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Journal articles on the topic 'Electromagnetic Airy pulse'

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Author: Grafiati

Published: 30 May 2022

Last updated: 31 May 2022

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1

Kouklan, Mohammad Hossein, Yousef Hojjat, and Toshiro Higuchi. "Air Impact Drive for Positioning by Pulse and Continuous Air Pressure." Journal of Robotics and Mechatronics 11, no. 4 (August 20, 1999): 263–68. http://dx.doi.org/10.20965/jrm.1999.p0263.

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In recent years, the application of impacts to precise positioning has been increased. Previously, the impulsive force or impact was generated by electromagnetic impulsive force or by the sudden deformation of a piezoelement. In this paper, a new actuator named as Air Impact Drive (AID) is introduced, in which the impact is generated by impulsive air pulse pressure. Free body diagrams and equations of this new actuator were drawn and determined. Experimental and theoretical results are in good agreement. The new actuator could displace a 0.2kg object at 0.1 of millimeter per pulse by pulse air pressure. By implementing suitable setup of parameters, the AID could move the object by continuous, constant air pressure with good linearity. This property is unique among other impact drives for positioning. By 0.3Mpa of source air pressure, the new actuator could move the mentioned object at the speed of approximately 13.4mm/s.

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2

Zhang, Han-Tian, Qian-Hong Zhou, Hai-Jing Zhou, Qiang Sun, Meng-Meng Song, Ye Dong, Wei Yang, and Jian-Sheng Yao. "Hybrid modelling of cavity system generated electromagnetic pulse in low pressure air." Acta Physica Sinica 71, no. 5 (2022): 055201. http://dx.doi.org/10.7498/aps.71.20211524.

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The surface of metal system exposed to ionizing radiation (X-ray and γ-ray) will emit high-energy electrons through the photoelectric effect and other processes. The transient electromagnetic field generated by the high-speed electron flow is called system generated electromagnetic pulse (SGEMP), which is difficult to shield effectively. An ongoing effort has been made to investigate the SGEMP response in vacuum by numerical simulation. However, the systems are usually operated in a gaseous environment. The objective of this paper is to investigate the effect of low-pressure air on the SGEMP. A three-dimensional hybrid simulation model is developed to calculate the characteristics of the electron beam induced air plasma and its interaction with the electromagnetic field. In the hybrid model, the high-energy photoelectrons are modelled as macroparticles, and secondary electrons are treaed as fluid for a balance between efficiency and accuracy. A cylindrical cavity with an inner diameter of 100 mm and a length of 50 mm is used. The photoelectrons are emitted from one end of the cavity and are assumed to be monoenergetic (20 keV). The photoelectron pulse follows a sine-squared distribution with a peak current density of 10 A/cm<sup>2</sup>, and its full width at half maximum is 2 ns. The results show that the number density of the secondary electrons near the photoelectron emission surface and its axial gradient increase as air pressure increases. The electron number density in the middle of the cavity shows a peak value at 20 Torr (1 Torr = 133 Pa). The electron temperature decreases monotonically with the increase in pressure. The low-pressure air plasma in the cavity prevents the space charge layer from being generated. The peak value of the electric field is an order of magnitude lower than that in vacuum, and the pulse width is also significantly reduced. The emission characteristic of the photoelectrons determines the peak value of the current response. The current reaching the end of the cavity surface first increases and then decreases with pressure increasing. The plasma return current can suppress the rising rate of the total current and extend the duration of current responses. Finally, to validate the established hybrid simulation model, the calculated magnetic field is compared with that from the benchmark experiments. This paper helps to achieve a better prediction of the SGEMP response in a gaseous environment. Compared with the particle-in-cell Monte Carlo collision method, the hybrid model adopted can greatly reduce the computational cost.

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3

Mahmud, Md Iqbal, and Haeng Muk Cho. "Analysis of Crankcase Flow of an Automobile ECV for Air Conditioning Control System." Applied Mechanics and Materials 373-375 (August 2013): 421–26. http://dx.doi.org/10.4028/www.scientific.net/amm.373-375.421.

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Electromagnetic control valve (ECV) controls an automobile vehicle air conditioning compressor based on a pulse width modulation (PWM) input signal that supplied from an external controller. For maintaining a suitable range of temperatures inside the vehicle, suction and crankcase port pressure controls the swash (wobble) plate at certain angle. Suction and crankcase port pressure controlled in ECV can be analyzed by experimental test by considering different technical assumptions. This research paper highlights the flow of air from crankcase port with correspondence with amount of variable supply of current to obtain the experimental test data which is important to maintain the vehicle temperature inside the compartment for passengers comfort.

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4

Yu, Kexun, Hanting Zhu, Xianfei Xie, Huijie Duan, Jiamin Ding, Changping Sun, and Zhaoyang Bao. "Loss Analysis of Air-Core Pulsed Alternator Driving an Ideal Electromagnetic Railgun." IEEE Transactions on Transportation Electrification 7, no. 3 (September 2021): 1589–99. http://dx.doi.org/10.1109/tte.2021.3051630.

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5

Buskirk, Fred R., and John R. Neighbours. "Čerenkov radiation and electromagnetic pulse produced by electron beams traversing a finite path in air." Physical Review A 34, no. 4 (October 1, 1986): 3470–73. http://dx.doi.org/10.1103/physreva.34.3470.

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6

Filonenko, A. D. "On the nature of an anomalous RF electromagnetic pulse caused by an extensive air shower." Technical Physics Letters 27, no. 5 (May 2001): 398–400. http://dx.doi.org/10.1134/1.1376763.

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7

Yu, Kexun, Jiakang Yao, Xianfei Xie, Fengwei Zhang, and Peng Tang. "3-D FEM Analysis on Electromagnetic Characteristics of an Air-Core Pulsed Alternator." IEEE Transactions on Plasma Science 45, no. 7 (July 2017): 1257–62. http://dx.doi.org/10.1109/tps.2017.2705140.

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8

Xie, Xianfei, Kexun Yu, Caiyong Ye, Qilin You, Lei Tang, and Hua Zhang. "Design Considerations of an Air-Core Pulsed Alternator in an Electromagnetic Railgun System." IEEE Transactions on Plasma Science 43, no. 11 (November 2015): 3895–900. http://dx.doi.org/10.1109/tps.2015.2480789.

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9

Bleier, T., C. Dunson, M. Maniscalco, N. Bryant, R. Bambery, and F. Freund. "Investigation of ULF magnetic pulsations, air conductivity changes, and infra red signatures associated with the 30 October Alum Rock M5.4 earthquake." Natural Hazards and Earth System Sciences 9, no. 2 (April 16, 2009): 585–603. http://dx.doi.org/10.5194/nhess-9-585-2009.

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Abstract. Several electromagnetic signal types were observed prior to and immediately after 30 October 2007 (Local Time) M5.4 earthquake at Alum Rock, Ca with an epicenter ~15 km NE of San Jose Ca. The area where this event occurred had been monitored since November 2005 by a QuakeFinder magnetometer site, unit 609, 2 km from the epicenter. This instrument is one of 53 stations of the QuakeFinder (QF) California Magnetometer Network-CalMagNet. This station included an ultra low frequency (ULF) 3-axis induction magnetometer, a simple air conductivity sensor to measure relative airborne ion concentrations, and a geophone to identify the arrival of the P-wave from an earthquake. Similar in frequency content to the increased ULF activity reported two weeks prior to the Loma Prieta M7.0 quake in 1989 (Fraser-Smith, 1990, 1991), the QF station detected activity in the 0.01–12 Hz bands, but it consisted of an increasing number of short duration (1 to 30 s duration) pulsations. The pulsations peaked around 13 days prior to the event. The amplitudes of the pulses were strong, (3–20 nT), compared to the average ambient noise at the site, (10–250 pT), which included a component arising from the Bay Area Rapid Transit (BART) operations. The QF station also detected different pulse shapes, e.g. negative or positive only polarity, with some pulses including a combination of positive and negative. Typical pulse counts over the previous year ranged from 0–15 per day, while the count rose to 176 (east-west channel) on 17 October, 13 days prior to the quake. The air conductivity sensor saturated for over 14 h during the night and morning prior to the quake, which occurred at 20:29 LT. Anomalous IR signatures were also observed in the general area, within 50 km of the epicenter, during the 2 weeks prior to the quake. These three simultaneous EM phenomena were compared with data collected over a 1–2-year period at the site. The data was also compared against accounts of air ionization reported to be associated with radon emission from the ground (Ouzounov, 2007), and a series of laboratory rock stressing experiments (Freund, 2006, 2007a, b, c) to determine if field data was consistent either of these accounts. We could not find a data set with pre-earthquake radon measurements taken near the Alum Rock epicenter to compare against our field data. However, based on the Alum Rock data set example and another data set at Parkfield, the field tests are at least consistent with the lab experiments showing currents, magnetic field disturbances, air conductivity changes, and IR signatures. This is encouraging, but more instrumented earthquake examples are needed to prove a repeating pattern for these types of pre-earthquake EM signatures. For more information on QuakeFinder please view http://www.quakefinder.com.

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10

Xie, Xianfei, Kexun Yu, Fengwei Zhang, Peng Tang, and Jiakang Yao. "Simulation of a Seven-Phase Air-Core Pulsed Alternator Driving the Electromagnetic Rail Gun." IEEE Transactions on Plasma Science 45, no. 7 (July 2017): 1251–56. http://dx.doi.org/10.1109/tps.2017.2705137.

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11

Pang, Seung-Ki, and Jae-Hoon Kim. "Design Optimization for Air Ducts and Fluid Pipes at Electromagnetic Pulse(EMP) Shield in Highly Secured Facilities." Transactions of the Korea Society of Geothermal Energy Engineers 10, no. 4 (December 1, 2014): 15–24. http://dx.doi.org/10.17664/ksgee.2014.10.4.015.

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12

Wei, Hong-Cheng, and Jean-Fu Kiang. "NEAR-GROUND TRANSIENT FIELD OF A HIGH-ALTITUDE ELECTROMAGNETIC PULSE (HEMP) CONSIDERING NONLINEAR AIR CONDUCTIVITY AND GROUND REFLECTION." Progress In Electromagnetics Research M 48 (2016): 45–54. http://dx.doi.org/10.2528/pierm16021901.

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13

Gladyshev, V. O., E. A. Sharandin, A. V. Skrabatun, and P. P. Nikolaev. "Competing processes in generation of the third optical harmonic in air under femtosecond infrared repetitively pulsed excitation." Journal of Physics: Conference Series 2081, no. 1 (November 1, 2021): 012003. http://dx.doi.org/10.1088/1742-6596/2081/1/012003.

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Abstract Parametric interaction of electromagnetic and gravitational waves with the radiation generation at the third harmonic wavelength is one of the ways to detect gravitational interaction in a material medium. To implement the effect in question, superstrong fields must be used, but in this case competing nonlinear processes arise, leading to the generation of the third harmonic as a result of laser radiation filamentation. This paper investigates the characteristics of the radiation recorded for femtosecond (250 fs) laser pulses with a wavelength of λ = 1032 nm focused in air. The threshold pump power made it possible to observe the formation of a filament with concomitant generation of narrow-band radiation at the focus of the lens at the third harmonic wavelength λ = 344 nm. The research presents spectral and spatial dependences of ultraviolet radiation (λ = 344 nm) at pumping power of infrared radiation (λ = 1032 nm) of 500 mW. Energy dependences of the third harmonic generation efficiency in the power range from 150 to 1750 mW are obtained.

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14

Shifman, Y., and Y. Leviatan. "Analysis of transient interaction of electromagnetic pulse with an air layer in a dielectric medium using wavelet-based implicit TDIE formulation." IEEE Transactions on Microwave Theory and Techniques 50, no. 8 (August 2002): 2018–22. http://dx.doi.org/10.1109/tmtt.2002.801362.

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15

Kotsur, I. M., A. V. Hurazda, B. A. Dolia, and L. E. Shestov. "An energy efficient electric drive of air units." Electrical Engineering and Power Engineering, no. 1 (March 31, 2021): 18–25. http://dx.doi.org/10.15588/1607-6761-2021-1-2.

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Purpose. Improving the efficiency and energy performance of an asynchronous electric drive for stationary fan’s units of the main ventilation line of mines. Methodology. The research was carried out using the methods of the theory of electrical circuits, mathematical physics, simulation, interpolation and approximation Findings. The research of electromagnetic and energy processes in the asynchronous electric drive system with pulse control at a fan load, taking into account the variable aerodynamic parameters of the main ventilation line of mines. An electric drive system is able to respond with high accuracy and reliability to changes in the aerodynamic parameters of the main ventilation line of mines has been proven. This will also increase the power factor of the electric drive at a fan load up 0.8 to 0.93 p.u., and the efficiency up 92.5% to 94.5%, when regulating in the range of the operating slip of the rotor of the drive fan motor = 0.5 ÷, which, respectively, is on average up 0,25% to 40 higher in comparison with systems of an unregulated electric drive. Recommendations has been developed for the design and rational selection of the rated fan capacity for the main ventilation line to advance the best energy efficiency level of the electric drive. Originality. The research of electro-mechanical, electro-energy power and aerodynamic processes in the dynamic modes of the fan electric drive was carried out. The fan-loaded "induction motor-converter" system has been proven to be self-regulating. It is able to respond with high accuracy and reliability even at low switching frequencies of the power chopper to any changes of the aerodynamic parameters of the main ventilation line of mines. Practical value. Recommendations has been developed for the design and rational selection of the rated fan capacity for the main ventilation line to advance the best energy efficiency level of the electric drive.

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16

Pang, Seung-Ki, Hye-Rin Ahn, and Jong-Gwan Yook. "Evaluation of Air Flow Characteristics in accordance with Types of Waveguide-Below-Cutoff (WBC) Arrays and Their Shielding Effectiveness of Electromagnetic Pulse (EMP)." Transactions of the Korea Society of Geothermal Energy Engineers 12, no. 3 (September 1, 2016): 1–8. http://dx.doi.org/10.17664/ksgee.2016.12.3.001.

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17

Sprangle, P., J. R. Peñano, B. Hafizi, and C. A. Kapetanakos. "Ultrashort laser pulses and electromagnetic pulse generation in air and on dielectric surfaces." Physical Review E 69, no. 6 (June 17, 2004). http://dx.doi.org/10.1103/physreve.69.066415.

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18

Kaleris, Konstantinos, Ioannis Tazes, Yannis Orphanos, Stelios Petrakis, Makis Bakarezos, John Mourjopoulos, Vasilis Dimitriou, Michael Tatarakis, and Nektarios A. Papadogiannis. "Experimentally validated modeling of the optical energy deposition in highly ionized ambient air by strong femtosecond laser pulses." European Physical Journal D 75, no. 8 (August 2021). http://dx.doi.org/10.1140/epjd/s10053-021-00237-x.

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Abstract The deposition of femtosecond laser optical energy in gases leads to the emission of secondary electromagnetic and acoustic radiation. These optoacoustic components have a complex nonlinear dependency on the laser beam characteristics, such as the pulse energy, duration, wavelength and the focusing conditions, as well as on the optical and elastic characteristics of the gaseous medium. The initial interaction times are governed by the high electronic excitation and ionization. These phenomena result in a self-modulation of the laser pulse, significantly affecting the optical energy deposition on the medium. Such complex nonlinear phenomena are very difficult to be studied via analytical equations. To address this, a multiphysics Particle-In-Cell model is applied for the evaluation of the optical energy deposition and plasma generation from tightly focused femtosecond pulses in ambient air. The computational domain of the model is built to describe optical energy deposition in its full spatiotemporal scale. The model is validated by experimental results of the absorbed energy. The agreement between the computational and experimental results provides the basis for the future development of an advanced microstructural Finite Element Method model, which, combined with the Particle-In-Cell model, will have the ability of delivering detailed insights for all the sub-domains and timescales varying from nano- to femto-seconds of the laser-induced breakdown phenomenon. Graphic Abstract

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19

Aleshkin, A. P., K. V. Bakursky, V. M. Мoskalyev, and T. O. Myslivtsev. "Electric breakdown of air by nanosecond pulses of electromagnetic radiation." Izvestiâ vysših učebnyh zavedenij. Priborostroenie, April 12, 2017, 359–66. http://dx.doi.org/10.17586/0021-3454-2017-60-4-359-366.

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20

Jovanović, Dragan, Miomir Raos, Milena Jovanović, and Milena Medenica. "AIR POLLUTION AND THE FILTRATION PROCESSING SYSTEMS FOR THE BITUMINOUS MATERIAL PLANTS." Facta Universitatis, Series: Working and Living Environmental Protection, January 27, 2018, 159. http://dx.doi.org/10.22190/fuwlep1702159j.

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It is known that particulate matters of different granulations are one of the most important air and environmental pollutants, in general. This paper presents a prototype system for filtering particulate matter from extinguishing gases of a bitumen preparation plant using a "jet pulse" method for filter bags cleaning. For such type of filter plant, due to technological reasons, there is the need to create a shock wave which is required for the cleaning of the filter bags. The shock wave is generated by electromagnetic valves, whereas the tactile of the valve is determined by special controller depending on the type of filter, bags and air pollution. The result obtained through the use of special types of controllers allows the life span of the electric fan and the prevention of their overheating and damage.

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