Nonlinear vibroacoustic response of finite-size porous and micro-perforated plates
Metallic open-cell porous plates and micro-perforated plates are lightweight structures which can be used in hostile environments, such as aircraft engines where high sound pressure levels and high amplitude vibrations are expected. Such structures involve viscous and thermal material mechanisms which translate into mechanical damping and sound absorption properties. Leclaire et al have proposed a corresponding theoretical framework within the linear context of small vibroacoustic excitations and responses.
It was notably observed that the presence of fluid in a porous plate advantageously induces additional structural damping. However, it is known from experimental investigations that the vibroacoustic response of the above systems is very sensitive to the magnitude of external excitations. Accordingly, it is proposed to explore analytical, semi-empirical and numerical avenues to extend the current model to a nonlinear framework. An attendant experimental program will bring physical insight, characterize and validate the implemented models.
The project will be articulated in three parts:
- Nonlinear vibroacoustic response of finite-size porous plates under high sound pressure level,
- Nonlinear vibroacoustic response of finite-size porous plates under strong levels of displacement,
- Application for Nonlinear vibroacoustics to micro-perforated structures.
The interested applicant is expected to show good skills in the areas of structural vibration, acoustics and vibro-acoustics.
Programme d'études visé
Domaines de recherche
Aérospatiale, Transports terrestres, Matériaux et fabrication
21 000 $ / year
Starting : 2020-08-31
Partners involves : McGill University, and Université de Bourgogne (Nevers, France) and ETS.
Various trips to the collaborative laboratories will be scheduled.