Validation procedure of low level coupling tests on real aircraft structure

Abstract

This paper describes the analysis of the experimental test results obtained during the low level swept coupling (LLSC) and low level direct drive (LLDD) tests on FALCON 7X horizontal tail plane provided by EADS-CASA. These techniques are evaluated during the aircraft high intensity radiated field (HIRF) certification process and in the scope of European Community's FP7 HIRF SE project. The analysis of low level test results shall be performed to estimate the influence of the test setup with particular regard to the in-flight coupling configuration. For this reason, finite difference time domain (FDTD) 3D computations have been used to determine the relationship between free field external radiation and skin current in different illumination angles and polarizations. Finally, after validation by comparison of the measured and computed skin current, measured bundle current are related to measured skin currents, to provide the transfer function link to the external field.Keywords-electromagnetic compatibility (EMC); aircraft; low level swept current (LLSC); low level direct drive (LLDD); high intensity radiated field (HIRF); finite difference time domain (FDTD); validation; skin currents; coaxial return.

Influence of Geometric Simplifications on High-Intensity Radiated Field Simulations

“…It was developed by UGR in collaboration with Airbus Defence and Space within several research and technology projects [18,19]. It is especially suited to deal with HIRF/Lightning electrically-large EMC problems [7,[20][21][22][23], and can account for complex structures, materials, cables, composite thinpanels, etc.. Further information about thin-panel and thin-wire formulation can be found in [24,25] and [9,17,26] respectively. A variety of output data can be obtained including the electric current and voltage transient profiles stressing electric/electronic equipment considered in this study.…”

Computational Modelling for Dish-to-Dish Coupling Investigations on Meerkat Telescope

“…Low level radiated fields associated with currents on cable structures of the MeerKAT dish could cause interference to other nearby telescope systems. Industries such as aeronautics that also deal with sensitive systems prefer low level RF coupling test methods during EMC tests related to certification and qualification of air vehicles [18]. In our measurements we use known radiator fields which result in induced currents on the RI cables of the actual MeerKAT antenna.…”

“…A similar idea has been utilized in complex and electrically large structures but within the structure itself, e.g. in-flight coupling configurations in aeroplanes [16][17][18]. In this paper we present MeerKAT to MeerKAT EM coupling investigations with special interest in the qualification of cabling and shielding around the receiver indexer (RI).…”

Electromagnetic Environmental equivalence: An optimisation approach

“…The answer to this question is that LLDD is one of the few techniques that can stress the aircraft below the fust airframe resonance without the associated signal-to-noise problems. It therefore provides a stress condition for aircraft where interpolation is considered inadequate 978-1-4673-8548-0/15/$31.00 ©2015 Crown ED 1 07 A [1] describes an approach based on current magnitudes that can be used to correct LLDD test cable current data into the equivalent HIRF cable current given an external electromagnetic environment, see [6] for an example of the use of the ED 1 07 A approach.…”