Air intake acoustic radiation on an internal combustion engine. Numerical and Experimental analysis at component state

摘要

According to recent engine development, powertrain tests tend to be reduced. Thus manufacturers and suppliers have to improve their design and validation tools on component stage, in order to save time during the project and to avoid further acoustic issues on powertrain. As the NVH air intake contribution to the overall engine noise is not negligible, it's consequently necessary to manage the airborne acoustic excitation as well as the radial acoustic transfer of the components. This paper focuses on the acoustic transfer function. PSA and MECAPLAST - involved in this approach - set out the virtual and experimental analysis that can be performed on plastic components charged with acoustic sources induced by the turbocharger. CTTM (Centre de Transfert de Technologie du Mans) has also been involved into that project to put into evidence advantages from intensimetry methodology. This paper shows how numerical and physical approaches have been developed to reach the NVH targets. In this way, Fluid-Structure methodology has been built to simulate physical phenomenon, and a NVH measurement protocol - taking into account airflow, temperature and pressure-has been established. Therefore on component stage, NVH contribution and frequency range induced by intake line radiation can be confidently identified. It fully responds to the common objectives of OEM and supplier.