Objectives With the rapid development of space technology, launching aircraft at sea has gradually become a future development trend. Aircraft flying in the atmosphere will sometimes encounter lightning strikes, which can cause damage to airborne equipment.
Methods In response to this issue, two aircraft models (one with a gap and one with no gap) are built. Based on the CST transmission line matrix method, the induced electric and magnetic fields, surface current and induced current distribution of the cables of the two aircraft models are studied. At the same time, the changes in induced current in cables of different lengths are studied.
Results For the same aircraft model, the surface electric and magnetic fields and internal electric and magnetic fields at the same axial position are not only different in induction peak value but also in change trend. The gap has little effect on the surface electric and magnetic fields of the aircraft, but the influence is particularly obvious inside the aircraft. The gap of the aircraft has a great influence on the induced current of the cable. Compared with the model with a gap, the single wire induced current peak of the model with no gap decreased by 1 000 times, and the current peak of the coaxial wire decreased by 15 times.
Conclusions The research results of this paper can provide references for understanding the electromagnetic effect of lightning strikes on aircraft, and the results will be helpful for carrying out the next step in lightning protection work.
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