out on the robotic mechanism of ankle rehabilitation. However, most rehabilitation mechanisms are difficult to apply due to the lack of compliance and adaptability. According to the anatomic structure of an ankle joint, a bio-inspired ankle rehabilitation mechanism driven by cables was designed by simulating antagonistic muscles. The kinematics of the rehabilitation mechanism is then analyzed. Finally, the ankle joint trajectories of five participants were compared in the case of normal movement and using the rehabilitation mechanism, demonstrating the compliance and adaptability of the presented rehabilitation mechanism. © 2023 IEEE.

关键词： Biomimetics

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Microstructural and mechanical behavior of a CoCrFeNiCu_4 non-equiatomic high entropy alloy

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Journal of Materials science & technology 2021年第1期60卷 35-43页

作者： Zijuan Xu Zhongtao Li Yang Tong Weidong Zhang Zhenggang Wu College of Materials Science and Engineering Hunan Province Key Laboratory for Spray Deposition Technology and ApplicationHunan UniversityChangsha 410082China State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body Hunan UniversityChangsha 410082China Materials Science and Technology Division Oak Ridge National LaboratoryOak RidgeTN 37831USA

High entropy alloy(HEA)-based alloy design is experiencing a conceptual broadening from equiatomic alloys to non-equiatomic *** provide experimental basis for designing Cu-rich non-equiatomic HEAs,in the current study,a dual phase(Cu-rich and CoCrFeNi-rich phases) face-centered cubic CoCrFeNiCu_(4) alloy was systematically *** provided initial and experiment-based understanding of the behavioral change of the alloy during a variety of thermal cycles and thermomechanical *** current results indicate that,during heating,preferred precipitation of Cu-rich particles occurs,leading to more pronounced compositional differences between the two constituent FCC phases and increased relative volume fraction of the Cu-rich *** Alloy exhibits a continuous melting and discontinuous solidification of the Cu-rich and CoCrFeNi-rich *** being cold-rolled to ~90 % thickness reduction,the alloy exhibits a recrystallization temperature higher than 800℃.Annealing at 300 and 500℃ led to strength reduction and/or ductility decrease;further increasing annealing temperature monotonically caused softening and ductilization due to decreased density of pre-existing *** yield-drop phenomena observed for the 900℃-and 1000℃-annealed specimens are associated with the locking of pre-existing dislocations by some "atmosphere",the nature of which warrants further elucidation.

关键词： High entropy alloy Non-equiatomic alloy Microstructure Melting and solidification Mechanical behavior

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New speckle pattern interferometry for precise in situ deformation measurements

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Chinese Optics Letters 2024年第1期22卷 34-40页

作者：章如月 Yu Fu 缪泓 CAS Key Laboratory of Mechanical Behavior and Design of Materials Department of Modern MechanicsUniversity of Science and Technology of ChinaHefei 230027China Shenzhen Key Laboratory of Intelligent Optical Measurement and Detection College of Physics and Optoelectronic EngineeringShenzhen UniversityShenzhen 518060China

A new electronic speckle pattern interferometry method is proposed to realize in situ deformation *** feature of the method is the combination of a high-speed camera and multiple laser Doppler vibrometers(LDVs)for synchronous *** high-speed camera is used to record and select effective interferograms,while the LDVs are used to measure the rigid body displacement caused by vibrations.A series of effective interferograms with known shifted phase values are obtained to calculate the deformation *** experimental results show that the method performs well in measuring static and dynamic deformations with high accuracy in vibrating environments.

关键词： speckle pattern interferometry laser Doppler vibrometers in situ deformation measurements

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Oxygen vacancy migration and its lattice structural origin in A-site non-stoichiometric bismuth sodium titanate perovskites

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Journal of Materiomics 2022年第3期8卷 719-729页

作者： Jing Shi Xiao Liu Fangyuan Zhu Wenchao Tian Yuanhua Xia Tangyuan Li Rongrong Rao Tao Zhang Laijun Liu Key Laboratory of Electronic Equipment Structure Design(MOE) School of Mechano-Electronic EngineeringXidian UniversityXi'an710071China School of Materials Science and Engineering Xi'an University of Science and TechnologyXi'an710054China Shanghai Synchrotron Radiation Facility Shanghai Advanced Research InstituteChinese Academy of SciencesShanghai201204China Institute of Nuclear Physics and Chemistry China Academy of Engineering PhysicsMianyang621900China Frontier Institute of Science and Technology Xi'an Jiaotong UniversityXi'an710049China College of Science Xi'an University of Science and TechnologyXi'an710054China Key Laboratory of Nonferrous Materials and New Processing Technology(MOE) College of Materials Science and EngineeringGuilin University of TechnologyGuilin541004China

Off-stoichiometry of perovskite structural Bi0.5Na0.5TiO3(BNT)ferroelectrics can give rise to considerable oxide-ion *** inherent structural characteristics are urgent to be resolved due to its particular sensitivity of the conduction mechanism to the nominal composition and synthesis ***,a thorough study of the temperature-dependent neutron,X-ray diffraction and Raman spectrum is carried out on a series of equivalently substituted A-site deficient non-stoichiometric and pristine *** transition and defect association are systemically investigated in these dominated rhombohedral phases at room temperature,associated with well saturated ferroelectric *** structural evolution identified by Rietveld refinements and the origin of the electrical performance are clarified at elevated temperatures,focusing on the subtle distortions of ionic displacements,oxygen octahedral tilts and local chemical environments for oxygen *** ion migration ability mediated by oxygen vacancies that are not energetically favorable in BNT mainly depends on the external substitutional disorder,and is strongly affected by the dopant *** with the lone pair substitution concept,superior oxide ionic conductivity is achieved,and an alternative strategy is provided in designing BNT based oxide ion conductors.

关键词： Ferroelectrics Bismuth sodium titanate Oxide ion conductors Neutron powder diffraction Oxygen vacancy

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Noninvasive Data-Driven Prediction of reactor Power Field: An MLP-Based Approach

Noninvasive Data-Driven Prediction of Reactor Power Field: A...

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Smart World Congress (SWC), IEEE

作者： Binhui Shi Qi Qiu Helin Gong Qing Li Yang Luo School of Computer University of South China Hengyang China ParisTech Elite Institute of Technology Shanghai Jiao Tong University Shanghai China Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu China

The reactor Operation Digital Twin (RODT) is a numerical representation method designed for the operational phase of nuclear reactors, aiming to solve forward problems (such as state prediction) based on input parameters and inverse problems (such as parameter identification) utilizing additional measurement data, in order to enhance the economic benefits and safety of nuclear power. In this paper, we propose a solution for the forward problem in RODT based on a Multilayer Perceptron (MLP) approach, where the MLP is used to directly learn the mapping relationship from low-dimensional inputs to high-dimensional outputs. Compared to previous methods, the proposed approach shows improved prediction accuracy, especially in situations with limited training data, demonstrating superior generalization capabilities and accuracy. To validate our contributions, we conducted a comparative experiment based on a engineering case, namely the reactor core simulation in the life cycle of a real-world nuclear ractor, which confirmed the effectiveness of the proposed method.

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design and performance analysis of the vacuum system for ion beam sputtering coating machine

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Vacuum 2025年 239卷

作者： Chen, Gengbiao Mo, Can College of Mechanical and Vehicle Engineering Changsha University of Science and Technology Changsha410114 China Key Laboratory of Safety Design and Reliability Technology for Engineering Vehicle Hunan Province Changsha410114 China

A high-performance vacuum system is a critical component of an ion beam sputtering (IBS) coating machine, as a clean, high-vacuum environment is essential for ensuring the quality and uniformity of sputtered coatings. This paper presents the design and performance analysis of a vacuum system tailored for IBS processes. A dual-chamber structure optimized for sputtering operations is proposed, and simulation results confirm stable gas flow and the absence of dead zones during main pump operation. Appropriate pump types are selected, and a vacuum system layout is developed to meet the stringent vacuum requirements of the coating process. To achieve accurate prediction of the system's evacuation time, a segmented pumping speed correction factor is introduced, enabling the construction of a sectional vacuum pumping model. Furthermore, a set of synchronized equipment operation commands is devised to realize efficient and automated vacuum pumping. The experimental results of the automated process closely match the model predictions. Compared to existing machines of the same type, the proposed system achieves ultimate vacuum nearly 2 h faster. © 2025 Elsevier Ltd

关键词： Vacuum pumps

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Dynamic Rod Worth Estimation with Extended Kalman Filter and Background Current Elimination

Dynamic Rod Worth Estimation with Extended Kalman Filter and...

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第40届中国控制会议

作者： Hao Xia Junqi Yang Chao Bao Dalian University of Technology Science and Technology on Reactor System Design Technology Laboratory

The dynamical rod worth method(DRWM) is a fast and accurate method to measure and validate the worth of control rod during the zero power physics test at pressure water nuclear *** control rod worth is obtained from the reactivity change caused by the fast insertion of the control rod into the bottom of the *** reactivity is calculated based the measured ex-core detector signals which normally varies from～10 nA to～10 nA during the rod insertion *** the later stage of the test,as the detector signal becomes～10 nA,the impact of the measurement noise and the gamma-ray background current on the reactivity calculation becomes *** this paper,we developed an extended Kalman filter(EKF) with suitable weighing matrices to filter out the measurement *** most measurement noise filtered out,a background current estimation method is used to eliminate the effect of the background *** combining the background current estimation method with EKF filter,accurate control rod worth is obtained from the real test data.

关键词： Dynamic Rod Worth Method Reactivity Extended Kalman filter Background Current

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Intelligent prediction of slope stability based on visual exploratory data analysis of 77 in situ cases

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International Journal of Mining science and technology 2023年第1期33卷 47-59页

作者： Guangjin Wang Bing Zhao Bisheng Wu Chao Zhang Wenlian Liu Faculty of Land Resources Engineering Kunming University of Science and TechnologyKunming 650093China Yunnan International Technology Transfer Center for Mineral Resources Development and Solid Waste Resource Utilization Kunming 650093China State Key Laboratory of Hydroscience and Engineering Department of Hydraulic EngineeringTsinghua UniversityBeijing 100084China State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhan 430071China China Nonferrous Metals Industry Kunming Survey and Design Research Institute Co.Ltd Kunming 650051China

Slope stability prediction research is a complex non-linear system *** carrying out slope stability prediction work,it often encounters low accuracy of prediction models and blind data *** on 77 field cases,5 quantitative indicators are selected to improve the accuracy of prediction models for slope *** indicators include slope angle,slope height,internal friction angle,cohesion and unit weight of rock and *** data aggregation in the prediction of slope stability is analyzed and visualized based on Six-dimension reduction methods,namely principal components analysis(PCA),Kernel PCA,factor analysis(FA),independent component analysis(ICA),non-negative matrix factorization(NMF)and t-SNE(stochastic neighbor embedding).Combined with classic machine learning methods,7 prediction models for slope stability are established and their reliabilities are examined by random cross ***,the significance of each indicator in the prediction of slope stability is discussed using the coefficient of variation *** research results show that dimension reduction is unnecessary for the data processing of prediction models established in this paper of slope *** forest(RF),support vector machine(SVM)and k-nearest neighbour(KNN)achieve the best prediction accuracy,which is higher than 90%.The decision tree(DT)has better accuracy which is 86%.The most important factor influencing slope stability is slope height,while unit weight of rock and soil is the least *** and SVM models have the best accuracy and superiority in slope stability *** results provide a new approach toward slope stability prediction in geotechnical engineering.

关键词： Slope stability prediction Machine learning algorithm Dimensionality reduction visualization Random cross validation Coefficient of variation

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ABNORMAL GRAIN GROWTH INDUCED BY CYCLIC HEAT TREATMENT IN TIAL ALLOY 1

ABNORMAL GRAIN GROWTH INDUCED BY CYCLIC HEAT TREATMENT IN TI...

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1st International Conference on Mechanical System Dynamics, ICMSD 2022

作者： Chen, Fengrui Qi, Zhixiang Xiao, Sui Feng, Chenming Chen, Yang Zheng, Gong Li, Xiaohai Lei, Ming Chen, Guang MIIT Key Laboratory of Advanced Metallic and Intermetallic Materials Technology Engineering Research Center of Materials Behavior and Design Ministry of Education Nanjing University of Science and Technology Nanjing210094 China

ISBN: (数字)9781839537837

ISBN: (纸本)9781839537837

TiAl alloys are light-weight structural materials developed for high-temperature applications in the field of aeronautic, aerospace, automobile etc. Single crystal or coarse grain structure is beneficial to the high-temperature performance of metallic materials. We report here a cyclic heat treatment (CHT) method to prepare large-sized grains based on abnormal grain growth (AGG) process for TiAl alloys, through which TiAl grains with a maximum length of 70mm was obtained. It was revealed that the subgrain boundary energy introduced by CHT dominates the driving force during AGG. The dynamic process of high-angle grain boundaries migration behavior of AGG was investigated by electron backscatter diffraction, which revealed that the abnormally grown grains had no orientation deviation during the CHT. We have established a kinetic model of α-phase growth. Our result is of great significance to the development of TiAl alloys, providing possibility to prepare large-sized TiAl single crystals and benefiting the design of light-weight mechanical systems. Furthermore, this CHT method is important theoretical guiding significance for the preparation of single crystals or coarse crystals from other metals or ceramic materials. © 2022 IET Conference Proceedings. All rights reserved.

关键词： High temperature applications

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Regulating microstructure and composition by carbonizing in-situ grown metal-organic frameworks on cotton fabrics for boosting electromagnetic wave absorption

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Nano Research 2024年第8期17卷 7290-7300页

作者： Jie Jin Hongsen Long Hu Liu Yan Guo Tiantian Bai Ben Bin Xu Mohammed A.Amin Hua Qiu Mohamed H.Helal Chuntai Liu Changyu Shen Zeinhom M.El-Bahy Zhanhu Guo State Key Laboratory of Structural Analysis Optimization and CAE Software for Industrial EquipmentNational Engineering Research Center for Advanced Polymer Processing TechnologyZhengzhou UniversityZhengzhou 450002China China State Key Laboratory of Powder Metallurgy Central South UniversityChangsha 410000China School of Electronic Engineering North China University of Water Resources and Electric PowerZhengzhou 450046China Complex Conditions of High-end Tire Technology Innovation Center Shuguang Rubber Industry Research&Design Institute Co.LtdGuilin 541004China Integrated Composites Lab Department of Mechanical and Civil EngineeringNorthumbria UniversityNewcastle Upon TyneNE18STUK Department of Chemistry College of ScienceTaif UniversityP.O.Box 11099Taif 21944Saudi Arabia Shaanxi Key Laboratory of Macromolecular Science and Technology School of Chemistry and Chemical EngineeringNorthwestern Polytechnical UniversityXi’an 710072China Department of Chemistry Faculty of Arts and ScienceNorthern Border UniversityRafha 73213Saudi Arabia Department of Chemistry Faculty of ScienceAl-Azhar UniversityNasr City 11884CairoEgypt

High-temperature carbonized metal-organic frameworks(MOFs)derivatives have demonstrated their superiority for promising electromagnetic wave(EMW)absorbers,but they still suffer from limited EMW absorption capacity and narrow *** the advantage of microstructure and chemical composition regulation for the design of EMW absorber,hierarchical heterostructured MoS_(2)/CoS_(2)-Co_(3)O_(4)@cabonized cotton fabric(CF)(MCC@CCF)is prepared by growing ZIF-67 MOFs onto CF surface,chemical etching,and *** from the dual loss mechanism of magnetic-dielectric multicomponent carbonized MOFs,chemical etching and carbonization process can effectively introduce abundant micro-gap structure that can result in better impedance matching and stronger absorption capacity via internal reflection,doped heteroatoms(Mo,N,S)to supply additional dipolar polarization loss,and numerous heterointerfaces among MoS_(2),CoS_(2),Co_(3)O_(4),and CCF that produce promoted conduction loss and interfacial polarization ***,a minimal reflection loss of−52.87 dB and a broadest effective absorption bandwidth of 6.88 GHz were achieved via tunning the sample thickness and filler loading,showing excellent EMW absorption *** research is of great value for guiding the research on MOFs derivatives based EMW absorbing materials.

关键词： metal-organic frameworks hierarchical structure chemical etching sulfurization electromagnetic wave absorption

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