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2022 IEEE International Conference on Real-Time Computing and Robotics, RCAR 2022

作者： Li, Gang Ma, Xin Li, Zhi Li, Yibin Shandong University Center of Robotics School of Control Science and Engineering Jinan250061 China

ISBN: (数字)9781665469838

ISBN: (纸本)9781665469838

Rotary cranes usually transfer the heavy mass and large payloads with distributed mass beam in practice. As a typical underactuated system, the dynamic model is very complicated and challenging due to the actuated boom luffing motion and underactuated distributed mass beam payload swing vibration. To simplify the dynamic model, the existing control method regards the payload as the mass point, which ignores the geometry of the payload. This paper proposes an energy shaping based nonlinear anti-swing controller for double-pendulum rotary crane with distributed-mass beams. The rotary crane dynamic model is established based on the Lagrange's method. After analysis the energy function, a nonlinear anti-swing controller is designed for the rotary crane. It successfully solves the boom positioning and payload anti-swing problems with a distributed mass beam payload. LaSalle's invariance theorem and Lyapunov technology are helped to analysis the stability of the rotary crane control system. Finally, the proposed controller shows effective and robust control performance in the simulation verification. © 2022 IEEE.

关键词： controllers

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EXPERIMENTAL ANALYSIS OF OBTAINING BIOGAS FROM WASTEWATER TREATMENT PLANT SLUDGE

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UPB Scientific Bulletin, Series B: Chemistry and Materials science 2024年第4期86卷 145-154页

作者： Măcinic, Magdalena-Elena Boncescu, Corina Şerban, Dana Andreya Robescu, Lăcrămioara Diana Lăcureanu, Andra-Maria Dept. of Hydraulic Machinery & Environmental Eng National University of Science & Technology POLITEHNICA Bucharest Romania Dept. of The Center for Advanced Research on New Materials Products and Innovative Processes/CAMPUS Laboratory for Analysis Control and Remediation of Contaminated Sites National University of Science and Technology POLITEHNICA Bucharest Romania

This article presents the results regarding experimental research activities of obtaining biogas from wastewater treatment plants sludge. In this research, three experiments have been done, in which the temperature varied between 34-50oC to analyze both the mesophilic and thermophilic regime. The scope was obtaining methane and hydrogen from the sludge collected from WWTP on the Romanian coast. The maximum methane value was 2.8%, for the temperature of 35oC. The hydrogen was obtained in high quantities only in the thermophilic regime at temperatures close to 50°C. © 2024, Politechnica University of Bucharest. All rights reserved.

关键词： Wastewater treatment

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Tuning SMSI to stabilize metallic Pd species:A case study on Pd/TiO_(2) for HCHO oxidation

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Chinese Chemical Letters 2024年第3期35卷 162-166页

作者： Chunying Wang Xiaofeng Liu Jingyi Wang Yaobin Li Shaohua Xie Fudong Liu Changbin Zhang Yuming Zheng Wenpo Shan Hong He Center for Excellence in Regional Atmospheric Environment Key Laboratory of Urban Pollutant ConversionInstitute of Urban EnvironmentChinese Academy of SciencesXiamen 361021China Zhejiang Key Laboratory of Urban Environmental Processes and Pollution Control Ningbo Urban Environment Observation and Research StationChinese Academy of SciencesNingbo 315800China Department of Civil Environmentaland Construction Engineering(CECE)Catalysis Cluster for Renewable Energy and Chemical Transformations(REACT)Nano Science Technology Center(NSTC)University of Central FloridaOrlandoFL 32816USA State Key Joint Laboratory of Environment Simulation and Pollution Control Research Center for Eco-environmental SciencesChinese Academy of SciencesBeijing 100085China

Pretreatment of the carrier for supported catalysts can effectively improve the strong metal-support interaction(SMSI)and increase the dispersion of precious metals,which are critical to many important catalytic *** this work,we tuned SMSI on Pd/TiO_(2)catalysts through inducing surface defects of TiO_(2)by pretreated with different atmospheres(H_(2)/N_(2),N_(2),O_(2)/N_(2))at the high temperature(800℃).Multiple characterization results illustrated that surface defects anchored Pd species and thus enhanced their *** reduction,Ti^(3+)species formed and transferred onto the metallic Pd species and then induced SMSI,which effectively stabilize Pd species in the metallic *** stronger MSI,the more stability of Pd *** a case,Pd/TiO_(2)–800H_(2),with strongest MSI,displayed the best HCHO oxidation performance at low temperature(10℃).

关键词： Pd/TiO_(2) Surface defects SMSI Formaldehyde Stability of Pd species

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Water-soluble chitosan promotes remediation of Pb-contaminated soil by Hylotelephium spectabile

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Frontiers of Environmental science & engineering 2024年第7期18卷 109-122页

作者： Bingxin Guo Yiwei Zhang Junxing Yang Tianwei Qian Junmei Guo Xiaona Liu Yuan Jiao Tongbin Chen Guodi Zheng Wenjun Li Fei Qi College of Environmental Science and Engineering Taiyuan University of TechnologyShanxi Key Laboratory of Earth Surface Processes and Resource Ecological Security in Fenhe River BasinShanxi Engineering Research Center of Low Carbon Remediation for Water and Soil Pollution in Yellow River BasinJinzhong 030600China Center for Environmental Remediation Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China University of Chinese Academy of Sciences Beijing 100049China Shanxi Transportation Holding Ecological Environment Co. Ltd.Shanxi 030000China Beijing Key Lab for Source Control Technology of Water Pollution College of Environmental Science and EngineeringBeijing Forestry UniversityBeijing 100083China

Water-soluble chitosan(WSC)has been studied for its ability to mobilize soil Pb and promote the phytoremediation by Hylotelephium spectabile in Pb-contaminated *** aimed to clarify the internal mechanism by which wSC impacts phytoremediation by examining plant growth and Pb accumulation performance of *** as well as the Pb form,functional groups,and mineral phases of Pb-contaminated *** effectively decreased soil pH and activated Pb migration in rhizosphere soils,with a considerable increase in water-soluble and acid-extractable Pb by 29%-102%and 9%-65%,respectively,and a clear decreasing trend in reducible and oxidizable ***-transform infrared spectroscopy revealed a significant increase in amino and hydroxyl groups in the soil generated by *** coordination of Pb with amino and hydroxyl groups may play an important role in the formation of Pb complexes and activation of Pb in *** field trials,the application of WSC significantly increased Pb accumulation in *** by 125.44%,reaching 92 g/hm^(2).Moreover,the organic matter and nitrogen in the soils were increased by WSc,which improved the growth conditions of *** obvious growth inhibition was observed in either the pot or field ***,WSC is a promising chelating agent for mobilizing Pb in ***,WSC can be potentially used to boost ***-mediated phytoremediation of Pb-contaminatedfarmland.

关键词： Phytoremediation Pb-contaminated soil Water-soluble chitosan Hylotelephium spectabile Fourier transform infrared spectroscopy

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OPS-YOLO: A Lightweight Foreign Objectors Detection Model for Overhead Power System 43

OPS-YOLO: A Lightweight Foreign Objectors Detection Model fo...

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43rd Chinese control Conference, CCC 2024

作者： Liu, Boning Shi, Rui Deng, Heng Zhang, Liguo Beijing University of Technology Faculty of Information Technology Beijing100124 China Engineering Research Center of Intelligence Perception and Autonomous Control Ministry of Education Beijing100124 China

ISBN: (纸本)9789887581581

The performance of modern railway transit systems heavily relies on the overhead power system (OPS). However, OPSs built on the ground are vulnerable to foreign objects that can pose a threat to railway safety. In this paper, an improved lightweight detection method called OPS-YOLO, which is based on YOLO-v5, is proposed to detect foreign objects in OPSs. First, the Ghostnet-v2 is improved to compress the lightweight backbone model to slim down the original YOLO-v5 and reduce the complexity and computation. Then, a parameter-free attention mechanism SimAM is introduced to enhance the detection precision of OPS-YOLO. Furthermore, the Focal-EIoU is chosen as the loss function of the OPS-YOLO to improve object border localization precision while accelerating bounding box regression speed. To evaluate the performance of OPS-YOLO, we generate a customized dataset of OPS scenarios by using augmentation methods to expand the existing samples and improve training results. Finally, we extensive experimental tests on the dataset are conducted to verify the proposed method. Results show that the proposed OPS-YOLO improves the mAP by 0.5% compared to the classical YOLO-v5s network. Additionally, OPS-YOLO compresses the model parameters by 37.9% and reduces the model size by 37.5%. It is demonstrated that OPSYOLO can achieve a balance between computational efficiency and detection accuracy, making it suitable for automating OPS supervision and reducing reliance on human inspection. © 2024 Technical Committee on control Theory, Chinese Association of Automation.

关键词： Convolutional neural networks

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Extraction and identifcation of spectrum characteristics of coal and rock hydraulic fracturing and uniaxial compression signals

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International Journal of Coal science & Technology 2023年第4期10卷 1-16页

作者： Ya′nan Qian Quangui Li Qianting Hu Zhizhong Jiang Ronghui Liu Jie Li Wenxi Li Changjun Yu State Key Laboratory of Coal Mine Disaster Dynamics and Control Chongqing UniversityChongqing 400044China School of Resources and Safety Engineering Chongqing UniversityChongqing 400044China State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines(Anhui University of Science and Technology) Huainan 232001China Mining College of Guizhou University Guiyang 550025GuizhouChina China Coal Technology and Engineering Group Shenyang Research Institute Fushun 113122China

Microseismic(MS)events generated during coal and rock hydraulic fracturing(HF)include wet events caused by fracturing fuid injection,in addition to dry events caused by stress *** mixture of these two events makes efective fracturing MS events pickup *** study is based on physical experiments of diferent coal and rock HF and uniaxial *** diferences of waveform characteristic parameters of various coal and rock ruptures were analyzed using the Hilbert–Huang transform,leading to some useful *** phase characteristics of the acoustic emission(AE)energy difered signifcantly and responded well to the pumping pressure *** AE waveforms of HF exhibit similar energy and frequency distribution characteristics after Empirical mode *** main frequency bands for coal,sandstone,and shale samples are 100–300 kHz,while the mudstone sample is in the range of 50–150 *** decay ratios for coal,sandstone,shale and mudstone samples are 0.78,0.83,0.67 and 0.85,*** compared to the uniaxial compression test,the main frequency bands of HF were reduced for coal,sandstone and mudstone samples,whereas shale remained essentially *** duration,instantaneous energy,and total energy of the HF waveform are smaller than those of uniaxial compression,while the decay ratio is greater,especially for the mudstone *** waveform characteristic parameters,trained using the multilayer perceptron neural network,can efectively identify HF and uniaxial compression events with an accuracy of 96%.

关键词： Hydraulic fracturing Uniaxial compression Hilbert-Huang transform Acoustic emission Microseismic

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Resilient Event-Triggered control of Connected Automated Vehicles Under Cyber Attacks

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IEEE/CAA Journal of Automatica Sinica 2023年第12期10卷 2300-2302页

作者： Ning Zhao Xudong Zhao Ning Xu Liang Zhang the College of Control Science and Engineering Bohai UniversityJinzhou 121013China the Institute of Ocean Research Bohai UniversityJinzhou 121013China the Faculty of Electronic Information and Electrical Engineering Dalian University of TechnologyDalian 116024China the College of Information Science and Technology Bohai UniversityJinzhou 121013China

Dear Editor,This letter contributes to designing a resilient event-triggered controller for connected automated vehicles under cyber attacks,including denial-of-service(DoS)and deception *** characterize the effect of... 详细信息

关键词： DoS service automated

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An Improved Distance Protection Method For Positive Sequence Voltage Polarization Based On Offset Angle 4

An Improved Distance Protection Method For Positive Sequence...

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4th International Conference on Energy, Power and Electrical engineering, EPEE 2024

作者： Feng, Teng Han, Liu Hu, Changbin Jing, Liuming State Grid Economic and Technological Research Institute Co. Ltd. Automation and Control Design Research Center Beijing China North China University of Technology Beijing Power Electronics and Electrical Drives Engineering Research Center Beijing China

ISBN: (纸本)9798331518066

Power electronic converters are used at both ends of 220 kV alternating current (AC) lines in offshore wind farms, and their fault characteristics are greatly affected by the converters, and there is a risk of incorrect action when traditional distance protection is applied to AC lines of flexible direct current (DC) delivery systems. To address this problem, the low voltage ride-through control strategy of the grid-side converter is introduced, and its influence on the action characteristics of distance protection based on positive sequence voltage polarization is analyzed. On this basis, an improved distance protection method is proposed to adjust the distance protection action range by using the offset angle to ensure the correct action of the distance protection, and the effectiveness of the proposed method is verified by the PSCAD/EMTDC simulation test results. © 2024 IEEE.

关键词： Offshore wind farms

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A Hybrid Algorithm for a Flexible Resource-constrained Multi-project Assembly Scheduling

A Hybrid Algorithm for a Flexible Resource-constrained Multi...

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2023 International Conference on Automation in Manufacturing, Transportation and Logistics, iCaMaL 2023

作者： Hao, Haiqiang Shen, Liezheng Zhen, Guohui Zhu, Haiping School of Mechanical Science & Engineering Huazhong University of Science and Technology Wuhan China National Center of Technology Innovation for Intelligent Design and Numerical Control Wuhan China

ISBN: (纸本)9781839539954

Project scheduling is essential for enhancing project execution efficiency and success rates through effective time and resource management. This study investigates a manufacturing process involving multiple products, framing it as a multi-project assembly scheduling problem with flexible resources. The primary objective is to minimize both project completion time and average flow time by optimizing project sequences and resource allocation. To achieve this, we develop a comprehensive activity sequence by integrating individual project sequences using two heuristics. A mathematical model is formulated to address these objectives, and an iterative hybrid NSGA-II with Tabu search (HNSGATS) is introduced to enhance decision-making variables. In this algorithm, resources are assigned to available activities upon their completion, with the resource exhibiting the highest availability selected as a substitute to expedite the initiation of subsequent activities. Each iteration explores various neighbourhood structures for project sequences and substitute resources, aiming to identify improved solutions. Comparative experiments demonstrate that the proposed method outperforms existing approaches in achieving optimal results. © The Institution of engineering & Technology 2023.

关键词： Scheduling algorithms

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Pressure stimulated current in progressive failure process of combined coal-rock under uniaxial compression:Response and mechanism

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International Journal of Mining science and Technology 2024年第2期34卷 227-243页

作者： Tiancheng Shan Zhonghui Li Xin Zhang Haishan Jia Xiaoran Wang Enyuan Wang Yue Niu Dong Chen Weichen Sun Dongming Wang State Key Laboratory of Coal Mine Disaster Prevention and Control China University of Mining and TechnologyXuzhou 221116China National Engineering Research Center for Coal Gas Control China University of Mining and TechnologyXuzhou 221116China School of Safety Engineering China University of Mining and TechnologyXuzhou 221116China State Key Laboratory for Fine Exploration and Intelligent Development of Coal Resources China University of Mining and TechnologyXuzhou 221116China State Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering China University of Mining and TechnologyXuzhou 221116China

Effective monitoring of the structural health of combined coal-rock under complex geological conditions by pressure stimulated currents(PSCs)has great potential for the understanding of dynamic disasters in underground *** reveal the effect of this way,the uniaxial compression experiments with PSC monitoring were conducted on three types of coal-rock combination samples with different strength *** mechanism explanation of PSCs are investigated by resistivity test,atomic force microscopy(AFM)and computed tomography(CT)methods,and a PSC flow model based on progressive failure process is *** influence of strength combinations on PSCs in the progressive failure process are *** results show the PSC responses between rock part,coal part and the two components are different,which are affected by multi-scale fracture characteristics and electrical *** the rock strength decreases,the progressive failure process changes obviously with the influence range of interface constraint effect decreasing,resulting in the different responses of PSC strength and direction in different parts to fracture *** PSC flow model is initially validated by the relationship between the accumulated charges of different *** results are expected to provide a new reference and method for mining design and roadway quality assessment.

关键词： Combined coal-rock Pressure stimulated current Progressive failure process Mechanism Flow model

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