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Two-dimensional investigation of characteristic parameters and their gradients for the self-generated electric and magnetic fields of laser-induced zirconium plasma
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作者 Tayyaba SAJID Shazia BASHIR +2 位作者 Mahreen AKRAM Maira RAZZAQ Khaliq MAHMOOD 《Plasma Science and Technology》 SCIE EI CAS CSCD 2024年第5期138-155,共18页
Two-dimensional diagnosis of laser-induced zirconium(Zr)plasma has been experimentally performed using the time-of-flight method by employing Faraday cups in addition to electric and magnetic probes.The characteristic... Two-dimensional diagnosis of laser-induced zirconium(Zr)plasma has been experimentally performed using the time-of-flight method by employing Faraday cups in addition to electric and magnetic probes.The characteristic parameters of laser-induced Zr plasma have been evaluated as a function of different laser irradiances ranging from 4.5 to 11.7 GW cm-2 at different axial positions of 1–4 cm with a fixed radial distance of 2 cm.A well-supporting correlation between the plume parameters and the laser-plasma-produced spontaneous electric and magnetic(E and B)fields was established.The measurements of the characteristic parameters and spontaneously induced fields were observed to have an increasing trend with the increasing laser irradiance.However,when increasing the spatial distance in both the axial and radial directions,the plasma parameters(electron/ion number density,temperature and kinetic energy)did not show either continuously increasing or decreasing trends due to various kinetic and dynamic processes during the spatial evolution of the plume.However,the E and B fields were observed to be always diffusing away from the target.The radial component of electron number densities remained higher than the axial number density component,whereas the axial ion number density at all laser irradiances and axial distances remained higher than the radial ion number density.The higher axial self-generated electric field(SGEF)values than radial SGEF values are correlated with the effective charge-separation mechanism of electrons and ions.The generation of a self-generated magnetic field is observed dominantly in the radial direction at increasing laser irradiance as compared to the axial one due to the deflection of fast-moving electrons and the persistence of two-electron temperature on the radial axis. 展开更多
关键词 Faraday cup axial and radial expansion space-charge effect laser-induced zirconium plasma two-electron temperature distribution self-generated electric and magnetic fields
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Simultaneous resonance of an axially moving ferromagnetic thin plate under a line load in a time-varying magnetic field 被引量:1
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作者 Xie Mengxue Hu Yuda Xu Haoran 《Earthquake Engineering and Engineering Vibration》 SCIE EI CSCD 2023年第4期951-963,共13页
In this paper,the simultaneous resonance of a ferromagnetic thin plate in a time-varying magnetic field,having axial speed and being subjected to a periodic line load,is studied.Based on the large deflection theory of... In this paper,the simultaneous resonance of a ferromagnetic thin plate in a time-varying magnetic field,having axial speed and being subjected to a periodic line load,is studied.Based on the large deflection theory of thin plates and electromagnetic field theory,the nonlinear vibration differential equation of the plate is obtained by using the Hamilton′s principle and the Galerkin method.Then the boundary condition in which the longer opposite sides are clamped and hinged is considered.The dimensionless nonlinear differential equations are solved by using the method of multiple scales,and the analytical solution is given.In addition,the stability analysis is also carried out by using Lyapunov stability theory.Through numerical analysis,the variation curves of system resonance amplitude with frequency tuning parameter,magnetic field strength and external excitation amplitude are obtained.Different parameters that have significant effects on the response of the system,such as the thickness,the axial velocity,the magnetic field intensity,the position,and the frequency of external excitation,are considered and analyzed.The results show that the system has multiple solution regions and obvious nonlinear coupled characteristics. 展开更多
关键词 ferromagnetic thin plate time-varying magnetic field simultaneous resonance axially moving line load
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Simulation Researches on Influence of Different Axial Magnetic Fields on Anode Activity in High-current Vacuum Arcs 被引量:8
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作者 WANG Lijun JIA Shenli CHEN Bin ZHOU Xin YANG Dingge SHI Zongqian 《中国电机工程学报》 EI CSCD 北大核心 2012年第13期I0018-I0018,201,共1页
纵向磁场对阳极活动的控制效果对于大电流真空电弧成功开断十分关键。采用建模仿真的方法,分析不同纵向磁场强度对阳极活动的影响。基于大电流真空电弧模型,仿真得到不同纵向磁场强度下输入阳极的能流密度分布,并以此作为阳极活动模... 纵向磁场对阳极活动的控制效果对于大电流真空电弧成功开断十分关键。采用建模仿真的方法,分析不同纵向磁场强度对阳极活动的影响。基于大电流真空电弧模型,仿真得到不同纵向磁场强度下输入阳极的能流密度分布,并以此作为阳极活动模型的边界条件,得到不同磁场强度下的阳极熔化、蒸发情况。仿真结果表明:对于工频电流(50Hz)电弧,阳极温度的最大值出现7ms时刻附近;随着纵向磁场的增大,阳极表面温度、饱和蒸汽压、阳极蒸汽流量都相应减小;随着纵向磁场的增大,熔化半径增大,但是熔化深度减小,改善了阳极的烧蚀情况。 展开更多
关键词 大电流真空电弧 阳极活性 轴向磁场 仿真方法 磁场控制 高电流
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Distribution of Cathode Spots in Vacuum Arc Under Nonuniform Axial Magnetic Fields
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作者 史宗谦 贾申利 +2 位作者 王立军 李兴文 王政 《Plasma Science and Technology》 SCIE EI CAS CSCD 2007年第6期666-669,共4页
Recent results on the distribution of vacuum arc cathode spots (CSs) in nonuniform axial magnetic field (AMF) are presented. Based on previous studies, we deem that two contrary influences of AMF, inward effect an... Recent results on the distribution of vacuum arc cathode spots (CSs) in nonuniform axial magnetic field (AMF) are presented. Based on previous studies, we deem that two contrary influences of AMF, inward effect and outward effect, are attributed to CSs distribution. With this notion, we have analyzed the controlling effectiveness of nonuniform AMF on CSs distribution. Experiments were conducted in a detachable vacuum chamber with iron-style AMF electrodes. Images of vacuum arc column and the distribution of CSs were photographed with a high-speed charge coupled device (CCD) camera. Experimental results agreed well with the theoretical analysis. 展开更多
关键词 axial magnetic field cathode spots vacuum arc
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Numerical simulation of low-current vacuum arc jet considering anode evaporation in different axial magnetic fields
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作者 Zhefeng ZHANG Lijun WANG +2 位作者 Ze YANG Ming LUO Jiagang LI 《Plasma Science and Technology》 SCIE EI CAS CSCD 2022年第4期13-20,共8页
As the main source of the vacuum arc plasma,cathode spots(CSs)play an important role on the behaviors of the vacuum arc.Their characteristics are affected by many factors,especially by the magnetic field.In this paper... As the main source of the vacuum arc plasma,cathode spots(CSs)play an important role on the behaviors of the vacuum arc.Their characteristics are affected by many factors,especially by the magnetic field.In this paper,the characteristics of the plasma jet from a single CS in vacuum arc under external axial magnetic field(AMF)are studied.A multi-species magneto-hydro-dynamic(MHD)model is established to describe the vacuum arc.The anode temperature is calculated by the anode activity model based on the energy flux obtained from the MHD model.The simulation results indicate that the external AMF has a significant effect on the characteristic of the plasma jet.When the external AMF is high enough,a bright spot appears on the anode surface.This is because with a higher AMF,the contraction of the diffused arc becomes more obvious,leading to a higher energy flux to the anode and thus a higher anode temperature.Then more secondary plasma can be generated near the anode,and the brightness of the‘anode spot’increases.During this process,the arc appearance gradually changes from a cone to a dumbbell shape.In this condition,the arc is in the diffuse mode.The appearance of the plasma jet calculated in the model is consistent with the experimental results. 展开更多
关键词 vacuum arc plasma jet axial magnetic fields
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A numerical survey of parameters to reach ignition condition for axial compression of a large-sized field reversed configuration
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作者 李宜霖 廖晖 +1 位作者 周海洋 孙玄 《Plasma Science and Technology》 SCIE EI CAS CSCD 2024年第5期47-55,共9页
Field reversed configuration(FRC)is widely considered as an ideal target plasma for magnetoinertial fusion.However,its confinement and stability,both proportional to the radius,will deteriorate inevitably during radia... Field reversed configuration(FRC)is widely considered as an ideal target plasma for magnetoinertial fusion.However,its confinement and stability,both proportional to the radius,will deteriorate inevitably during radial compression.Hence,we propose a new fusion approach based on axial compression of a large-sized FRC.The axial compression can be made by plasma jets or plasmoids converging onto the axial ends of the FRC.The parameter space that can reach the ignition condition while preserving the FRC's overall quality is studied using a numerical model based on different FRC confinement scalings.It is found that ignition is possible for a large FRC that can be achieved with the current FRC formation techniques if compression ratio is greater than 50.A more realistic compression is to combine axial with moderate radial compression,which is also presented and calculated in this work. 展开更多
关键词 field reversed configuration magnetized target fusion axial compression
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Effects of geometric parameters and axial magnetic field on buoyant-thermocapillary convection during detached solidification
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作者 李震 彭岚 李友荣 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2014年第5期1512-1520,共9页
In order to understand the effect of geometric parameters and axial magnetic field on buoyant-thermocapillary convection during detached solidification, a series of threedimensional numerical simulations were conducte... In order to understand the effect of geometric parameters and axial magnetic field on buoyant-thermocapillary convection during detached solidification, a series of threedimensional numerical simulations were conducted by the finite-difference method. The results indicate that the stable flow is observed when the Marangoni number (Ma) is small; however, when the value of Ma increases and exceeds a threshold value, the stable steady flow transits to be unstable flow. As the height of the melt increases, the flow is enhanced at first and then gets weakened. As the width of gap decreases gradually, the strength of flow is enhanced. The approach of using axial magnetic field is an effective way to suppress the buoyant-thermocapillary convection. As the magnetic field strength increases, the inhibition is enhanced. The critical Marangoni number increases slightly with a greater melt height, a narrower width of gap, and a more strength of magnetic field. 展开更多
关键词 crystal growth detached solidification buoyant-thermocapillary convection axial magnetic field
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Effect of an axial magnetic field on a DC argon arc 被引量:6
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作者 黎林村 夏维东 《Chinese Physics B》 SCIE EI CAS CSCD 2008年第2期649-654,共6页
In this paper a commercial CFD (computational fluid dynamics) code FLUENT has been used and modified for the axisymmetric swirl and time-dependent simulation of an atmospheric pressure argon arc in an external axial... In this paper a commercial CFD (computational fluid dynamics) code FLUENT has been used and modified for the axisymmetric swirl and time-dependent simulation of an atmospheric pressure argon arc in an external axial magnetic field (AMF). The computational domain includes the arc itself and the anodic region. Numerical results demonstrate that the AMF substantially increases the tangential component of the plasma velocity. The resulting centrifugal force for the plasma rotation impels it to travel to the arc mantel and as a result, a low-pressure region appears at the arc core. With the AMF, the arc presents a hollow bell shape and correspondingly, the maximal values of the temperature, pressure and current density on the anode surface are departing from the arc centreline. 展开更多
关键词 arc modeling axial magnetic field FLUENT
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Simulation Research of Magnetic Constriction Effect and Controlling by Axial Magnetic Field of Vacuum Arc 被引量:3
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作者 王立军 贾申利 +1 位作者 史宗谦 荣命哲 《Plasma Science and Technology》 SCIE EI CAS CSCD 2005年第1期2687-2692,共6页
Based on magnetohydrodynamic (MHD) model of vacuum arc, the computer simulation of vacuum arc was carried out in this paper. In the MHD model, mass conservation equation, momentum conservation equations, energy conser... Based on magnetohydrodynamic (MHD) model of vacuum arc, the computer simulation of vacuum arc was carried out in this paper. In the MHD model, mass conservation equation, momentum conservation equations, energy conservation equations, generalized ohm's law and Maxwell equation were considered. MHD equations were calculated by numerical method, and the distribution of vacuum arc plasma parameters and current density were obtained. Simulation results showed that the magnetic constriction effect of vacuum arc is primarily caused by the Hall effect. In addition, the inhibition of axial magnetic field (AMF) on constriction of vacuum arc was calculated and analyzed. 展开更多
关键词 vacuum arc MHD magnetic constriction axial magnetic field
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Arc Behaviours in Vacuum Interrupters with Axial Magnetic Field Electrodes 被引量:3
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作者 王仲奕 郑跃胜 +1 位作者 刘志远 程少勇 《Plasma Science and Technology》 SCIE EI CAS CSCD 2008年第5期569-574,共6页
To improve the limiting current interruption capability and minimizing vacuum interrupter with axial magnetic field (AMF) electrodes, it is significant to investigate the vacuum arc behaviours between the contacts. ... To improve the limiting current interruption capability and minimizing vacuum interrupter with axial magnetic field (AMF) electrodes, it is significant to investigate the vacuum arc behaviours between the contacts. AMF distributions of the slot type electrodes were studied by both numerical analysis and experiments. Furthermore, the behaviours of vacuum arcs for different parameters of the slot type AMF electrodes were investigated by using high-speed CCD camera. The influences of gap distance, contact diameter and phase shift time between AMF and arc current on the vacuum arc were investigated. The results provide a reference for research and development of vacuum interrupters with slot type or other types of AMF electrode. 展开更多
关键词 vacuum interrupter vacuum arc axial magnetic field finite element
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Influence of the axial magnetic field on sheath development after current zero in a vacuum circuit breaker 被引量:2
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作者 Yi CHEN Fei YANG +3 位作者 Hao SUN Yi WU Chunping NIU Mingzhe RONG 《Plasma Science and Technology》 SCIE EI CAS CSCD 2017年第6期20-25,共6页
After current zero,which is the moment when the vacuum circuit breaker interrupts a vacuum arc,sheath development is the first process in the dielectric recovery process.An axial magnetic field(AMF) is widely used i... After current zero,which is the moment when the vacuum circuit breaker interrupts a vacuum arc,sheath development is the first process in the dielectric recovery process.An axial magnetic field(AMF) is widely used in the vacuum circuit breaker when the high-current vacuum arc is interrupted.Therefore,it is very important to study the influence of different AMF amplitudes on the sheath development.The objective of this paper is to study the influence of different AMF amplitudes on the sheath development from a micro perspective.Thus,the particle in cell-Monte Carlo collisions(PIC-MCC) method was adopted to develop the sheath development model.We compared the simulation results with the experimental results and then validated the simulation.We also obtained the speed of the sheath development and the energy density of the ions under different AMF amplitudes.The results showed mat the larger the AMF amplitudes are,the faster the sheath develops and the lower the ion energy density is,meaning the breakdown is correspondingly more difficult. 展开更多
关键词 vacuum arc SHEATH PIC-MCC axial magnetic field vacuum circuit breakers
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Investigation of Vacuum Arc Voltage Characteristics Under Different Axial Magnetic Field Profiles 被引量:1
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作者 贾申利 宋晓川 +2 位作者 霍新陶 史宗谦 王立军 《Plasma Science and Technology》 SCIE EI CAS CSCD 2010年第6期729-733,共5页
Characteristics of the arc voltage under different profiles of axial magnetic field were investigated experimentally in a detachable vacuum chamber with five pairs of specially designed electrodes generating both bell... Characteristics of the arc voltage under different profiles of axial magnetic field were investigated experimentally in a detachable vacuum chamber with five pairs of specially designed electrodes generating both bell-shaped and saddle-shaped magnetic field profile. The arc column and cathode spot images were photographed by a high speed digital camera. The dependence of the arc voltage on arcing evolution is analyzed. It is indicated that the axial magnetic field profile could affect the arc behaviors significantly, and the arc voltage is closely related to the arc light intensity. 展开更多
关键词 vacuum arc axial magnetic field arc voltage light intensity
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Axial Magnetic Field Effects on Xenon Short-Arc Lamps
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作者 王城 陈瑭 +2 位作者 李皖皖 查俊 夏维东 《Plasma Science and Technology》 SCIE EI CAS CSCD 2014年第12期1096-1099,共4页
The effect of an axial magnetic field (AMF) on an old xenon short-arc lamp is experimentally investigated in this work. As the AMF increases up to 18 roT, the visible radiation power and electric power ascend more t... The effect of an axial magnetic field (AMF) on an old xenon short-arc lamp is experimentally investigated in this work. As the AMF increases up to 18 roT, the visible radiation power and electric power ascend more than 80% and 70% respectively, and the radiation efficiency is improved by 23% for the best increment at 12 mT AMF. The measurement of radiation intensity shows that the increment of radiation intensity comes mostly from the plasma area close to the cathode tip, and partially from the other area of the arc column. Successive images of the arc indicate that the arc column not only rotates about its axis, but revolves around the axis of electrodes with the AMF. The arc column structure is constricted, distorted and elongated as the AMF increases. It is suggested that the improvements of the radiation intensity and radiation efficiency are attributed to the constriction of the arc column, which is mainly induced by the enhanced cathode jet. 展开更多
关键词 xenon lamp axial magnetic field amf radiation intensity cathode jet
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Modulation of absorption manner in helicon discharges by changing profile of low axial magnetic field
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作者 赵高 王宇 +3 位作者 牛晨 刘忠伟 欧阳吉庭 陈强 《Chinese Physics B》 SCIE EI CAS CSCD 2017年第10期302-309,共8页
The modulation of absorption manner in helicon discharge by changing the profile of low axial magnetic field is explored experimentally in this work. The experiments are carried out in Boswell-type antenna driven by 1... The modulation of absorption manner in helicon discharge by changing the profile of low axial magnetic field is explored experimentally in this work. The experiments are carried out in Boswell-type antenna driven by 13.56-MHz power source in 0.35-Pa argon environment. The peak of the external non-uniform magnetic field (Bex) along the axis is observed in a range from 0 Gs to 250 Gs (1 Gs=10^-4 T), where the electron density varies from 0.5×10^16 m^-3 to 9×10^16 m^-3. When Bex is located near the tube upper end sealed by a dielectric plate, or near the tube bottom end connected with a diffusion chamber, the plasmas are centralized in the tube in the former case while the strong luminance appears between the edge of the tube and the axial line in the latter case. When Bex is located in the middle of the antenna, moreover, an effective resistance (Reff) peak appears apparently with increasing magnetic field. The glow moves toward first the edge of the tube and then the two antenna legs as the magnetic field increases. The discharge in this case is caused by the absorption of Trivelpiece-Gould (TG) wave. It is suggested that Bex is located in the middle of the antenna to obtain a higher efficiency of power transfer. 展开更多
关键词 helicon discharge absorption manner low supply power low axial magnetic field
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Experimental Investigation on the Inf1uence of Axial Magnetic Field Distribution on Resisting the Constriction of a High-Current Vacuum Arc
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作者 史宗谦 刘志刚 +2 位作者 贾申利 宋晓川 王立军 《Plasma Science and Technology》 SCIE EI CAS CSCD 2009年第3期290-292,共3页
Effect of the axial magnetic field (AMF) on resisting the constriction of a highcurrent vacuum arc is studied in this paper. Two typical AMF distributions were investigated, i.e., the traditional bell-shaped AMF, an... Effect of the axial magnetic field (AMF) on resisting the constriction of a highcurrent vacuum arc is studied in this paper. Two typical AMF distributions were investigated, i.e., the traditional bell-shaped AMF, and the saddle-shaped AMF. Experiments were conducted in a detachable vacuum chamber with arms arc current in the range of 10 kA to 25 kA. The arc column was photographed by a high-speed digital camera with an exposure time of 2 microseconds. The constriction of the vacuum arc was compared by processing the images of the arc column under the two different field configurations and numerically determining the dimensions of the arc column near the electrodes. It was also confirmed that the AMF distribution had a significant influence on its effectiveness in resisting arc constriction. of the arc is more influential than that at the Furthermore, the AMF strength near the periphery centre of the electrodes in resisting arc constriction. 展开更多
关键词 axial magnetic field vacuum arc arc constriction
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Electron-Cyclotron Laser Using Free-Electron Two-Quantum Stark Radiation in a Strong Uniform Axial Magnetic Field and an Alternating Axial Electric Field in a Voltage-Supplied Pill-Box Cavity
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作者 S.H.Kim 《Chinese Physics Letters》 SCIE CAS CSCD 2016年第3期56-59,共4页
We consider the radiation from the beam electrons traveling in a strong uniform axial magnetic field and an axial alternating electric field of wavelength Aw generated by a voltage-supplied pill-box cavity. The beam e... We consider the radiation from the beam electrons traveling in a strong uniform axial magnetic field and an axial alternating electric field of wavelength Aw generated by a voltage-supplied pill-box cavity. The beam electrons emit genuine laser radiation that propagates only in the axial direction through free-electron two- quantum Stark radiation. We find that laser radiation takes place only at the expense of the axial kinetic energy when Aw 〈〈 c/(ωc/γ), where ωc/γ is the relativistic electron--cyclotron frequency. We formulate the laser power based on quantum-wiggler electrodynamics, and envision a laser of length lore with estimated power 0.1 GW/(kA) in the 10-4 cm wavelength range. 展开更多
关键词 of on in that Electron-Cyclotron Laser Using Free-Electron Two-Quantum Stark Radiation in a Strong Uniform axial magnetic field and an Alternating axial Electric field in a Voltage-Supplied Pill-Box Cavity is STARK
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Axial magnetic field effect in numerical analysis of high power Cherenkov free electron laser
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作者 F BazoubAND B Maraghechi 《Chinese Physics B》 SCIE EI CAS CSCD 2019年第6期176-183,共8页
Cherenkov free electron laser(CFEL) is simulated numerically by using the single particle method to optimize the electron beam. The electron beam is assumed to be moving near the surface of a flat dielectric slab alon... Cherenkov free electron laser(CFEL) is simulated numerically by using the single particle method to optimize the electron beam. The electron beam is assumed to be moving near the surface of a flat dielectric slab along a growing radiation. The set of coupled nonlinear differential equations of motion is solved to study the electron dynamics. For three sets of parameters, in high power CFEL, it is found that an axial magnetic field is always necessary to keep the electron beam in the interaction region and its optimal strength is reported for each case. At the injection point, the electron beam’s distance above the dielectric surface is kept at a minimum value so that the electrons neither hit the dielectric nor move away from it to the weaker radiation fields and out of the interaction region. The optimal electron beam radius and current are thereby calculated. This analysis is in agreement with two previous numerical studies for a cylindrical waveguide but is at odds with analytical treatments of a flat dielectric that does not use an axial magnetic field. This is backed by an interesting physical reasoning. 展开更多
关键词 Cherenkov free electron laser axial magnetic field flat dielectric slab electron beam
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Determination of the heating efficiency of magnetotactic bacteria in alternating magnetic field 被引量:1
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作者 Tongwei ZHANG Huangtao XU +2 位作者 Jia LIU Yongxin PAN Changqian CAO 《Journal of Oceanology and Limnology》 SCIE CAS CSCD 2021年第6期2116-2126,共11页
Magnetotactic bacteria(MTB)intact cells have been applied in magnetic hyperthermia therapy of tumor,showing great efficiency in heating for tumor cell inhibition.However,the detailed magnetic hyperthermia properties a... Magnetotactic bacteria(MTB)intact cells have been applied in magnetic hyperthermia therapy of tumor,showing great efficiency in heating for tumor cell inhibition.However,the detailed magnetic hyperthermia properties and optimum heat production conditions of MTB cells are still poorly understood due to lack of standard measuring equipment.The specific absorption rate(SAR)of MTB cells is often measured by home-made equipment at a limited frequency and magnetic field amplitude.In this study,we have used a commercial standard system to implement a comprehensive study of the hyperthermic response of Magnetospirillum gryphiswaldense MSR-1 strain under 7 frequencies of 144-764 kHz,and 8 field amplitudes between 10 and 45 kA/m.The measurement results prove that the SAR of MTB cells increases with magnetic field frequency and amplitude within a certain range.In combination with the magnetic measurements,it is determined that the magnetic hyperthermia mechanism of MTB mainly follows the principle of hysteresis loss,and the heat efficiency of MTB cells in alternating magnetic field are mainly aff ected by three parameters of hysteresis loop,saturation magnetisation,saturation remanent magnetisation,and coercivity.Thus when we culture MTB in LA-2 medium containing sodium nitrate as source of nitrogen,the SAR of MTB LA-2 cells with magnetosomes arranged in chains can be as high as 4925.6 W/g(in this work,all SARs are calculated with iron mass)under 764 kHz and 30 kA/m,which is 7.5 times than current commercial magnetic particles within similar size range. 展开更多
关键词 magnetotactic bacteria(MTB) HYPERTHERMIA rock magnetism alternating magnetic field(amf)
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Submarine Magnetic Field Extrapolation Based on Boundary Element Method
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作者 高俊吉 刘大明 +2 位作者 姚琼荟 周国华 闫辉 《Defence Technology(防务技术)》 SCIE EI CAS 2007年第2期112-116,共5页
In order to master the magnetic field distribution of submarines in the air completely and exactly and study the magnetic stealthy performance of submarine,a mathematic model of submarine magnetic field extrapolation ... In order to master the magnetic field distribution of submarines in the air completely and exactly and study the magnetic stealthy performance of submarine,a mathematic model of submarine magnetic field extrapolation is built based on the boundary element method(BEM).An experiment is designed to measure three components of magnetic field on the envelope surface surrounding a model submarine.The data in different heights above the model submarine are obtained by use of tri-axial magnetometers.The results show that this extrapolation model has good stabilities and high accuracies compared the measured data with the extrapolated data.Moreover,the model can reflect the submarine magnetic field distribution in the air exactly,and is valuable in practical engineering. 展开更多
关键词 电磁学 潜水艇 磁力计 设计
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AN ANALYSIS OF AXISYMMETRIC MAGNETIC FIELD OF LINEAR OSCILLATION MOTOR
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作者 汪玉凤 臧小杰 和乔 《Journal of Coal Science & Engineering(China)》 2000年第2期75-77,共3页
In this paper, using axial field finite analysis method, the field of a movable core type linear oscillation motor is analyzed. The program of axial field finite analysis is worked out. Using this program, we analyze ... In this paper, using axial field finite analysis method, the field of a movable core type linear oscillation motor is analyzed. The program of axial field finite analysis is worked out. Using this program, we analyze various fields, including the field excited by permanent magnet materials, the field by two coils respectively, and the fields with the core moving to various positions. 展开更多
关键词 axial field finite analysis method electric machines linear oscillation motor permanent magnet
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