非核电磁脉冲在坑道中的传播

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。

Propagation of non-nuclear electromagnetic pulse in tunnel

T o invest ig ate the pro pagat ion of no n-nuclear electr omagnet ic pulse ( EMP) in circular tunnel, a numerical analy sis model w as put forw ard based on the bo dy of revolut ion finite-dif ference t ime-domain ( BOR-FDT D) metho d. The propagat ion loss of high-pow er microw ave ( HPM) w ith dif ferent carrier frequencies and ult ra-w ide band ( UWB) w ith dif ferent pul se w idths w ere achieved for three t ransmitt ing modes ( TE01 , T E11and T M01) using the BOR-FDT D numerical mo del. T he result s indicate that the pro pagat ion loss of no n-nuclear EMP in tunnel is mainly clo se to linear at tenuat io n, while in the pr opag ation pr ocess the at tenuation has obvious fluctuation for HPM with hig her carrier f requency , that the higher the carr ier f requency of HPM, or the narrow er the pulse width of UWB, the less the propagat ion loss, and that the at tenuat ion r ate o f TM01 mode is higher than that o f the TE01 and T E11 modes. T he numerical result s are in goo d ag reement w ith tho se o btained fr om the ex periment