基于FDTD/MTL 混合算法求解飞行器线束电磁敏感度

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。

Application of Hybrid FDTD/MTL Method to Simulation EMS of Cable Harness on Aircraft

Based on GJB151A, this paper analyzed electromagnetic susceptibility of cable harness excited by plane wave.The Finite-Difference Time-Domain method is used to calculate the induced current of cable shielding layer generated byspatial electromagnetic field. In this problem, the current is considered as an excitation source in multi-transmission line (MTL)equation while computing its impulse response. This method could effectively decrease mesh number and save computingsource. As a result, it can be applied to calculate problems of cable harness in electrically large objects. Finally, the shieldingeffectiveness of aircraft and the effect of electromagnetic impulse polarization mode on EMS of cable harness are analyzed withthis method. Frequency response function of the induced voltage on cable device is obtained. Numerical results thatdemonstrate the validity and efficiency of the proposed scheme are presented in this paper.