Electromagnetic topology analysis: small apertures and lightning interactions

An electromagnetic topology based simulation code has been used to characterize interactions through a small aperture of a semi-shielded electrical system to external lightning. A transfer function for the external-internal interactions for the topological model was first determined and then applied to a cable network for electrical lightning effect studies. The results are comparable to experimental measurements. It is shown that, for a cable inside an aircraft, the effects of the external fields on the cable current depends on the cable length, location, driving voltage and the impedances at the terminals.