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131 results on '"Yuan, Weiqun"'

1. Numerical Calculation of Contact Resistance of Electromagnetic Railgun

Author

Shao, Kairan, Yuan, Weiqun, Yan, Ping, Angrisani, Leopoldo, Series Editor, Arteaga, Marco, Series Editor, Chakraborty, Samarjit, Series Editor, Chen, Jiming, Series Editor, Chen, Shanben, Series Editor, Chen, Tan Kay, Series Editor, Dillmann, Rüdiger, Series Editor, Duan, Haibin, Series Editor, Ferrari, Gianluigi, Series Editor, Ferre, Manuel, Series Editor, Jabbari, Faryar, Series Editor, Jia, Limin, Series Editor, Kacprzyk, Janusz, Series Editor, Khamis, Alaa, Series Editor, Kroeger, Torsten, Series Editor, Li, Yong, Series Editor, Liang, Qilian, Series Editor, Martín, Ferran, Series Editor, Ming, Tan Cher, Series Editor, Minker, Wolfgang, Series Editor, Misra, Pradeep, Series Editor, Mukhopadhyay, Subhas, Series Editor, Ning, Cun-Zheng, Series Editor, Nishida, Toyoaki, Series Editor, Oneto, Luca, Series Editor, Panigrahi, Bijaya Ketan, Series Editor, Pascucci, Federica, Series Editor, Qin, Yong, Series Editor, Seng, Gan Woon, Series Editor, Speidel, Joachim, Series Editor, Veiga, Germano, Series Editor, Wu, Haitao, Series Editor, Zamboni, Walter, Series Editor, Tan, Kay Chen, Series Editor, Yang, Qingxin, editor, Li, Zewen, editor, and Luo, An, editor

Published
2024
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3. Analysis of Sliding Contact of Armature Inside the Horizontal Curved Rails in Electromagnetic Railgun

Author

Che, Yunlong, Yuan, Weiqun, Hao, Wei, Wang, Zhizeng, Zhao, Ying, Yan, Ping, Angrisani, Leopoldo, Series Editor, Arteaga, Marco, Series Editor, Panigrahi, Bijaya Ketan, Series Editor, Chakraborty, Samarjit, Series Editor, Chen, Jiming, Series Editor, Chen, Shanben, Series Editor, Chen, Tan Kay, Series Editor, Dillmann, Rüdiger, Series Editor, Duan, Haibin, Series Editor, Ferrari, Gianluigi, Series Editor, Ferre, Manuel, Series Editor, Hirche, Sandra, Series Editor, Jabbari, Faryar, Series Editor, Jia, Limin, Series Editor, Kacprzyk, Janusz, Series Editor, Khamis, Alaa, Series Editor, Kroeger, Torsten, Series Editor, Li, Yong, Series Editor, Liang, Qilian, Series Editor, Martín, Ferran, Series Editor, Ming, Tan Cher, Series Editor, Minker, Wolfgang, Series Editor, Misra, Pradeep, Series Editor, Möller, Sebastian, Series Editor, Mukhopadhyay, Subhas, Series Editor, Ning, Cun-Zheng, Series Editor, Nishida, Toyoaki, Series Editor, Oneto, Luca, Series Editor, Pascucci, Federica, Series Editor, Qin, Yong, Series Editor, Seng, Gan Woon, Series Editor, Speidel, Joachim, Series Editor, Veiga, Germano, Series Editor, Wu, Haitao, Series Editor, Zamboni, Walter, Series Editor, Zhang, Junjie James, Series Editor, Li, Jian, editor, Xie, Kaigui, editor, Hu, Jianlin, editor, and Yang, Qingxin, editor

Published
2023
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4. Research Progress on the Optimization of the Inner Bore Cross-Section Shape of the Railgun

Author

Xiao, Nan, Li, Jun, Yuan, Weiqun, Yan, Ping, Angrisani, Leopoldo, Series Editor, Arteaga, Marco, Series Editor, Panigrahi, Bijaya Ketan, Series Editor, Chakraborty, Samarjit, Series Editor, Chen, Jiming, Series Editor, Chen, Shanben, Series Editor, Chen, Tan Kay, Series Editor, Dillmann, Rüdiger, Series Editor, Duan, Haibin, Series Editor, Ferrari, Gianluigi, Series Editor, Ferre, Manuel, Series Editor, Hirche, Sandra, Series Editor, Jabbari, Faryar, Series Editor, Jia, Limin, Series Editor, Kacprzyk, Janusz, Series Editor, Khamis, Alaa, Series Editor, Kroeger, Torsten, Series Editor, Li, Yong, Series Editor, Liang, Qilian, Series Editor, Martín, Ferran, Series Editor, Ming, Tan Cher, Series Editor, Minker, Wolfgang, Series Editor, Misra, Pradeep, Series Editor, Möller, Sebastian, Series Editor, Mukhopadhyay, Subhas, Series Editor, Ning, Cun-Zheng, Series Editor, Nishida, Toyoaki, Series Editor, Oneto, Luca, Series Editor, Pascucci, Federica, Series Editor, Qin, Yong, Series Editor, Seng, Gan Woon, Series Editor, Speidel, Joachim, Series Editor, Veiga, Germano, Series Editor, Wu, Haitao, Series Editor, Zamboni, Walter, Series Editor, Zhang, Junjie James, Series Editor, Xie, Kaigui, editor, Hu, Jianlin, editor, Yang, Qingxin, editor, and Li, Jian, editor

Published
2023
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5. Experimental and Simulation Study of Deposition Layer on Rails in the Startup Stage of Armatures

Author

Tian, Wen, Wang, Gongwei, Yuan, Weiqun, Zhao, Ying, Yan, Ping, Angrisani, Leopoldo, Series Editor, Arteaga, Marco, Series Editor, Panigrahi, Bijaya Ketan, Series Editor, Chakraborty, Samarjit, Series Editor, Chen, Jiming, Series Editor, Chen, Shanben, Series Editor, Chen, Tan Kay, Series Editor, Dillmann, Rüdiger, Series Editor, Duan, Haibin, Series Editor, Ferrari, Gianluigi, Series Editor, Ferre, Manuel, Series Editor, Hirche, Sandra, Series Editor, Jabbari, Faryar, Series Editor, Jia, Limin, Series Editor, Kacprzyk, Janusz, Series Editor, Khamis, Alaa, Series Editor, Kroeger, Torsten, Series Editor, Li, Yong, Series Editor, Liang, Qilian, Series Editor, Martín, Ferran, Series Editor, Ming, Tan Cher, Series Editor, Minker, Wolfgang, Series Editor, Misra, Pradeep, Series Editor, Möller, Sebastian, Series Editor, Mukhopadhyay, Subhas, Series Editor, Ning, Cun-Zheng, Series Editor, Nishida, Toyoaki, Series Editor, Oneto, Luca, Series Editor, Pascucci, Federica, Series Editor, Qin, Yong, Series Editor, Seng, Gan Woon, Series Editor, Speidel, Joachim, Series Editor, Veiga, Germano, Series Editor, Wu, Haitao, Series Editor, Zamboni, Walter, Series Editor, Zhang, Junjie James, Series Editor, Xie, Kaigui, editor, Hu, Jianlin, editor, Yang, Qingxin, editor, and Li, Jian, editor

Published
2023
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6. Effects of Rail Shape on Recoil of Electromagnetic Energy Equipment

Author

Li, Guochao, Yuan, Weiqun, Tian, Wen, Miao, Chen, Zhao, Weikang, Zhao, Ying, Yan, Ping, Angrisani, Leopoldo, Series Editor, Arteaga, Marco, Series Editor, Panigrahi, Bijaya Ketan, Series Editor, Chakraborty, Samarjit, Series Editor, Chen, Jiming, Series Editor, Chen, Shanben, Series Editor, Chen, Tan Kay, Series Editor, Dillmann, Rüdiger, Series Editor, Duan, Haibin, Series Editor, Ferrari, Gianluigi, Series Editor, Ferre, Manuel, Series Editor, Hirche, Sandra, Series Editor, Jabbari, Faryar, Series Editor, Jia, Limin, Series Editor, Kacprzyk, Janusz, Series Editor, Khamis, Alaa, Series Editor, Kroeger, Torsten, Series Editor, Li, Yong, Series Editor, Liang, Qilian, Series Editor, Martín, Ferran, Series Editor, Ming, Tan Cher, Series Editor, Minker, Wolfgang, Series Editor, Misra, Pradeep, Series Editor, Möller, Sebastian, Series Editor, Mukhopadhyay, Subhas, Series Editor, Ning, Cun-Zheng, Series Editor, Nishida, Toyoaki, Series Editor, Oneto, Luca, Series Editor, Pascucci, Federica, Series Editor, Qin, Yong, Series Editor, Seng, Gan Woon, Series Editor, Speidel, Joachim, Series Editor, Veiga, Germano, Series Editor, Wu, Haitao, Series Editor, Zamboni, Walter, Series Editor, Zhang, Junjie James, Series Editor, Yang, Qingxin, editor, Liang, Xidong, editor, Li, Yaohua, editor, and He, Jinghan, editor

Published
2022
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7. Simulation and Experimental Study on Muzzle Flow Field of Electromagnetic Energy Equipment

Author

Miao, Chen, Zhao, Ying, Tian, Wen, Li, Guochao, Zhao, Weikang, Yuan, Weiqun, Yan, Ping, Angrisani, Leopoldo, Series Editor, Arteaga, Marco, Series Editor, Panigrahi, Bijaya Ketan, Series Editor, Chakraborty, Samarjit, Series Editor, Chen, Jiming, Series Editor, Chen, Shanben, Series Editor, Chen, Tan Kay, Series Editor, Dillmann, Rüdiger, Series Editor, Duan, Haibin, Series Editor, Ferrari, Gianluigi, Series Editor, Ferre, Manuel, Series Editor, Hirche, Sandra, Series Editor, Jabbari, Faryar, Series Editor, Jia, Limin, Series Editor, Kacprzyk, Janusz, Series Editor, Khamis, Alaa, Series Editor, Kroeger, Torsten, Series Editor, Li, Yong, Series Editor, Liang, Qilian, Series Editor, Martín, Ferran, Series Editor, Ming, Tan Cher, Series Editor, Minker, Wolfgang, Series Editor, Misra, Pradeep, Series Editor, Möller, Sebastian, Series Editor, Mukhopadhyay, Subhas, Series Editor, Ning, Cun-Zheng, Series Editor, Nishida, Toyoaki, Series Editor, Oneto, Luca, Series Editor, Pascucci, Federica, Series Editor, Qin, Yong, Series Editor, Seng, Gan Woon, Series Editor, Speidel, Joachim, Series Editor, Veiga, Germano, Series Editor, Wu, Haitao, Series Editor, Zamboni, Walter, Series Editor, Zhang, Junjie James, Series Editor, Yang, Qingxin, editor, Liang, Xidong, editor, Li, Yaohua, editor, and He, Jinghan, editor

Published
2022
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9. Influence of Magnitude of Armature Interference on Static Contact Resistance

Author

Wang, Zengji, Chen, Lixue, Cheng, Wenping, Yuan, Weiqun, Xu, Weidong, and Yan, Ping

Abstract

This article establishes a simulation model and a measurement experimental platform for static armature-rail interface contact resistance. By comparing simulation and experimental measurement results of different magnitudes of interference, the applicability of the Cooper-Mikic-Yovanovich (CMY) contact resistance calculation method in the assembly phase of railguns is validated. Subsequently, the relationship between the magnitude of interference and contact resistance is investigated. The results suggest that a moderate increase in the magnitude of interference leads to a decrease in contact resistance and an increase in robustness to assembly variations. The analysis of the components of contact resistance is conducted, which reveals that contact spots and uneven contact pressures jointly contribute to the increase/decrease of contact resistance. The current concentrating at the edges of the spots at the microscopic level leads to contact resistance. Additionally, at the macroscopic level, the current concentrating in regions with higher contact pressure results in contact resistance. According to the research, the increase in magnitude of interference can reduce the amount of both sources of contact resistance.

Published
2024
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15. Recent pseudo-liquid armature experiments with details of the test systems

Author

Li, Jun, Liu, Peizhu, Gui, Yingchun, Yu, Chenda, Hao, Zhonghu, Yao, Fenglin, Yan, Ping, Sun, Yaohong, Yuan, Weiqun, He, Junjia, and Xia, Shengguo

Subjects
Armatures -- Analysis, Business, Electronics, Electronics and electrical industries
Abstract

The Pseudo-liquid (PSL) armature with air-spring is a novel railgun armature, which has lower mass and more compliance than conventional C-shaped armature. The united research group leaded by Beijing Institute of Special Electromechauical Technology (BISET) has completed a lot of experiments of the PSL armatures with air-spring since 2004. The results of these experiments show this armature can prevent transition with some conditions. This paper presents an overview of PSL armature program including the pulsed power supply, two rail launchers (SRL1 and SRL3), projectiles and some experimental results. As the best result of SRL1 rail launcher tests, it is obtained that muzzle velocity of 1.1 km/s with a 52 g mass. The best performance of SRL3 launcher tests is muzzle velocity of 1.92 km/s with a 45 g mass operating at a stored energy of 1.39 MJ and a flat-top current of 400 kA with about 1.5 ms pulse duration. The further experimental studies are being continued. Index Terms--PSL armature, pulsed power supply, rail launcher, transition.

Published
2009

16. Experimental investigation of surface flashover in vacuum using nanosecond pulses

Author

Yan, Ping, Shao, Tao, Wang, Jue, Gao, Wei, Yuan, Weiqun, Pan, Ruzheng, Zhang, Shichang, and Sun, Guangsheng

Subjects
Dielectrics -- Usage, Dielectrics -- Properties, Vacuum -- Electric properties, Vacuum -- Research, Pulsed radiation -- Usage, Pulsed radiation -- Research, Business, Electronics, Electronics and electrical industries
Abstract

Based on a Marx generator and a coaxial pulse forming line, an experimental investigation of surface flashover characteristics in vacuum is conducted by using nanosecond pulses of 10 ns rise time and 30 ns full width at half maximum (FWHM). Insulator dielectrics chosen for this investigation are Teflon, PMMA and Nylon. The tested factors include gas pressure, cone angle of conical frustum, diameter and length of cylindrical insulator, material and shape of electrode, and contact style between insulator and electrodes. The effects of these parameters on the surface flashover characteristics are described and analyzed in this paper. In addition, the character of flashover time lag in the nanosecond range, and surface flashover theory in vacuum charged by nanosecond pulses are also discussed. Index Terms--Surface flashover, vacuum, nanosecond pulse, cathode triple junction, electron emission.

Published
2007

19. Design of a 3-m-long electromagnetic launcher

Author

Sun, Yaohong, Yan, Ping, Yuan, Weiqun, Li, Jun, Gui, Yingchun, Lv, Aimin, and Nie, Jianxin

Subjects
Armatures -- Analysis, Electromagnetic fields -- Research, Business, Electronics, Electronics and electrical industries
Abstract

A 3-m-long 30-mm square bore launcher has been constructed for electromagnetic launch application at the Institute of Electrical Engineering, Chinese Academy of Sciences. The main purpose of the launcher is to conduct the basic and applied research in electromagnetic launch. An optimum structure of the insulators was adopted through the stress analysis using the software ANSYS. In order to know about the variation of the gap under a certain stress, an air pressure piston (maximum air pressure of 5 MPa) and a position sensitive detector were adopted. The measuring results have shown that the rail gap decreases gradually from breech to muzzle; this kind of design can abate the erosion of the rails caused by arc discharge effectively. A total of 85 tests has been performed, including 17 tests of single-module discharging and 68 tests of nine-module sequential discharging, and a highest muzzle velocity of 1.9 km/s with a 45-g mass was achieved, operating at a current of 410 kA and 2-ms pulse duration. This launcher is now used for the fundamental research on armature structure, performance of the pulsed power supply, and the diagnostic system. A novel launcher based on the previous experimental results is under development. Index Terms--Armature, insulators, rail, stress analysis.

Published
2009

22. Dynamic Performances of the Electromagnetic Rail Launcher

Author

Cheng Wenping, Xie Keyu, Yan Ping, Wang Xianbin, Li Mancheng, Yuan Weiqun, Xu Rong, and Zhao Ying

Subjects
Physics, Nuclear and High Energy Physics, business.industry, Electrical engineering, Mechanical engineering, Physics::Classical Physics, Condensed Matter Physics, law.invention, Inductance, Railgun, law, Physics::Space Physics, business, Armature (electrical engineering)
Abstract

To obtain a rail-type electromagnetic launcher with large electrodynamic force, low temperature rise, and high structure strength, this paper investigates the performance of a pulsed current electromagnetic rail launcher (EMRL). According to the investigation, the inductance gradient and current-carrying capacity are determined. Based on the analysis of mechanical properties of the EMRL, armature, and bolt, the corresponding conclusions are achieved. These conclusions will establish the foundation for further research on the mechanism of the rail-type electromagnetic launcher.

Published
2015

25. Sliding electrical contact performance of electromagnetic

Author

严萍 Yan Ping, 杨丹 Yang Dan, 戴艺波 Dai Yibo, 李军 Li Jun, 陈允 Chen Yun, 徐伟东 Xu Weidong, 周媛 Zhou Yuan, and 袁伟群 Yuan Weiqun

Subjects
Materials science, Electrical and Electronic Engineering, Composite material, Atomic and Molecular Physics, and Optics, Electrical contacts
Published
2012

26. Design and experiment of tail structure of armature with high velocity

Author

严萍 Yan Ping, 陈允 Chen Yun, 李敏堂 Li Mintang, 王凤忠 Wang Fengzhong, 徐伟东 Xu Weidong, 袁伟群 Yuan Weiqun, and 潘如政 Pan Ruzheng

Subjects
Physics, law, High velocity, Mechanics, Electrical and Electronic Engineering, Tail structure, Atomic and Molecular Physics, and Optics, Armature (electrical engineering), law.invention
Published
2012

28. Experimental study of sliding electrical contacts in a multi-shot railgun

Author

刘传谱 Liu Chuanpu, 严萍 Yan Ping, 袁伟群 Yuan Weiqun, 孙鹞鸿 Sun Yaohong, and 孙连华 Sun Lianhua

Subjects
Railgun, Materials science, Shot (pellet), Acoustics, Electrical and Electronic Engineering, Atomic and Molecular Physics, and Optics, Electrical contacts
Published
2010

29. Numerical simulation and experiment of high-intensity current pulsed impact on structure body

Author

孙鹞鸿 Sun Yaohong, 袁伟群 Yuan Weiqun, 孙连华 Sun Lianhua, 严萍 Yan Ping, 邵涛 Shao Tao, 李敏堂 Li Mintang, and 刘传谱 Liu Chuanpu

Subjects
Physics, Computer simulation, High intensity, Structure (category theory), Electrical and Electronic Engineering, Current (fluid), Atomic and Molecular Physics, and Optics, Computational physics
Published
2010

36. An experimental investigation of repetitive nanosecond-pulse breakdown in air

Author

Yuan Weiqun, Yan Ping, Zhang Shi-chang, Sun Yaohong, Sun Guang-sheng, Wang Jue, and Shao Tao

Subjects
Pulse repetition frequency, Acoustics and Ultrasonics, Pulse (signal processing), business.industry, Chemistry, Analytical chemistry, Time lag, Nanosecond, Nanosecond pulse, Condensed Matter Physics, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, Ion, Pulse voltage, Optoelectronics, business, Pulsed power system
Abstract

A compact, repetitive pulsed power system has many applications, but some basic aspects of the breakdown characteristics need further investigation. The purpose of this paper is to investigate the breakdown characteristics of dry air with repetitive nanosecond pulses. The variables affecting the discharge conditions, including the applied pulse voltage, pulse repetition frequency, gap distance and gas pressure, are investigated. The relationship between the breakdown time lag, the repetitive stressing time, and the number of applied pulses to breakdown with pulse repetition rate, E-field strength and pressure are obtained, and the breakdown characteristics and mechanism are also discussed. It is suggested that activated neutral species and residual ions should be taken into account, and repetitive nanosecond-pulse breakdown is characterized by the accumulation effect.

Published
2006

37. Characteristics of high pulsed current electromagnetic rail launcher

Author

Wang Xianbin, Xie Keyu, Li Mancheng, Cheng Wenping, Zhao Ying, Yan Ping, Xu Rong, and Yuan Weiqun

Subjects
Inductance, Engineering, business.industry, law, Computer Science::Neural and Evolutionary Computation, Physics::Space Physics, Astrophysics::Instrumentation and Methods for Astrophysics, Mechanical engineering, Physics::Classical Physics, business, Computer Science::Other, Armature (electrical engineering), law.invention
Abstract

To obtain large electrodynamic force, low temperature rise and high structure strength rail-type electromagnetic launcher, this paper investigates the performance of pulsed current electromagnetic rail launcher. According to the investigation, the inductance gradient and current-carrying capacity is determined. Based on the analysis of mechanical properties of electromagnetic rail launcher, armature and screw, the corresponding conclusions are achieved. These conclusions established the foundation for the further researching on the mechanism of rail-type electromagnetic launcher.

Published
2014

38. The research of the detecting the armature position in the electromagnetic launcher bore

Author

Xu Weidong, Yan Ping, Zhao Hui, Ding Weijie, Yuan Weiqun, and Li Mancheng

Subjects
Engineering, business.industry, Induced voltage, Detector, Electrical engineering, Response time, Insulator (electricity), Laser, law.invention, Railgun, law, Real-time Control System, business, Armature (electrical engineering)
Abstract

In order to optimize the performance of the rapid fire rail gun, it is necessary to detect the armature position in the real time. The B-dot probe is the basic method to detect the armature position in the bore. The induced voltage signal of the probe is generated by the current of armature. This signal is affected with the current and velocity of the moving armature. The probe is invalid for the discontinuous current in the rapid fire rail gun. So another measurement should be developed. Some laser detectors are installed in the insulator along the armature moving direction. The output signal of the optical receiver is rising when the armature arrives at the laser position. So the velocity can be calculated by two signals. In the same time, the signal can be used as the control signals by shaping in rapid fire rail gun. The detecting principle, hardware portion of the system is described in this paper. The test results show that this system can detect the armature position and the response time is less than 216ns. The output signals can be used as the real time control signals.

Published
2014

39. Development on high-power and high power density capacitor charging power supply

Author

Sun Yaohong, Yuan Weiqun, Pin Yan, Wang Jiong, Gao Yinghui, Liu Kun, and Fu Rongyao

Subjects
Engineering, Switched-mode power supply, business.industry, Power module, Commutation cell, Electrical engineering, Power engineering, Power supply unit, Power factor, business, Constant power circuit, Power density
Abstract

This paper discussed the high-power and the miniaturization technology of capacitor charging power supply. The design and implementation of parallel operating high power density CCPS prototype with "peak current shifting control" was described. The single CCPS prototype output power is 35kW and the whole output power of parallel operating CCPS is 70kW. Based on high switching frequency of 50 kHz and optimized transient thermal design technology the power density of 28.8 W/in3 is achieved with 60s operating times.

Published
2014

42. Annealing Effects on DC Flashover Performance of PMMA in Vacuum

Author

Sun Guang-sheng, Yan Pin, Yuan Weiqun, and Zhang Chun-Lin

Subjects
Vacuum furnace, Materials science, X-ray photoelectron spectroscopy, Annealing (metallurgy), Electrode, Arc flash, Vacuum chamber, Dielectric, Composite material, Dielectric spectroscopy
Abstract

Commercial atactic poly (methyl methacrylate) (aPMMA) were tested to study the annealing effects on its DC flashover characteristics in vacuum. The PMMA samples were machined to 60 mm in diameter, 8 mm in height. After careful cleaning, the samples were prepared at Sub-Tg or near Tg in a vacuum oven for 2 hours, and cooled naturally. Samples were clumped between two steel electrodes in a vacuum chamber. All DC tests were done with the pressure below 3E-3 Pa, discharge current less than 20 mA. As expected, the annealing process did increase the surface flahover strength of PMMA. A notable phenomenon is that when the samples that annealed near Tg were polished again, their first flashover electrical strength was 80% higher than samples annealed at sub-Tg, and their conditioned flashover electrical strength was 90% higher. X-ray Photo-electron Spectroscopy (XPS) and Dielectric Spectroscopy analysis were performed to investigate the structure of PMMA. It is speculated that the stereo-complex formation in PMMA causes the great improvement in DC surface flashover performance in vacuum.

Published
2006

43. Breakdown Phenomena in Nitrogen Due to Repetitive Nanosecond-pulses

Author

Yan Ping, Shichang, Yuan Weiqun, Shao Tao, Wang Jue, Zhang, and Sun Guang-sheng

Subjects
Pulse repetition frequency, Materials science, Pulse (signal processing), business.industry, Electrical engineering, Nanosecond, Ion, law.invention, law, Metastability, biological sciences, Breakdown voltage, Atomic physics, Resistor, business, Voltage
Abstract

Nanosecond-pulse breakdown presents special characteristics, depending on the pulse rise time and duration. Based on a repetitive nanosecond-pulse generator, breakdown phenomena of parallel-plate gaps in nitrogen were investigated with single shot and repetitive burst conditions under different gap conditions. The relationships among applied voltage, pulse repetition frequency, breakdown time lag, repetitive pulse stress time, and the number of applied pulses are presented. The curves involved in E-field strength, breakdown time lag and gas pressure are also obtained. The results show that single nanosecond-pulse breakdown was different from repetitive nanosecond-pulse breakdown. Repetitive nanosecond-pulse breakdown should be associated with the accumulation effect of residual ions and metastable species created by previous pulses.

Published
2006

44. Signal acquisition and analysis in the breakdown experiments with repetition rate nanosecond-pulses

Author

Wang Jue, Shao Tao, Yuan Weiqun, Sun Guang-sheng, and Yan Ping

Subjects
Physics, Signal processing, Optics, business.industry, Electrical engineering, Waveform, Light emission, Electron, Luminous intensity, Nanosecond, business, Envelope (waves), Voltage
Abstract

In order to obtain experimental parameters of gas breakdown under repetitive nanosecond-pulses, acquisition of real-time signals associated with incident voltage, discharge current, repetitively stressing time, envelope waveforms and light emission is described. The electrical signals and luminous phenomenon during the repetition rate experiments are also analyzed. Relations between repetitively stressing time, number of applied pulses to breakdown, luminous intensity and repetition rates are presented. The discharge under high rep-rate is due to the initiation of a large number of electrons. Excitated particles and residual charges under high repetitive nanosecond-pulses would provide a large number of initiatory electrons and affect the development of gas breakdown.

Published
2005

45. Repetitively nanosecond-pulse breakdown of air at an atmospheric pressure

Author

Gao Wei, Zhang Shi-chang, Wang Jue, Yan Ping, Sun Guang-sheng, Yuan Weiqun, and Shao Tao

Subjects
Optics, Atmospheric pressure, Field (physics), Chemistry, Band gap, Pulse (signal processing), business.industry, Electric field, Breakdown voltage, Current (fluid), business, Voltage
Abstract

The breakdown characteristics of atmospheric air, for parallel-plate gaps, by single pulse and repetitive burst conditions were investigated under varying applied pulsed voltage and different gap lengths, respectively. The electrical parameters such as applied voltage and breakdown current, and the observational breakdown time lags and the repetitive stressing times are obtained. Experimental results show that the repetitive burst breakdown electric field is much lower than that of a single pulse, especially at repetitive bursts of 0.5 and 1 kHz. The observational breakdown time lag /spl tau/ and repetitively stressing time T are gradually reduced with increase of electrical field E, and these reducing trends seem to be big under lower pulse repetition frequencies (PRF), but smaller and more adjacent at higher PRF (0.5, 1 kHz). The discharge process under higher PRF bursts is quite different from low PRF bursts and single pulses, for which there is a slim difference. Some discussions were introduced to explain /spl tau/ and the discharge process.

Published
2004

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