非核电磁脉冲在坑道中的传播  

Propagation of non-nuclear electromagnetic pulse in tunnel

作　　者：段艳涛[1] 陈彬[1] 陈海林[1] 

机构地区：[1]解放军理工大学工程兵工程学院,江苏南京210007

出　　处：《解放军理工大学学报（自然科学版）》2010年第2期147-151,共5页Journal of PLA University of Science and Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(60671007)

摘　　要：为了研究非核电磁脉冲在坑道中的传播规律,基于旋转对称时域有限差分法建立了圆形截面坑道的数值分析模型,以圆波导中TE01模、TE11模和TM01模作为激励模式,计算了不同载频的高功率微波和不同脉宽的超宽带电磁脉冲的衰减。结果表明:非核电磁脉冲随着传播距离的增加,衰减基本上是线性变化的,但在传播过程中,载频较高的高功率微波衰减上下起伏比较明显;高功率微波的载频越高,超宽带电磁脉冲的脉宽越窄,波的衰减量越小;TM01模激励较之TE01模和TE11模激励时脉冲的衰减要大。对数值计算结果和试验数据进行了比较,二者吻合较好。To investigate the propagation of non-nuclear electromagnetic pulse （EMP） in circular tunnel, a numerical analysis model was put forward based on the body of revolution finite-difference time-domain （BOR-FDTD） method. The propagation loss of high-power microwave （HPM） with different carrier frequencies and ultra-wide band （UWB） with different pulse widths were achieved for three transmitting modes （TE01, TE11and TM01） using the BOR-FDTD numerical model. The results indicate that the propagation loss of non-nuclear EMP in tunnel is mainly close to linear attenuation, while in the propagation process the attenuation has obvious fluctuation for HPM with higher carrier frequency, that the higher the carrier frequency of HPM, or the narrower the pulse width of UWB, the less the propagation loss, and that the attenuation rate of TM01 mode is higher than that of the TE01 and TE11 modes. The numerical results are in good agreement with those obtained from the experiment.

关 键 词：电磁脉冲 坑道 时域有限差分法 传播 

分 类 号：TN011[电子电信—物理电子学] TM153[电气工程—电工理论与新技术]