Stage M2 – Multimodal acoustics scattering in a duct
MAINE Flow is a 28 ×15 cm2 rectangular duct facility recently developed at LAUM for the purpose of studying acoustic liners, which are wall treatments used to reduce the noise generated by aircraft engines. The primary objective of MAINE Flow is to replicate realistic conditions for these liners, encompassing high-speed flows (up to Mach 0.6) and a multimodal incident wave field of large amplitude (up to 150 dB). One of the most interesting aspects of this experimental facility is the ability to control the modal content propagating within the duct, even at 4000 Hz where approximately 25 modes are cut-on. Additionally, two antennas of 60 microphones enable the measurement of the multimodal scattering matrix of the lined section. The fact that we control and decompose precisely the acoustic field in the duct is highly valuable for characterizing liners and the aim of this internship is to extend this feature to the study of the multimodal scattering induced by objects placed inside the duct.
In fact, this internship is connected to a future PhD program where we want to use the multimodal aspect of our framework to control an acoustic field which passes through disordered structures composed of multiple scatterers. But, before doing that, it is necessary to learn how to use MAINE Flow to characterise simple scattering configurations and to see what kind of insights we can get from it.
More informations on the link below.