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Advances in 3D printing of magnetic materials:Fabrication,properties,and their applications

Journal of Advanced Ceramics 2022年第5期11卷 665-701页

作者： Xiangxia WEI Ming-Liang JIN Haiqiang YANG Xiao-Xiong WANG Yun-Ze LONG Zhangwei CHEN Institute for Future School of AutomationShandong Key Laboratory of Industrial Control TechnologyQingdao UniversityQingdao 266071China Collaborative Innovation Center for Nanomaterials&Devices College of PhysicsQingdao UniversityQingdao 266071China Additive Manufacturing Institute College of Mechatronics and Control EngineeringShenzhen UniversityShenzhen 518060China

Magnetic materials are of increasing importance for many essential applications due to their unique magnetic ***,due to the limited fabrication ability,magnetic materials are restricted by simple geometric ***-dimensional(3D)printing is a highly versatile technique that can be utilized for constructing magnetic *** shape flexibility of magnets unleashes opportunities for magnetic composites with reducing post-manufacturing costs,motivating the review on 3D printing of magnetic *** paper focuses on recent achievements of magnetic materials using 3D printing technologies,followed by the characterization of their magnetic properties,which are further enhanced by ***,the corresponding properties depend on the intrinsic nature of starting materials,3D printing processing parameters,and the optimized structural *** emphasis is placed on the functional applications of 3D-printed magnetic materials in different ***,the current challenges and future opportunities are also addressed.

关键词： three-dimensional(3D)printing hard magnets soft magnets magnetic properties applications

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Global-Local Adaptive Attention-Based U-Net for Single Image Deblurring

Global-Local Adaptive Attention-Based U-Net for Single Image...

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2024 China automation Congress, CAC 2024

作者： Yu, Xinran Li, Yueti Peng, Xuanzhi Wang, Chen Zou, An-Min College of Engineering Shantou University Shantou China School of Control Engineering Northeastern University at Qinhuangdao Qinhuangdao China State Key Laboratory of Multimodal Artificial Intelligence Systems Institute of Automation Chinese Academy of Sciences Beijing China

ISBN: (纸本)9798350368604

Image deblurring is a classical ill-posed problem aimed at recovering a clear image from a blurred one. The recent application of Transformers to image restoration tasks has significantly improved performance, thanks to their powerful long-range dependency modeling capabilities. However, the high computational cost of self-attention mechanisms limits their practical use. Additionally, the training cost for Transformer models is considerable. To address the issues of high computational cost and training cost, this paper proposes a novel Global Local Attention (GLA) mechanism that combines global and local adaptive attention. The mechanism uses 1D adaptive pooling operations to capture global context information, while fixed-size 1D pooling with different kernel sizes (7 and 11) is used to capture local details, effectively addressing both long-range dependencies and fine-grained information. Furthermore, a larger receptive field is crucial for effective image deblurring. To this end, we introduce a Feature Enhancement Module (FEM) with an expansive convolutional kernel size that serves as a bottleneck layer to further improve recovery quality. Experimental results demonstrate that our proposed model achieves competitive performance on several benchmark datasets, advancing the field of image restoration. © 2024 IEEE.

关键词： Restoration

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Stage-cost design for optimal and model predictive control of linear port-Hamiltonian systems: Energy efficiency and robustness

Stage-cost design for optimal and model predictive control o...

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93rd Annual Meeting of the International Association of Applied Mathematics and Mechanics, GAMM 2023

作者： Şen, Gökçen Devlet Schaller, Manuel Worthmann, Karl Optimization-based Control Group Institute of Mathematics Technische Universität Ilmenau Ilmenau Germany Department of Control and Automation Engineering Istanbul Technical University Istanbul Turkey

We consider singular optimal control of port-Hamiltonian systems with minimal energy supply. We investigate the robustness of different stage-cost designs w.r.t. time discretization and show that alternative formulations that are equivalent in continuous time, differ strongly in view of discretization. Furthermore, we consider the impact of additional quadratic control regularization and demonstrate that this leads to a considerable increase in energy consumption. Then, we extend our results to the tracking problem within model predictive control and show that the intrinsic but singular choice of the cost functional as the supplied energy leads to a substantial improvement of the closed-loop performance. © 2023 The Authors. Proceedings in Applied Mathematics & Mechanics published by Wiley-VCH GmbH.

关键词： Model predictive control

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A model reduction approach for discrete-time linear time-variant systems with delayed inputs

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Science China(Information Sciences) 2024年第4期67卷 197-217页

作者： Ai-Guo WU Guang-Ren DUAN Yu WANG Jie ZHANG School of Mechanical Engineering and Automation Harbin Institute of Technology(Shenzhen) HIT Wuhu Robot Technology Research Institute Center for Control Science and Technology Southern University of Science and Technology

A model reduction approach is presented for discrete-time linear time-variant input-delayed systems. According to this proposed approach, a dynamical variable is constructed by taking advantage of the current state and historical information of input. It is revealed that the behavior of this dynamical variable is governed by a discrete-time linear delay-free system. It is worth noting that the presented variable transformation does not require the system matrix to be invertible. Based on the reduced delay-free models,stabilizing control laws can be easily obtained for the original delayed system. For the case with a single input delay, the constructed variable is an exact prediction for the future state, and thus the stabilizing control law could be designed by replacing the future state with its prediction. Finally, three discrete-time periodic systems with delayed input are employed to illustrate how to utilize the presented model reduction approaches.

关键词： reduction approach predictor-based feedback time-varying systems delayed input periodic system

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A case study of virtual CNC machine tool assembly and human-computer interaction techniques 2

A case study of virtual CNC machine tool assembly and human-...

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2023 2nd International Conference on Mechanical, Aerospace Technology and Materials Application, MATMA 2023

作者： Zhang, Tianzhi Bing, Zhigang Chen, Biao Xu, Yu Ming, Rui School of Automation and Electrical Engineering Tianjin University of Technology and Education Tianjin Key Laboratory of Information Sensing & Intelligent Control Tianjin GongJiang Double Carbon Research Institute Tianjin300384 China

When it comes to the virtual machine tool assembly process, there are problems such as assembly errors. Based on the general idea of correct assembly, it is proposed to innovate the assembly process by utilizing the enclosing box and separating axis theorem and GJK algorithm, so as to monitor the state of the detection process, which verifies the effective feasibility of the monitoring method and provides a new idea for the assembly process of virtual CNC machine tools. © Published under licence by IOP Publishing Ltd.

关键词： Assembly

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Robust Consensus Tracking control of Uncertain Multi-Agent Systems With Local Disturbance Rejection

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IEEE/CAA Journal of Automatica Sinica 2023年第2期10卷 427-438页

作者： Pan Yu Kang-Zhi Liu Xudong Liu Xiaoli Li Min Wu Jinhua She the Faculty of Information Technology and the Beijing Institute of Artificial Intelligence Beijing University of TechnologyBeijing 100124China IEEE the Department of Electrical and Electronic Engineering Chiba UniversityChiba 263-8522Japan the Beijing Aerospace Automatic Control Institute Beijing 100854China the School of Automation China University of GeosciencesWuhan 430074China the School of Engineering Tokyo University of TechnologyHachiojiTokyo 192-0982Japan

In this paper,a new distributed consensus tracking protocol incorporating local disturbance rejection is devised for a multi-agent system with heterogeneous dynamic uncertainties and disturbances over a directed *** is of two-degree-of-freedom ***,a robust distributed controller is designed for consensus tracking,while a local disturbance estimator is designed for each agent without requiring the input channel information of *** condition for asymptotic disturbance rejection is ***,even when the disturbance model is not exactly known,the developed method also provides good disturbance-rejection ***,a robust stabilization condition with less conservativeness is derived for the whole multi-agent ***,a design algorithm is ***,comparisons with the conventional one-degree-of-freedombased distributed disturbance-rejection method for mismatched disturbances and the distributed extended-state observer for matched disturbances validate the developed method.

关键词： Directed graph distributed control disturbance rejection dynamic uncertainties multi-agent systems robust control

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Event-triggered Distributed Predictive Consensus control of Multi-agent Systems with Random Communication Constraints 42

Event-triggered Distributed Predictive Consensus Control of ...

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42nd Chinese control Conference, CCC 2023

作者： Jia, Zhiqiang Luo, Wencheng Lu, Pingli Du, Changkun Liu, Haikuo Beijing Aerospace Automatic Control Institute Beijing100039 China School of Automation Beijing Institute of Technology Beijing100081 China School of Mechatronical Engineering Beijing Institute of Technology Beijing100081 China

ISBN: (纸本)9789887581543

In this article, the consensus control issue of homogeneous multi-agent systems is studied. To reduce the negative effects brought out by random communication constraints, an event-triggered distributed predictive consensus control strategy is proposed. Within the proposed strategy, the event-triggered mechanism is designed to reduce the consumption of network resources. Additionally, the stability and consensus conditions of closed-loop MASs are formulated. Finally, the validity of the presented strategy is demonstrated by simulation results. © 2023 Technical Committee on control Theory, Chinese Association of automation.

关键词： Multi agent systems

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Grouping of the UAV Swarm Based on Automatic Fuzzy Clustering

Grouping of the UAV Swarm Based on Automatic Fuzzy Clusterin...

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International Conference on Guidance, Navigation and control, ICGNC 2022

作者： Liu, Zhiheng Zhou, Rui Chen, Jinyong Zhang, Ning School of Automation Science and Electrical Engineering Beihang University Beijing100083 China Science and Technology on Aircraft Control Laboratory AVIC Xi’an Flight Automatic Control Research Institute Xi’an710065 China

ISBN: (纸本)9789811966125

The confrontation between UAV swarms will be an important combat style in the future, and a reasonable division of such a target air fleet is instructive to the deployment of our own resources. In this paper, we combine the genetic fuzzy clustering and the cluster validation to achieve autonomous grouping of the UAV swarm. Firstly, the flight state parameters such as position, speed, and yaw angle are used as characteristic components to measure the differences among UAVs. Then, the proposed approach establishes a mathematical model for grouping of the UAV swarm by fuzzy C-means algorithm. In addition, we compare five advanced clustering validity indexes and a clustering validation method based on graph theory, from which an evaluation criterion more applicable to grouping of the UAV swarm is selected. Finally, numerical simulations are performed to verify that the proposed approach can divide the air fleet autonomously and rationally in complex task scenarios. © 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Unmanned aerial vehicles (UAV)

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Semi-Markov Telecommunication Networks Model

Semi-Markov Telecommunication Networks Model

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2024 International Conference on Actual Problems of Electron Devices engineering, APEDE 2024

作者： Svetlov, Mikhail S. L’vov, Alexey A. Martirosyan, Arman M. Martirosyan, David M. Bagaev, Igor S. Khasanov, Semen T. Laboratory of Control and Automation Problems in Mechanical Engineering Institute of Precision Mechanics and Control of RAS Saratov Russia Institute of Institute of Electronic Engineering and Instrumentation Yuri Gagarin State Technical University of Saratov Saratov Russia Institute of Applied Information Technologies and Communications Yuri Gagarin State Technical University of Saratov Saratov Russia Phystech-School of Applied Mathematics and Computer Science Moscow Institute of Physics and Technology Moscow Russia

ISBN: (纸本)9798350393316

This paper proposes a semi-Markov model of telecommunication network (TCN). The variant of dynamic traffic adaptive control of queuing system as a special case of TCN is considered. The main purpose of control is to minimize the average cost per unit of time to service the incoming flow of information (packets). This takes into account the different bandwidth of the channels, the processing speed of information in the channel and the information capacity of the buffers. The approach to the organization of dynamic control taking into account noise immunity (information reliability) and information security is discussed. © 2024 IEEE.

关键词： Bandwidth

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Wi-Fi Positioning Method Based on Convolutional Autoencoder and Device Heterogeneity Compensation 12th

Wi-Fi Positioning Method Based on Convolutional Autoencoder ...

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12th International Conference on Signal and Information Processing, Networking and Computers, ICSINC 2024

作者： Wang, WenFeng Zhang, Zhang Guo, Liangliang Feng, Meijuan Wang, Qu School of Automation Science and Electrical Engineering University of Science and Technology Beijing Beijing100083 China China Electronics Standardization Institute Beijing100007 China Department of Energy and Control Engineering Shanxi Information Industry Technology Research Institute Co. LTD Taiyuan030012 China

ISBN: (纸本)9789819649662

As location-based service technology continues to develop, people's demand for positioning technology is increasing. Satellite positioning technology can be widely used for positioning in outdoor environments. However, due to the weak penetration ability of satellite signals into buildings, the application of this technology in indoor environments faces many limitations. Therefore, there is an urgent need to conduct in-depth research on reliable indoor positioning technology. Among commonly used indoor positioning technologies, indoor positioning technology based on WLAN signals has the advantages of wide coverage, low deployment cost, easy installation, and non-line-of-sight propagation, so it shows excellent universality. This article proposes a Wi-Fi Positioning Method Based on convolutional autoencoder and device heterogeneity compensation. Compared with traditional Wi-Fi positioning methods such as SVM, the positioning accuracy has been greatly improved and can meet daily low-cost, high-precision indoor positioning needs. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2025.

关键词： Code division multiple access

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