Study On Lightning Indirect Effects Of The Aircraft And Numerical Simulation

Lightning protection of the aircraft is very important, and some experts have done a lot of research on the lightning test and numerical simulation.Lightning experiments of the aircraft contain lightning attachment zone test and lightning indirect effects test, and attachment zone test requires discharge tests on the whole aircraft, parts or scale model through high voltage equipment.Then simulate different lightning conditions by adjusting the relative position between the aircraft and the electrode, and obtain the lightning attachment zone which is captured by high-speed camera.Lightning indirect effects of the aircraft mainly need to inject low current into the whole aircraft or parts,and get the induced current inside the cable harness by the measuring instruments.The simulation for lightning indirect effects of the aircraft is based on numerical methods which can simulate the lightning attachment zone and indirect effects.Nowadays,the electrostatic field method is often used to simulate the lightning attachment zone.More and more researchers divide the lightning attachment zone by the electric field strength on the aircraft surface obtained by solving the process.However,the rolling sphere method is a geometric algorithm and it needs to determine the appropriate sphere radius to get the accurate lightning attachment zone.In this article,a new 3D geometric topology method is proposed to solve the problem which is based on the shortest breakdown path.Then,we obtain the simulation results by numerical calculation for lightning attachment zone of the aircraft.At the same time,we also examine the simulation results by the electrostatic field method,and find that not only the results based on our new method are broadly consistent with the simulation result based on electrostatic field method,but also the new method has a faster computational speed.In this article,we use method of moment(MoM) which is a frequency-domain electromagnetic numerical methods to simulate lightning indirect effects of the aircraft,and get the accurate results that include the aircraft surface current distribution, the lighting electromagnetic environment and the induced current inside the cable harness by samples of frequency and IFFT. Finally,we analyze and discuss the simulation results, and consider that the results in this article can effectively provide a reference for lightning protection design and testing of the aircraft.