Conveners
JISFA 4 / Passive and Active Control of Aeronautical Noise
- Adrien Pelat (Laboratoire d’Acoustique de l’Université du Mans, UMR CNRS 6613)
Reducing the airframe noise under a low-speed flow is a challenging problem in the acoustic design of automotive and aircraft cabins as it should comply with low drag, space- and mass-saving constraints. Moreover, the use of lighter and stiffer structures with low critical frequencies transmit more efficiently mid-frequency noise components towards the cabin, such as those induced by a...
Within a helicopter cabin, passengers are in close proximity to disturbing sources that contribute to interior noise: main and tail rotors, engines, main gearbox and aerodynamic turbulence. These sources generate bending vibrations of the entire tail boom, induced vibrations in the cabin at blade passing frequencies, transient vibrations of rotor blades and structure borne noise induced by...
The acoustic design of a philharmonic auditorium involves controlling the propagation path between the instruments and the listeners. Today, this control has become a standard practice and is applied more broadly, even extending to the definition of the sound environment in business aircraft. Absorption needs to be strategically distributed based on its cost, mass, size, and effectiveness on...
MAINE Flow (for Multimodal Acoustic ImpedaNce Eduction with Flow) is a large-scale duct that allows investigating the acoustic properties of liners with flow and acoustic conditions typically found in nacelles of aircraft engines: the incident acoustic level can go up to 150 dB and the flow velocity up to Mach 0.6. Compared to other large-scale experiments, this facility permits a precise...
The SALUTE project aims at evaluating performance of electroacoustic metasurface, employing a surface array of controlled electroacoustic actuators, for smart acoustic lining under grazing turbulent flow for UHBR Engines. Theoretical and numerical investigations have been carried out for designing innovative concepts for complex aero-acoustic characterization in an engine mock-up. A specific...
