基于HIRF的航空器机体屏蔽效能仿真研究

Simulation research on aircraft shielding effectiveness based on HIRF

电磁仿真方法是民用飞机高强度辐射场(high intensity radiated fields,HIRF)适航验证的重要方法之一。开展整机级HIRF试验的难度较大,文章借助CST电磁仿真软件对某型号直升机机体模型进行屏蔽效能的仿真研究,得到机体不同位置处的屏蔽效能,并将仿真结果与已开展的某型号直升机试验结果进行对比,发现两者规律具有较好的一致性。仿真研究结果表明:直升机机体的屏蔽效能在不同极化、不同机体结构和不同辐照方向下的变化规律不同,缝隙结构是电磁能量进入机体的主要途径。所得结论可为国内开展航空器HIRF仿真研究提供参考。

The electromagnetic simulation method is one of the important methods for civil aircraft high intensity radiated fields(HIRF)airworthiness verification.The aircraft-level HIRF test is difficult to carry out.In this paper,simulation research on the shielding effectiveness of a certain type of helicopter airframe model is conducted with CST electromagnetic simulation software,which can obtain the shielding effectiveness of different positions of the airframe.The simulation results are compared with the results of the test of a certain type of helicopter that has been carried out,and it is found that the two rules have a good consistency.The simulation research results show that the shielding effectiveness of the helicopter airframe is different under different polarizations,different airframe structures and different irradiation directions.And the aperture structure is the main way for electromagnetic energy to enter the airframe.The conclusion provides reference for HIRF simulation research of aircraft in China.