Acoustical propagation and materials with flow

This research operation brings together a range of activities linked to the study of sound-flow interactions. These activities cover propagation in complex flows, acoustic treatment, whistling and energy transfer from flow to acoustics, for example. The team's skills range from experimental characterization and numerical and analytical modeling to the development of new sub-wavelength concepts.

Analytical and numerical skills

• Multimodal methods in uniform and sheared flows, including pseudo-spectral and “mode-matching” methods.

• Transfer matrix methods to predict the impedance of complex and/or asymmetric acoustic treatments.

• Adjunct methods for calculating acoustic propagation in non-uniform flows.

Experimental methods and test equipment

• Characterization of absorbent treatments in small ducts (bench cross-sections: 4 cm x 5 cm and 5.2 cm x 8 cm) using microphonic methods (scattering matrix measurement, direct and inverse impedance measurement methods) and optical methods (Particle Image Velocimetry, Laser Doppler Velocimetry, digital holography).

• MAINE Flow (Multimodal Acoustic ImpedaNce Eduction with Flow) is a 15 x 28 cm flow bench with speeds of up to 750 km/h, featuring modal detection and control methods. In particular, the test bench can be used to perform scattering matrix and impedance measurements.

Banc MAINE Flow

Recurring collaborations

Academic

CRASH-UdeS (Canada), Hong-Kong Polytechnic University, Trinity College Dublin (Ireland), EPFL (Switzerland), COMOTI (Romania), ONERA (France), INRIA (France), ...

Industry 

Safran Group, Airbus, CTTM, Vibratec, Hexagon, SIEMENS, ...