COMSOL solutions to EMI hardening of UAVs against lightning strikes

In this paper, COMSOL Multiphysics software is used to simulate lightning impulse applied to nose, wings, and fuselage of unmanned aerial vehicles (UAVs). Based on that, the electric field levels at different points inside the UAV are computed. Real-world 3D model of UAV is created using SOLIDWORKS software. Since the impulse has no single frequency, the model is used in the time domain to simulate the lightning strike. Furthermore, hardening the UAV to reduce electromagnetic interference (EMI) by shielding against lightning strikes is examined. The results confirm that an overlay of good electric conductor can essentially prevent lightning strikes from entering the UAV, even when necessary narrow seams and holes are not shielded. To show the validity and usefulness of the model, the computed results are compared with measured data where acceptable agreement is observed.