基于线模型的复合材料飞机接地网建模与仿真

飞机接地网承担着提供电流返回路径、雷电防护、电磁屏蔽等重要功能，是影响飞机安全稳定运行的重要因素之一。相比于传统飞机的金属机身，飞机机体中复合材料的大量使用，已经使得飞机复合材料区域内的接地网结构发生了改变。为了能够准确量化分析复合材料飞机接地网内的电流分布，通过使用线模型等效代替复杂的接地网结构元件，并基于该线模型搭建了复合材料飞机接地网结构。通过在该结构上注入电流，分析电流频率、蒙皮与接地网结构间的连接材料对接地网结构上电流分配的影响。仿真结果表明，对于大型复合材料飞机接地网结构，在一定频率之前，接地网结构上的电流分配受制于电阻效应，当频率超过一定限值时，接地网结构上的阻抗会大于复合材料蒙皮阻抗，电流分配受制于电感效应。

Modeling and Simulation of Composite Aircraft Grounding Grid Based on Wire Model

Aircraft grounding grid is responsible for some important functions,such as providing current return path, protecting aircraft from lightning, and electromagnetic disturbance.Its good performance is an important factor affecting the safe and stable operation of aircraft. Compared to the metal fuselage of conventional aircraft, the extensive use of composite materials in aircraft fuselage has led to changes in the grounding grid structure within the aircraft composite area. In order to analyze the current distribution in the composite aircraft grounding grid accurately, the complex grounding grid structure elements is replaced by the wire model, and the structure of composite aircraft grounding grid is built based on the wire model.By injecting current into the structure, the influence of current frequency, connecting material between skin and grounding grid structure on current distribution of grounding grid structure is analyzed.The simulation results show that for large composite aircraft grounding grid structure, before a certain frequency,the current distribution on the grounding grid structure is subject to the resistance effect, when the frequency exceeds a certain limit, the impedance on the grounding grid structure will be greater than the composite skin impedance, and the current distribution is subject to the inductance effect.