Abstract
This work presents a modeling/simulation approach of BCI (Bulk Current Injection) test under constraint RTCA - DO 160. This qualification test of equipment is very constraining in terms of cost and deadline. During the test, there are also many disparities for which it is difficult to identify sources (and control them) with a physical test setup. The simulation is of interest in the study of phenomena (which can have negative impacts on test results) but also the repeatability of tests.First, a method of modeling for the probe/cables coupling is established which takes into account the variation with frequency of the RF transformer (current probe) of the magnetic ferrite core and the linear parameters of cables (skin/ proximity effects). Two models are proposed in this work:- A generic model which is made up solely of passive elements RLC and elaborated (with SPICE software) from the measurement of S-parameters. It shows the coupling zone between probe and cables (secondary winding).- A magnetic macro-model developed with the Flux2D software. Its geometrical parameters are defined from dimensions of the probe (inner/outer diameter, length) and cables (diameters / length). Physical parameters of the current probe, particularly the complex magnetic permeability of the ferrite core, are obtained from measurement of the S-parameter at the input port of the probe and post-treatment extraction.Frequency domain validations were performed with a good correlation between simulations and measurements in the BCI band ([10 kHz - 400 MHz]).These results led to the development of a complete virtual BCI test (with PAM-CEM / CRIPTE software), which take into account an aeronautic complex harness and a DUT (Device Under Test which is modeled at Ampère laboratory). It consists of disturbance generator, harness model (consisting of shielding twisted cables, no shielding cables, etc.) and DUT (Device Under Test) in the band [10 kHz - 400 MHz].The good correlation between simulations and measurements suggests a use by the aircraft manufacturers or equipment manufacturers for parametric studies about BCI test (uncertainties related to cable positions, pigtail, cable length, DUT position with respect to the ground plane, ...) and /or for virtualization in a pre-qualification phase of the equipment.Keywords: EMC (ElectroMagnetic Compatibility), BCI (Bulk Current Injection) test, Modeling/Simulation, DO 160 aeronautic standard.