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Effect of Approaching Contact Speed of Hand-Held Metal Piece on Characteristics of discharge current from Charged Human Body

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Effect of Approaching Contact Speed of Hand-Held Metal Piece...

The Fourth Asia-Pacific Conference on Environmental Electromagnetics

作者： Osamu Fujiwara Graduate School Nagoya Institute of Technology Gokiso-cho Showa-kuNagoya466-8555Japan.

＜正＞Characteristic measurements of contact discharge currents were made through a hand-held metal piece from a charged human-body. Effects of approaching contact speeds on discharge current parameters, such as current peaks, peak current derivatives and spark length, were statistically examined with respect to correlation coefficients for various charge voltages.

关键词： electrostatic discharge hand-held metal piece discharge current contact approach speed statistical correlation.

Effect of Approaching Contact Speed of Hand-Held Metal Piece on Characteristics of discharge current from Charged Human Body

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Effect of Approaching Contact Speed of Hand-Held Metal Piece...

作者： Osamu Fujiwara Graduate School Nagoya Institute of Technology Gokiso-choShowa-kuNagoya466-8555Japan.

Characteristic measurements of contact discharge currents were made through a hand- held metal piece from a charged *** of approaching contact speeds on discharge current parameters,such as current peaks,peak current derivatives and spark length,were statisti- cally examined with respect to correlation coefficients for various charge voltages.

关键词： electrostatic discharge hand-held metal piece discharge current contact approach speed statistical correlation

THE INFLUENCE OF COAL DUST ON THE current OF CORONA discharge AT HIGH VOLTAGE ELECTRIC FIELD

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THE INFLUENCE OF COAL DUST ON THE CURRENT OF CORONA DISCHARG...

The 6th International Conference on Applied Electrostatics

作者： Shou Jie He Jian Ping Bai Qing Li Zhi Qiang Liu~* Yu Hong Han and Xiao Jun Feng Electrostatic Research Institute Hebei University Baoding 071002 China

＜正＞Using a negative tube-wire Electrostatic Precipitator（ESP）,the influences of concentration and diameter of coal dust particles on the discharge current are investigated when the gases are associated with coal dust flowing through the tube-wire *** results have been obtained as the follows:First,to the same type of coal dust,when the concentration is relatively low,the current increases compared with that in the absence of coal dust;when the concentration exceeds a particular value,the current falls compared with that in the absence of coal ***,to the same gases with a high concentration of coal dust,the decreasing value of current falls with the increase of coal dust ***,to the same gases with a low concentration of coal dust,the raise of current increases with the increasing of diameter of coal dust. The reasons about the phenomena mentioned above have been discussed.

关键词： Negative corona discharge ESP Diameter of particles Concentration discharge current

CORRELATION INVESTIGATION BETWEEN CONTACT APPROACH SPEED OF HANDHELD METAL ROD AND discharge PARAMETERS FROM CHARGED HUMAN BODY

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Journal of Electronics(China) 2008年第3期25卷 384-388页

作者： Ruan Fangming Fujiwara Osamu Gao Yougang Institute of Electromagnetic Compatibility Beijing University of Post ＆ Telecommunications Beijing 100876 China School of Physics ＆ Chemistry Guizhou NormaI University Guiyang 550001 China Graduate School of Engineering Nagoya Institute of Technology Gokiso-cho Showa-ku Nagoya 466-8555 Japan

Characteristic measurement of contact discharge currents are made through a hand-held metal rod from charged human body. Correlation coefficients are obtained, through Statistic Package for Social Science (SPSS), for various charge voltages, which is based on the effect test of electrode contact approach speeds on discharge current parameters of current peaks, maximum rising slope and spark lengths. discharge parameters at charge voltage 300V are independent on approach speed. For charge voltages equal to and higher than 500V, the contact approach speed has strong positive cor- relation with discharge parameters of the peak current and the maximum rising slope, whereas has strong negative correlation with the spark length.

关键词： ElectroStatic discharge (ESD) Metal rod discharge current Contact approach speed Statistical correlation

硅橡胶环氧树脂复合材料电痕的实验研究(英文)

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高电压技术 2011年第11期37卷 2780-2785页

作者： Abdul Syakur Hamzah Berahim Tumiran Rochmadi Department of Electrical Engineering Gadjah Mada UniversityYogyakarta 55281Indonesia Department of Chemical Engineering Gadjah Mada UniversityYogyakarta 55281Indonesia

The use of polymer materials as electrical insulators on transmission and distribution lines has been increasing such as epoxy *** advantages of using epoxy resin as an insulating material are its low density,better dielectric properties,and epoxy resin has higher volume resistivity than that of the glass and ***,epoxy resin has some disadvantages when it is used in tropical areas concerning with the humidity,high ultraviolet radiation, acid rain and effects of ***,insulator surface will be easily damaged due to electrical tracking,which is indicated by the surface *** this paper,the surface tracking on epoxy resin compound with silicon rubber has been *** test was done based on the method of Inclined-Planed Tracking(IPT) IEC 587:1984 with NH_4C1 as *** test materials used were epoxy resins based on Diglycidyl Ether of Bisphenol A(DGEBA) and Methaphenylene Diamine(MPDA) compound with silicon rubber(SiR) with the dimensions of 50 mm×120 mm and the thickness of 6 *** flow rate of contaminant was 0.3 mL/*** 3.5 kV AC high voltage 50 Hz was applied to the top *** experimental results show that the contact angle of hydrophobic was affected by compound of silicon *** surface tracking,time to tracking and discharge current were affected by applied voltage,contamination and contact *** using micro-cameras,the surface damage was detected. The severest damaged sample surface on a sample had small contact *** the other hand,samples with the greatest contact angle needed longer time to have surface damage in the surface *** shows that it is more difficult for large contact angle samples or more hydrophobic to have surface *** resin compound with silicon rubber has contact angle of hydrophobic greater than epoxy resin without silicon rubber.

关键词： epoxy resin silicon rubber tracking contact angle discharge current contaminant

SIMULATION STUDY ON CAPACITOR discharge PERCUSION WELDING

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Chinese Journal of Mechanical Engineering 1997年第4期10卷 56-59,81页

作者： Shan Ping Wang Xu Tianjin University

Based on the network theory, the discharge circuit model of capacitor discharge percussion welding machine is established. The discharge current waveform is calculated by means of simulation method. A thorough inquiry into the factors affecting the discharge current waveform is made by using orthogonal design method. Results show that the calculation results of the calculation program proposed well coincide with the actual experiment data.

关键词： Capacitor discharge percussion welding (CDPW) discharge current Simulation

Analysis of Fatigue and Microhardness in Metallic Powder Mixed EDM

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Open Journal of Applied Sciences 2020年第10期10卷 613-624页

作者： Alexis Mouangué Nanimina Nandiguim Lamaï Djimako Bongo Togdjim Jonas Bonaventure Danoumbé Ahmad Majdi Abdul-Rani Mechanical Engineering Department Higher National Institute of Sciences and Techniques of Abéché (INSTA) Abéché Ouaddai Chad Higher Normal School of Technology of Sarh Moyen-Chari Chad Mechanical Engineering Department Universiti Teknologi PETRONAS (UTP) Perak Darul Ridzuan Malaysia

The objective of this work research is to investigate the potential of using metallic powder mixed with electrical discharge machining (EDM) dielectric when machining hard electrically conductive materials. Nowadays, the development of industries requires hard materials for various applications. Machining the hard materials using the traditional processes lead to tool break and poor machined product. Even when the conventional EDM can machine hard material as long as it is electrically conductive materials, the machined parts still present drawbacks. Metallic powder mixed with EDM dielectric (PMEDM) was hypothesized to improve the machined part. The presence of metallic powder ensures uniform distribution of spark and the electrical density of the spark decreases which reduces craters, cracks and voids on machined surface. The transfer and deposit of alloying elements during powder mixed electrical discharge machining improve the machined surface properties particularly micro-hardness and fatigue. Discharge current (IP), gap voltage (GapV), ON-time (ON) and aluminum powder are selected as machined variable parameters and the output responses are fatigue performance, micro-hardness and surface topography. The workpiece material selected is molybdenum high speed steel. Micro-hardness was determined using micro-hardness tester device. The fatigue performance was determined using empirical equation. Analysis of material transfer was done using energy dispersive spectroscopy (EDS) attached to FESEM. EDS analysis involves the generation of an X-ray spectrum from the entire scan area of the SEM. The use of PMEDM improved the fatigue, the micro-harnes

关键词： PMEDM Fatigue Micro-Hardness discharge current Gap Voltage ON-Time