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结合GJB151A中的测试标准,求解平面波照射下飞行器线束电磁敏感度(electromagnetic susceptibility,EMS)问题。采用时域有限差分法(Finite-Difference Time-Domain,FDTD)求解空间电磁场在线束屏蔽层上产生的感应电流,并将其作为多导体传输线(multi-transmission line,MTL)方程中的激励源[6],计算线缆电磁脉冲响应。该算法可减少网格剖分数目,节省计算资源,适合电大尺寸目标中线束问题的求解。最后,利用该方法分析了飞行器屏蔽效能和电磁脉冲极化方式对线束EMS的影响,得到了电缆设备端感应电压的频率响应特性。计算结果验证了该方法的高效性和可行性。
Combined with the test standard in GJB151A, the electromagnetic susceptibility (EMS) problem of aircraft harness under plane wave irradiation was solved. The induced current generated on the shielding layer of space electromagnetic field by space electromagnetic field is solved by Finite Difference Time-Domain (FDTD) method and used as the excitation source in multi-transmission line (MTL) equation [ 6], calculate the cable electromagnetic pulse response. This algorithm can reduce the number of grids and save the computational resources, which is fit for the solution of the beam in large size targets. Finally, the method is used to analyze the effect of the shielding effectiveness of the aircraft and the electromagnetic pulse polarization on the EMS of the harness, and the frequency response characteristics of the induced voltage at the cable equipment are obtained. The calculation results verify the efficiency and feasibility of the method.