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11th Frontier Academic Forum of Electrical engineering, FAFEE 2024

作者： Xu, Jiacheng Chen, Yandong Xie, Zhiwei Li, Xuyang Zhao, Chen National Electric Power Conversion and Control Engineering Technology Research Center Hunan University Changsha410082 China

ISBN: (纸本)9789819788194

In order to solve the problem that the traditional Grid-Following (GFL) grid-connected inverter is prone to oscillation and instability under weak grid, a grid-following virtual synchronous mechanism construction and voltage feedforward control method based on the swing equation of the synchronizer are proposed. Firstly, the method refers to the Virtual Synchronous Generators (VSG) technology to derive and reconstruct the swing equation of the synchronous machine, and proposes a new voltage feedforward controller, which introduces inertia and damping to the control of the GFL inverter and improves the stability of the GFL inverter under the weak power grid. Then, the proposed control method is theoretically analyzed and optimized by establishing the frequency-coupling sequence admittance model, and the results show that the proposed method can significantly improve the negative resistance characteristics of the inverter in the middle and low frequency bands to enhance the stability of the GFL grid-connected inverter under the weak grid. Finally, this paper verifies that the proposed control method can operate stably in weak and very weak grids, as well as in strong power grids, which is of great significance for improving the adaptability and reliability of GFL grid-connected inverters in complex grid conditions. © Beijing Paike Culture Commu. Co., Ltd. 2025.

关键词： Feedforward control

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Swarm-Based Dynamic Coverage of Multi-ASV Systems in the Presence of Measurement Noises

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IEEE Transactions on Vehicular Technology 2025年第5期74卷 7237-7250页

作者： Liu, Lu Jiao, Shijian Han, Bing Li, Tieshan Peng, Zhouhua Dalian Maritime University School of Marine Electrical Engineering Dalian116026 China Dalian Key Laboratory of Swarm Control and Electrical Technology for Intelligent Ships Dalian116026 China State Key Laboratory of Maritime Technology and Safety Dalian116026 China Shanghai Ship and Shipping Research Institute National Engineering Research Center of Ship & Shipping Control System Shanghai200135 China University of Electronic Science and Technology of China School of Automation Engineering Chengdu611731 China

This paper is concerned with the dynamic coverage of multiple autonomous surface vehicles (ASVs) in the presence of static and dynamic obstacles, limited communication distance, and measurement noises. A modular control method including planning, guidance, and control is proposed. At the planning level, a swarm-based dynamic coverage strategy is developed to achieve the coverage of a given domain. Both the collision avoidance and connectivity preservation issues are solved by using artificial potential fields. At the kinematic level, novel adaptive line-of-sight guidance laws are presented based on cascade extended state observers (CESOs), such that accurate guidance signals are given by compensating for time-varying sideslip angle and suppressing measurement noises. At the kinetic level, two CESOs are developed to estimate the internal model uncertainties and external environmental disturbance, and antidisturbance kinetic control laws are designed subsequently. The proposed CESOs overcome the noises sensitivity problem of classical observers, and thus facilitate the practical implementation under measurement noises. The input-to-state stability of the closed-loop system is confirmed by the Lyapunov theory and cascade stability theory. Simulation and hardware-in-the-loop experiment results are provided to demonstrate the effectiveness of the proposed swarm-based dynamic coverage method. © 1967-2012 IEEE.

关键词： Velocity measurement

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A New Active Sonar Detector Based on Beamformed Deep Neural Network

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IEEE Journal of Oceanic engineering 2025年第2期50卷 1370-1386页

作者： Peng, Cong Wang, Lei Gao, Juncheng Zhang, Shuhao Ji, Haoran National Electric Energy Transformation and Control Engineering Technology Research Center College of Electrical Engineering Hunan University Changsha410082 China School of Physics and Electronics Hunan Normal University Changsha410081 China

This article proposes a new active sonar detector based on a beamformed deep neural network (BDNN) in three steps. The process involves a preprocessing step, a deep neural network (DNN) application step, and a subsequent postprocessing step. In the preprocessing step, partial spectra are extracted from multiple directions through frequency-domain beamforming. These partial spectra from different directions serve as DNN input, yielding estimated target probabilities as output in the DNN application step. In the postprocessing step, a multiframe probability multiplication technique is proposed, and the number of frames is determined adaptively. The proposed BDNN generates a gridded azimuth-distance graph, where each grid cell represents the probability of a target's presence at a specific azimuth and distance. To guarantee real-time application, we also propose a graphics processing unit based parallel acceleration method, which increases the computation speed of the beamforming process by nearly two orders of magnitude compared to the CPU. The proposed BDNN is verified through sea and lake trials. The results demonstrate that the proposed BDNN achieves better detection performance compared to the conventional matched filter method and exhibits remarkable generalization capabilities. © 1976-2012 IEEE.

关键词： Frequency domain analysis

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Anti-Offset Wireless Power Transfer System Based on Variable Inductor 11th

Anti-Offset Wireless Power Transfer System Based on Variable...

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11th Frontier Academic Forum of Electrical engineering, FAFEE 2024

作者： Qu, Sizhuo Chen, Yandong Luo, Cong Xie, Jiawei Wu, Longbang National Electric Power Conversion and Control Engineering Technology Research Center Hunan University Changsha410082 China

ISBN: (纸本)9789819788194

In recent years, wireless power transfer has been widely studied for its advantages of safety, convenience and intelligence. However, in the actual working scene, the horizontal or vertical offset of the receiving coil may cause a large fluctuation in the output voltage of the system, which seriously affects the life of the load, and the surge of the primary side current leads to the heating of the switch and even the overcurrent of the device. Therefore, this paper proposes an anti-offset control strategy based on adjusting the variable inductor to compensate for the surge of the primary side current and the fluctuation of the output voltage caused by the coil offset. In this paper, a detuned series-series anti-offset wireless power transfer system with variable inductor added to the secondary side is designed. The variable inductor is adjusted by changing the permeability of the variable inductor. Based on the adjustment of the variable inductor, the output voltage is constant when the coil is offset and the primary side current is reduced. The control strategy does not require wireless communication. Finally, a 600 W wireless power transfer system with stable output voltage of 72 V is built. The experimental results show that the tolerance range of the system in the horizontal direction is 0–12 cm, and the tolerance range in the vertical direction is 5–11 cm, and the current of the transmitting coil is reduced when the coil is offset. The system improves the freedom and stability of the wireless power transfer system. © Beijing Paike Culture Commu. Co., Ltd. 2025.

关键词： Inductive power transmission

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Impulsive Consensus of MASs With Input Saturation and DoS Attacks

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IEEE/CAA Journal of Automatica Sinica 2025年第2期12卷 414-424页

作者： Xuyang Wang Dengxiu Yu Xiaodi Li the Unmanned System Research Institute Northwestern Polytechnical University IEEE the School of Artificial Intelligence Optics and Electronics Northwestern Polytechnical University the School of Mathematics and Statistics Shandong Normal University the Center for Control and Engineering Computation Shandong Normal University

This paper investigates the secure impulsive consensus of Lipschitz-type nonlinear multi-agent systems(MASs) with input saturation. According to the coupling of input saturation and denial of service(DoS) attacks, impulsive control for MASs becomes extremely challenging. Considering general DoS attacks,this paper provides the sufficient conditions for the almost sure consensus of the MASs with input saturation, where the error system can achieve almost sure local exponential *** linear matrix inequalities(LMIs), the relation between the trajectory boundary and DoS attacks is characterized, and the trajectory boundary is estimated. Furthermore, an optimization method of the domain of attraction is proposed to maximize the size. And a non-conservative and practical boundary is proposed to characterize the effect of DoS attacks on MASs. Finally, considering a multi-agent system with typical Chua's circuit dynamic model, an example is provided to illustrate the theorems' correctness.

关键词： Almost sure consensus denial of service (DoS) attacks impulsive control input saturation

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Application of phononic crystals in modern engineering vibration and noise control, a review

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Noise and Vibration Worldwide 2025年第4-5期56卷 224-241页

作者： Huang, Wei Xu, Jian Yao, Yi Zhang, Yongliang Wang, Xin Han, Pengbo SINOMACH Academy of Science and Technology Co. Ltd SINOMACH Research Center of Engineering Vibration Control Technology Beijing100080 China Beijing China CAS Key Laboratory of Mechanical Behavior and Design of Materials Department of Modern Mechanics University of Science and Technology of China Anhui China Key Laboratory of Vibration Control for Key Process Equipment of Major Scientific Infrastructure in the Machinery Industry Beijing China

Phononic crystals are composite materials consisting of periodically distributed inclusions, and this structure enables wave band gaps under specific conditions. This characteristic allows for the suppression of elastic waves within certain frequency ranges, offering a new approach to vibration reduction and noise control. In this study, phononic crystals, with their periodic structure, tunable bandgap properties, topology optimization, and additive manufacturing technology, are reviewed. Some key hot issues, such as low-frequency vibration and noise control, intelligent materials, and tunable bandgap design, are discussed. In the future, phononic crystals will play a significant role in barrier vibration isolation, rail transit vibration isolation, power equipment vibration isolation, precision equipment vibration isolation, noise control, and underground protection engineering. This study constitutes a systematic summary and outlook of phononic crystals in modern engineering vibration and noise control. © The Author(s) 2025.

关键词： Precision engineering

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Effects of forest age and bedrock on soil phytolith-occluded organic carbon accumulation of large-diameter bamboo forests in southwest China

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Soil Ecology Letters 2025年第1期7卷 105-119页

作者： Lukang Song Li Liu Linjiao Wang Maoyin Sheng Institute of Karst Research Guizhou Normal UniversityGuiyang 550001China National Engineering Research Center for Karst Rocky Desertification Control Guizhou Normal UniversityGuiyang 550001China

To understand the sequestration characteristics and mechanisms of soil PhytOC(phytolith-occluded organic carbon)in large-diameter bamboo forests,the soil PhytOC accumulation of the *** forests and *** forests in the karst and non-karst zones of southwest China were studied by the methods of field sampling,laboratory measurement,and statistic *** study yielded the following results and conclusions:1)The PhytOC content and storage in the 0‒30 cm soil profile of the *** forests range from 0.16‒1.85 g kg^(‒1)and 0.14‒1.41 t hm^(‒2),***,the PhytOC content and storage in the 0‒30 cm soil profile of the *** forests vary between 0.56‒2.44 g kg^(‒1)and 0.49‒2.07 t hm^(‒2),respectively.2)Stand age and bedrock type significantly influence the accumulation of soil PhytOC in both *** forests and *** *** mature forests exhibit the highest soil PhytOC content and storage in both types of bamboo ***,the soil PhytOC content in karst bamboo forests is notably higher compared to that in the non-karst area.3)Soil available Si is identified as one of the critical factors affecting the soil PhytOC accumulation in bamboo *** of the present study are of great significance for estimating the phytolith carbon sequestration capacity of bamboo forests and for bamboo forest construction and management aimed at enhancing carbon sequestration.

关键词： phytolith PhytOC bamboo forest Phyllostachys edulis Bambusa emeiensis

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DISTANCE BETWEEN SPECIES BY CONFUSION OPERATORS OF MULTI-CLASS CLASSIFIERS

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UPB Scientific Bulletin, Series A: Applied Mathematics and Physics 2025年第1期2025卷 171-182页

作者： Tarbă, Nicolae Irimescu, Ionela N. Pleavă, Ana M. Scarlat, Eugen N. Mihăilescu, Mona Doctoral School Computer Science and Engineering Department Faculty of Automatic Control and Computers National University of Science and Technology POLITEHNICA Bucharest Romania Applied Sciences Doctoral School National University of Science and Technology POLITEHNICA Bucharest Romania CAMPUS Research Center National University of Science and Technology POLITEHNICA Bucharest Romania Physics Dept National University of Science and Technology POLITEHNICA Bucharest Romania Physics Dept Research Center for Applied Sciences in Engineering National University of Science and Technology POLITEHNICA Bucharest Romania

We introduce a method to evaluate the similarities between classes of objects based on the confusion matrices coming from the multi-class machine learning (ML) predictors that operate in the vector space generated by the classes. Operation in the confusion domain allows us to use the distance as evaluation metric of the closeness of the relevant properties carried by the classes. We applied the method to semiquantitatively evaluate the effects of X-ray and carbon ion radiation on cultured SW1353 chondrosarcoma cells with respect to the non-irradiated reference. We prove that it is possible to draw useful information on the strength of cells nuclei changes. © 2025, Politechnica University of Bucharest. All rights reserved.

关键词： Radiation effects

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Characterizing molecular fingerprint of dissolved organic matter shaped by natural and anthropogenic factors in a large macrophytic shallow lake wetland

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Frontiers of Environmental science & engineering 2025年第3期19卷 73-86页

作者： Shengwu Yuan Yiping Xu Pengfei Wang Ruili Xie Jiangbo Hu Zhenghui Fu Kun Wang Shuhang Wang Xia Jiang Kaifeng Rao Mei Ma Zijian Wang State Key Laboratory of Environmental Criteria and Risk Assessment National Engineering Laboratory for Lake Pollution Control and Ecological RestorationState Environment Protection Key Laboratory for Lake Pollution ControlState Environmental Protection Key Laboratory of Drinking Water Source ProtectionChinese Research Academy of Environmental ScienceBeijing 100012China Research Center for Eco-Environmental Sciences Chinese Academy of SciencesBeijing 100085China College of Resources and Environment University of Chinese Academy of SciencesBeijing 100049China

Dissolved organic matter(DOM)participates in and affects many biological processes in aquatic ecosystems,altering nutrient cycling,bioavailability and toxicity of *** water contains thousands of DOM molecules,which largely originate from natural sources and are greatly influenced by external inputs through anthropogenic *** elucidate the shaping mechanism of the DOM composition under complex habitat conditions and anthropogenic disturbances,the characteristic molecular fingerprint of DOM was determined based on chemodiversity information obtained via ultrahigh-resolution mass spectrometry for the Baiyangdian wetland(a typical large macrophytic shallow lake in North China).In the Baiyangdian wetland,the DOM composition exhibited high complexity and spatial heterogeneity,and more recalcitrant DOM molecules were identified in summer than in *** multiple natural factors(nutrient concentration,depth of water and quality of submerged macrophytes)and anthropogenic factors(different land uses and discharge of pollutants)were associated with the relative abundance of various DOM molecules,only the influences from the anthropogenic factors were statistically *** alpha diversity index of DOM could reflect variations in both the natural factors(total dissolved phosphorus)and the anthropogenic factors(discharge of nitrogen and phosphorus).Furthermore,the DOM composition in each group were clustered according to the ecological functions(natural reserves,tourism,breeding,and domestic supply functions),and exhibited molecular fingerprint *** study provides an effective approach to characterize the molecular fingerprint features of DOM and critical information to better understand the shaping mechanism of the DOM composition under complex habitat conditions and anthropogenic disturbances.

关键词： DOM FT-ICR-MS Chemodiversity Habitat Ecological function Baiyangdian wetland

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Intelligent equalizing pressure ventilation system for coal mine: A case study of the 104 coal mining face in Shige Tai Mine

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Energy Reports 2025年 13卷 4998-5005页

作者： Geng, Feng Li, Wei Liu, Yanqing Peng, Ran Li, Zongxiang Liu, Hanwu Intelligent Control Technology Co. Ltd. Beijing100013 China Mine Intelligent Ventilation Division China Coal Research Institute Beijing100013 China Beijing Engineering and Research Center of Mine Safe Beijing100013 China National Key Laboratory of Intelligent Coal Mining and Rock Strata Control Beijing100013 China Safety Science and Engineering College Liaoning Technical University Liaoning 123000 China Beijing100083 China

This study investigates the application of an intelligent equalizing pressure ventilation system in the 104 coal mining face of the Shige Tai Mine. The relationship between the balanced pressure window opening area and the face air volume, as well as the equalizing pressure, was analyzed. A formula for calculating the local resistance of the balanced pressure window was derived. The combined regulation of the equalizing pressure local fan and the balanced pressure window was used to develop an intelligent equalizing pressure ventilation system, which can remotely and intelligently regulate the equalizing pressure of the mining face. The results show that the local wind resistance of the balanced pressure window is negatively exponentially related to its ventilation area, and the ventilation resistance of the working face is positively correlated with the air supply volume. After the combined equalizing pressure regulation, the volume fractions of CO2 and CO were significantly reduced, meeting the required air volume of the working face and achieving the expected effect of equalizing pressure ventilation. This study provides theoretical references for the intelligent equalizing pressure ventilation in coal mine mining faces. © 2025 The Authors

关键词： Coal mines

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