Isaac James will defend his thesis entitled "Contribution to the modeling of an automotive turbocharger and its acoustic characterizations" at the Arts et Métiers campus Arts et Métiers Lille on December 14 at 2:00 p.m.
In this thesis, methods for passive and active acoustic characterization of two-port acoustic systems are presented, based on a decomposition of plane waves at the input and output. This decomposition is performed using the beamforming method. These methods, implemented and validated on simple geometries, are then used to characterize the compressor stage of an automotive turbocharger. Active acoustic characterization is performed by measuring the acoustic power and intensity in the compressor ducts for specific operating points. Complete compressor maps are also developed. The tests were conducted on a turbo test bench, an engine test bench, and on a complete vehicle. Passive acoustic characterization is addressed by calculating compressor matrices (transfer matrix, impedance matrix, and diffusion matrix). The calculation of acoustic transmission loss is derived from these matrices. Tests were performed and compared with 3D finite element simulations on both a static turbocharger and an operational turbocharger.
