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IEEE International Conference on Plasma Science (ICOPS)

作者： X. Liu D. Liu State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan Hubei China

A numerical and experimental study of plasma jet propagation in low temperature, atmospheric-pressure, helium jet in ambient air is presented. A self-consistent, multi-species, two-dimensional axially symmetric plasma model with detailed finite-rate chemistry of helium-air mixture composition is used to provide insights into the propagation of the plasma jet. The obtained simulation results suggest the sheath forms near the dielectric tube inner surface and shields the plasma channel from the tube surface. The strong electric field at the edge of dielectric field enhances the ionization in the air mixing layer, therefore the streamer head changes into the ring shape when the streamer runs out of the tube. The avalanche to streamer transition is the main mechanism of the streamer advancement. Penning ionization dominated the ionization reactions and increased the electric conductivity of plasma channel. The simulation results are supported by the experiment observations with the similar discharge conditions.

关键词： Electron tubes Ionization Atmospheric modeling Simulation Dielectrics Atmospheric-pressure plasmas

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Fault identification method based on the neutral point medium resistance switching-on for the distribution network

Fault identification method based on the neutral point mediu...

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IEEE PES Asia-Pacific Power and Energy engineering Conference (APPEEC)

作者： Ning Tong Xiangning Lin Rui Zhang Shan He Zhengtian Li State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology (HUST) Wuhan China

ISBN: (纸本)9781479975389

It has long been a hot issue of the single-phase to ground fault identification technics for the distribution network with neutral un-grounded system (NUS), the neutral resonant grounded system (NES) and the neutral resistor grounded system (NRS). The fault detection and location could be very difficult since the faulted component in above scenarios is less pronounced, and meanwhile it becomes a less helpful by using conventional scheme if the arc suppression coil is equipped. In this paper, a novel method based on the neutral point medium resistance switching-on is introduced, and the faulted component of the lines in the distribution network is analyzed. By the comparison between the variations of the faulted phase-current before and after the medium resistance switching-on, the faulted location can thus be determined. Simulation results indicate that in most cases, the proposed method show great reliability and immune to the changes of the system conditions.

关键词： Resistance Switches Coils Fault diagnosis Grounding Circuit faults

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A battery-operated atmospheric-pressure plasma wand for biomedical applications

A battery-operated atmospheric-pressure plasma wand for biom...

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IEEE International Conference on Plasma Science (ICOPS)

作者： XinPei Lu XueKai Pei State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan Hubei China

ISBN: (纸本)9781479927142

In the past decade room-temperature atmospheric pressure plasma jets (RT-APPJs) have attracted a lot of attention due to their applications in the field of health care and medicine, including bacteria inactivation, blood coagulation, wound healing, teeth whitening, and tooth root canal treatment. To fulfill the specific requirements of various applications, many different types of RT-APPJs with different designs and driven by different power sources, including kHz AC, RF, microwave, pulsed DC and DC voltages, have been developed. On the other hand, external power sources (e.g., wall power or power generator) are needed for all these devices. In addition, most of these devices also need gas supply (e.g., He, Ar). Furthermore, for applications where bacteria, fungi, or viruses are hidden in narrow channels such as nasal cavity and ear canal, most of the currently available devices are not suitable for such situations. In this paper, a handheld, battery operated atmospheric pressure plasma rod (named plasma wand) which does not rely on external power source (e.g., wall power or power generator) and gas supply is reported. The plasma wand can be used for killing bacteria, fungi, or viruses that are hidden in narrow channels such as nasal cavity and ear canal, which are difficult to access using most of currently available devices. Besides, the electrical characterization, plasma wand temperature, emission spectra of the plasma, ozone and OH radical concentration generated by the device, are investigated by different diagnostic methods. The ozone concentration reaches 120 ppm at 1 mm away from the device and the OH concentration reaches 3.5×10 14 cm -3 in the plasma. The preliminary bacteria inactivation experiment results show that all bacteria samples on the microfiltration membrane are killed by this device within 30 s.

关键词： Plasmas Microorganisms Irrigation Medical services Generators Fungi Viruses (medical)

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A novel modular multistage axial-flux permanent magnet machine for electric vehicles

A novel modular multistage axial-flux permanent magnet machi...

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International Conference on Electrical Machines and Systems (ICEMS)

作者： Hongqin Xie Xubiao Wei Kai Yang State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan Hubei China

ISBN: (纸本)9781479951635

In this paper a novel modular multistage axial-flux permanent magnet machine (MM-AFPMs) is proposed for the drive machine applications in electric vehicles (EVs), which has the features of slotted north-south-pole (NS) topology, segmented and yokeless stator, ellipsoidal similar Somaloy teeth, flexible power and switch circuits. As the most concerned properties in EVs, the excellent speed-extension capability and cogging torque minimization of the new machine are discussed at great length. Both theoretical analysis and finite-element method (FEM) are used to optimize the design of the new machine. Based on a 2kW-1000rpm 10-pole 12-open-slot prototype, the experiments are developed. The results measured by experiments agree well with the ones predicated by 3D FEM, which verifies the conclusions and design.

关键词： Windings Switching circuits Stator windings Torque Finite element analysis Forging

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Research on Branches Group Based Method for Adding Mutual Inductance Branches to Y-Matrix and Z-Matrix

Research on Branches Group Based Method for Adding Mutual In...

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IEEE Power and Energy Society General Meeting

作者： Ming Chen Dongyuan Shi Yinhong Li Lin Zhu Huanzhang Liu State Key Laboratory of Advanced Electromagnetic Engineering and Technology HuaZhong University of Science and Technology Wuhan University of Hydraulic and Electrical Engineering

ISBN: (纸本)9781479964161

In the process of constructing Y-matrix and Z-matrix by traditional method of adding branches, the additional of mutual inductance line is more complex than non-mutual inductance line. A novel algorithm of constructing Y-matrix and Z-matrix based on branches group is put forward in this paper. The algorithm can unify the calculation method of mutual inductance branches and non-mutual inductance branches efficiently. The calculation amount of adding mutual inductance branches is reduced to as same as that of non-mutual inductance branches. Case studies show that the computing method based on the algorithm provided by this paper is simple and unified, reduces the amount of computation and improves the computational efficiency.

关键词： Electric power system Mutual inductance branches Branches group Y-matrix Z-matrix

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Experimental study of electron beam welded QCr0.8 bronze joint

Experimental study of electron beam welded QCr0.8 bronze joi...

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2013 3rd International Conference on Chemical, Metallurgical engineering, ICCMME 2013

作者： Ting, Wang Wang, Hou Qin Zhang, Bing Gang Zhong, Shi Sheng Feng, Ji Cai Shandong Provincial Key Lab of Special Welding Technology Harbin Institute of Technology at Weihai 264209 China State Key Lab of Advanced Welding and Joining Harbin Institute of Technology Harbin 150001 China School of Mechatronics Engineering Harbin Institute of Technology Harbin 150001 China

ISBN: (纸本)9783037859940

The butt welding test has been performed on QCr0.8 bronze by electron beam welding. Microstructure of the joint was examined by optical microscopy and scanning electron microscopy with EDS. Microhardness of the joint was determined to evaluate the mechanical property of the joint. The fusion zone and the heat affected zone became the weak area of the joint due to the growth of grains and the redissolve of strengthening phase. The decrease of strengthening phase has a major influence on the microhardness reduction of the joint. © (2014) Trans Tech Publications, Switzerland.

关键词： Bronze

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Avalanche dynamics of granular materials under the slumping regime in a rotating drum as revealed by speckle visibility spectroscopy

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Physical Review E 2015年第4期91卷 042206-042206页

作者： H. Yang R. Li P. Kong Q. C. Sun M. J. Biggs V. Zivkovic School of Optical-Electrical and Computer Engineering Shanghai Key Lab of Modern Optical System and Engineering Research Center of Optical Instrument and System Ministry of Education University of Shanghai for Science and Technology Shanghai 200093 China School of Chemical Engineering The University of Adelaide SA 5005 Australia Foundation department Shanghai Medical Instrumentation College Shanghai 200093 China State Key Laboratory for Hydroscience and Engineering Tsinghua University Beijing 100084 China School of Science Loughborough University LE11 3TU United Kingdom School of Chemical Engineering and Advanced Materials Newcastle University NE1 7RU United Kingdom

We used speckle visibility spectroscopy to measure the time-resolved dynamcis of avalanching down the inclined surface of a granular material in a half-full rotating drum operating in the slumping regime. The distribution of the avalanche period, td, rest time between them, tr, and peak particle velocity fluctuation, δvp2, are all normally distributed. While the distributions of the two times at the top and bottom of the free surface are very similar, the particle velocity fluctuation is greater at the bottom of the free surface than at the top. The rest time is observed to be inversely related to the drum speed. Combining this with the relation of tr and the difference of the upper and lower angle of repose for the granular material, Δθ, we find that the latter decreases linearly with increasing rotational speed. We also observe that td increases in a linear fashion with the drum speed. Using the relation of tr and the distance that particles have to move during an avalanche, we further find that a new scaling relation of the mean number of avalanches required to traverse the free surface with drum speed. We find that the slumping frequency increases with the rotating speed before becoming constant in the slumping-to-rolling transition region. Finally, we find that the average peak of the fluctuation speed of the avalanche, δvp2, increases linearly with the drum speed.

关键词： GRANULAR materials RESEARCH ELECTRON avalanches OPTICAL spectroscopy FLUCTUATIONS (Physics) VELOCITY DRUMS (Containers)

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Novel bistable PM electromagnetic clutch unit for wheel EV drive

Novel bistable PM electromagnetic clutch unit for wheel EV d...

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International Conference on Electrical Machines and Systems (ICEMS)

作者： Wanli Cai Chenglin Gu Chenhui Wang State Key Laboratory of Advanced Electromagnetic Engineering and Tecnology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9781479951635

A novel bistable permanent magnet electromagnetic clutch (BPMEC) unit is introduced into wheel drive so as to turn rigid connection between hub and motor into flexible form, thus remit mechanical and electromagnetic impulsion. Working principle of this idea is conceptually demonstrated. electromagnetic relations of the BPMEC unit are presented, as well as performance calculated and verified by experiments measured on a prototype. Finally, general design principles are investigated in detail by studying leakage coefficient which is obtained from analytical solution.

关键词： Force Steady-state Wheels electromagnetics Permanent magnet motors Coils Magnetic circuits

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Slip frequency correction method for indirect vector control system considering parameters deviation

Slip frequency correction method for indirect vector control...

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International Conference on Electrical Machines and Systems (ICEMS)

作者： Mengyu Ding Chenglin Gu State Key Laboratory of Advanced Electromagnetic Engineering and Tecnology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9781479951635

Induction machine with indirect vector control system has advantages of simple structure and high performance. But under the condition of parameters deviation, both steady-state and transient performance of this system are influenced. The succeeding section of this paper analyses the effect of parameters deviation for indirect vector control system. Then a slip frequency correction method is proposed in the following section to minimize error of rotor flux position and improve the system's robustness to parameters changing. The results of this paper give some reference to the design of indirect vector control system with considering parameters deviation.

关键词： Rotors Mathematical model Torque Resistance Equations Machine vector control Stators

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Magnetic field analysis and optimal design of a novel bistable permanent electromagnetic clutch

Magnetic field analysis and optimal design of a novel bistab...

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International Conference on Electrical Machines and Systems (ICEMS)

作者： Fan Yang Chenglin Gu Chenhui Wang State Key Laboratory of Advanced Electromagnetic Engineering and Tecnology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9781479951635

A novel bistable permanent electromagnetic clutch (BPMEC) unit is proposed which can be used in electric vehicles to fulfill flexible connect the motor and hubs. The magnetic field distribution of the clutch is predicted by using finite element method and magnetic circuit method. Subsequently, the main sizes are optimized by investigating flux leakage coefficient, and micro-topology of BPMEC is optimized by investigating magnetizing current.

关键词： Magnetic flux leakage Solid modeling Coils Magnetic fields Magnetic domains electromagnetics Magnetic circuits

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