EMA3D is a powerful 3D numerical solution of Maxwell’s curl equations based on the time-domain finite-difference method in rectangular coordinates. The code has application to nearly any EM coupling, radiating, or interaction problem.
MHARNESS models can contain multiple conductors, multiple shields, and multiple branches to capture the actual cable routing of real buildings, vehicles, aircraft and spacecraft. Each branch segment can contain multiple layers of shields, wires and conductors—all immersed in a variety of respective media.
A custom verion of CADfix from ITI Transcendata is part of the EMA3D suite of tools. CADfix can import all major CAD formats, defeature, repair the model, and add EM feautres before performing meshing operations required for simulation.
EMA has integrated a range of proven simulation technologies and CAD manipulation tools into a single framework. This combined with parallel algorithms and increases in computational performance give the ability to model electromagnetic environmental effects events on entire vehicles or facilities down to individual electronics interface pins.
In recent years, full-wave electromagnetic simulation of environmental effects has matured to the point that it is accepted for determining component test levels and internal environments.
A CAD-derived electromagnetic model of the facility or vehicle is constructed, and the internal E- and H-field environment along with currents flowing on cables is determined. This results in a significant cost savings over a full-scale test, and the amount of margin necessary is orders of magnitude lower than using a generic handbook or standard value because it is based on the actual geometry of interest.
This internal environment is used in the final certification testing of individual components, which is customized for each component’s expected conducted and radiated threat level.
EMA3D is listed in the SAE Aerospace Recommended Practices guidelines as a method of determining component level lightning indirect effects transients (ARP 5415) and high intensity RF conducted and radiated transients (ARP 5583). The simulation results become the basis for individual component testing.
The EMA approach is becoming common for lightning and high intensity RF qualification for FAA, NASA, and DoD qualification programs.
