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Study on operation voltage monitoring and electrothermal coupling simulation of electric multiple unit(EMU)roof arrester

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High Voltage 2022年第2期7卷 357-368页

作者： Qizhe Zhang shenghui wang Kaixuan Sun Xinghao Dong Mingliang Liu Fangcheng Lü State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power UniversityBeijingChina Hebei Provincial Key Laboratory of Power Transmission Equipment Security Defense North China Electric Power UniversityBaodingChina

The roof arrester of electric multiple units(EMU)can efficiently limit the overvoltage,and ensure the safe operation of the EMU electrical *** the process of high‐speed operation,the traction power supply system is often affected by *** addition,roof arrester explosion accidents occasionally *** this paper,the on‐line voltage measurement system of the EMU arrester is *** analysing a large number of voltage waveforms,the abnormal voltage is divided into three categories:over‐phase voltage,high harmonic voltage and steep impulse *** charac-teristics of abnormal voltage waveforms are then *** electrothermal coupling simulation model of the arrester is developed,and the current response and temperature distribution of the arrester under abnormal voltage are *** impact of the impulse voltage energy on the arrester temperature is studied by applying a triangular wave voltage to the ***,some suggestions are proposed for the operation and maintenance of the roof arrester.

关键词： operation traction coupling

Modified Coffin-Manson equation to predict the fatigue life of structural materials subjected to mechanical-thermal coupling non-coaxial loading

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Journal of Materials Science & Technology 2023年第29期160卷 118-127页

作者： Zhichao Ma Chaofan Li Wei Zhang shenghui wang Jiakai Li Hongwei Zhao Luquan Ren School of Mechanical and Aerospace Engineering Jilin UniversityChangchun 130025China Key Laboratory of CNC Equipment Reliability Ministry of EducationJilin UniversityChangchun 130025China Key Laboratory of Bionic Engineering Ministry of Education Jilin UniversityChangchun 130025China

With regard to the structures subjected to severe mechanical-thermal coupling fatigue conditions,the consistency between service conditions and loading conditions was the prerequisite for the fatigue prop-erties test and fatigue life prediction.A miniature piezoelectric-driven instrument integrating with a tripodal piezoelectric actuator and envelope-type heating function was developed to investigate the mechanical-thermal coupling fatigue properties and obtain the fatigue life of materials under approximate service conditions.A physical model was described to quantitatively calculate the alternating deformation under the mechanical-thermal coupling tensile-bending combined ***,a fatigue life prediction method based on the Coffin-Manson equation under tensile-bending combined loading was proposed to estimate the mechanical-thermal coupling fatigue life in terms of the total coupling defor-mation and plastic strain *** feasibility of the proposed instrument was verified through the analysis of displacement responses of high entropy alloy specimens under the thermal-mechanical cou-pling tensile-bending combined condition at temperatures ranging from RT to 600°*** comparison between fatigue lives directly measured through thermal-mechanical coupling experiments and theoreti-cally predicted fatigue lives indicated the availability of the modified Coffin-Manson equation.

关键词： Fatigue testing instrument Mechanical-thermal coupling Combined loading Fatigue life prediction odified Coffin-Manson equation

Effect of organophilic group of coupling agent on the electrical performance of Boron Nitride/meta-aramid composite paper

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High Voltage 2023年第4期8卷 760-771页

作者： Haoou Ruan Qing Xie Jingxuan Song shenghui wang Xiaobin Chang Yuqin Xu Fangcheng Lü State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power UniversityBeijingChina Ganzhou Longpunt Material Technology Co. LtdGanzhouChina

Organophilic groups of coupling agents can be the key factor for the electrical performance of Boron Nitride(BN)/meta-aramid composite *** this article,four types of triethoxy-silane coupling agents with different organophilic groups,including mercaptopropyl(MP),glycidylether-propyl(GP),amino-propyl(AP)and trideca-fluoro-octyl(TFO)were *** structural and electrical properties of modified papers were compared,and the molecular simulation was conducted to reveal the interface interaction of modified BN and *** results show that AP,GP and MP follow the same mechanism,improving the electrical performance by modifying the interface stability and paper structure,and the ranks of improving effects are AP,MP and ***,TFO mainly relies on the fluorine components to implement the electrical reinforcement,which compensates for the shortcoming in the paper *** choosing TFO and filler content of 15 wt%,the optimal breakdown strength of the paper can be increased to 28.17 kV/mm,1.8 times that of the paper doped with the hydroxylated BN.

关键词： composite electrical coupling

MnO_x/Al_2O_3/Ce_(0.45)Zr_(0.45)M_(0.10)O_y (M = Mn, Y, La) catalysts used for ethanol catalytic combustion

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Journal of Natural Gas Chemistry 2009年第1期18卷 83-87页

作者： Hongyan Cao Weicong Song Maochu Gong Jianli wang shenghui Yan Zhimin Liu Yaoqiang Chen Key Laboratory of Green Chemistry ＆ Technology Ministry of Education College of Chemistry Sichuan University Chengdu 610064 Sichuan China

MnOx/Al2O3/Ce0.45Zr0.45M0.10Oy （M = Mn, Y, La） catalysts were prepared by impregnation method and characterized by BET, TPR and XRD analyses. The catalytic activities toward ethanol combustion were investigated in a microreactor. The results demonstrated that the catalytic activity of MnOx/Al2O3/Ce0.50Zr0.50O2 monolithic catalyst could be improved by doping Mn, Y and La into Ce0.50Zr0.50O2. When doping Y into Ce0.50Zr0.50O2, the catalyst MnOx/Al2O3/Ce0.45Zr0.45Y0.10O1.95 showed the highest activity. The 100% conversion temperature of ethanol was 230℃. Furthermore, once the conversion of ethanol started, the complete conversion was quickly achieved. The doping of Mn, Y and La led to better activity for ethanol combustion and lower temperature reduction peaks in TPR profiles. The doping of Mn resulted in enhanced oxygen storage capacity （OSC）, larger area of the reduction peaks, and excellent reactivity, and the doping of Y resulted in the lowest reduction temperature and the best activity.

关键词： MnOx ethanol ceria-zirconia solid solutions doping

Overdischarge-induced evolution of Cu dendrites and degradation of mechanical properties in lithium-ion batteries

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Journal of Energy Chemistry 2023年第3期78卷 497-506,I0014页

作者： Zixin Guo Siguo Yang Wenyang Zhao shenghui wang Jiong Liu Zhichao Ma Hongwei Zhao Luquan Ren Key Laboratory of CNC Equipment Reliability Ministry of EducationJilin UniversityChangchun 130025JilinChina School of Mechanical and Aerospace Engineering Jilin UniversityChangchun 130015JilinChina Key Laboratory of Bionic Engineering Ministry of Education Jilin UniversityChangchun 130025JilinChina Weihai Institute for Bionics-Jilin University Weihai 264400ShandongChina

The degradation of mechanical properties of overdischarge battery materials manifests as a significant effect on the energy density,safety,and cycle life of the ***,establishing the correlation between depth of overdischarge and mechanical properties is still a significant *** the correlation between depth of overdischarge and mechanical properties is of great significance to improving the energy density and the ability to resist abuse of the *** this paper,the mechanical properties of the battery materials during the whole process of overdischarge from discharge to complete failure were *** effects of depth of overdischarge on the elastic modulus and hardness of the cathode of the battery,the tensile strength and the thermal shrinkage rate of the separator,and the performance of binder were *** precipitation of Cu dendrites on the separator and cathode after dissolution of anode copper foil is a key factor affecting the performance of battery *** Cu dendrites attached to the cathode penetrate the separator,causing irreversible damage to the coating and base film of the separator,which leads to a sharp decline in the tensile strength,thermal shrinkage rate and other properties of the *** addition,the Cu dendrites wrapping the cathode active particles reduce the adhesion of the active particles ***,the active particles are damaged,resulting in a significant decrease in the elastic modulus and hardness of the cathode.

关键词： Overdischarge Cu dendrites Mechanical properties Nanoindentation Micron scratch

Guidance Law Based on Block Backstepping and Input-to-State Stability 36

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Guidance Law Based on Block Backstepping and Input-to-State ...

Estimation of inverse Compton peak frequency for 4FGL Blazars

第36届中国控制会议

作者： shenghui wang Kun Li Haibo Ji Kaihong Yang Department of Automation University of Science and Technology of China

ISBN: (纸本)9781538629185

A novel three-dimensional nonlinear guidance law is proposed based on block backstepping method and input-to-state stability theory for interception of maneuvering targets（evaders）.By viewing the target acceleration as a bounded disturbance input,input-to-state stability theory is utilized to design a state feedback guidance law so as to achieve robust tracking to the maneuvering *** stability analysis as well as the simulation results shows that the proposed approach can lead to successful interception of maneuvering target.

关键词： Block Backstepping Input-to-State Stability Uncertainties Robustness

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Science China(Physics,Mechanics & Astronomy) 2023年第4期66卷 142-157页

作者： JiangHe Yang JunHui Fan Yi Liu ManXian Tuo ZhiYuan Pei WenXin Yang YuHai Yuan SiLe He shenghui wang XiaoHai Qu YueLian Zhang JianJun Nie XiuHui Chen College of Mathematics and Physics Science Hunan University of Arts and ScienceChangde 415000China Center for Astrophysics Guangzhou UniversityGuangzhou 510006China Astronomy Science and Technology Research Laboratory of Department of Education of Guangdong Province Guangzhou 510006China

This study uses a parabolic equation to fit the Inverse Compton (IC) spectral component of 3743 blazars (794 FSRQs,1432 BLLacs,and 1517 BCUs) from the 4FGL-DR3 *** mutual correlations are investigated,and a Bayesian classification is performed to the IC peak *** analyses draw the following conclusions:(1) The Bayesian classification shows two components with a dividing boundary of log(v_(p)^(IC)/Hz)pIC=***,the 3743 blazars are divided into low IC peak frequency(LCP) blazars and high IC peak frequency (HCP) blazars.(2) A strong linear correlation exists between IC peak frequency(logv_(p)^(IC)) and γ-ray photon spectral index (Γ).The IC peak frequency can be estimated by an empirical relation logv_(p)^(IC)=–4.5·Γ+32.8 for BL Lacs and logv_(p)^(IC)=4.0+31.4pICfor FSRQs,which is consistent with the result by Abdo et al.(3) The ICspectral curvature and IC peak frequency are not as closely related as the synchrotron curvature and the synchrotron peak frequency.(4) An anti-correlation exists between IC peak frequency and IC peak luminosity,implying that as the IC peak frequency in the γ-ray band decreases,the source becomes more *** beaming effect is stronger for the source with a lower IC peak frequency.(5) Positive correlations exist between IC and synchrotron components for both peak frequencies and peak fluxes,but no clear correlation exists between IC curvature and synchrotron curvature.

关键词： active galactic nuclei Fermi blazars spectral energy distribution inverse Compton emission

Design on Heterogeneous Seamless Integration of Wireless Data Acquisition System

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Design on Heterogeneous Seamless Integration of Wireless Dat...

Studies on photoprotective mechanism of desert plant Reaumuria soongorica under progressive soil drying

2012年计算机应用与系统建模国际会议

作者： wang shenghui Jiang Changhong Jin Xing Institute of Electric and Electronics Engineering Changchun University of Technology

Based on wireless sensor network technology, this paper focuses on the study of the problem of heterogeneous seamless integration of multi-sensor nodes and puts forward a correlation protocol concerning SMAC multi-point, multi-type sensor network nodes self-organizing wireless networking application. This technology has been used in the energy source information acquisition system of a concentrating mill, which has realized 738 site collecting points, 6 types of sensor nodes, the real-time acquisition of 8 types of power information and 6 types of additional information, and has constructed a heterogeneous wireless network platform of information sharing and interactive control.

关键词： Wireless sensor network Heterogeneous seamless integration Data acquisition system

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Research in Cold and Arid Regions 2010年第3期2卷 235-240页

作者： YuBing Liu MeiLing Liu HuiJuan Tan Jin wang shenghui Zhou Extreme Stress Resistance and Biotechnology Laboratory Shapotou Desert Research & Experiment Station Cold and Arid Re- gions Environmental and Engineering Research Institute Chinese Academy of Sciences Lanzhou Gansu 730000 China

Reaumuria soongorica （pall.） Maxim, a perennial desert semi-shrub, is widely found in semi-arid areas of China. It shows strong tolerance to drought, high temperature and intense radiation in its natural habitat. In the present study, photoprotective mechanism of R. soongorica was investigated by analyzing diurnal variations of gas exchange and chlorophyll fluorecence parameters during progressive soil drying. The results show that leaf water potential of R. soongorica decreased when the soil water content dropped. Diurnal patterns of net photosynthetic rate （Pn） changed from ＂two peaks＂ to ＂one peak＂ under drought stress, and the leaf water use efficiency （WUE） increased under moderate drought and declined under severe drought. Pn , the primary maximum photochemical efficiency of PSII （Fv/Fm） and the quantum efficiency of non-cyclic electron transport of PSII （ΦPSII） decreased obviously at noon, and showed a photoinhibition phenomenon. But, the non-photochemical quenching of fluorescence （NPQ） soon reached its maximum in the day and then remained almost at the high level until 17：00, indicating that the xanthophylls cycle-dependent thermal energy dissipation played an important role. Diurnal variations of the original chlorophyll fluorescence （Fo） increased at first and then decreased. The increased value of F o under drought stress indicates that there was a reversible inactivation of PSII reaction center. These results indicate that the photoprotective mechanism in R. soongorica was the photoinhibition by using both the xanthophylls cycle-dependent thermal energy dissipation and the reversible inactivation of PSII reaction center under drought stress.

关键词： chlorophyll fluorescence drought stress net photosynthesis rate photo inhibition Reaumuria soongorica