Component-Based Simulation for Real-Time Experiments of Advanced Aerospace Systems


B. Hérissé, G. Hervieux, K. Dahia, J.-M. Allard, J.-C. Sarrazin (ONERA)

This paper presents recent advances at ONERA in simulation engineering. Simulation is used for many purposes, from performance evaluation of algorithms to realistic emulation of the real world, including real components such as humans. To design general and scalable simulation software, a flexible architecture needs to be designed. A component-based architecture approach that allows multilevel capitalization and high collaborative sharing between systems experts and computing experts has been developed at ONERA.

Surrogate Models for Aircraft Flight Control: Some Off-Line and Embedded Applications


J.-M. Biannic, G. Hardier, C. Roos, C. Seren, (ONERA)
L. Verdier (AIRBUS Operations SAS, EGYA)

The use of surrogate models is now very widespread in engineering activities to replace high-fidelity models, computation codes or simulators that are too complex or time consuming. This is especially the case in the aerospace field: although physical models are available, derived from aerodynamics, structural dynamics or flight mechanics, quite often they cannot be used just as they are.

Dealing with Complexity through Advanced Control Techniques


P. Bidaud, L. Burlion, H. De Plinval, T. Loquen, J. Marzat, C. Pralet (ONERA)

The control of complex dynamic systems, both in their behavior and in their mission, goes through the implementation of multi-loop control architectures based on information about the system internal state and from the environment, as well as on the mission plan state. This results in systems that are becoming increasingly autonomous, for which requirements in terms of safety and reliability, as well as expected performance, are increasingly high.

Radiation Testing of Electronics Systems: How Can Simulation Tools Help in the Definition and Optimization of Test Plans in Labs?


S. Duzellier, J.P. David, C. Inguimbert, T. Nuns, G. Hubert, L. Artola (ONERA)

On-board space systems are exposed to harsh environmental conditions including radiations, extreme temperatures and high-vacuum… Each component of this space environment, either separately or in synergy, induces short or long term degradation of electronics or materials, thereby impacting reliability.

Gravitation and Geodesy with Inertial Sensors, from Ground to Space


P. Touboul (ONERA)
G. Métris (Geoazur – CNRS/UMR)
H. Sélig (ZARM Space Science Department University of Bremen)
O. Le Traon, A. Bresson, N. Zahzam, B. Christophe, M. Rodrigues (ONERA)

Since the years 2000, three space missions, CHAMP, GRACE, and GOCE, have led us to consider the Earth's gravitational field and its measurement in a new light, using dedicated sensors and adequate data processing, revealing the changes in the Earth's field as the true signal rather than the disturbing terms in addition to the geostatic reference field.

Ro-Vibrational Spectroscopy in Hybrid fs/ps-CARS for N2 Thermometry


M. Nafa (ONERA / Institut UTINAM, UMR CNRS 6213)
M. Scherman, A. Bresson, A. Aubin, A. Godard, B. Attal-Tretout (ONERA)
P. Joubert (Institut UTINAM, UMR CNRS 6213)

Ro-vibrational CARS spectroscopy is performed on the Q-branch of N2 in the hybrid fs/ps regime. A new optical setup has been mounted using a single laser source and a spectral filtering stage based on a volume Bragg grating and a Fabry-Perot etalon, in order to achieve a good enough resolution. CARS spectra are recorded in ambient air at a 1 kHz repetition rate. However, a CH4 /air flame is probed at 2 Hz, in order to obtain a strong enough signal to enable thermometry.

Experimental Fluid Mechanics goes 3D: New Numerical Methods for Quantitative Instantaneous 3D Imagery of Fluids


G. Le Besnerais, F. Champagnat, P. Cornic, A. Plyer, B. Leclaire, A. Cheminet, C. Illoul, G. Losfeld, Y. Le Sant, D. Donjat, F. Nicolas, F. Micheli (ONERA)

We review recent developments made between three departments at ONERA (DTIM, DAFE, DMAE) with regard to 3D imagery used in fluid mechanics experiments. We first discuss 3D PIV (Particle Image Velocimetry) and present  original contributions on the modeling of the imaging process, the reconstruction of the 3D volume of particles and the estimation of the 3D motion field between two time instants.

Doppler LIDAR Developments for Aeronautics


C. Besson, A. Dolfi-Bouteyre, G. Canat, N. Cézard, B. Augère, A. Durécu, L. Lombard, M. Valla, A. Hallermeyer (ONERA)

Detecting atmospheric hazards such as wake vortices, turbulences, wind shear or wind gusts would improve flight and airport traffic safety. Moreover, to face the current and future challenges of air traffic growth in terms of environment, safety and costs, one of the major challenges is to increase runway throughput by optimizing the distance separation between aircraft. These are some of the issues, among others, addressed by Doppler LIDARs.

Planar Particle Image Velocimetry for Aerospace Research at ONERA


B. Leclaire, C. Brossard, R. Courtier, F. David, S. Davoust, A. Gilliot, L Jacquin, J.-M. Jourdan, O. Léon, S. Masseboeuf, J.-C. Monnier, S. Mouton, E. Piot, A. Ristori, D. Sebbane, F. Simon (ONERA)

Planar Particle Image Velocimetry (PIV) is a measurement technique that yields the instantaneous spatial structure in a planar cut of a flow. It exists in several forms (two-component, three-component or Stereo, and time-resolved), all of which are now considered to be mature, and as production tools for flow investigation in experimental facilities.

Testing in Aerodynamics Research at ONERA: the Example of the Transonic Buffet


L. Jacquin, V. Brion, P. Molton, D. Sipp, J. Dandois, S. Deck, F. Sartor, E. Coustols (ONERA)
D. Caruana (ISAE)

The paper reviews research conducted at ONERA over the last thirty years on the transonic buffet. We first present the transonic buffet phenomenon and we explain its importance for aeronautical applications. Then, a distinction is made between the 2D buffet produced by an airfoil and the 3D buffet that characterizes swept wings of finite span.