Correlation analysis of interior and exterior wind noise sources of a production car using Beamforming technique

Paper #:
  • 2017-01-0449

Published:
  • 2017-03-28
Abstract:
Beamforming technique is today widely used in aeroacoustic wind tunnel to identify wind noise sources generated by interaction between incoming flow and test object. In this study, a planar spiral microphone array with 120 channels was set out-of –flow of 1:1 aeroacoustic wind tunnel of Shanghai Automotive Wind Tunnel Center (SAWTC) to test exterior noise sources of a production car. Simultaneously, 2 reference microphones were set in vehicle interior to record potential sound source signals synchronously and a spherical array with 48 channels inside the vehicle to identify interior noise sources. With different correlation methods and some advanced algorithms, i.e. using CSM and Clean-Sc, the ranking of contributions of vehicle exterior wind noise sources to interested interior noise locations was accomplished. Hereby, Correlation analysis results of interior and exterior noise sources using virtual and real reference microphones are compared and discussed.
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