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Brive-la-Gaillarde, France

Tristant F.,Dassault Aviation | Fustin F.,Dassault Aviation | Terrade F.,Dassault Aviation | Roussel M.,Dassault Aviation | And 6 more authors.
IET Seminar Digest | Year: 2015

The evolutions of the Certification Specifications CS 25.954 [1] and CS 25.981 [2] and associated policy [3] [4], change the justification to prevent catastrophic fuel vapour ignition due to lightning. This change results in carrying out many tests for all arrangement and design taking into account manufacturing escape, accident and aging: the "fault tolerant approach". The new type of computations is now part of the assessment to justify the current distribution in the arrangement of fuel tank and the design of the samples used for conduction and attachment tests. This paper presents the methodology applied by Dassault Aviation to quantify the current distribution for conduction and attachment problematic. Important efforts have been performed - to validate computation by dedicated tests - and to increase technical collaboration with DGA-TA thus making it possible to specify the test set-up and samples with a better understanding of lightning strike distribution produced on the Airplane. The first application concerns 3D computations at aircraft level for conduction aspect, to quantify the current distribution for all arrangements depending on many parameters like: location, type of assemblies, families of fasteners, etc. These computations are more and more reliable to specify the injected current level during the test on samples and to estimate the waveform (rise-time for example). Indeed, for conduction aspect, 3D computations are performed at aircraft level integrated a few thousands of individual fastener joints to quantify the lightning threat levels for each fastener family and each aircraft zones. This work is presented in a dedicated paragraph. For attachment aspect, the same computations are also used to quantify the current on the skin versus the internal current on the stiffener / rib / spar. For metallic, composite or hybrid arrangements, the test set-up could be adjusted to reproduce these distributions. This work requires an important collaboration in terms of computation and measurements with DGA-TA to understand, to optimize and to simplify the methodology if necessary. © 2015, Institution of Engineering and Technology. All rights reserved.

Desrumaux L.,XLIM OSA | Lalande M.,XLIM OSA | Andrieu J.,XLIM OSA | Bertrand V.,CISTEME | Jecko B.,University of Limoges
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2011

This paper proposes two studies on a Shark antenna array, working in the frequency band [800MHz - 8GHz], in a configuration including N generators and N antennas. The first study deals with the evaluation of the performances of the array from the analyze of the transient performances of the elementary system "generator + antenna". The second study concerns the comparison of two arrays having the same surface area, but a different number of antennas thanks to a scaling method on the dimensions of the elementary antenna. © 2010 SPIE.

Desrumaux L.,XLIM OSA | Lalande M.,XLIM OSA | Andrieu J.,XLIM OSA | Bertrand V.,CISTEME | Jecko B.,University of Limoges
EuCAP 2010 - The 4th European Conference on Antennas and Propagation | Year: 2010

This paper is dedicated to an original miniature antenna for transient Ultra Wide Band applications: the Shark antenna. This antenna is well matched from 800MHz up to 8GHz, has a sectoral transient radiation pattern, has a high transient front to back ratio, and is dedicated to be used in an array with an N generators / N antennas architecture. This paper presents the design and the characteristics of this antenna.

Desrumaux L.,XLIM OSA | Vauchamp S.,XLIM OSA | Bertrand V.,CISTEME | Couderc V.,University of Limoges | And 2 more authors.
European Microwave Week 2010, EuMW2010: Connecting the World, Conference Proceedings - European Wireless Technology Conference, EuWiT 2010 | Year: 2010

This paper proposes a miniature antenna array for impulse Ultra Wide Band applications. The elementary antenna is well matched from 300MHz up to 3GHz and is dedicated to be used in an array with an N generators / N antennas architecture. This paper presents the characteristics of the elementary antenna and the array, which are obtained by transient measurements. © 2010 EuMA.

Desrumaux L.,XLIM OSA | Godard A.,XLIM OSA | Lalande M.,XLIM OSA | Bertrand V.,CISTEME | And 2 more authors.
IEEE Transactions on Antennas and Propagation | Year: 2010

A novel ultrawideband (UWB) antenna, called the Shark antenna, and designed especially for transient applications is proposed in this paper. A Shark antenna array is also conceived in order to obtain a high power UWB pulse radiation source through the frequency band [800 MHz-8 GHz]. For this application, the elementary antenna must be compact, non-dispersive, and the array must have a high transient front to back ratio. The geometry of the Shark antenna and its radiation characteristics are detailed. Moreover, an approach which evaluates the transient front to back ratio of a square array is presented. © 2006 IEEE.

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