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Valérie Pommier-Budinger

Projets de recherche

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 High Accuracy Pointing System

Investigation and validation of a high accuracy line of sight stabilization system extending the capability of conventional platform AOCS with pointing performances compatible with GEO-HR requirements

Type of project : NPI ESA
Partners : ESA, Airbus DS
Start Date : March 2016

The on-going Fast Steering Mirror (FSM) is nowadays the most exploited device for beam stabilization and optical scanning purposes. It is employed both in terrestrial and Space applications (free space laser telecom systems, interferometric imaging). "High Accuracy Pointing System” is a joint study performed at ISAE and ESA in collaboration with Airbus DS. The objective is to investigate and validate a high accuracy line of sight stabilization system extending the capability of conventional platform AOCS with pointing performances compatible with GEO-HR requirements. The activities encompass the analysis of a high bandwidth 2-dof tip/tilt actuation system, the design and development of control algorithms, the development of a simulator, and the performance assessment on a hardware bench.

 Electromechanical de-icing system

In the context of more electric aircraft, design and control of low consumption de-icing systems based on ultrasonic actuators

Type of project : University of Toulouse
Partners : ICA/INSA, Airbus and Carleton University
Start Date : April 2014

The main idea of the project concerns an electromechanical de-icing system based on resonant actuators (piezoelectric actuators) which should provide some significant advantages over existing solutions : reduce consumption, use only electrical power source, be compatible with any structures (metallic or composite). The concept is based on the activation of piezoelectric actuators to create shear stresses at the substrate/ice interface to promote adhesive fracturesor tensile stress to generate cohesive fractures. The objectives of our work is to understand the initiation and propagation of cohesive fractures in the ice and adhesive fractures at the interface ice/support, to give a methodology for computing voltages and currents of a piezoelectric de-icing system to initiate fractures, and to propose general design rules to favor propagation of fractures.

Some tests to validate our methodology have been performed in the iCORE icing wind tunnel of Airbus Central R&T in Munich. The video shows tests performed on a leading edge covered of glaze ice and excited at 22kHz, 25 kHz and 35kHz with different voltages to study the initiation and the propagation of fractures. The video also shows some results with a plater covered by a icephobic coating.

 Active Flow control

Increase the aerodynamic performance of aircraft by modifying the flow with electromechanical or fluidic actuators.

Type of project : ISAE
Start Date : 2013

The objectives of the project are to design and control of active systems in order to :
- slightly modify the shape of lifting surfaces to increase the stall angle
- or generate vibrations with frequencies near vortices to interfere with them
- or generate high frequency pulsed jets

 ACcTIOM

In the context of future aircraft, design and characterization through flight worthy PIV of a pylon supporting a CROR

Type of project : 7th EU RTD Framework Programme
Partners : Airbus, Aeroconseil
Start Date : January 2011
End Date : July 2016

The objectives of the project are :
- To design of a pylon (with active flow control) supporting an open counter-rotor (CROR)
- To characterize the active pylon in flight with stereoscopic particle image velocimetry (3C-PIV)

 HAMECMOPSYS

Hamiltonian Methods for the Control of Multidomain Distributed Parameter Systems

Type of project : ANR
Partners : Femto-ST, IECN, LAGEP
Start Date : December 2011
End Date : April 2016

One objective of this work is the model and control of coupled fluid-structure systems with piezoelectric actuators using Port-Hamiltonian methods.

MIRHY-Ac

Design and control of an active space mirror with piezoelectric actuators

Type of project : DGA
Partners : SAGEM, Nexeya
Start Date : July 2010
End Date : end of 2013

Issues tackled during the project
- Sizing of active systems based on piezoelectric actuators which meet requirements on surface mass, rigidity (first resonance mode) and deformation (to correct mirror shape defects)
- Optimization of bonding to meet the conflicting constraints of rigidity and deformation
- Control of static nonlinearities (creep and hysteresis)

 SAPES

Structural Health Monitoring of an aircraft wing with embedded piezoelectric transducers

Type of project : DRIRE and Région Midi-Pyrénées
Partners : LATECOERE, CT Ingénierie
Start Date : February 2010
End Date : February 2012

Piezoelectric sensors are widely used for Structure Health Monitoring (SHM) technique. In particular, ElectroMechanical Impedance (EMI) techniques give simple and low-cost solutions for detecting damage in composite structures. The originality of our work is to generate a damage localization map based on both indicators computed from EMI spectrums and Inverse Distance Weighting (IDW) interpolation. The weights for the interpolation have a physical sense and are computed according to an exponential law of the measured attenuation of acoustic waves. One of the main advantages of the method is that only experimental data is used as inputs for our algorithm.

  Reduction of variable tonal noise

Design and control of silencers with tunable resonators for reduction of variable tonal noise

Type of project : DGA MRIS and valorization project
Partners : University of Toulouse
Start Date : May 2008
End Date : December 2013

Acoustic resonators made of perforated sheets bonded onto honeycomb cavities can be used in adverse conditions such as high temperature, dirt and mechanical constraints but are selective in frequency. In case of variable tonal noise, the efficiency is limited if the resonators are not tunable. We developed a design methodology for silencer based on tunable acoustic resonators made of two superposed and identically perforated liners associated with cavities. One liner is fixed and bonded to the cavities and the other liner is mobile. The tunable acoustic resonators are easily tunable and the efficiency of silencer using this technology is highly increased.

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