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22nd IEEE International Conference on Industrial Informatics, INDIN 2024

作者： Chen, Weile Du, Haibo Li, Shihua School of Automation Southeast University Nanjing China School of Electrical Engineering and Automation Hefei University of Technology Hefei China

ISBN: (纸本)9798331527471

The stability of second-order non-smooth control system under denial-of-service (DoS) attack is studied in this paper. Non-smooth control method can be used to stabilize the system states to the equilibrium point in a finite time if there is no DoS attack. However, under DoS attack, the controller will maintain the latest received data, which may lead to local divergence of the system states. By designing a Lyapunov function, it is proven that under energy-constrained DoS attack, the states of closed-loop system can still converge to the equilibrium point in a finite time. The simulation results further validate the effectiveness of the theory. © 2024 IEEE.

关键词： Lyapunov functions

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Path-Following Control With Obstacle Avoidance of Autonomous Surface Vehicles Subject to Actuator Faults

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IEEE/CAA Journal of Automatica Sinica 2024年第4期11卷 956-964页

作者： Li-Ying Hao Gege Dong Tieshan Li Zhouhua Peng the School of Marine Electrical Engineering Dalian Maritime UniversityDalian 116026China the School of Automation Engineering University of Electronic Science and Technology of ChinaChengdu 611731the Navigation CollegeDalian Maritime UniversityDalian 116026 the Yangtze Delta Region Institute(Huzhou) Huzhou 313001China

This paper investigates the path-following control problem with obstacle avoidance of autonomous surface vehicles in the presence of actuator faults,uncertainty and external *** surface vehicles inevitably suffer from actuator faults in complex sea environments,which may cause existing obstacle avoidance strategies to *** reduce the influence of actuator faults,an improved artificial potential function is constructed by introducing the lower bound of actuator efficiency *** nonlinear state observer,which only depends on measurable position information of the autonomous surface vehicle,is used to address uncertainties and external *** using a backstepping technique and adaptive mechanism,a path-following control strategy with obstacle avoidance and fault tolerance is designed which can ensure that the tracking errors converge to a small neighborhood of *** with existing results,the proposed control strategy has the capability of obstacle avoidance and fault tolerance ***,the comparison results through simulations are given to verify the effectiveness of the proposed method.

关键词： Actuator faults autonomous surface vehicle(ASVs) improved artificial potential function nonlinear state observer obstacle avoidance

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A Two-layer Framework for Mitigating the Con-gestion of Urban Power Grids Based on Flexible Topology with Dynamic Thermal Rating

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Protection and Control of Modern Power Systems 2024年第4期9卷 83-95页

作者： Yi Su Jiashen Teh Qian Luo Kangmiao Tan Jiaying Yong the School of Automation and Electronic In-formation Xiangtan Universityxiangtan 411100China IEEE the School of Electrical and Electronic Engineering Universiti Sains Malaysia(USM)Penang 11800Malaysia the School of Computer Sciences Universiti Sains Malaysia(USM)Penang 11800Malaysia the Institute of Power Engineering College of EngineeringUniversiti Tenaga Nasional(UNITEN)Kajang 43000Malaysia

The urban power grid(UPG)combines transmission and distribution *** studies on UPG congestion mitigation have primarily focused on relieving local congestion while ignoring large-scale energy transfer with safety margins and load *** situation is expected to worsen with the proliferation of renewable energy and electric *** this paper,a two-layer congestion mitigation framework is proposed,one which considers the congestion of the UPG with flexible *** the upper-layer,the particle swarm optimization algorithm is employed to optimize the power supply distribution(PSD)of substation *** is known as the upper-layer *** lower-layer model recalculates the new PSD,known as the lower-layer PSD,based on the topology candidates.A candidate topology is at an optimum when the Euclidean distance mismatch between the upper-and lower-layer PSDs is the *** optimum topology is tested by standard power flow to ascertain its *** optimum transitioning sequence between the initial and optimum topologies is also determined by the two-layer framework to minimize voltage deviation and line overloading of the UPG considering dynamic thermal *** proposed framework is tested on a 56-node test *** show that the proposed framework can significantly reduce congestion,maintain safety margins,and determine the optimum transitioning sequence.

关键词： Congestion mitigation urban power grid two-layer framework transitioning sequence dynamic thermal rating

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Mechanical properties and thermal deformation behavior of low-cost titanium matrix composites prepared by a structure-optimized Y_(2)O_(3) crucible

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Journal of Iron and Steel Research International 2024年第3期31卷 738-751页

作者： Qian Dang Gang Huang Ye Wang Chi Zhang Guo-huai Liu Zhao-dong Wang The State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110819LiaoningChina School of Materials Science and Chemical Engineering Harbin University of Science and TechnologyHarbin 150004HeilongjiangChina School of Materials Science and Engineering Shenyang University of TechnologyShenyang 110870LiaoningChina

A porous yttrium oxide crucible with both thermal shock resistance and erosion resistance was developed by structural *** structure-optimized yttrium oxide crucible was proved to be suitable for melting highly reactive titanium ***-cost(TiB+Y2O_(3))-reinforced titanium matrix composites were prepared by vacuum induction melting using the prepared *** thermal deformation behavior and microstructure evolution of(TiB+Y2O_(3))-reinforced tita-nium matrix composites were investigated at deformation temperatures of 900-1100℃with strain rates of 0.001-1 *** results showed that the prepared yttrium oxide crucible had both thermal shock and erosion resistance,the low-cost titanium matrix composites could be prepared by the developed yttrium oxide crucibles which were homogeneous in composition and highly sensitive to strain rate and deformation temperature,and the peak and theological stresses decreased with increasing deformation temperature or decreasing strain *** addition,the average thermal deformation activation energy of the composites was calculated to be 574.6 kJ/mol by establishing the Arrhenius constitutive equation in consideration of the strain variables,and the fitting goodness between the predicted stress value and the measured value was 97.624%.The calculated analysis of the hot processing map showed that the best stable thermal deformation zone was located in the deformation temperature range of 1000-1100℃and strain rate range of 0.001-0.01 s^(-1),where the peak dissipation coefficient wasη=71%.In this zone,the deformation of the reinforcement and matrix was harmonious,the reinforcement was less likely to fracture,dynamic recrystallization occurred more fully and the alloy exhibited near steady rheological characteristics.

关键词： Yttrium oxide crucible Titanium matrix composite Thermal deformation behavior Constitutive equation Hot processing map Microstructure evolution

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Adaptive Phase-Shifted PWM Strategy With Common-Mode Voltage Reduction for T-Type Three-Level Inverters

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IEEE Transactions on Transportation Electrification 2025年第3期11卷 8450-8461页

作者： Zhang, Min Shen, Ke Zhao, Qi Cao, Yujia Yang, Yongxing Gao, Kaixuan Zhao, Dan Northwestern Polytechnical University School of Automation Xi’an710072 China Xi’an University of Technology Department of Electrical Engineering Xi’an710048 China

The T-type three-level inverters have enormous promise in medium-voltage drives for aircraft electric-propulsion applications. The phase-shifted carrier-based pulsewidth modulation (CBPWM) is a viable solution to reduce the damage caused by the common-mode voltage (CMV) of such inverters. However, the beneficial effect of triangular carrier phase shifting on CMV suppression has not been well explored, and it is still unknown what range of phase shift angles may guarantee CMV suppression for arbitrary modulation index. Therefore, aiming at the T-type three-level inverter, this study offers a thorough examination of the relationship between CMV reduction and the phase-shifted CBPWM approach. The characterization of the maximum CMV is revealed within the full modulation index range based on the sector segmentation and regular sampling. Then, an adaptive phase shift pulsewidth modulation (APS-PWM) strategy is developed to achieve consistent CMV reduction. The maximum CMV of the inverter may be efficiently eliminated under the proposed strategy by dynamic carrier phase shifting. Finally, experiments verify the correctness of the analysis and the feasibility of the proposed strategy. © 2015 IEEE.

关键词： Pulse width modulation

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Study on Serial Type Pump-Valve Compound Control Strategy 7

Study on Serial Type Pump-Valve Compound Control Strategy

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7th IEEE Advanced Information Technology, Electronic and automation Control Conference, IAEAC 2024

作者： Liu, Jian Wang, Zuoxun Zhang, Xiaochi Sun, Huilai School of Information and Automation Engineering Jinan China Shandong Technology and Business University School of Information and Electronic Engineering Yantai China School of Mechanical Engineering Jinan China

ISBN: (纸本)9798350339161

In response to the contradiction between the control accuracy and system efficiency in traditional electro-hydraulic servo systems, this paper proposes a series-connected pump-valve composite control system and investigates the corresponding control strategies. In terms of system positioning control, a positioning error-based switch control strategy is introduced. At the beginning of positioning, the pump control section dominates to reduce system energy consumption. When the positioning error decreases to the set value, it switches to the pump-valve coordinated control state to achieve precise positioning. For dynamic tracking control, a composite control strategy is proposed, where in the pump control section adopts feedforward compensation PI control, and the valve control section adopts PID control. Simulation results indicate that, in terms of positioning control, the switch control strategy based on positioning error can significantly improve the system response speed. In dynamic tracking control, the composite control strategy combining feedforward compensation PI control and PID control enables the system to possess the advantages of high system efficiency and high precision fast response. © 2024 IEEE.

关键词： Simulink

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Improved YOLOX Algorithm for Rapid Detection of Paper Diseases

Improved YOLOX Algorithm for Rapid Detection of Paper Diseas...

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2023 CAA Symposium on Fault Detection, Supervision and Safety for Technical Processes, SAFEPROCESS 2023

作者： Chen, Yumei Zhaofei, Li Hou, Jing Sichuan University of Science & Engineering School of Automation and Information Engineering Yibin China Sichuan University of Science & Engineering Dept. School of Automation and Information Engineering Yibin China

ISBN: (纸本)9798350337754

For the modern high-speed paper machine in the production process of small target paper disease characteristics of information is small, the proportion of low, part of the paper disease vulnerable to background noise and other problems, improved YOLOX paper disease fast detection algorithm is proposed. First, to address the problem of low speed of anchor frame-based paper disease detection algorithm, an improved YOLOX paper disease detection algorithm is proposed, through which the anchor-free frame structure is used to improve the speed of paper disease detection. Secondly, according to the problem that paper disease feature information such as creases and bright spots are lost due to background strip noise interference during image sampling, an attention mechanism CA is added to the YOLOX backbone feature network to enhance paper disease target localisation and paper disease global feature information extraction, and suppress strip noise interference. Finally, for the case of small hole paper disease easily missed detection, adding ASPP hole convolution in SPP can expand the perceptual field of the feature map without reducing the image resolution and improve the semantic information to improve the small target paper disease detection performance;adding CBAM in the feature fusion part to extract key and important features from both spatial and channel directions, so that the feature map of the network contains more key feature information The algorithm further improves the accuracy and stability of the model for small target paper disease detection and localization, and reduces the rate of missed detection. The algorithm is compared with the current target detection algorithm and the results show that the improved YOLOX paper surface defect detection algorithm has the best performance in terms of speed and accuracy, with mAP of 95.3% and FPS of 271 frames per second, and the algorithm can also complete efficient detection in low illumination conditions, which is t

关键词： Surface defects

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Distributed Leaderless Optimal Output Consensus of Heterogeneous Multi-Agent Systems

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Journal of Systems Science & Complexity 2025年第2期38卷 671-690页

作者： ZHANG Liping ZHANG Huanshui XIE Lihua College of Electrical Engineering and Automation Shandong University of Science and Technology School of Control Science and Engineering Shandong University School of Electrical and Electronic Engineering Nanyang Technological University

The distributed optimal output synchronization problem for the leaderless heterogeneous multi-agent system with a general global cost function is investigated for the first time by linear quadratic(LQ) optimal control theory. Conventional algorithms for heterogeneous systems are quite complex, requiring the design of a virtual reference generator and the solving of regulation *** paper presents a novel distributed asymptotically optimal controller by incorporating the design of distributed observer and feedforward controller. A general form of the distributed controller is obtained by solving an augmented algebraic Riccati equation, which is parallel to classical optimal control theory. The optimal topology is an arbitrary directed graph containing only a spanning tree. It is shown that the proposed algorithms outperform the traditional consensus methods in the convergence speed by selecting proper observer gain matrices, and eliminate the reliance on the nonzero eigenvalues of Laplacian matrix. Simulation example further demonstrates the effectiveness of the proposed scheme and a faster superlinear convergence speed than the existing algorithm.

关键词： Distributed feedforward control heterogeneous systems leaderless output consensus optimal control

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Reinforcement Learned Multiagent Cooperative Navigation in Hybrid Environment With Relational Graph Learning

IEEE Transactions on Artificial Intelligence

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IEEE Transactions on Artificial Intelligence 2025年第1期6卷 25-36页

作者： Ou, Wen Luo, Biao Xu, Xiaodong Feng, Yu Zhao, Yuqian Central South University School of Automation Changsha410083 China Zhejiang University of Technology Information engineering College Hangzhou310014 China

The multirobot cooperative navigation problem (MCNP) is an essential topic in multiagent control. This article proposes a distributed approach named GAR-CoNav to solve the navigation problem of multiagent to multiple destinations in the face of static and dynamic obstacles. Agents are expected to travel to different destinations without conflicting with each other to achieve maximum efficiency. That is, cooperative navigation in hybrid environment. The velocity obstacle encoding is combined with a graph to build a global representation, which helps the agent capture complex interactions in hybrid environment. GAR-CoNav processes and aggregates environmental features through the graph attention network and has scalability for the changing number of entities in the graph. A novel reward function is developed to train agents to achieve an actual cooperative navigation policy. Extensive simulation experiments demonstrate that GAR-CoNav achieves better performance than state-of-the-art methods. © 2024 IEEE.

关键词： Reinforcement learning

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Tailoring properties of directed energy deposited Al-Mg alloy by balancing laser shock peening and heat treatment

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Journal of Materials Science & Technology 2024年第36期203卷 78-96页

作者： Wei Dai Wei Guo Jun Xiao Ying Zhu Zewu Qi Jiaxin Shi Changhao Yin Dongsheng He Jiaxuan Chi Zhandong Wan Baoqiang Cong Minggao Li Hongqiang Zhang School of Mechanical Engineering and Automation Beihang UniversityBeijing100191China School of Materials Science and Engineering Beihang UniversityBeijing100191China Faculty of Materials and Manufacturing Beijing University of TechnologyBeijing100124China Technology Research Department CRRC InstituteBeijing100070China

Wire arc-directed energy deposition(WADED)has shown great advantages and potential in fabricating large-scale aluminum(Al)alloy ***,WADED Al alloys typically exhibit low strength and reliability due to pore defects and lack of work hardening or precipitation *** study utilized a combination of laser shock peening(LSP)and annealing to regulate the microstructure of WADED Al-Mg4.5Mn alloy and enhance mechanical *** effects of LSP and annealing on phase composition,pore distribution,and microstructures at multiple scales were systematically investigated to reveal the mechanical property improving *** results demonstrated that LSP-induced plastic deformation formed a defect-free zone by closing near-surface pore *** created the hardened layer with gradient mechanical properties by inducing gradient changes in grain size,the number of low-angle grain boundaries(LAGBs),and dislocation density along the depth *** annealing process promoted grain coarsening and reduced excessive dislocations and LAGBs,weakening the work harden-ing effect caused by ***,the high-density dislocations and high stored energy generated by LSP accelerated the recrystallization,facilitating growth of near-surface *** defect-free zone,dislocation strengthening,and LAGBs strengthening were responsible for the increase in strength,while the synergistic deformation between hardened layers and soft core facilitated maintaining excellent *** strength and elongation of WADED Al alloy can be synergistically improved by balancing the effects of LSP and heat treatment.

关键词： Wire arc-directed energy deposition Aluminum alloy Laser shock peening Pore distribution Tensile property

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