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Constrained Consensus of Continuous-Time Heterogeneous Multi-Agent Networks with Nonconvex Constraints and Delays

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Journal of Systems Science & Complexity 2022年第1期35卷 105-122页

作者： MO Lipo YU Yongguang ren Guojian yuan Xiaolin School of Mathematics and Statistics Beijing Technology and Business UniversityBeijing 100048China Key Laboratory of Power Big Data of Guizhou Province Guizhou Institute of TechnologyGuiyang 550003China. Department of Mathematics Beijing Jiaotong UniversityBeijing 100044China

This paper studies the continuous-time constrained consensus of heterogeneous multi-agent networks with nonconvex input and velocity constraints,where each agent’s dynamic is modeled by a first-order or second-order integrator,the communication delays are assumed to be time-varying,nonuniform,bounded and the communication graph is changing over *** improved distributed control algorithm with time-varying gains is proposed and the heterogeneous consensus is changed into the homogeneous consensus by a coordination ***,it is proved that the constrained consensus can be reached by analyzing six connection cases between agents if the joint graph has a directed spanning tree over each bounded ***,simulations are done to show the correctness of the theorem.

关键词： Consensus continuous-time heterogeneous networks nonconvex constraints time-delays

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Decentralized and overall condition monitoring system for large-scale mobile and complex equipment

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Journal of Systems Engineering and Electronics 2007年第4期18卷 758-763页

作者： Cao Jianjun Zhang Peilin ren Guoquan fu Jianping Dept. of Artillery Engineering Mechanical Engineering Coll. Shijiazhuang 050003 P. R. China Coll. of Mechanical Engineering Nanjing Univ. of Science and Technology Nanjing 210094 P. R. China

It is an urgent project to realize online and overall condition monitoring and timely fault diagnosis for large-scale mobile and complex equipment. Moreover, most of the existing large-scale complex equipment has quite insufficient accessibility of examination, although it still has quite a long service life. The decentralized and overall condition monitoring, as a new concept, is proposed from the point of view of the whole system. A set of complex equipment is divided into several parts in terms of concrete equipment. Every part is processed via one detecting unit, and the main detecting unit is connected with other units. The management work and communications with the remote monitoring center have been taken on by it. Consequently, the difficulty of realizing a condition monitoring system and the complexity of processing information is reduced greatly. furthermore, excellent maintainability of the condition monitoring system is obtained because of the modularization design. Through an application example, the design and realization of the decentralized and overall condition monitoring system is introduced specifically. Some advanced technologies, such as, micro control unit （MCU）, advanced RISC machines （ARM）, and control area network （CAN）, have been adopted in the system. The system＇s applicability for the existing large-scale mobile and complex equipment is tested.

关键词： condition monitoring fault diagnosis micro control unit information fusion

Fabrication strategies of porous precious-metal-free bifunctional electrocatalysts for overall water splitting:Recent advances

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Green Energy & Environment 2021年第5期6卷 620-643页

作者： Jin-Tao ren Yali Yao Zhong-Yong yuan Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education) Institute of New Catalytic Materials ScienceSchool of Materials Science and EngineeringNankai UniversityTianjin300350China Institute for the Development of Energy for African Sustainability College of ScienceEngineering and TechnologyUniversity of South AfricaJohannesburgSouth Africa

Electrocatalytic water splitting using power generated from renewable energy to produce hydrogen has been considered as one of the more attractive approach to alleviate the problems of energy crisis and environmental *** of the biggest challenges for the large-scale application of water electrolysis is the searching of the low cost electrocatalysts with high and stable activity toward both hydrogen evolution reaction(HER)and oxygen evolution reaction(OER).The well-developed porous features of materials synthesized from the earth abundant elements endow them with the enhanced mass transfer and improved electronic interconnection during electrochemical reactions,resulting in the excellent electrocatalytic performance for both OER and ***,this review focuses on the recent development of innovation strategies for the fabrication of porous non-noble-metal materials including heteroatom-doped carbon-based and transition metal(mainly Co,Ni,and Fe)-based materials as efficient electrocatalysts for overall water ***,a detailed discussion of the structure–activity correlation gives an insight on the origin of the high electrocatalytic performance of porous materials obtained from different strategies,and provides guidance for future design and preparation of highly efficient electocatalysts based on non-precious carbon or metal materials for overall water splitting.

关键词： Electrocatalysis Porous materials Hydrogen evolution Oxygen evolution Overall water splitting

Guide Rules for Electronic Atlas Project in China

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Geo-Spatial Information Science 2006年第1期9卷 71-75页

作者： ren fu DU Qingyun Key Laboratory of Geographic Information System Ministry of Education School of Resource and Environment Science Wuhan University 129 Luoyu Road Wuhan 430070 China

Electronic atlas project (E-atlas project) plays a n important role in the procedure of popularizing maps and is diversifying its a pplication widely in China. Practice for E-atlas projects is a basic approach f or achieving public accessibility to national spatial data infrastructure (N SDI) and meets people’s inherent needs of updated maps. This paper provides a d escription and assessment of an integration of E-atlas projects, analyzes curre nt progress and characters of E-atlas project, summarizes basic guide rules, an d provides solution and interpretation. It depicts a conceptual framework of an authoring toolkit that is driven by application of E-atlas on the basis of succ essful instances. The toolkit which improves interactive interface, decreases op erational difficulties is developed in Visual C++ and used widely in China.

关键词： electronic atlas project multimedia atlas electronic atlas

A review of automatic detection of epilepsy based on EEG signals

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Journal of Semiconductors 2023年第12期44卷 8-30页

作者： Qirui ren Xiaofan Sun Xiangqu fu Shuaidi Zhang Yiyang yuan Hao Wu Xiaoran Li Xinghua Wang Feng Zhang Laboratory of Microelectronic Devices&Integrated Technology Institute of Microelectronics of the Chinese Academy of SciencesBeijing 100029China School of Integrated Circuits University of Chinese Academy of SciencesBeijing 101408China School of Information and Electronics Beijing Institute of TechnologyBeijing 100081China

Epilepsy is a common neurological disorder that occurs at all *** not only brings physical pain to patients,but also brings a huge burden to the lives of patients and their *** present,epilepsy detection is still achieved through the observation of electroencephalography(EEG)by medical ***,this process takes a long time and consumes energy,which will create a huge workload to medical ***,it is particularly important to realize the automatic detection of *** paper introduces,in detail,the overall framework of EEG-based automatic epilepsy identification and the typical methods involved in each *** at the core modules,that is,signal acquisition analog front end(AFE),feature extraction and classifier selection,method summary and theoretical explanation are carried ***,the future research directions in the field of automatic detection of epilepsy are prospected.

关键词： epilepsy electroencephalography automatic detection analog front end feature extraction classifier

Research on new software compensation method of static and quasi-static errors for precision motion controller

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2007年第12期8卷 1938-1943页

作者： ren Kun fu Jian-zhong CHEN Zi-chen Department of Mechanical Engineering Zhejiang University Hangzhou 310027 China

To reduce mechanical vibrations induced by big errors compensation, a new software compensation method based on an improved digital differential analyzer (DDA) interpolator for static and quasi-static errors of machine tools is proposed. Based on principle of traditional DDA interpolator, a DDA interpolator is divided into command generator and command analyzer. There are three types of errors, considering the difference of positions between compensation points and interpolation segments. According to the classification, errors are distributed evenly in data processing and compensated to certain interpolation segments in machining. On-line implementation results show that the proposed approach greatly improves positioning accuracy of computer numerical control (CNC) machine tools.

关键词： Static and quasi-static errors Positioning and machining accuracy Digital differential analyzer (DDA) interoolator

Conceptual design and control method for a noncontact annular electromagnetic stabilized satellite platform

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Chinese Journal of Aeronautics 2024年第1期37卷 256-270页

作者： He LIAO Daixin WANG yuan ren Weijie WANG Institute of Astronautics Nanjing University of Aeronautics and AstronauticsNanjing 211106China Department of Basic Course Space Engineering UniversityHuairou DistrictBeijing 101416China

Disturbance-Free Payload(DFP)spacecraft can meet the requirements of ultra-high attitude pointing accuracy and stability for future space ***,as the main control actuators of DFP spacecraft,Linear Non-Contact Lorentz Actuators(LNCLAs)have control output problems with six-degree-of-freedom coupling and nonlinear effects,which will affect the attitude control performance of DFP *** solve this problem,a novel concept for Non-Contact Annular Electromagnetic Stabilized Satellite Platform(NCAESSP)is proposed in this *** concept is centered on replacing the LNCLAs with a non-contact annular electromagnetic actuator to solve the two problems mentioned ***,for the different control requirements of the payload module and the support module of the NCAESSP,a high-precision attitude controller based on the robust model matching method and a dual quaternion-based adaptive sliding mode controller are ***,the simulation results verify the feasibility and effectiveness of the proposed approach.

关键词： Disturbance-free payload Robust model matching Dual quaternion Sliding mode control Collision avoidance

Method of analyzing vibration characteristics of armature system of hermetically sealed electromagnetic relay

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2007年第3期8卷 434-438页

作者： ren Wan-bin CUI Li LUO fu-biao ZHAI Guo-fu School of Electrical Engineering and Automation Harbin Institute qf Technology Harbin 150001 China Guilin Aerospace Electronics Company Guilin 541002 China

Published research is minimal on vibration characteristics of hermetically sealed electromagnetic relay (EMR) ex- posed to mechanical environment. The vibration characteristics of armature system, link contact system with electromagnetic system will cause EMR malfunction. The nonlinear dynamics model of armature systems was studied by considering electro- magnetic attraction force and opposite mechanical force in this paper. Angular displacements of armature under different sinu- soidal vibration conditions are solved in order to obtain the failure mode result from armature system. Vibration tests showed the presented analyzing method is suitable for EMR. The conclusions are instructive for increasing vibration resistance of armature systems of EMR, and are significant for reliability design of switch apparatus.

关键词： Hermetically sealed electromagnetic relay (EMR) Armature system Vibration characteristics Analyzing method

Analysis on Deflection Characteristics of Steel Cable-Stayed Bridge

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Transactions of Nanjing University of Aeronautics and Astronautics 2018年第5期35卷 890-895页

作者： Liu Xiaoling Huang Qiao ren yuan Faculty of Maritime and Transportation Ningbo University School of Transportation Southeast University

Various kinds of deflection characteristics on the steel cable-stayed bridge(Nanjing No.3 Yangtze River Bridge)are investigated by different mathematical statistical ***,via Pearson correlation coefficient calculation,it shows good consistency between the adjacent measuring point of side span or middle ***,taking mid-span deflection as an example,the correlation analysis of deflection and temperature is *** are synchronous via cross correlation coefficient calculation but not completely linear and a"hysteresis loop"phenomenon of three stages is *** fitting result on the monitoring data at day time is consistent with the numerical value through the application of unit temperature difference between the cable and girder and the positive temperature gradient of girder in the finite element *** the temperature effect is *** loads effect is obtained from wavelet *** extracted curve can indirectly reflect the change of traffic ***,the structural damage is analyzed through the trend fusion on the deflection,cable force and visual inspection from 2006 to *** conclusions can provide a basis for management departments to carry out special detection.

关键词： steel cable-stayed bridge health monitoring deflection characteristics analysis