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| 1 | Model Predictive Current Control with Adaptive-adjusting Timescales for PMSMs显示文摘A model predictive current control(MPCC)with adaptive-adjusting method of timescales for permanent magnet synchronous motors(PMSMs)is proposed in this paper to improve the dynamic response and prediction accuracy in transient-state,while lessening the computational burden and improving the control performance in steady-state.The timescale characteristics of different parts of MPCC,such as signal sampling,prediction calculation,control output,model error correction,are analyzed,and the algorithm architecture of MPCC with multi-timescale is proposed.The difference between reference and actual speed,and the change rate of actual speed are utilized to discriminate the transient state of speed change and load change,respectively.Adaptive-adjusting method of control period and prediction stepsize are illustrated in detail after operation condition discrimination.Experimental results of a PMSM are presented to validate the effectiveness of proposed MPCC.In addition,comparative evaluation of single-step MPCC with fixed timescale and proposed MPCC is conducted,which demonstrates the superiority of proposed control strategy. | Feng Niu Xi Chen Shaopo Huang Xiaoyan Huang Lijian Wu Kui Li Youtong Fang | 2021 | CES Transactions on Electrical Machines and Systems2021，5，2： | 8 |
| 2 | Elimination of Fuel Pressure Fluctuation and Multi-injection Fuel Mass Deviation of High Pressure Common-rail Fuel Injection System显示文摘The influence of fuel pressure fluctuation on multi-injection fuel mass deviation has been studied a lot,but the fuel pressure fluctuation at injector inlet is still not eliminated efficiently.In this paper,a new type of hydraulic filter consisting of a damping hole and a chamber is developed for elimination of fuel pressure fluctuation and multi-injection fuel mass deviation.Linear model of the improved high pressure common-rail system(HPCRS)including injector,the pipe connecting common-rail with injector and the hydraulic filter is built.Fuel pressure fluctuation at injector inlet,on which frequency domain analysis is conducted through fast Fourier transformation,is acquired at different target pressure and different damping hole diameter experimentally.The linear model is validated and can predict the natural frequencies of the system.Influence of damping hole diameter on fuel pressure fluctuation is analyzed qualitatively based on the linear model,and it can be inferred that an optimal diameter of the damping hole for elimination of fuel pressure fluctuation exists.Fuel pressure fluctuation and fuel mass deviation under different damping hole diameters are measured experimentally,and it is testified that the amplitude of both fuel pressure fluctuation and fuel mass deviation decreases first and then increases with the increasing of damping hole diameter.The amplitude of main injection fuel mass deviation can be reduced by 73%at most under pilot-main injection mode,and the amplitude of post injection fuel mass deviation can be reduced by 92%at most under main-post injection mode.Fuel mass of a single injection increases with the increasing of the damping hole diameter.The hydraulic filter proposed by this research can be potentially used to eliminate fuel pressure fluctuation at injector inlet and improve the stability of HPCRS fuel injection. | LI Pimao ZHANG Youtong LI Tieshuan XIE Lizhe | 2015 | Chinese Journal of Mechanical Engineering2015，28，2： | 8 |
| 3 | High strength and high conductivity Cu alloys: A review显示文摘High strength and high conductivity(HSHC) Cu alloys are widely used in many fields,such as high-speed electric railway contact wires and integrated circuit lead frames. Pure Cu is well known to have excellent electrical conductivity but rather low strength. The main concern of HSHC Cu alloys is how to strengthen the alloy efficiently. However,when the Cu alloys are strengthened by a certain method,their electrical conductivity will inevitably decrease to a certain extent. This review introduces the strengthening methods of HSHC Cu alloys. Then the research progress of some typical HSHC Cu alloys such as Cu-Cr-Zr,Cu-Ni-Si,Cu-Ag,Cu-Mg is reviewed according to different alloy systems. Finally,the development trend of HSHC Cu alloys is forecasted. It is pointed out that precipitation and micro-alloying are effective ways to improve the performance of HSHC Cu alloys. At the same time,the production of HSHC Cu alloys also needs to comply with the large-scale,low-cost development trend of industrialization in the future. | YANG HuiYa MA ZiChao LEI ChenHui MENG Liang FANG YouTong LIU JiaBin WANG HongTao | 2020 | Science China(Technological Sciences)2020，63，12： | 7 |
| 4 | Trace bis-(3-sulfopropyl)-disulfide enhanced electrodeposited copper foils显示文摘Smooth and strong copper foils are highly required for the development of printed circuit boards and Li-ion batteries.Adding additives is an efficient and low-cost method to enhance electrodeposited copper foils.Here we chose Bis-(3-sulfopropyl)-disulfide(SPS)as the additive and investigated its concentration on the surface roughness and tensile strength of the electrodeposited copper foils.A copper foil with the smoothest surface(Rz=2.1μm)and the highest tensile strength(~338 MPa)was prepared with1.5 mg/L SPS.The contact angle on the copper foil decreased with the reduction of surface roughness.The enhancing mechanism of the SPS was investigated by scanning electron microscopy and X-ray diffraction.The refined grain and enhanced(220)texture were considered to be the radical reason for the smooth and strong copper foils.The electrochemical results prove the suppressing effect is related to the SPS adsorption. | Lingling Liu Yeqiang Bu Yue Sun Jianfeng Pan Jiabin Liu Jien Ma Lin Qiu Youtong Fang | 2021 | Journal of Materials Science & Technology2021，，15： | 6 |
| 5 | Driving Range Parametric Analysis of Electric Vehicles Driven by Interior Permanent Magnet Motors Considering Driving Cycles显示文摘This paper presents parametric analysis of driving range of electric vehicles driven by V-type interior permanent magnet motors aiming at maximum driving range,i.e.,minimal total energy consumption of the motors over a driving cycle.Influence of design parameters including tooth width,slot depth,split ratio(the ratio of inner diameter to outer diameter of the stator),and V-type magnet angle on the energy consumption of the motors and driving range of electric vehicles over a driving cycle is investigated in detail.The investigation is carried out for two typical driving cycles with different characteristics to represent different conditions:One is high-speed,low-torque cycle-Highway Fuel Economy Test and the other is low-speed,high-torque cycle-Artemis Urban Driving Cycle.It shows that for both driving cycles,the same parameters may have different influence on the energy consumption of the motors,as well as driving range of electric vehicles. | Le Tian Lijian Wu Xiaoyan Huang Youtong Fang | 2019 | CES Transactions on Electrical Machines and Systems2019，3，4： | 4 |
| 6 | Homogeneous arc ablation behaviors of CuCr cathodes improved by chromic oxide显示文摘Cathode ablation is one of the dominant limitations for extending the maximum operating time of arc heaters.In this work,the arc ablation behaviors and mechanisms of commercial CuCr10,CuCr25,and CuCr50 cathodes were investigated for pure copper and pure chromium cathodes.The discharging homogeneity was improved with the increase of chromium content in the cathodes,which was attributed to the formed chromic oxide layer.The CuCr50 cathodes exhibited the lowest ablation rate with a reduction of 27.0%compared to the copper cathodes.The chromic oxide formed in the pit protected the bottom matrix,leading to a homogeneous ablation process.The mechanism for the improved homogeneous ablation behaviors of the CuCr50 cathodes was proposed and featured by the suppression of deep pits and the dispersion of arc foot.Future attention will be focused on designing composite cathodes with an anti-ablation surface layer and a good conductive matrix. | Weimian Guan Jie Yuan Hao Lv Tao Zhu Youtong Fang Jiabin Liu Hongtao Wang Zhihui Li Zhigong Tang Wei Yang | 2021 | Journal of Materials Science & Technology2021，，22： | 3 |
| 7 | The optimization of valve plate cross angle based on the pumping dynamics mode显示文摘 | Ma Jien Fang Youtong Xu Bing | 2010 | Journal of Zhejiang University : Science A2010，11，3： | 1 |
| 8 | Apoptotic caspases prevent the induction of type I interferons by mitochondrial DNA显示文摘 | Anthony Rongvaux Ruaidhrí Jackson Christian C.D. Harman Tuo Li A. Phillip West Marcel R. de Zoete Youtong Wu Brian Yordy Saquib A. Lakhani Chia-Yi Kuan Tadatsugu Taniguchi Gerald S. Shadel Zhijian J. Chen Akiko Iwasaki Richard A. Flavell | 2014 | Cell2014，，： | 1 |
| 9 | Subdomain Model for Predicting Armature Reaction Field of Dual-Stator Consequent-Pole PM Machines Accounting for Tooth-Tips显示文摘This paper presents an exact analytical subdomain model of dual-stator consequent-pole permanent-magnet(DSCPPM)machines accounting for tooth-tips,which can accurately predict the armature reaction field distribution in DSCPPM machines.In the proposed subdomain model,the field domain is composed of four types of sub-regions,viz.magnets,outer/inner air gaps,slots and slot openings.The analytical expressions of vector potential in each sub-region are determined by boundary and interface conditions.In comparison to the analytically predicted results,the corresponding flux density field distributions computed by finite element(FE)method are analyzed,which confirms the excellent accuracy of the developed subdomain model. | Minchen Zhu Lijian Wu Youtong Fang Thierry Lubin | 2019 | CES Transactions on Electrical Machines and Systems2019，3，2： | 1 |
| 10 | Optimization of Cross Angle Based on the Pumping Dynamics Model 显示文摘 | MA Jien FANG Youtong XU Bing | 2010 | Journal of Zhejiang University : Science A2010，11，3： | 1 |
| 11 | Dynamic Flow Control Strategies of Vehicle SCR Urea Dosing System显示文摘Selective Catalyst Reduction(SCR)Urea Dosing System(UDS)directly affects the system accuracy and the dynamic response performance of a vehicle.However,the UDS dynamic response is hard to keep up with the changes of the engine's operating conditions.That will lead to low NO_χconversion efficiency or NH_3 slip.In order to optimize the injection accuracy and the response speed of the UDS in dynamic conditions,an advanced control strategy based on an air-assisted volumetric UDS is presented.It covers the methods of flow compensation and switching working conditions.The strategy is authenticated on an UDS and tested in different dynamic conditions.The result shows that the control strategy discussed results in higher dynamic accuracy and faster dynamic response speed of UDS.The inject deviation range is improved from being between-8%and 10%to-4%and 2%and became more stable than before,and the dynamic response time was shortened from 200 ms to 150 ms.The ETC cycle result shows that after using the new strategy the NH_3 emission is reduced by 60%,and the NO_χemission remains almost unchanged.The trade-off between NO_χconversion efficiency and NH_3 slip is mitigated.The studied flow compensation and switching working conditions can improve the dynamic performance of the UDS significantly and make the UDS dynamic response keep up with the changes of the engine's operating conditions quickly. | LIN Wei ZHANG Youtong ASIF Malik | 2015 | Chinese Journal of Mechanical Engineering2015，28，2： | 1 |
| 12 | Two exact solutions of the DPL non-Fourier heat conduction equation with special conditions显示文摘This paper presents two exact explicit solutionsfor the three dimensional dual-phase lag(DLP)heat conduc-tion equation,during the derivation of which the method oftrial and error and the authors' previous experiences are uti-lized.To the authors' knowledge,most solutions of 2D or3D DPL models available in the literature are obtained bynumerical methods,and there are few exact solutions upto now.The exact solutions in this paper can be used asbenchmarks to validate numerical solutions and to developnumerical schemes,grid generation methods and so forth.In addition,they are of theoretical significance since theycorrespond to physically possible situations.The main goalof this paper is to obtain some possible exact explicit solu-tions of the dual-phase lag heat conduction equation as thebenchmark solutions for computational heat transfer,ratherthan specific solutions for some given initial and boundaryconditions.Therefore,the initial and boundary conditionsare indeterminate before derivation and can be deduced fromthe solutions afterwards.Actually,all solutions given in thispaper can be easily proven by substituting them into thegoverning equation. | Youtong Zhang Changsong Zheng Yongfeng Liu Liang Shao Chenhua Gou | 2009 | Acta Mechanica Sinica2009，25，2： | 1 |
| 13 | Difference in Unbalanced Magnetic Force of Fractional-Slot PM Machines between Internal and External Rotor Topologie显示文摘This paper presents a comparative investigation into unbalanced magnetic force(UMF)of asymmetric permanent magnet machines without rotor eccentricities,particularly focusing on the difference between internal-and external-rotor topologies.The asymmetric field distribution results in radial and tangential asymmetric force waves.Although the radial and tangential stresses are in different direction,the UMF components they produce are nearly aligned.The UMF from asymmetric radial force wave can be additive or subtractive to that from asymmetric tangential force wave.Investigation shows that for the same pole slot number combination,if the UMFs due to radial and tangential force waves are additive in internal rotor machine,they are subtractive in the external rotor counterpart,and vice versa.Investigation reveals a general rule determining whether additive or cancelling:for a UMF produced by any two field harmonics,they are additive if the higher order is produced by the outer part outside the airgap,but cancelling if the higher order is produced by the inner part.Therefore,for a machine with pole number 2p=3k+1,they are additive if it is an external-rotor machine,but otherwise subtractive.On the other hand,for a machine with pole number 2p=3k-1,they are subtractive if it is an external-rotor machine,but otherwise additive.For the UMF due to armature reaction only,they are subtractive for external-rotor machines,but otherwise additive.The investigation is carried out by an analytical model and validated by finite element analysis. | L.J.Wu Z.Q.Zhu Youtong Fang Xiaoyan Huang | 2017 | CES Transactions on Electrical Machines and Systems2017，1，2： | 0 |
| 14 | Noncanonical functions of microRNAs in the nucleus显示文摘MicroRNAs(miRNAs)are small noncoding RNAs(ncRNAs)that play their roles in the regulation of physiological and pathological processes.Originally,it was assumed that miRNAs only modulate gene expression post-transcriptionally in the cytoplasm by inducing target mRNA degradation.However,with further research,evidence shows that mature miRNAs also exist in the cell nucleus,where they can impact gene transcription and ncRNA maturation in several ways.This review provides an overview of novel models of nuclear miRNA functions.Some of the models remain to be verified by experimental evidence,and more details of the miRNA regulation network remaintobediscoveredinthefuture. | Jiayi Gu Yuanan Li Youtong Tian Yehao Zhang Yongjun Cheng Yuanjia Tang | 2024 | Acta Biochimica et Biophysica Sinica2024，56，2： | 0 |
| 15 | 基于预测电流控制的CIT400高速综合检测列车运行特性仿真分析方法显示文摘基于CIT400高速综合检测列车牵引传动系统的结构和牵引特性,运用MATLAB/Simulink软件建立预测电流控制下的高速综合检测列车牵引传动系统仿真模型,仿真分析列车在牵引和制动工况下受电弓短时断电及网压波动时的运行特性,并与实测数据进行对比分析。研究表明:仿真结果与实测数据基本一致,建立的仿真模型能正确反映列车的运行特性,能够满足列车实际运行的动静态要求。 | Fang, Youtong Liu, Li Ma, Jien Pei, Chunxing | 2012 | 中国铁道科学2012，，4： | 0 |
| 16 | Inhomogeneous ablation behaviors and failure mechanism of copper cathode in air显示文摘The copper cathode ablation limits the maximum power and operating time of arc heaters significantly.In this work,copper cathodes were tested in an ablation testing system to investigate the ablation behaviors and mechanism of copper cathode in air.The microstructure of the ablated cathodes was analyzed,and the ablation rate was measured.The maximum depth and ablation rate increased with the electronic discharge.The mean ablation rate was compared with the prediction by a thermophysical theoretical model.Many ablation pits formed in the ablated surface and evolved into crater-like structures with unexpected depth as the ablation time was prolonged.The presence of ablation pits and crater-like structures suggested an inhomogeneous ablation behavior of the copper cathode in air.The underlying mechanism is proposed to explain the ablation failure of copper cathode in the high-power arc heater.Future attention to improving the service life of copper cathode could be focused on the surface modification to reduce the ablation inhomogeneity. | GUAN WeiMian YUAN Jie WANG YongFeng ZHANG HuanYu LV Hao YANG Hong ZHU Tao FANG YouTong LIU JiaBin WANG HongTao YANG Wei | 2020 | Science China(Technological Sciences)2020，63，11： | 0 |
| 17 | Stick to the Basics显示文摘本文《抓紧基本功》是中山大学外文系王宗炎教授和钟祜同副教授为参加香港中文大学1984年8月召开的应用语言学研讨会而作。研讨会的目的,是讨论四个现代化对中国的英语和汉语教学工作提出的新任务。本文根据中山大学外文系英语专业几年来的经验,谈两个问题:(1)应该教什么样的英语?(2)用什么方法来教?关于第一个问题,作者认为一般说来,现阶段的英语专业应该培养英语通才而不是什么“专家”。中国是发展中国家,百废俱兴,各种学科、各门行业都需要英语人材,甚至要求一个人这两年干这一行,过两年干另一行。为了适应国家建设的需要,本科生的知识面不能过窄,应该力求掌握英语的基本知识和基本技能,并能在毕业后按工作需要向专门化发展。关于第二个问题,作者的意见与上海外国语学院章振邦同志的大致相同,认为不宜偏重什么“结构法”或“交际法”,而应该把两派的长处结合起来,使学生既熟悉英语的基本结构,又懂得如何活用。但是这只是一个原则,如何实施,还要不断地摸索和改进。作者注意到了近年来国外的语言教学理论和某些曾到过中国的外籍人士对中国英语教学工作的评论,感到对我们有启发作用,但是只能有选择地接受。不必专搞文学,但是文学书还是要读。不应该一味死背硬记,不求理解,不去活用,但是强记仍然是学习外语的重要方法。中国社会不是说英语的社会,把英语国家教第二语言的方法搬来中国,是没有多大效果的。中国人在中国得怎么教英语,这要自己在实践中摸索前进,才能逐步上升为理论。 | Wang Zongyan Zhong Youtong | 1984 | 外国语1984，7，6： | 0 |
| 18 | Real-time Locally Optimal Schedule for Electric Vehicle Load via Diversity-maximization NSGA-II显示文摘As distributed energy storage equipments, electric vehicles (EVs) have great potential for applications in power systems. Meanwhile, reasonable optimization of the charging time of EVs can reduce the users’ expense. Thus, the schedule of the EV load requires multi-objective optimization. A diversity-maximization non-dominated sorting genetic algorithm (DM-NSGA)-II is developed to perform multi-objective optimization by considering the power load profile, the users’charging cost, and battery degradation. Furthermore, a real-time locally optimal schedule is adopted by utilizing a flexible time scale. The case study illustrates that the proposed DM-NSGA-II can prevent being trapped in a relatively limited region so as to diversify the optimal results and provide trade-off solutions to decision makers. The simulation analysis shows that the variable time scale can continuously involve the present EVs in the real-time optimization rather than rely on the forecasting data. The schedule of the EV load is more practical without the loss of accuracy. | Hongqian Wei Jun Liang Chuanyue Li Youtong Zhang | 2021 | Journal of Modern Power Systems and Clean Energy2021，9，4： | 0 |
| 19 | Control of Hydraulic Power System by Mixed Neural Network PID in Unmanned Walking Platform显示文摘To speedily regulate and precisely control a hydraulic power system in a unmanned walking platform(UWP),based on the brief analysis of digital PID and its shortcomings,dual control parameters in a hydraulic power system are given for the precision requirement,and a control strategy for dual relative control parameters in the dual loop PID is put forward,a load and throttle rotation-speed response model for variable pump and gasoline engine is provided according to a physical process,a simplified neural network structure PID is introduced,and formed mixed neural network PID(MNN PID)to control rotation speed of engine and pressure of variable pump,calculation using the back propagation(BP)algorithm and a self-adapted learning step is made,including a mathematic principle and a calculation flow scheme,the BP algorithm of neural network PID is trained and the control effect of system is simulated in Matlab environment,real control effects of engine rotation speed and variable pump pressure are verified in the experimental bench.Results show that algorithm effect of MNN PID is stable and MNN PID can meet the adjusting requirement of control parameters. | Jun Wang Yanbin Liu Yi Jin Youtong Zhang | 2020 | Journal of Beijing Institute of Technology2020，29，3： | 0 |
| 20 | High-speed railway transport technology显示文摘1 Introduction The high-speed railway is one of the most active technological fields in China.Since the opening of the high-speed line between Beijing and Tianjin in 2008,China has built the world’s largest high-speed railway network with the highest average operating speed in the world(Bian et al.,2019;Cao et al.,2021;Chen et al.,2022).China has also created the world’s largest,most advanced,and comprehensive scientific research system and industrial chain in the field of high-speed railways.Currently,China’s high-speed railway oper‐ating mileage,the total number of research personnel related to high-speed railways,and the total research investment in them,all exceed the sum of those of all other countries. | Youtong FANG Jien MA | 2023 | Journal of Zhejiang University-Science A(Applied Physics & Engineering)2023，24，3： | 0 |
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