直升机中电磁耦合薄弱路径的确定方法

摘要

For the complex structures, the narrow space and the large quantity of equipments in the helicopter, a complicated electromagnetic environment makes effects in the avionics platform. For the purpose of finding the ElectroMagnetic Interference (EMI) coupling path rapidly, a method for determining EMI coupling path is presented. Based on the minimum electromagnetic attenuation, the EMI coupling network is converted into EMI coupling diagraph. In a specified frequency, Dijkstra algorithm is applied to seek the shortest path between interfering source and victim. Then a weak link of the electronic system will be determined. Based on this method, a simulation of processors and radio system in helicopter is carried out, and the main coupling path is successfully established. Simulation and analysis indicate that the proposed method is able to find out the weak links of electronic system in an effective way and support for the solution of electromagnetic compatibility issues.%直升机结构复杂、空间狭小、设备繁多，从而导致全机电磁环境异常复杂。为了快速定位全机电磁干扰耦合的通道，该文提出一种电磁干扰耦合薄弱路径的确定方法。它通过将复杂电磁干扰耦合网络转换成电磁干扰耦合有向图，以电磁能量衰减量最小为基础，在指定频点处使用Dijkstra算法寻找出干扰源和敏感点之间的最短路径，从而确定电子系统的薄弱环节。使用该方法对直升机某处理机和电台系统进行了仿真分析，并成功地寻找出敏感设备受扰的主要耦合通道。仿真和分析表明该方法可有效地寻找出系统电磁耦合的薄弱环节，并为系统的电磁兼容问题提供支撑。