SALUTE (Smart Acoustic Lining for UHBR Technologies Engines) is a research project funded by the European Union's Horizon 2020 research and innovation programme Clean Sky 2 Joint Undertaking. It aims at developping innovative acoustic treatments for engine nacelles in order to reduce noise pollution of future aircrafts.
The main technological objective is the development of a new generation acoustic liner, based on the Electroacoustic Absorber concept (see eg. INTERACTS or ENOVAL projects pages). Most of the work will then be a follow-up of FP7-ENOVAL project.
Tasks of EPFL-LTS2
Being a follow-up of the FP7-ENOVAL project, aiming at upgrading the concept of active acoustic liner developed in this former project, EPFL-LTS2 will be involved in the whole technical tasks of the project, with a particular focus on:
- identify electroacoustic hardware (loudspeaker, microphones adapted to very high sound pressure amplitudes) for the concept to be validated at engine level;
- develop novel active impedance control strategies, such as
- Multiple Degrees of Freedom (MDOF) resonators synthesis (order >3), allowing outperforming existing passive solutions (DDOF Helmholtz resonators)
- hybrid feedback/feedforward control on pressure and velocity to extend the possibility of modifying the acoustic impedance of a loudspeaker membrane
- distributed impedance control over the surface of active elements,
- develop numerical simulations accounting for the whole physics (flow duct acoustics, fluid/structure interactions, electromechanical coupling, electric control schemes, etc.);
- develop working prototypes for different validation steps:
- 2D prototype for assessment in rectangular wind-tunnel test facility at NLR
- 3D (curved) prototype for assessment in engine nacelle scale model
More information on the Project's Public Webpage.