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Research on ECMS Based on Segmented Path Braking Energy Reco.ery in a Fuel Cell Vehicle

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Energy Engineering 2024年第1期121卷 95-110页

作者： Wen Sun Meijing Li Guoxiang Li Ke Sun Shuzhan Bai School of Energy and Power Engineering Shandong UniversityJinan250061China Automotive Research Institute China National Heavy Duty Truck Group Co.Ltd.Jinan250061China

Proton exchange membrane fuel cells are widely regarded as having the potential to replace internal co.bustion engines in *** fuel cells cannot reco.er energy and have a slow dynamic response,they need to be used with different power *** efficient energy management strategies to achieve excellent fuel eco.omy is the goal of *** paper proposes an adaptive equivalent fuel minimum co.sumption strategy(AECMS)to solve the problem of the poor eco.omy of the whole vehicle caused by the wrong selection of equivalent factors(EF)in traditional *** this method,the kinematics interval is used to update the equivalent factor by co.sidering the penalty term of energy reco.ery on SOC ***,the optimized equivalent factor is substituted into the optimization objective function to achieve efficient energy *** results under the New European Driving Cycle show that co.pared with the traditional ECMS based on fixed SOC benchmarks,the proposed method improves fuel eco.omy by 1.7%while ensuring vehicle power and increases SOC by 30%.

关键词： Fuel cell PEMFC electric vehicle equivalent co.sumption minimization strategy

A portable,auxiliary photovoltaic power system for electric vehicles based on a foldable scissors mechanism

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Energy and Built Environment 2024年第1期5卷 81-96页

作者： Zhou Jin Dongyang Li Daning Hao Zutao Zhang Liang Guo Xiaoping Wu Yanping Yuan China Railway Wuhan Electrification Bureau group Shanghai Electric co. LtdShanghai 201799PR China School of Mechanical Engineering Southwest Jiaotong UniversityChengdu 610031PR China

In recent years,co.ntries worldwide have actively advocated electric vehicles for environmental ***-ever,restrictions on the driving range and charging have hampered the promotion of electric *** study proposes a portable,auxiliary photovoltaic power system based on a foldable scissors mechanism for electric *** system includes a photovoltaic power generation module and an electricity transfer *** photovoltaic power generation module built based on a foldable scissors mechanism is five times smaller than in its unfolded state,improving its portability in its folded *** electricity transfer module transfers electricity into the cabin via wireless power transfer units and stores electricity in *** simulation exper-iments were co.ducted to evaluate the system’s performance:maximum output power of 1.736 W is measured when the load is 5Ω,while maximum wireless power transfer efficiency is up to 57.7% with 10Ω *** elec-tric vehicle in Chengdu city was simulated for a case *** results show that the annual output of a single photovoltaic power system can drive the MINIEV for 423.625 km,indicating that the proposed system would be able to supply power for electric vehicles as an auxiliary power supply system.

关键词： Auxiliary photovoltaic power system Energy harvesting Scissors mechanism Solar co.lector Electric vehicle

Data and Model Driven Task Offloading Strategy in the Dynamic Mobile Edge co.puting System

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Journal of Systems Science & co.plexity 2024年第1期37卷 351-368页

作者： DONG Hairong WU Wei SONG Haifeng LIU Zhen ZHANG Zixuan School of Electronic and Information Engineering Beijing Jiaotong UniversityBeijing 100044China School of Electronic and Information Engineering BeiHang UniversityBeijing 100191China CRSC Research&Design Institute group co. Ltd.Beijing 100070China

Mobile Edge co.puting(MEC)provides co.munication and co.putational capabilities for the industrial Internet,meeting the demands of latency-sensitive ***,traditional model-driven task offloading strategies face challenges in adapting to situations with unknown network co.munication status and co.putational *** limitation beco.es notably significant in co.plex industrial networks of high-speed *** by these co.siderations,a data and model-driven task offloading problem is proposed in this paper.A redundant co.munication network is designed to adapt to anomalous channel states when tasks are offloaded to edge *** link switching mechanism is executed by the train acco.ding to the attributes of the co.pleted *** task offloading optimization problem is formulated by introducing data-driven prediction of co.munication states into the traditional ***,the optimal strategy is achieved by employing the informer-based prediction algorithm and the quantum particle swarm optimization method,which effectively tackle real-time optimization problems due to their low time *** simulations illustrate that the data and model-driven task offloading strategy can predict the co.munication state in advance,thus reducing the co.t of the system and improving its robustness.

关键词： Data driven model informer mobile edge co.puting quantum particle swarm optimization task offloading.

Impact Damage Testing Study of Shanxi-Beijing Natural Gas Pipeline Based on Decision Tree Rotary Tiller Operation

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Structural Durability & Health Monitoring 2024年第5期18卷 683-706页

作者： Liqiong Chen Kai Zhang Song Yang Duo Xu Weihe Huang Hongxuan Hu Haonan Liu School of Petroleum and Natural Gas Engineering Southwest Petroleum UniversityChengdu610500China National Pipe Network group Southwest Pipeline co. Chengdu610500China

The North China Plain and the agricultural region are crossed by the Shanxi-Beijing natural gas ***-dents in the area use rototillers for planting and harvesting;however,the depth of the rototillers into the ground is greater than the depth of the pipeline,posing a signiﬁcant threat to the safe operation of the ***,it is of great signiﬁcance to study the dynamic response of rotary tillers impacting pipelines to ensure the safe opera-tion of *** article focuses on the Shanxi-Beijing natural gas pipeline,utilizingﬁnite element simulation software to establish aﬁnite element model for the interaction among the machinery,pipeline,and soil,and ana-lyzing the dynamic response of the *** the same time,a decision tree model is introduced to classify the damage of pipelines under different working co.ditions,and the boundary value and importance of each inﬂuen-cing factor on pipeline damage are *** the actual co.ditions in the hemp yam planting area,targeted management measures have been proposed to ensure the operational safety of the Shanxi-Beijing natural gas pipeline in this region.

关键词： Natural gas pipeline rotary tiller operation third-party damage ﬁnite element simulation decision tree model safety management

Evolutionary Multi-Tasking Optimization for High-Efficiency Time Series Data Clustering

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Tsinghua Science and Technology 2024年第2期29卷 343-355页

作者： Rui Wang Wenhua Li Kaili Shen Tao Zhang Xiangke Liao Xiangjiang Laboratory Changsha 410205China co.lege of Systems Engineering National University of Defense TechnologyChangsha 410073China Ant group co. Ltd.Hangzhou 310000China co.lege of co.puter Science and Technology NUDTChangsha 410073China

Time series clustering is a challenging problem due to the large-volume,high-dimensional,and warping characteristics of time series *** clustering methods often use a single criterion or distance measure,which may not capture all the features of the *** paper proposes a novel method for time series clustering based on evolutionary multi-tasking optimization,termed i-MFEA,which uses an improved multifactorial evolutionary algorithm to optimize multiple clustering tasks simultaneously,each with a different validity index or distance ***,i-MFEA can produce diverse and robust clustering solutions that satisfy various preferences of *** on two artificial datasets show that i-MFEA outperforms single-objective evolutionary algorithms and traditional clustering methods in terms of co.vergence speed and clustering *** paper also discusses how i-MFEA can address two long-standing issues in time series clustering:the choice of appropriate similarity measure and the number of clusters.

关键词： time series clustering evolutionary multi-tasking multifactorial optimization clustering validity index distance measure

Utilization of recycled solid waste as eco.ogical reclamation materials based on plant growth experiments and soil quality analysis

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Journal of Mountain Science 2024年第3期21卷 820-834页

作者： QIN Xiaochun NI Anchen YANG Dongxiao XING Wenhu LIU Shiliang co.lege of Civil Engineering Beijing Jiaotong UniversityBeijing 100044China Shanxi Road&Bridge co.struction group co. LtdShanxi 030006China School of Environment Beijing Normal UniversityBeijing 111875China

During the highway co.struction,a large number of spoil areas will be generated while a large amount of waste slag and soil co.ld not be rationally ***,the vegetation reco.ery is slow in the spoil areas due to the soil *** at recycling the solid waste,the sieved engineering waste slag with local red clay and co.n straw biochar was supplied to solve the problem of insufficient nutrients in engineering waste slag and *** addition,planting experiments of alfalfa(Medicago sativa L.)and Amorpha frutico.a *** with physical and chemical experiments were carried out to prove the feasibility of the novel improved substrate for the reclamation of spoil *** results show that the substrate's improvement effect is mainly affected by the soil to slag ratio and the biochar *** improvement effect of soil matrix in highway spoil area decreases with the increase of the waste slag co.tent,especially when the soil-slag ratio is less than 3,and the promotion of plants is *** the co.trary,the improvement effect is proportional to the biochar co.tent(3%-8%).But it is noted that the Cu and Pb in the soil will exceed the clean limit co.responding to the Nemero soil pollution index level when the biochar co.tent is 8%.Therefore,it is reco.mended that the soil-slag ratio should be≥3,and the biochar co.tent should reach 3%-5%.This research provides experimental basis and technical support for utilizing solid waste resources in the reclamation of highway spoil areas.

关键词： Highway Spoil area Waste slag Modified soil Eco.ogical reclamation

Optimal Initialization and Starting Approach of Synchronous co.denser Integrated Power Grid

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CSEE Journal of Power and Energy Systems 2024年第1期10卷 248-260页

作者： Puyu Wang Xing Liu Qingwen Mou Tao Yuan Tianming Gu Hemin Yang Xiao-Ping Zhang Zhengrong Xiang Chunyi Guo School of Automation Nanjing University of Science and TechnologyNanjing 210094China NARI group co.poration/State Grid epri and also with NARI Technology co.Ltd. Nanjing 211106China School of Engineering University of BirminghamBirminghamB152TTUnited Kingdom State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power UniversityBeijing 102206China

Synchronous co.densers(SCs)are generally used at the receiving-end stations of ultra-high-voltage direct current(UHVDC)transmission systems due to their strong reactive power support and flexible regulation of reactive power acco.ding to the interco.nected grids operating *** this paper,different starting co.trol schemes of a SC integrated power grid are investigated providing four main co.tributions:1)The principle of reactive power support of the SC on the interco.nected power grid is analytically studied,providing the establishment of mathematical models.2)Four different starting co.trol schemes are developed for the initialization and SC integration,*** Scheme 1,a preset initial falling speed is directly utilized without initialization;in Scheme 2,a black start sequential co.trol approach with a static frequency co.verter(SFC)is proposed;in Scheme 3,PI/PD/PID co.trollers are respectively applied for the excitation device at the speed-falling stage;in Scheme 4,a pre-insertion approach of an energy absorption co.ponent with R/L/RL is utilized to suppress the surges at the SC integration instant.3)The dynamic behaviors of four different starting schemes at specific operating stages are evaluated.4)The success rate of SC integration is analyzed to evaluate starting co.trol *** of the SC interco.nected system with four different starting co.trol schemes is evaluated in the timedomain simulation environment PSCAD/EMTDC^(TM).The results prove the superiority of the proposed starting co.trol approach in Scheme 4.

关键词： Black start dynamic behaviors excitation system pre-insertion of energy absorption co.ponents starting co.trol schemes static frequency co.verter(SFC) success rate of integration synchronous co.denser(SC)

AB_(2)-type rare earth-based co.pounds with C-15 structure:Looking for reversible hydrogen storage materials

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Journal of Rare Earths 2024年第5期42卷 803-816,I0001页

作者： Hao Shen Junxian Zhang Valerie Paul-Bonco.r Ping Li Zhinian Li Yuanfang Wu Lijun Jiang National Engineering Research Center of Nonferrous Metals Materias and Products for New Energy GRINM Group Co.LtdBeijing00088China Univ Paris Est Creteil CNRSICMPEUMR 71822 rue Henri Dunant94320ThiaisFrance Institute for Advanced Materials and Technology University of Science and TechnologyBeijing100083China GRIMAT Engineering Institute co. Ltd.Beijing101407China

AB_(2)-type(A=rare earth,B=transition metal)intermetallic co.pounds with C15 structure can easily absorb large amount of hydrogen,showing their potential use as hydrogen storage *** crucial problem hindering their application is hydrogen induced amorphization(HIA),which leads to the irreversible hydrogen sorption *** stability of the AB_2 Laves phase co.pounds,the structural properties,the hydrogenation properties and the co.trolling factors of HIA are discussed in this *** with other factors,the atomic radii ratio r_A/r_B is the most important one influencing the ***-element substitution is an efficient way to suppress or limit HIA and may enable AB_2 co.pounds to be suitable for hydrogen storage.

关键词： Rare earth-based AB_2-type co.pounds Hydrogenation properties Hydrogen induced amorphization Elemental substitution

Performance of water-co.pled charge blasting under different in-situ stresses

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Journal of Central South University 2024年第7期31卷 2300-2320页

作者： ZHOU Zi-long WANG Zhen CHENG Rui-shan CAI Xin LAN Ri-yan School of Resources and Safety Engineering Central South UniversityChangsha 410083China Center for Infrastructural Monitoring and Protection School of Civil and Mechanical EngineeringCurtin UniversityBentleyAustralia Guangxi Xinfazhan co.munication group co. Ltd.Nanning 530000China

Water-co.pled charge blasting is a promising technique to efficiently break rock *** this study,numerical models of double boreholes with water-co.pled charge are established using LS-DYNA and are calibrated by the tests of rock masses subjected to explosion loads to examine its *** crack levels of rock mass induced by water-co.pled charge blasting and air-co.pled charge blasting are first *** is found that water-co.pled charge blasting is more appropriate to fracture deep rock mass than air-co.pled charge *** addition,the effects of rock properties,water-co.pled charge co.fficients,and borehole co.nection angles on the performance of water-co.pled charge blasting are *** results show that rock properties and water-co.pled charge co.fficients can greatly influence the crack and fragmentation levels of rock mass induced by water-co.pled charge blasting under uniform and non-uniform in-situ ***,changing borehole-co.nection angles can only affect crack and fragmentation levels of rock mass under non-uniform in-situ stresses but barely affect those under uniform in-situ stresses.A formula is finally proposed by co.sidering the above-mentioned factors to provide the design suggestion of water-co.pled charge blasting to fracture rock mass with different in-situ stresses.

关键词： water-co.pled blasting in-situ stress water-co.pled charge co.fficient rock type borehole-co.nection angle