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Ebermannstadt, Germany

Rasek G.A.,EMCCons DR. RASEK GmbH and Co. KG | Schroder A.,University of Bern | Tobola P.,Evektor | Reznicek Z.,Evektor | And 3 more authors.
IEEE Transactions on Electromagnetic Compatibility | Year: 2015

HIRF transfer functions results are rarely available to the public. Generally, the data provided in applicable guidance material are used for estimation of internal HIRF environment in an air vehicle. An exemplary set of HIRF transfer functions for a small aircraft is presented here. Results for the aircraft (10.4-m wingspan and 8.3 m of length) are compared with regard to state of the art approaches applied for aircraft HIRF certification campaigns. This is done in appropriate frequency ranges and by the use of applicable test methods with regard to requirements in place. For all major types of contemporary test methods, results are generated by measurement and numerical computer modeling. Principles of outcomes are discussed and compared to current practice in place. This concerns the shapes of the transfer functions on one hand and the order of magnitudes of obtained levels on the other hand. The obtained results show significant deviations from generic transfer functions currently applied in aircraft industry. The coupling to the interior of the aircraft observed here was higher than indicated by the applicable generic transfer functions. Numerical computer modeling is used here to verify the obtained outcomes by principle. © 1964-2012 IEEE. Source


Schroder A.,TU Hamburg - Harburg | Rasek G.A.,EMCCons DR. RASEK GmbH and Co. KG | Bruns H.-D.,TU Hamburg - Harburg | Reznicek Z.,Evektor | And 3 more authors.
IEEE Transactions on Electromagnetic Compatibility | Year: 2014

In this paper, electromagnetic effects arising from high intensity radiated fields (HIRF) within realistic aircraft structures are investigated using the method of moments (MoM) and experimental tests. This study focuses on simulation-to-measurement correlation, where two potential error sources are investigated: Accuracy of the numerical techniques and the generation of numerical models. It is shown that the conventional mixed potential electric field integral equation may lead to inaccurate results regarding the field penetration through apertures. An alternative integral equation is introduced which splits the computational domain into an interior and an exterior domain, improving the results for aperture problems. To analyze the accuracy and the range of applicability for these integral equations, a generic aircraft structure is investigated, both numerically and experimentally. Thereby, various modeling aspects required for a meaningful simulation of aircraft are discussed. Following these observations, a real aircraft is analyzed in a broad frequency range from 10 kHz to 1 GHz. It is demonstrated that accurate numerical techniques are as important as modeling and appropriate simplification of the considered structures. © 2013 IEEE. Source


Rasek G.A.,EMCCons DR. RASEK GmbH and Co. KG | Gabrisak M.,EMCCons DR. RASEK GmbH and Co. KG
Proceedings of 21st International Conference, Radioelektronika 2011 | Year: 2011

The operating environment of aircraft is characterised by relevant Radio Frequency (RF)-fields. The potential RF exposure of aircraft is commonly called the High Intensity Radiated Fields (HIRF) environment. Aircraft functionality in the HIRF environment is a necessity to reach certification. One effect when operating in the HIRF environment are RF cable bundle and wire currents inside the aircraft. Prior to installation of avionics inside an aircraft this potential threat is tested on equipment and system level via the Bulk Current Injection (BCI) technique. The BCI technique is a substitution method. The conducted injection is used to generate the RF currents on the cable bundles and wires directly. The development of the BCI technique and associated test levels over the last years are discussed in the present paper. In particular the RF current generated with the BCI technique is compared to the one during RF field exposure. A comparison to results for Indirect Effects of Lightning (IEL) is provided. © 2011 IEEE. Source


Rasek G.A.,EMCCons DR. RASEK GmbH and Co. KG | Pascual-Gil E.,Airbus | Schroder A.,TU Hamburg - Harburg | Junqua I.,ONERA | And 4 more authors.
IEEE Transactions on Electromagnetic Compatibility | Year: 2014

An entire set of high-intensity radiated field transfer functions including the main types of contemporary test methods is presented. Consequently, the applied frequency range for this task expands over many decades, from the kilohertz range up to 40 GHz. A major aim is to demonstrate the application of numerical computer modeling for such a task. Results of measurements and various solvers are compared to each other. As the activity serves also for the validation of such applications, the scenario is investigated by the use of a fuselage model with limited complexity. © 1964-2012 IEEE. Source


Rasek G.A.,EMCCons DR. RASEK GmbH and Co. KG | Loos S.E.,EMCCons DR. RASEK GmbH and Co. KG | Neubauer M.,EMCCons DR. RASEK GmbH and Co. KG | Junqua I.,ONERA | And 2 more authors.
Proceedings of the 2012 ESA Workshop on Aerospace EMC 2012 | Year: 2012

In an anechoic chamber and in a reverberation chamber Radio Frequency (RF) fields are generated to illuminate a fuselage model. The fields coupled into the fuselage model are assessed. This is done by measurement and numerical computer modelling. For the numerical computer modelling fundamentally different approaches are applied with entirely independent model generation. The experimental and numerical results for the two different RF Environments are provided and compared. Aim is to characterize both RF environments for a radiated transfer function task and compare experimental and different numerical results to each other. © 2012 ESA. Source

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