Réponse d'une plaque couplée à une cavité acoustique excitée par un écoulement turbulent

• Main Author: Levitte, Emmanuel
• Other Authors: Atalla, Noureddine
• Language: French
• Published: Université de Sherbrooke 2008
• Online Access: http://savoirs.usherbrooke.ca/handle/11143/1397

Since many years, transport noise reductions have been a high priority for manufacturers. Indeed, low noise level into cars or planes has become an important sale argument. Furthermore, passengers comfort is nowadays a main concern for aerospace manufacturers. In this master work, we have investigated how aircraft cabin noise sources exist in a plane during cruising flight. Aircraft cabin noise is mainly due to the fuselage boundary layer. In this paperwork, we have done a review of the turbulent boundary layer articles existing in the literature. Then, to compare these articles, we have implemented these models on Matlab and Fortran programs by using a plate-backed cavity to study the various turbulent boundary layer (TBL) models, in particular the use of SEA (Statistical Energy Analysis) versus a full modal description to study the breakdown of the transmission paths from the source to the cavity. A whole chapter is focused on the determination of the joint acceptance which determines how well a structural mode couples with the external pressure. Moreover, we have determined several indicators, such as input power or quadratic velocity. To validate our code, we have compared it to experimental data by using AutoSEA2 software. Then, we have compared the different transmission paths for TBL excitation, such as resonant modes versus non resonant modes. To validate our work, we compare our results to these Davies [1] experimental data.