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14th International Conference on Vibration Problems, ICOVP 2019

作者： Ma, Yanhong Liu, Shanshan Wang, Hong Hong, Jie School of Energy and Power Engineering Beihang University Beijing100083 China Collaborative Innovation Center of Advanced Aero-Engine Beijing100083 China Beijing Key Laboratory of Long-Life Technology of Precision Rotation and Transmission Mechanism Beijing Institute of Control Engineering Beijing100094 China

ISBN: (纸本)9789811580482

The momentum wheel is a critical component of high-precision stable platform of the spacecraft. During theworking process, with the continuous improvement of satellite performances such as attitude stability and imaging precision, the influence of micro-vibration on the control accuracy of the momentum wheel becomes increasingly prominent. In order to improve the attitude control accuracy of the spacecraft, it is necessary to suppress the disturbance force (moment) from momentum wheel. Based on the structural and mechanical characteristics of the components, the rotational excitation dynamical model of the momentum wheel is established, and the vibration sources of micro-vibrations are obtained. Hereby a finite element model of the momentum wheel with structural and excitation characteristicswill also be established. Combined with the test ofmodal vibration characteristics and the waterfall diagram of the ascent, the results show that the non-uniform and non-continuity of wheel body is the main reason for the low-order travelingwave vibration of the momentum wheel during operation;the asymmetry of the strut structure and the bearing support structure leads to the harmonic excitation vibration. © Springer Nature Singapore Pte Ltd. 2021.

关键词： Harmonic-wave excitation Micro-vibration Momentum wheel Non-uniformity Traveling wave vibration

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Space Domain Based Cooperative and Adaptive Cruise control for Enhanced Fuel Efficiency on Rolling Terrain

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SSRN 2024年

作者： Lei, Mingyue Wang, Haoran Li, Duo Li, Zhenning Dhamaniya, Ashish Hu, Jia Key Laboratory of Road and Traffic Engineering of the Ministry of Education Tongji University 4800 Cao’an Road Shanghai China Department of Civil and Environmental Engineering University of California Los AngelesCA90024 United States State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body Hunan University Changsha410082 China Department of Civil and Geospatial Engineering Newcastle University Newcastle upon TyneNE1 7RU United Kingdom State Key Laboratory of Internet of Things for Smart City Departments of Civil and Environmental Engineering and Computer and Information Science University of Macau Avenida da Universidade Taipa China Transportation Engineering & Planning Section Department of Civil Engineering Sardar Vallabhbhai National Institute of Technology Gujarat Surat395007 India Key Laboratory of Road and Traffic Engineering of the Ministry of Education Institute for Advanced Study Tongji University 4800 Cao’an Road Shanghai China

Ecological Cooperative and Adaptive Cruise control (Eco-CACC) is widely focused to enhance sustainability of CACC. However, state-of-the-art Eco-CACC studies are still facing challenges in adopting on rolling terrain. Furthermore, they cannot ensure both ecology optimality and computational efficiency. Hence, this paper proposes a nonlinear optimal control based Eco-CACC controller. It has the following features: i) enhancing performance across rolling terrains by modeling in space domain;ii) enhancing fuel efficiency via globally optimizing all vehicle's fuel consumptions;iii) ensuring computational efficiency by developing a differential dynamic programming-based solving method for the non-linear optimal control problem;iv) ensuring string stability through theoretically proving and experimentally validating. The performance of the proposed Eco-CACC controller was evaluated. Results showed that the proposed Eco-CACC controller can improve average fuel saving by 37.67% at collector road and about 17.30% at major arterial. © 2024, The Authors. All rights reserved.

关键词： Dynamic programming

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Effect of heat treatment on microstructure and mechanical properties of alsi10mg alloy fabricated by selective laser melting 21st

Effect of heat treatment on microstructure and mechanical pr...

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21st Chinese Materials Conference, CMC 2020

作者： Qi, Peng Li, Bolong Wang, Tongbo Zhou, Lian Nie, Zuoren Faculty of Materials and Manufacturing Key Laboratory of Advanced Functional Materials Education Ministry of China Beijing University of Technology Beijing100124 China China Aluminum Material Application Research Institute Aluminum Corporation of China Limited Beijing102209 China Northwest Institute for Nonferrous Metal Research Xi'an710016 China

ISBN: (纸本)9783035717389

The effects of the heat treatment process parameters on the microstructure and mechanical properties of a selective laser melted (SLMed) AlSi10Mg alloy were systematically investigated. The SLMed AlSi10Mg alloy was treated with T1 (180°C× 4h + air cooling) process, which had the microstructure of fine α-Al grains, fine Si phase, and nano-sized precipitations. The microhardness significantly increased to 150 HV, which is even higher than as-SLMed one (126 HV). The microhardness of SLMed AlSi10Mg alloy treated with T4 (540°C × 2h + water cooling) heat-treatment process significantly decreased to 62 HV due to the growth of α-Al grains, Si phase and the formation of β-AlFeSi phase. However, the microhardness and ultimate tensile strength of AlSi10Mg alloy treated with T6 (540°C × 2 h water cool + 180°C × 4 h air cool) process decreased to 91 HV, although the strengthening precipitation of Mg2Si phase formed. It indicates that the Mg2Si phase cannot compensate for the adverse effect of grain growth. It may provide the best potential heat treatment method for fabricating the high strength SLMed AlSi10Mg alloy. © 2021 Trans Tech Publications Ltd, Switzerland.

关键词： Microstructure

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Rg-I Pectic Polysaccharides and Hesperidin Synergistically Modulate Gut Microbiota: An in Vitro Study Targeting the Proportional Relationship

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SSRN 2024年

作者： Wu, Jiaxiong Shen, Sihuan Cheng, Huan Pan, Haibo Ye, Xingqian Chen, Shiguo Chen, Jianle Ningbo Innovation Center Zhejiang University Ningbo315100 China College of Biosystems Engineering and Food Science National-Local Joint Engineering Laboratory of Intelligent Food Technology and Equipment Fuli Institute of Food Science Zhejiang Key Laboratory for Agro-Food Processing Zhejiang International Scientific and Technological Cooperation Base of Health Food Manufacturing and Quality Control Zhejiang University Hangzhou310058 China Zhejiang University Zhongyuan Institute Zhengzhou450000 China

In this study, we investigated how different proportions blends of RG-I pectic polysaccharides and hesperidin impact the gut microbiota and metabolites using an in vitro simulated digestion and fermentation model. The results indicated that both of them could modulate the gut microbiota and produce beneficial metabolites. However, their blends in particular proportions exhibited remarkable synergistic effects on modulating the intestinal microenvironment, surpassing the effects observed with individual components. Specifically, these blends could enhance acidogenic potential, increase short-chain fatty acids production, improve hesperidin bioavailability, and promote microbial diversity. This synergistic and additive effect was inseparable from the role of gut microbiota. Certain beneficial bacteria, such as Blautia, Faecalibacterium, and Prevotella, exhibited strong preferences for those blends, thereby contributing to host health through participating in carbohydrate and flavonoid metabolism. © 2024, The Authors. All rights reserved.

关键词： Metabolites

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Emerging contaminants:A One Health perspective

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The Innovation 2024年第4期5卷 140-170,139页

作者： Fang Wang Leilei Xiang Kelvin Sze-Yin Leung Martin Elsner Ying Zhang Yuming Guo Bo Pan Hongwen Sun Taicheng An Guangguo Ying Bryan WBrooks Deyi Hou Damian EHelbling Jianqiang Sun Hao Qiu Timothy MVogel Wei Zhang Yanzheng Gao Myrna JSimpson Yi Luo Scott XChang Guanyong Su Bryan MWong Tzung-May Fu Dong Zhu Karl JJobst Chengjun Ge Frederic Coulon Jean Damascene Harindintwali Xiankui Zeng Haijun Wang Yuhao Fu Zhong Wei Rainer Lohmann Changer Chen Yang Song Concepcion Sanchez-Cid Yu Wang Ali El-Naggar Yiming Yao Yanran Huang Japhet Cheuk-Fung Law Chenggang Gu Huizhong Shen Yanpeng Gao Chao Qin Hao Li Tong Zhang Natàlia Corcoll Min Liu Daniel SAlessi Hui Li Kristian KBrandt Yolanda Pico Cheng Gu Jianhua Guo Jianqiang Su Philippe Corvini Mao Ye Teresa Rocha-Santos Huan He Yi Yang Meiping Tong Weina Zhang Fidèle Suanon Ferdi Brahushi Zhenyu Wang Syed AHashsham Marko Virta Qingbin Yuan Gaofei Jiang Louis A.Tremblay Qingwei Bu Jichun Wu Willie Peijnenburg Edward Topp Xinde Cao Xin Jiang Minghui Zheng Taolin Zhang Yongming Luo Lizhong Zhu Xiangdong Li DamiàBarceló Jianmin Chen Baoshan Xing Wulf Amelung Zongwei Cai Ravi Naidu Qirong Shen Janusz Pawliszyn Yong-guan Zhu Andreas Schaeffer Matthias C.Rillig Fengchang Wu Gang Yu James M.Tiedje State Key Laboratory of Soil and Sustainable Agriculture Institute of Soil ScienceChinese Academy of SciencesNanjing 210008China University of Chinese Academy of Sciences Beijing 100049China Department of Chemistry Hong Kong Baptist UniversityHong KongChina HKBU Institute of Research and Continuing Education Shenzhen Virtual University ParkShenzhenChina Technical University of Munich TUM School of Natural SciencesInstitute of Hydrochemistry85748 GarchingGermany School of Resources&Environment Northeast Agricultural UniversityHarbin 150030China Climate Air Quality Research UnitSchool of Public Health and Preventive MedicineMonash UniversityMelbourneVICAustralia Faculty of Environmental Science&Engineering Kunming University of Science&TechnologyKunming 650500China Ministry of Education Key Laboratory of Pollution Processes and Environmental Criteria College of Environmental Science and EngineeringNankai UniversityTianjin 300350China Guangdong Key Laboratory of Environmental Catalysis and Health Risk Control School of Environmental Science and EngineeringInstitute of Environmental Health and Pollution ControlGuangdong University of TechnologyGuangzhou 510006China Ministry of Education Key Laboratory of Environmental Theoretical Chemistry South China Normal UniversityGuangzhouGuangdong 510006China Department of Environmental Science Baylor UniversityWacoTXUSA Center for Reservoir and Aquatic Systems Research(CRASR) Baylor UniversityWacoTXUSA School of Environment Tsinghua UniversityBeijing 100084China School of Civil and Environmental Engineering Cornell UniversityIthacaNY 14853USA Key Laboratory of Microbial Technology for Industrial Pollution Control of Zhejiang Province Zhejiang University of TechnologyHangzhou 310014China School of Environmental Science and Engineering Shanghai Jiao Tong UniversityShanghai 200240China Laboratoire d’Ecologie Microbienne Universite Claude Bernard Lyon 1UMR CNRS 5557UMR INRAE 1418VetAgro Sup69622 VilleurbanneFrance Department of Pla

Environmental pollution is escalating due to rapid global development that often prioritizes human needs over planetary *** global efforts to mitigate legacy pollutants,the continuous introduction of new substances remains a major threat to both people and the *** response,global initiatives are focusing on risk assessment and regulation of emerging contaminants,as demonstrated by the ongoing efforts to establish the UN’s Intergovernmental Science-Policy Panel on Chemicals,Waste,and Pollution *** review identifies the sources and impacts of emerging contaminants on planetary health,emphasizing the importance of adopting a One Health *** for monitoring and addressing these pollutants are discussed,underscoring the need for robust and socially equitable environmental policies at both regional and international *** actions are needed to transition toward sustainable pollution management practices to safeguard our planet for future generations.

关键词： pollution planet contaminants

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Full speed range sensorless control of IPMSM based on improved PSO optimization

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Dianji yu Kongzhi Xuebao/Electric Machines and control 2022年第9期26卷 130-139页

作者： Zhang, Rong-Yun Fang, Xing-Hui Shi, Pei-Cheng Zhao, Lin-Feng Du, Yu-Feng Gong, Chang-Fu School of Mechanical Engineering Anhui Polytechnic University Wuhu241000 China Automotive New Technology Anhui Engineering and Technology Research Center Anhui Polytechnic University Wuhu241000 China School of Automobile and Traffic Engineering Hefei University of Technology Hefei230009 China Key Laboratory of Advanced Perception and Intelligent Control of High-end Equipment Ministry of Education Anhui Polytechnic University Wuhu241000 China

In order to achieve all-speed range sensorless control of interior permanent magnet synchronous motor(IPMSM), A full speed range sensorless control strategy of IPMSM was proposed,and the improved particle swarm optimization was used to realize the smooth switching between different estimation methods. Firstly, the mathematical model of IPMSM was established. Secondly, according to the speed range when the motor was running, the speed was defined as zero-low speed range and medium-high speed range. The rotor speed and position of IPMSM were estimated by using high frequency injection method in zero-low speed range and sliding mode observer method in medium-high speed range on this basis. A method of variable weight coefficient based on improved particle swarm optimization algorithm was adopted to realize smooth switching between different estimation methods, and finally achieve the sensorless control of IPMSM at the all-speed range. The experimental results show that the proposed sensorless control strategy has good reliability and robustness, and can improve the estimation accuracy of rotor speed and position in the all-speed range, and make the switching between different estimation methods smoother. © 2022 Editorial Department of Electric Machines and control. All rights reserved.

关键词： Sensorless control

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Fracture Toughnesses and Crack Growth Angles of Single-Layer Graphyne Sheets

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Acta Mechanica Solida Sinica 2019年第3期32卷 339-355页

作者： Zonghuiyi Jiang Rong Lin Junhua Zhao Jiangsu Key Laboratory of Advanced Food Manufacturing Equipment and Technology Jiangnan University Wuxi 214122 China Institute of Mechanics and Advanced Materials School of Mechanical Engineering Jiangnan University Wuxi 214122 China

Recently, Shang et al.(Angew Chem Int Ed 57(3):774-778,2018) have developed a method to synthesize ultrathin (around 1.9 nm) graphyne nanosheets. We reported here the mixed-mode I-II fracture toughnesses and crack growth angles of single-layer graphyne sheets using molecular dynamics (MD) simulations and the finite element (FE) method based on the boundary layer model, respectively. The various carbon-carbon bonds of graphyne sheets in the FE method are equated with the nonlinear Timoshenko beams based on the Tersoff-Brenner potential, where all the parameters of the nonlinear beams are completely determined based on the continuum modeling. All the results from the present FE method are reasonable in comparison with those from our MD simulations using the REBO potential. The present results show that both the critical stress intensity factors (SIFs) and the crack growth angle strongly depend on the chirality and loading angle q @= 90° and #= 0° representing pure mode I and pure mode II, respectively). Meanwhile, the fracture properties of single-layer cyclicgraphene and supergraphene sheets are also studied in order to compare with those of the graphyne sheets. The critical equivalent SIFs are derived as 1.55 < *** (cyclic)< 1.95 nN A-3/2, 1.64 < *** (graphyne)< 2.64 nN A_3/<2 and 0.61 < Keq-su (super)< 2.04 nN A-3/2 in the corresponding zigzag and armchair sheets using the MD simulations, while the SIFs are 0.32 < Keq-cy (cyclic)< 0.48 nN A-3/,2, 1.96 < *** (graphyne)< 2.49 nN A-3^2 and 1.42 < Keq-su (super)< 2.95 nN A_3//2 using the FE method. These findings should be of great help for understanding the fracture properties of carbon allotropes and designing the carbon-based nanodevices.

关键词： Fracture toughness Graphyne Molecular dynamics Finite element

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An Enhanced Fuzzy Repetitive-control Design and Optimisation Method based on 2D Performance Index 10

An Enhanced Fuzzy Repetitive-Control Design and Optimisation...

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10th IEEE Data Driven control and Learning Systems Conference, DDCLS 2021

作者： Zhang, Manli Wu, Min Tian, Shengnan She, Jinhua 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 School of Engineering Tokyo University of Technology Hachioji192-0982 Japan

ISBN: (纸本)9781665424233

This paper concerns the design and optimisation of two-dimensional (2D) repetitive control of nonlinear systems based on the Takagi-Sugeno (T-S) fuzzy model. First, a continuous-discrete 2D model of nonlinear repetitive-control systems based on T-S fuzzy model is constructed by utilizing the 2D characteristics of continuous control and discrete learning actions in the repetitive-control process. Next, a fuzzy Lyapunov-Krasovskii functional derives the linear-matrix-inequality-based stability condition with a low conservatism. Two positive and two nonzero parameters in the fuzzy Lyapunov-Krasovskii functional tune the control and learning actions. Then the particle swarm optimisation algorithm based on a 2D performance index searches for the best parameter combination, resulting in the optimal 2D controller gains. A numerical example is given to demonstrate the effectiveness of the method. © 2021 IEEE.

关键词： Linear matrix inequalities

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Exploring parity magnetic effects through quantum simulation with superconducting qubits

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Physical Review Applied 2024年第3期21卷 034052-034052页

作者： Yu Zhang Yan-Qing Zhu Jianwen Xu Wen Zheng Dong Lan Giandomenico Palumbo Nathan Goldman Shi-Liang Zhu Xinsheng Tan Z.D. Wang Yang Yu National Laboratory of Solid State Microstructures School of Physics Nanjing University Nanjing 210093 China Shishan Laboratory Suzhou Campus of Nanjing University Suzhou 215000 China Guangdong-Hong Kong Joint Laboratory of Quantum Matter Department of Physics and HK Institute of Quantum Science & Technology The University of Hong Kong Pokfulam Road Hong Kong China Hefei National Laboratory Hefei 230088 China School of Theoretical Physics Dublin Institute for Advanced Studies 10 Burlington Road Dublin 4 Ireland Center for Nonlinear Phenomena and Complex Systems Université Libre de Bruxelles CP 231 Campus Plaine Brussels B-1050 Belgium Key Laboratory of Atomic and Subatomic Structure and Quantum Control (Ministry of Education) School of Physics South China Normal University Guangzhou 510006 China Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials Guangdong-Hong Kong Joint Laboratory of Quantum Matter South China Normal University Guangzhou 510006 China

We present a successful realization of four-dimensional semimetal bands featuring tensor monopoles, achieved using superconducting quantum circuits. Our experiment involves the creation of a highly tunable diamond energy diagram with four coupled transmons, and the parametric modulation of their tunable couplers, effectively mapping momentum space to parameter space. This approach enables us to establish a four-dimensional Dirac-like Hamiltonian with fourfold degenerate points. Moreover, we manipulate the energy of tensor monopoles by introducing an additional pump microwave field, generating effective magnetic and pseudoelectric fields and simulating topological parity magnetic effects emerging from the parity anomaly. Utilizing nonadiabatic response methods, we measure the fractional second Chern number for a Dirac valley with a varying mass term, signifying a nontrivial topological phase transition connected to a five-dimensional Yang monopole. Our work lays the foundation for further investigations into higher-dimensional topological states of matter and enriches our comprehension of topological phenomena.

关键词： Electronic structure Quantum circuits Quantum information with solid state qubits Quantum simulation Topological phases of matter Dirac semimetal Magnetic monopoles Superconducting qubits

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Effect of base metal pre-treatment on liquation cracking of K447A nickel-based superalloy repaired by laser cladding

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Journal of Alloys and Compounds 2025年 1034卷

作者： Gao, Zhihang Zhao, Yue Shan, Jiguo Liu, Yan Chen, Hui Zhang, Zhenlin Key Laboratory of Advanced Technologies of Materials School of Materials Science and Engineering Southwest Jiaotong University Chengdu610031 China High-end Equipment Advanced Materials and Manufacturing Technology Laboratory Chengdu610031 China Department of Mechanical Engineering Tsinghua University Beijing100084 China Key Laboratory for Advanced Materials Processing Technology Ministry of Education Beijing100084 China

Liquation cracking in the heat-affected zone (HAZ) remains a critical challenge during laser cladding repair of K447A nickel-based superalloy. In this study, the base metal (BM) was pre-treated at graded temperatures of 1150 °C, 1200 °C, and 1250 °C to systematically investigate the influence of BM conditions on HAZ liquation cracking during laser cladding repair. The results reveal that the crack tendency first decreases and then increases as the pre-treatment temperature rises. The BM pre-treated at 1200 °C exhibiting the lowest liquation cracking tendency. In this case, the longitudinal section includes four cracks and a total crack length of 119.7 μm, in which the longest crack is 42.4 μm. Compared to those of the as-cast BM, these values are reduced by 68 %, 91 %, and 87 %, respectively. As-cast BM consists of the γ matrix, γ' phase, M5B3 phase, and Ni21Hf8 phase. The BM specimens pre-treated at 1150 °C and 1200 °C are both composed of the γ matrix, γ' phase, M5B3 phase, and MC(2) carbide, primarily due to the decomposition of Ni21Hf8 at high temperatures, and the released Hf element combines with the carbon in the matrix to form MC(2). However, compared with the BM pre-treated at 1150 °C, the boride content in the BM pre-treated at 1200 °C is significantly reduced. The microstructure of the BM pre-treated at 1250 °C is similar to that of the as-cast BM. This is attributed to the liquation of Ni21Hf8 during the pre-treatment process and the re-precipitation of Ni21Hf8 and nickel-rich borides during cooling. Pre-treatment alters the BM's microstructure, which in turn changes the liquation temperature and mechanism in the HAZ during laser cladding. This change affects the liquation cracking tendency of the BM. As the pre-treatment temperature increases, the initial melting temperature of the BM first increases and then decreases. Compared with the as-cast BM, the initial melting reaction of the BM pre-treated at 1200 °C shifts to M5B3/γ component liquation. The i

关键词： Heat affected zone

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