检索结果-内蒙古大学图书馆

Distributed Optimization with Gradient Descent and Quantized Communication

IFAC-PapersOnLine 2023年第2期56卷 5900-5906页

作者： Apostolos I. Rikos Wei Jiang Themistoklis Charalambous Karl H. Johansson Division of Decision and Control Systems KTH Royal Institute of Technology SE-100 44 Stockholm Sweden Digital Futures SE-100 44 Stockholm Sweden Department of Electrical Engineering and Automation School of Electrical Engineering Aalto University Espoo Finland Department of Electrical and Computer Engineering School of Engineering University of Cyprus Nicosia Cyprus

In this paper, we consider the unconstrained distributed optimization problem, in which the exchange of information in the network is captured by a directed graph topology, thus, nodes can only communicate with their neighbors. Additionally, in our problem, the communication channels among the nodes have limited bandwidth. In order to alleviate this limitation, quantized messages should be exchanged among the nodes. For solving this distributed optimization problem, we combine a gradient descent method with a distributed quantized consensus algorithm (which requires the nodes to exchange quantized messages and converges in a finite number of steps). Specifically, at every optimization step, each node (i) performs a gradient descent step (i.e., subtracts the scaled gradient from its current estimate), and (ii) performs a finite-time calculation of the quantized average of every node's estimate in the network. As a consequence, this algorithm approximately mimics the centralized gradient descent algorithm. We show that our algorithm asymptotically converges to a neighborhood of the optimal solution with linear convergence rate. The performance of the proposed algorithm is demonstrated via simple illustrative examples.

关键词： Distributed optimization quantized communication directed graphs finite-time consensus

来源：评论

学校读者我要写书评

暂无评论

Active control of Pantograph Sliding Mode Under Fluctuating Wind Excitation 6th

Active Control of Pantograph Sliding Mode Under Fluctuating ...

引用

6th International Conference on electrical engineering and Information Technologies for Rail Transportation, EITRT 2023

作者： Ren, Zedong Wang, Ying Mu, Xiuqing Chen, Xiaoqiang Chang, Zhanning School of Automation and Electrical Engineering Lanzhou Jiaotong University Lanzhou730070 China Key Laboratory of Optoelectronic Technology and Intelligent Control Ministry of Education Lanzhou730070 China China Railway Lanzhou Bureau Group Co Ltd. Power Supply Department Lanzhou730070 China

ISBN: (纸本)9789819993185

Considering the effects of fluctuating wind excitation on the dynamic performance of the pantograph-catenary coupling system, the ideal contact force between the pantograph and the catenary is taken as the control target, and the control of the pantograph is achieved through an actuator. Firstly, based on the three-mass block pantograph model, a pantograph-catenary coupling model is established for control purposes. Then, the equivalent vibration force on the contact line caused by the fluctuating wind excitation is derived, and the model of the pantograph-catenary system under fluctuating wind excitation is modified. Finally, a sliding-mode control method is adopted to design the pantograph active controller. The results indicate that the designed sliding mode controller is capable of suppressing the vibrations of the pantograph-contact wire system, thereby improving the quality of current collection. © 2024, Beijing Paike Culture Commu. Co., Ltd.

关键词： Sliding mode control

来源：评论

学校读者我要写书评

暂无评论

Improving Robot Safety and Efficiency: Integrating Reachability-Based Trajectory Design with Nonlinear Model Predictive control

SSRN

引用

SSRN 2024年

作者： Shafikhah, Mahmood Razminia, Abolhassan Department of Electrical Engineering Faculty of Intelligent Systems Engineering and Data Science Persian Gulf University Bushehr Iran Process Control Laboratory Faculty of Natural Sciences and Engineering Åbo Akademi University Turku Finland

In today's high-tech world, robots are increasingly used in industry and human assistance, raising safety concerns. This paper proposes a Reachability-based Trajectory Design (RTD) method to ensure safe robot motion. By computing the robot's Forward Reachable Set (FRS), a safe trajectory is chosen for the robot to follow. This approach enhances robot safety and reliability, making them more applicable across industries. Offline RTD and FRS calculations combined with Nonlinear Model Predictive control (NMPC) further improve navigation, motion planning, and control precision. This unique combination significantly improves robot operations, ensuring safety and efficiency. © 2024, The Authors. All rights reserved.

关键词： Predictive control systems

来源：评论

学校读者我要写书评

暂无评论

A Novel Three-Phase Passive Auxiliary Resonant Pole Soft-Switching Inverter With Symmetrical Auxiliary Networks and Electric Energy Feedback Function

引用

International Journal of Circuit Theory and Applications 2025年

作者： Wang, Shuyu Liu, Hongchen Gao, Fei Wheeler, Patrick School of Electrical Engineering and Automation Harbin Institute of Technology Harbin China Department of Engineering Science Shanghai Jiao Tong University Shanghai China Power Electronics Machines and Control Research Institute University of Nottingham Santiago Chile

To solve the problems of high cost, large additional component size, large circulating loss, and complex control in existing auxiliary resonant soft-switching inverters, a three-phase passive auxiliary resonant pole inverter (ARPI) with symmetrical auxiliary networks and electric energy feedback function is proposed. On each phase bridge arm of the inverter, a set of passive auxiliary networks (PANs) without large electrolytic capacitors, transformers, and other devices is provided, which is capable of enhancing the power density of the inverter. Additionally, as the auxiliary commutation circuit does not employ auxiliary switches, it not only lowers the hardware cost but also simplifies the control complexity and enhances the reliability of the soft-switching inverter operation. The proposed topology is capable of enhancing the utilization ratio of DC voltage and reducing the harmonic content of the output waveform. According to the equivalent circuit diagrams in different operating modes, the soft-switching operating principle and realization conditions of soft-switching for the proposed ARPI are analyzed. The parameters of passive components are designed with the aim of minimizing the PAN loss. A 3-kW experimental prototype is constructed. The experimental results indicate that the switching tubes can realize the soft-switching action and suppress the rate of change of voltage and current. The efficiency of the prototype can reach 98.30% at the rated output power, which is a remarkable improvement compared with the same type of ARPIs. © 2025 John Wiley & Sons Ltd.

关键词： Poles

来源：评论

学校读者我要写书评

暂无评论

Temporal Graph Convolutional Network Soft Sensor for Chemical process with Distributed Outputs

Temporal Graph Convolutional Network Soft Sensor for Chemica...

引用

International Conference on Industrial Artificial Intelligence (IAI)

作者： Weiwei Guo Mingwei Jia Weihua Zhou Yi Liu Institute of Process Equipment and Control Engineering Zhejiang University of Technology Hangzhou Department of Mechanical and Electrical Engineering Taizhou Vocational and Technical College Taizhou

To explore data-driven soft sensors and enhance the model explainability, a temporal graph convolutional network is proposed for chemical processes with distributed outputs. It can model process variable relationships in the form of a topology graph. Firstly, the subgraph from prior knowledge is constructed and supplemented using mutual information. In this way, the advantages of both prior knowledge and process data are explored to construct the topology graph. Then, the spatial and temporal dependencies are captured by a graph convolutional layer and a gated recurrent unit, respectively. Finally, a soft sensor based on the spatiotemporal graph convolutional network is established for quality prediction of the chemical process with distributed outputs. The effectiveness of the proposed model is verified by molecular weight distribution prediction of a styrene radical polymerization process.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Steps Toward Industry 5.0:Building“6S”Parallel Industries With Cyber-Physical-Social Intelligence

引用

IEEE/CAA Journal of Automatica Sinica 2023年第8期10卷 1692-1703页

作者： Xingxia Wang Jing Yang Yutong Wang Qinghai Miao Fei-Yue Wang Aijun Zhao Jian-Ling Deng Lingxi Li Xiaoxiang Na Ljubo Vlacic School of Artificial Intelligence University of Chinese Academy of SciencesBeijing 100049China State Key Laboratory of Multimodal Artificial Intelligence Systems Institute of AutomationChinese Academy of SciencesBeijing 100190China IEEE Macao University of Science and Technology Macao 999078China Beijing Engineering Research Center of Intelligent Systems and Technology Chinese Academy of SciencesBeijing 100098 State Key Laboratory for Management and Control of Complex Systems Chinese Academy of SciencesBeijing 100190China North Automatic Control Technology Institute Taiyuan 030006China China Huaneng Group Co. Ltd.Beijing 100031China Department of Electrical and Computer Engineering Indiana University-Purdue University Indianapolis(IUPUI)IndianapolisIN 46202 USA Department of Engineering University of CambridgeCambridgeCB21PZUK School of Engineering and Built Environment Griffith UniversityGold CoastQLD 4222Australia

Very recently,intensive discussions and studies on Industry 5.0 have sprung up and caused the attention of researchers,entrepreneurs,and policymakers from various sectors around the ***,there is no consensus on why and what is Industry 5.0 *** this paper,we define Industry 5.0from its philosophical and historical origin and evolution,emphasize its new thinking on virtual-real duality and human-machine interaction,and introduce its new theory and technology based on parallel intelligence(PI),artificial societies,computational experiments,and parallel execution(the ACP method),and cyber-physical-social systems(CPSS).Case studies and applications of Industry 5.0 over the last decade have been briefly summarized and analyzed with suggestions for its future *** believe that Industry 5.0 of virtual-real interactive parallel industries has great potentials and is critical for building smart *** are outlined to ensure a roadmap that would lead to a smooth transition from CPS-based Industry 4.0 to CPSS-based Industry 5.0 for a better world which is Safe in physical spaces,S ecure in cyberspaces,Sustainable in ecology,Sensitive in individual privacy and rights,Service for all,and Smartness of all.

关键词： ACP artificial intelligence CPS CPSS Industry 4.0 Industry 5.0 parallel industries parallel intelligence

来源：评论

学校读者我要写书评

暂无评论

Disturbance Rejection for Pedaling Rehabilitation Robot Based on Integration of Equivalent-Input-Disturbance and Repetitive control Methods 32

Disturbance Rejection for Pedaling Rehabilitation Robot Base...

引用

32nd IEEE International Symposium on Industrial Electronics, ISIE 2023

作者： Zhou, Yujian She, Jinhua Wang, Feng Iwasaki, Makoto School of Automation China University of Geosciences Wuhan430074 China Hubei Key Laboratory of Advanced Control and Intelligent Automation for Complex Systems Wuhan430074 China Engineering Research Center of Intelligent Technology for Geo-Exploration Ministry of Education Wuhan430074 China Tokyo University of Technology School of Engineering Tokyo Hachioji192-0982 Japan Nagoya Institute of Technology Department of Electrical and Mechanical Engineering Nagoya466-8555 Japan

ISBN: (纸本)9798350399714

This study integrated an improved equivalent-input-disturbance (EID) and a repetitive control methods to ensure reference tracking and enhance disturbance-rejection performance for a pedaling rehabilitation robot. A repetitive controller ensures steady-state tracking of a periodic reference input. An EID estimator with a state observer estimates and compensates for the effect of disturbances generated by patients with lower-limb impairment. The stability condition of the closed-loop system is analyzed based on the Lyapunov stability theory. Simulation results show the effectiveness of this method. © 2023 IEEE.

关键词： Disturbance rejection

来源：评论

学校读者我要写书评

暂无评论

Vulnerability of EV Charging Stations to Cyber Attacks Manipulating Prices

Vulnerability of EV Charging Stations to Cyber Attacks Manip...

引用

Future Energy Solutions (FES), International Conference on

作者： Amirhossein Akbarian Mahdi Bahrami Mehdi Vakilian Matti Lehtonen Electrical Engineering Department Center of Excellence in Power System Management and Control Sharif University of Technology Tehran Iran Department of Electrical Engineering and Automation Aalto University Espoo Finland

Electric vehicles (EVs) have experienced an unprecedented increase in their penetration; in well developed countries; due to the advancement of battery technology and the need to make transportation more environmentally friendly. As a result of this trend, EVs have become an integral part of those countries power grid ecosystem, where they may be used as both a source, and a consumer of energy. However, cybersecurity risks associated with large fleets of EVs within the power grids can significantly impact the normal operation of distribution systems. This paper considers the cyber-attack consequences, from attackers’ perspective. The cyber attackers under study target the charging price (CP) by increasing the CP in off-peak hours and accordingly subsiding it in on-peak hours. A two-stage optimization framework is proposed to identify the most important ultra-fast charging stations (XFCs) under the cyber-attack, meanwhile, the EV users’ response to the compromised CP is considered. Then, the proposed model is implemented on a modified IEEE 123-bus distribution test system, and the effectiveness of the model is proved through some case studies. In particular, they demonstrated that the amount of load shedding is increased by 8.198 MW when the EV user response is taken into account.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Adaptive Optimal Output-Feedback control of Discrete-Time Systems based on Hybrid Iteration

Adaptive Optimal Output-Feedback Control of Discrete-Time Sy...

引用

IEEE Conference on Decision and control

作者： Sitong Liu Weinan Gao Zhong-Ping Jiang State Key Laboratory of Synthetical Automation for Process Industries Northeastern University Shenyang Lianning China Department of Electrical and Computer Engineering Tandon School of Engineering New York University Brooklyn NY USA

ISBN: (数字)9798350316339

ISBN: (纸本)9798350316346

In this paper, a novel adaptive dynamic programming (ADP) algorithm, named output-feedback hybrid iteration (HI),is proposed to address the adaptive optimal control problem of discrete-time linear systems. The proposed output-feedback HI strategy learns the optimal control policy through two phases. First, a novel data-driven value-iteration (VI) scheme is employed to learn an admissible output-feedback control policy using the input/output data without relying on the knowledge of system matrices. Then, with the obtained admissible control policy, the optimal output feedback-control policy is approximated with an accelerated convergence rate through output-feedback policy iteration (PI). Online input/output data are utilized to reconstruct the full state of the system and integrated into the new output-feedback HI algorithm. Simulation results are presented and demonstrate the efficacy and practicality of the proposed output-feedback HI approach in comparison with traditional PI and VI techniques.

关键词： Linear systems Discrete-time systems Adaptive systems Simulation Heuristic algorithms Optimal control Approximation algorithms Dynamic programming Convergence

来源：评论

学校读者我要写书评

暂无评论

Robust H∞ control for uncertain T–S fuzzy systems with state and input time delays: A time-varying matrix-dependent zero-equality method

引用

Journal of the Franklin Institute 2024年第4期361卷

作者： Lin, Huichao Dong, Jiuxiang Park, Ju H. College of Information Science and Engineering Northeastern University Shenyang110819 China The State Key Laboratory of Synthetical Automation for Process Industries Northeastern University Shenyang110819 China Department of Electrical Engineering Yeungnam University Kyongsan38541 Korea Republic of

This paper studies robust H∞ control problems for uncertain T–S fuzzy systems with state and input time delay. A modified Lyapunov–Krasovskii functional is constructed by considering membership-function-dependent matrices and delay-product-type matrices. To ensure that the derived results do not involve higher-order delay terms, a method of introducing augmented variables is used. In particular, a time-varying matrix-dependent method is used to link the zero-equalities generated during the mathematical derivation, which increases the freedom of selection of the constant connection matrix and may produce new time-delay cross-term information. Then, a less conservatism stability condition is established, and a robust H∞ controller is designed to ensure that the T–S fuzzy system achieves a predefined H∞ performance level. Finally, two examples are used to verify the feasibility and superiority of the obtained results. © 2024 The Franklin Institute

关键词： Membership functions

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：