Low Frequency Modelling

We have a substantial low frequency modelling capability and experience in the modelling of low frequency electromagnetic phenomena. These include power frequencies and transient analysis of ship power supplies and the ingress of fields into compartments. This analysis can be undertaken by either commercial codes or in-house solvers such as finite-element and finite-difference time-domain packages in two and three dimensions. Amongst successful simulations is that of the current flow through a carbon fibre lap joint - see pictures. The upper picture shows the current flow in a panel assembly without metallic fasteners whereas the lower picture clearly shows the influence of these structures when present in the joint region.

The FDTD solver developed in house is very versatile and as well as being able to handle current diffusion through non-metallic conductors such as carbon fibre, it can be used for other low frequency phenomena such as electrostatic discharge, circuit board coupling due to radiation of clock pulses and many others.