Automotive pass-by noise is a complex test that requires the fulfilment of several different standards with regard to the physical track layout, measurement systems, data acquisition, triggering, processing and analysis. This paper describes the system developed by CIRA's vibro-acoustic Lab to provide a novel noise test solution that allows efficient, accurate and repeatable car noise advanced testing for external sound quality characterization and improvement while maintaining the ability of performing vehicle pass-by noise testing. The innovative system, based on two phased array antenna, each one with the main dimension of 1.5 m, 96 MEMs microphones, in a random optimized configuration, and one full HD video-camera, has been developed inside the national project LOWNOISE, funded by MIUR (Italian Ministry of Education, University and Research). Preliminary laboratory tests have been performed in CIRA's hemi-anechoic chamber in order to demonstrate the capabilities of the antennas in the detection and tracking of stationary and moving noise sources by means of broadband beamforming algorithms and TDOA. The performed tests has shown the correct functionality of the system and its accuracy in acoustic noise sources localization. Furthermore, the synchronization between acoustic and video signals has been performed to allow the required data fusion to improve system performance.
|Titolo:||Acoustic antennas characterization for pass-by-noise tests|
|Data di pubblicazione:||2016|
|Appare nelle tipologie:||4.1 Contributo in Atti di convegno|