Flight test easy extension

Flite2 is an extension of flite e!2419.
1/by completing the transfer of results from flite to aircraft manufacturers. 2/ by introducing new topics not considered in flite, but relevant to flight test analyses.

The development of new aircraft requires a careful exploration of the dynamic behaviour of the structure subject to vibration and aero-elastic forces. This is achieved via a combination of ground and in-flight tests. The former FLITE project ( has provided results improving the use of flight-test data in two ways. Firstly, techniques have been developed for performing tests under natural excitation conditions, without controlled excitation. Secondly, algorithms and prototype software have been developed for on-line processing of data. Nevertheless, important work remains to be done to achieve an in-depth transfer to aircraft manufacturers and an enhancement of in-house tools with new FLITE techniques. Achieving such integration is the first major objective of FLITE2. To ease this transfer at AIRBUS FRANCE, ONERA/DCSD, a regular partner of AIRBUS FRANCE, has been invited to join FLITE2. Secondly, flutter analysis will be a special focus of FLITE2. Whereas structural analysis in general has driven the main efforts of FLITE, it was found that special efforts should be devoted to flutter onset rapid detection and flutter margin prediction. This is thus a new focus of FLITE2. A third objective is to complement the algorithmic studies of FLITE in structural analysis by providing the following enhancements, apart from algorithms: to have efficient techniques for estimating confidence bounds, the assessment of sensor pools for structural identification, and the impact of new sensor technologies on algorithmic procedures. These advances will be made possible thanks to the sound experience gained by the former FLITE project and its participants regarding: 1. Flight test procedures and aircraft manufacturer expertise (AIRBUS, DASSAULT-AVIATION, PZL, ILOT), 2. Expertise in structural and aero-elastic analyses (ONERA, LMS, SOPEMEA, VUB, AGH), and 3. Expertise in algorithmic techniques from control and mechanical engineering (INRIA, KUL, VUB, ONERA, AGH). Regarding tools that can support the results of FLITE2, the following comments can be made: 1. Each aircraft manufacturer possesses its own in-house toolset to support in-flight test analyses; 2. LMS is a worldwide leader in high-tech engineering and solutions marketing for structural analysis and has developed marketed products involving results from FLITE; 3. INRIA and AGH both develop free software packages containing results from FLITE; 4. In general, each academic partner has developed a set of software modules implementing the different algorithms. All the software listed under 2,3,4 has been and will be further provided to aircraft manufacturers for evaluation. But special effort will be undertaken to ensure proper enhancement of category 1 software with results from the FLITE and FLITE2 projects. Keywords: vibrations, flight tests, air transport.
Project ID: 
3 341
Start date: 
Project Duration: 
Project costs: 
3 600 000.00€
Technological Area: 
Aircraft technology
Market Area: 
Airlines, Aircrafts, Aerospace

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