检索结果-内蒙古大学图书馆

ADAPTIVE BOUNDARY control VIBRATION SUPPRESSION OF FLEXIBLE MANIPULATOR BASED ON IMPROVED RBF NEURAL NETWORK

UPB Scientific Bulletin, Series D: Mechanical Engineering 2024年第2期86卷 3-18页

作者： Zheng, Qingchun Wei, Zhiyong Zhu, Peihao Ma, Wenpeng Deng, Jieyong Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control Tianjin University of Technology Tianjin300384 China China School of Mechanical Engineering Tianjin University of Technology Tianjin300384 China Jiangxi Technical College of Manufacturing Jiangxi Nanchang330095 China

With lighter weight, lower power consumption, and higher flexibility, flexible manipulators have been widely used in industrial fields. However, it is easy to produce elastic deformation, resulting in vibration. In this paper, an improved radial basis function (RBF) neural network (NN) for adaptive boundary control is proposed. The partial differential equation (PDE) model of the flexible manipulator is established, and the asymptotic stability of the system is proved by the first Lyapunov method. Finally, simulation results show that the proposed control method can eliminate the low-amplitude angular fluctuation and the high-amplitude angular velocity fluctuation. © 2024, Politechnica University of Bucharest. All rights reserved.

关键词： Flexible manipulators

来源：评论

学校读者我要写书评

暂无评论

Copper-catalyzed oxidative phosphonoheteroarylation of alkenes with phosphonates and N-heteroarenes via P-H/C-H functionalization

引用

Organic Chemistry Frontiers 2022年第2期9卷 476-480页

作者： Chong-Hui Xu Zhi-Qiang Xiong Yang Li Yan-Ping Zhu Jin-Heng Li Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle Nanchang Hangkong UniversityNanchang 330063China School of Pharmacy Key Laboratory of Molecular Pharmacology and Drug EvaluationMinistry of EducationCollaborative Innovation Center of Advanced Drug Delivery System and Biotech Drugs in Universities of ShandongYantai UniversityYantaiShandong264005China State Key Laboratory of Applied Organic Chemistry Lanzhou UniversityLanzhou 730000China School of Chemistry and Chemical Engineering Henan Normal UniversityXinxiangHenan 475004China

A copper-catalyzed oxidative intermolecular phosphonoheteroarylation of alkenes with phosphonates and nucleophilic N-heteroarenes(such as indoles and pyrroles)involving P-H/C-H functionalization for the synthesis of highly valuable β-(N-heteroaryl)-alkylphosphonates is *** method allows the incorporation of two functional groups,a phosphonate and a N-heteroarene,into the alkene in a single reaction step through oxidative formation of the P-centered radicals,addition across the CvC bond,single electron oxidation and C-H functionalization cascades.

关键词： oxidative phosphonate catalyzed

来源：评论

学校读者我要写书评

暂无评论

Corrosion Resistance of Cu-Fe Deformation In-Situ Alloy Under Chloride Ion Environment

SSRN

引用

SSRN 2023年

作者： Xu, Lin Zou, Jin Zeng, Si-Qi Liu, Jun-Wei Hu, Qiang Liu, Ke-Ming Huang, Guo-Jie Jiangxi Key Laboratory for Advanced Copper and Tungsten Materials Jiangxi Academy of Sciences Nanchang330029 China School of Materials Science and Engineering Nanchang Hangkong University 330063 China Jiangxi Key Laboratory for Precision Drive and Control Nanchang Institute of Technology Nanchang330099 China

To research on the corrosion resistance of Cu-Fe deformation in-situ alloy under chloride ion environment, Cu-Fe alloys with various Fe contents (5wt.%, 10wt.%, 14wt.%) were prepared using vacuum induction melting and the effects of Fe content on the corrosion resistance under a chloride ion environment had been investigated. The corrosion morphology and corrosion products were analyzed, the corrosion rate and corrosion period, the dynamic potential polarization curves, electrochemical parameters, and electrochemical impedance spectroscopy with different Fe content were carried out. The research indicated that the addition of iron reduces the corrosion resistance of copper matrix, however, the corrosion resistance of Cu-Fe alloys would increase with the increase of Fe content in a trend of rising and then decreasing, the corrosion rate of Cu-10Fe alloys (95% compression rate) has the best corrosion resistance. With the increase of Fe content, the amount of primary phase Fe dendrites are gradually increased and distributed more densely which causes the increase of dense oxide film on the surface, thus improving the corrosion resistance of the ***, the Fe dendrites appeared to be certain coarsening and non-uniform distribution with the further increase of Fe, the oxide film becomes looser, which leads to a decrease in the corrosion resistance of the alloy. © 2023, The Authors. All rights reserved.

关键词： Corrosion resistance

来源：评论

学校读者我要写书评

暂无评论

Adaptive Backstepping Sliding Mode control of High-speed Train Based on Fuzzy Regulation

Adaptive Backstepping Sliding Mode Control of High-speed Tra...

引用

International Conference on Industrial Artificial Intelligence (IAI)

作者： Yating Fu Junhao Tian Hui Yang State Key Laboratory of Performance Monitoring and Protecting of Rail Transit Infrastructure East China Jiaotong University Nanchang China Key Laboratory of Advanced Control and Optimization of Jiangxi Province East China Jiaotong University Nanchang China School of Electrical and Automation Engineering East China Jiaotong University Nanchang China

In order to meet the operational requirements of the high-speed train in terms of safety, accuracy and smoothness, an adaptive backstepping sliding mode control approach based on fuzzy regulation is put forward in this paper. Firstly, to solve the problem of insufficient accuracy of the single point model, this paper establishes a mass point dynamics model of the high-speed train and sets a compensation term for the model considering the uncertainties in the operation process. Secondly, the adaptive law is designed to estimate the compensation term and the new backstepping sliding mode control strategy is developed. Finally, fuzzy rules are designed to adjust the switching gain of the sliding mode term to suppress jitter. The results of simulation and comparison experiments demonstrate the effectiveness and feasibility of the proposed modeling and control method.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Corrosion Resistance of Cu-Fe Deformation Processed in Situ Alloy in Chloride Ion Environment

SSRN

引用

SSRN 2024年

作者： Xu, Lin Zou, Jin Zeng, Si-Qi Liu, Jun-Wei Liu, Ke-Ming Hu, Qiang Huang, Guo-Jie Jiangxi Key Laboratory for Advanced Copper and Tungsten Materials Jiangxi Academy of Sciences Nanchang330029 China School of Materials Science and Engineering Nanchang Hangkong University 330063 China Gangjiang Innovation Academy Chinese Academy of Sciences Ganzhou341000 China Jiangxi Key Laboratory for Precision Drive and Control Nanchang Institute of Technology Nanchang330099 China

To assess the corrosion resistance of Cu-Fe deformation in situ alloys in a chloride ion environment, Cu-Fe alloys with varying Fe contents (5 wt.%, 10 wt.%, and 14 wt.%) were prepared using vacuum induction melting, and the impact of Fe content on the corrosion resistance was examined. The corrosion morphology and corrosion products were analyzed, and the corrosion rate, corrosion period, dynamic potential polarization curves, electrochemical parameters, and electrochemical impedance spectra with different Fe contents were determined. However, the corrosion resistance of Cu-Fe alloys initially increased with an increase in Fe content before decreasing, with Cu-10 wt.% Fe alloys (95% reduction rate) exhibiting the best corrosion resistance. As the Fe content increased, the amount of primary Fe phase gradually increased and became more densely distributed. This led to an increase in the dense oxide film on the surface, thereby enhancing the corrosion resistance of the material. Moreover, with a further increase in Fe, the primary Fe phase exhibited coarsening and non-uniform distribution. This resulted in the oxide film becoming looser, leading to a decreased corrosion resistance of the alloy. © 2024, The Authors. All rights reserved.

关键词： Corrosion resistance

来源：评论

学校读者我要写书评

暂无评论

Designing Electronic Structures of Multiscale Helical Converters for Tailored Ultrabroad Electromagnetic Absorption

引用

Nano-Micro Letters 2025年第1期17卷 439-455页

作者： Zhaobo Feng Chongbo Liu Xin Li Guangsheng Luo Naixin Zhai Ruizhe Hu Jing Lin Jinbin Peng Yuhui Peng Renchao Che Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle School of Environmental and Chemical EngineeringNanchang Hangkong UniversityNanchang 330063People’s Republic of China School of Physics and Materials Nanchang UniversityNanchang 330031People’s Republic of China Key Laboratory of Nondestructive Testing Ministry of EducationNanchang Hangkong UniversityNanchang 330063People’s Republic of China Laboratory of Advanced Materials Shanghai Key Lab of Molecular Catalysis and Innovative MaterialsAcademy for Engineering and TechnologyFudan UniversityShanghai 200438People’s Republic of China

Atomic-scale doping strategies and structure design play pivotal roles in tailoring the electronic structure and physicochemical property of electromagnetic wave absorption(EMWA)***,the relationship between configuration and electromagnetic(EM)loss mechanism has remained ***,drawing inspiration from the DNA transcription process,we report the successful synthesis of novel in situ Mn/N co-doped helical carbon nanotubes with ultrabroad EMWA *** calculation and EM simulation confirm that the orbital coupling and spin polarization of the Mn–N4–C configuration,along with cross polarization generated by the helical structure,endow the helical converters with enhanced EM *** a result,HMC-8 demonstrates outstanding EMWA performance,achieving a minimum reflection loss of−63.13 dB at an ultralow thickness of 1.29 *** precise tuning of the graphite domain size,HMC-7 achieves an effective absorption bandwidth(EAB)of 6.08 GHz at 2.02 mm ***,constructing macroscale gradient metamaterials enables an ultrabroadband EAB of 12.16 GHz at a thickness of only 5.00 mm,with the maximum radar cross section reduction value reaching 36.4 dB *** innovative approach not only advances the understanding of metal–nonmetal co-doping but also realizes broadband EMWA,thus contributing to the development of EMWA mechanisms and applications.

关键词： Metal-nonmetal co-doping 3d-2p orbital coupling Spin polarization Helical structure Broadband EM wave absorption

来源：评论

学校读者我要写书评

暂无评论

Vision-based formation control of multiple UAVs with event-triggered integral sliding mode control

引用

Cyber-Physical Systems 2020年第4期6卷 231-251页

作者： Chen, Siqing Jin, Xin Zhang, Wenle Tang, Yang Key Laboratory of Advanced Control and Optimization for Chemical Processes of Ministry of Education East China University of Science and Technology Shanghai China

Vision-based formation control offers an alternate solution for unmanned aerial vehicles (UAVs) to work together in the external position system denied environment. In this paper, we present a vision-based formation control strategy with the advantages of high tracking performance and low consumption of communication resources. A vision-based multi-robot localisation methods is applied to get precise position information, and the extended Kalman filter (EKF) is used to fuse measurement data from different sensors. The integral sliding mode controller (ISMC) is utilised to ensure the fast convergence and robustness to the desired formation, and the event-triggered communication scheme is employed to reduce redundant transmission of state information used in the formation controller. The simulation results in Gazebo with a team of three UAVs are given to illustrate the effectness of the proposed control strategy. © 2020 Informa UK Limited, trading as Taylor & Francis Group.

关键词： Extended Kalman filters

来源：评论

学校读者我要写书评

暂无评论

Vision-based trajectory tracking control of quadrotors using super twisting sliding mode control

引用

Cyber-Physical Systems 2020年第4期6卷 207-230页

作者： Wu, Wenhui Jin, Xin Tang, Yang Key Laboratory of Advanced Control and Optimization for Chemical Processes of Ministry of Education East China University of Science and Technology Shanghai China

A trajectory-tracking problem for a vision-based quadrotor control system is investigated in this paper. A super twisting sliding mode (STSM) controller is proposed for finite-time trajectory tracking control. With the help of the homogeneous technique, the closed-loop system is proved to be finite-time stable. In addition, due to the introduction of super twisting mechanism, the controller can restrain chattering effect of sliding mode control. On the other hand, a pose estimation through data fusion is proposed to localise the quadrotor. A Kalman filter (KF) is utilised to fuse the estimated pose from semi-direct monocular visual odometry (SVO) with data from inertial measurement unit (IMU). A number of simulations are carried out on MATLAB and physical engine simulator Gazebo. The results show that the proposed system controller has better performances in terms of robustness and anti-disturbance than the proportional–integral–derivative (PID) controller and the first order sliding mode controller. © 2020 Informa UK Limited, trading as Taylor & Francis Group.

关键词： Closed loop systems

来源：评论

学校读者我要写书评

暂无评论

Assessment of crystal image sharpness during crystallization based on multi-scale feature extraction

Assessment of crystal image sharpness during crystallization...

引用

第33届中国过程控制会议

作者： Jiayu He Tao Liu Ji Fan Yongcan Shuang Key Laboratory of Intelligent Control and Optimization for Industrial Equipment of Ministry of Education Dalian University of Technology Institute of Advanced Control Technology Dalian University of Technology

For the sharpness assessment of crystal images in-situ snapshotted from crystallization process,a novel no-reference sharpness assessment method based on multi-scale feature extraction in spatial and spectral domains is proposed in this ***,the multi-scale re-blurring is performed on crystal images to obtain the multi-scale ***,the sharpness features of crystal images are extracted in multi-scale *** extracting the gradient features,a local maximum gradient pooling algorithm is designed to acquire good ***,the crystal images are down-sampled multiple times to extract multi-scale resolution discrete cosine transform(DCT) domain ***,support vector regression is used to map the feature vectors to quality *** results on the cooling crystallization experiments of β-form L-glutamic acid well demonstrate the effectiveness and advantages of the proposed assessment method.

关键词： Image sharpness assessment in-situ image analysis multi-scale space maximum gradient singular value decomposition multi-scale resolution entropy

来源：评论

学校读者我要写书评

暂无评论

Tendencies of alloyed engineering in BiOX-based photocatalysts:a state-of-the-art review

引用

Rare Metals 2024年第4期43卷 1488-1512页

作者： Yan-Dong Sun Chao Zeng Xue Zhang Zi-Qi Zhang Bo Yang Sheng-Qi Guo Tianjin Key Laboratory of Clean Energy and Pollutant Control School of Energy and Environmental EngineeringHebei University of TechnologyTianjin300401China State-Province Joint Engineering Laboratory of Zeolite Membrane Materials Institute of Advanced MaterialsCollege of Chemistry and Chemical EngineeringJiangxi Normal UniversityNanchang330022China Anhui Province Key Laboratory of Pollutant Sensitive Materials and Environmental Remediation School of Physics and Electronic InformationAnhui Province Industrial Generic Technology Research Center for Alumics MaterialsHuaibei Normal UniversityHuaibei235000China

Energy-saving and environmentally friendly photocatalysis has emerged as a popular research area in response to issues with energy scarcity and environmental *** to the unique layer-like structure,BiOX(Cl,Br,I)is frequently used in ***,inherent flaws in BiOX,such as an inappropriate band gap and low carrier separation efficiency,restrict its capacity for *** to the tunable grouping layer,alloying engineering is employed to optimize the intrinsic properties of BiOX and alloyed BiOX becomes a promising photocatalytic *** review describes the structure of BiOX,where tunable halogen layers provide favorable conditions for the implementation of alloying engineering to improve intrinsic *** article compares the effects and mechanisms of alloying engineering on the optimization of the energy band structure and carrier behavior of BiOX,and lists various modification methods used to improve the optimization of the intrinsic properties by alloying engineering,including defect engineering,morphology control as well as the synergy between alloying and other modification methods(bismuth-rich strategies,cation doping,construction of heterojunctions and plasma resonance effects).Subsequently,applications of alloyed BiOX in energy and environmental fields are summarized,including contaminant degradation,antibacterial,CO_(2)reduction,nitrogen fixation and organic ***,we summarize the current challenges and future directions of alloyed *** is expected that this work will provide guidance and assistance for an in-depth study and understanding of the mechanisms of alloying engineering to optimize intrinsic properties and design alloyed BiOX with higher photocatalytic activity.

关键词： Bismuth oxyhalide Photocatalytic Alloyed engineering Microstructural regulation Application

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：