瞬态电磁场三维时域有限差分模拟研究
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摘要
该文使用三维时域有限差分方法对在不同环境中的0.1～0.1T Hz电磁波场进行数值模拟。以高斯脉冲作为源电流信号研究了导电全空间中电偶极子场,并对海底低阻地质模型的电磁响应做了模拟计算;对隧道含水裂缝异常的回线源瞬变电磁响应进行了分析;对超宽带穿墙探测模型做了模拟计算,进一步在超宽带电磁波与窄带电磁波对钢筋混凝土的探测模拟结果做了对比分析;用FDTD-PIC软件对94 GHz折变回旋振荡管TE6,2模产生过程做了模拟计算,指出模拟中存在的问题,最后对时域有限差分程序的并行做了分析,提出用时域有限差分方法研发回旋管瞬态场三维模拟软件的思路。
Numerical simulations of electromagnetic field of 0.1-0.1T Hz in different circumstance are carried out with 3D-FDTD(three-dimensional finite-difference time-domain). Electric dipole field in the whole conductive space of sea is presented and electromagnetic response of the seabed geological model of low impedance is simulated taking Gauss impulse as current source. Then, transient electromagnetic response of water-filled cracks abnormal in the tunnel to loop-source is analyzed. UWB(Ultra wideband) through-wall detection model is simulated and calculated, and the simulation results of reinforced concrete detection with UWB electromagnetic wave and narrow-band electromagnetic wave are analyzed and compared. More than that, activation of TE6,2 in line-joint cavity of 94 GHz gyrotron oscillator is modeled with MAGIC, and the problems existing in the simulation are presented. Finally, we give a deep analysis on the parallel computing of FDTD program and the idea to develop gyrotron three-dimensional transient field simulation software by using FDTD.
Numerical simulations of electromagnetic field of 0.1-0.1T Hz in different circumstance are carried out with 3D-FDTD(three-dimensional finite-difference time-domain). Electric dipole field in the whole conductive space of sea is presented and electromagnetic response of the seabed geological model of low impedance is simulated taking Gauss impulse as current source. Then, transient electromagnetic response of water-filled cracks abnormal in the tunnel to loop-source is analyzed. UWB(Ultra wideband) through-wall detection model is simulated and calculated, and the simulation results of reinforced concrete detection with UWB electromagnetic wave and narrow-band electromagnetic wave are analyzed and compared. More than that, activation of TE6,2 in line-joint cavity of 94 GHz gyrotron oscillator is modeled with MAGIC, and the problems existing in the simulation are presented. Finally, we give a deep analysis on the parallel computing of FDTD program and the idea to develop gyrotron three-dimensional transient field simulation software by using FDTD.
引文
[1]BOTTON M,THOMAS M,ANTONSEN T M,et al.MAGY:a time-dependent code for simulation of slow and fast microwave sources[J].IEEE Transactions on Plasma Science,1998,26(3):882-892.
[2]NUSINOVICH G S,YEDDULLA M,ANTONSEN T M,et al.Start-up scenario in gyrotrons with a nonstationary microwave-field structure[J].Physical Review Letters,2006,31(3):125101.
[3]雷朝军,喻胜.THz回旋管电子光学系统与渐变谐振腔注波互作用研究[D].成都:电子科技大学,2013.LEI Chao-jun,YU Sheng.Study on electron optical system and beam-wave interaction in tapered cavity for THz gyrotron[D].Chengdu:University of Electronic Science and Technology of China,2013.
[4]吕英华.计算电磁学的数值方法[M].北京:清华大学出版社,2006.LüYing-hua.Computational electromagnetic numerical method[M].Beijing:Tsinghua University Press,2006.
[5]葛德彪,闫玉波.电磁波时域有限差分方法[M].第三版.西安:西安电子科技大学出版社,2011.GE De-biao,YAN Yu-bo.Electromagnetic wave finite difference time domain method[M].3rd ed.Xi’an:Xidian University Press,2011.
[6]王秉中.计算电磁学[M].北京:科学出版社,2002.WANG Bing-zhong.Computational electromagnetic[M].Beijing:Science Press,2002.
[7]张双狮,王绪本.海洋可控源电磁法三维时域有限差分数值模拟[D].成都:成都理工大学,2013.ZHANG Shuang-shi,WANG Xu-ben.Marine controlled source electromagnetic numerical simulation of three-dimensional finite difference time-domain[D].Chengdu:Chengdu University of Technology,2013.
[8]孙怀凤,李貅,李术才,等.考虑关断时间的回线源激发TEM三维时域有限差分正演[J].地球物理学报,2013,56(3):1049-1064.SUN Huai-feng,LI Xiu,LI Shu-cai,et al.Threedimensional FDTD modeling of TEM excited by a loop source considering ramp time[J].Chinese Journal of Geophysics,2013,56(3):1049-1064.
[9]孙怀凤,李术才.隧道含水构造三维瞬变电磁场响应特征及突水灾害源预报研究[D].济南:山东大学,2013.SUN Huai-feng,LI Shu-cai.Three-dimensional transient electromagnetic response of water bearing structures in tunnels and prediction of water inrush sources[D].Jinan:Shandong University,2013.
[10]毛立峰,王绪本.超宽带电磁法正演模拟与反演成像[D].成都:成都理工大学,2007.MAO Li-feng,WANG Xu-ben.The forward simulation and inversion imaging of the Ultra Wide Band electromagnetic method[D].Chengdu:Chengdu University of Technology,2007.
[11]雷朝军,喻胜,李宏福,等.94 GHz缓变结构回旋管设计与数值模拟研究[J].强激光与粒子束,2014,26(2):023002.LEI Chao-jun,YU Sheng,LI Hong-fu,et al.Design and numerical simulation of 94 GHz gyrotron with gradually tapered cavity[J].High Power Laser and Particle Beams,2014,26(2):023002.
[12]张立红,余文华.FDTD算法的三级并行实现[J].计算机工程,2011,37(12):333-335.ZHANG Li-hong,YU Wen-hua.Three-level parallel implementation of FDTD algorithm[J].Computer Engineering,2011,37(12):333-335.
[13]柴什峰,苏晓星.光子晶体带结构计算FDTD方法的GPU实现研究[D].北京:北京交通大学,2015.CAI Shi-feng,SU Xiao-xing.Research on the GPUimplementation of the FDTD method for photonic crystal band structure calculations[D].Beijing:Beijing Jiaotong University,2015.
[2]NUSINOVICH G S,YEDDULLA M,ANTONSEN T M,et al.Start-up scenario in gyrotrons with a nonstationary microwave-field structure[J].Physical Review Letters,2006,31(3):125101.
[3]雷朝军,喻胜.THz回旋管电子光学系统与渐变谐振腔注波互作用研究[D].成都:电子科技大学,2013.LEI Chao-jun,YU Sheng.Study on electron optical system and beam-wave interaction in tapered cavity for THz gyrotron[D].Chengdu:University of Electronic Science and Technology of China,2013.
[4]吕英华.计算电磁学的数值方法[M].北京:清华大学出版社,2006.LüYing-hua.Computational electromagnetic numerical method[M].Beijing:Tsinghua University Press,2006.
[5]葛德彪,闫玉波.电磁波时域有限差分方法[M].第三版.西安:西安电子科技大学出版社,2011.GE De-biao,YAN Yu-bo.Electromagnetic wave finite difference time domain method[M].3rd ed.Xi’an:Xidian University Press,2011.
[6]王秉中.计算电磁学[M].北京:科学出版社,2002.WANG Bing-zhong.Computational electromagnetic[M].Beijing:Science Press,2002.
[7]张双狮,王绪本.海洋可控源电磁法三维时域有限差分数值模拟[D].成都:成都理工大学,2013.ZHANG Shuang-shi,WANG Xu-ben.Marine controlled source electromagnetic numerical simulation of three-dimensional finite difference time-domain[D].Chengdu:Chengdu University of Technology,2013.
[8]孙怀凤,李貅,李术才,等.考虑关断时间的回线源激发TEM三维时域有限差分正演[J].地球物理学报,2013,56(3):1049-1064.SUN Huai-feng,LI Xiu,LI Shu-cai,et al.Threedimensional FDTD modeling of TEM excited by a loop source considering ramp time[J].Chinese Journal of Geophysics,2013,56(3):1049-1064.
[9]孙怀凤,李术才.隧道含水构造三维瞬变电磁场响应特征及突水灾害源预报研究[D].济南:山东大学,2013.SUN Huai-feng,LI Shu-cai.Three-dimensional transient electromagnetic response of water bearing structures in tunnels and prediction of water inrush sources[D].Jinan:Shandong University,2013.
[10]毛立峰,王绪本.超宽带电磁法正演模拟与反演成像[D].成都:成都理工大学,2007.MAO Li-feng,WANG Xu-ben.The forward simulation and inversion imaging of the Ultra Wide Band electromagnetic method[D].Chengdu:Chengdu University of Technology,2007.
[11]雷朝军,喻胜,李宏福,等.94 GHz缓变结构回旋管设计与数值模拟研究[J].强激光与粒子束,2014,26(2):023002.LEI Chao-jun,YU Sheng,LI Hong-fu,et al.Design and numerical simulation of 94 GHz gyrotron with gradually tapered cavity[J].High Power Laser and Particle Beams,2014,26(2):023002.
[12]张立红,余文华.FDTD算法的三级并行实现[J].计算机工程,2011,37(12):333-335.ZHANG Li-hong,YU Wen-hua.Three-level parallel implementation of FDTD algorithm[J].Computer Engineering,2011,37(12):333-335.
[13]柴什峰,苏晓星.光子晶体带结构计算FDTD方法的GPU实现研究[D].北京:北京交通大学,2015.CAI Shi-feng,SU Xiao-xing.Research on the GPUimplementation of the FDTD method for photonic crystal band structure calculations[D].Beijing:Beijing Jiaotong University,2015.