Inverse Method on Vehicle’ Panels for Wind Noise Source Identification

Paper #:
  • 2017-01-1784

Published:
  • 2017-06-05
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Affiliated:
Abstract:
Automotive wind noise’s physic is complex : noise for passengers depend of : - acoustic transfer function in the cabin - transfer loss of seals and panels - first of all, exterior loading due to the flow around the vehicle For some years, we know that the exterior loading can and must be split in two parts : - Hydrodynamic (or turbulent) loading with high wave number pressure field - Acoustic loading with low wave number pressure field In simulation people start to separate the two pressure fields by complex signal processing. But in real life test, there is no simple method to do so. In this paper we present an inverse method, call “Panel Inverse Method” (PIM) which can extract the low wave number loading measured on a vehicle panel. The method may be known with the French “RIFF” name. It is based on acceleration measurement of the panel to calculate the pressure which create panel’s motion : that’s typically an inverse method. Limits and improvement possible of the method are presented Extensive experiments carried out on several Renault vehicles demonstrate the ability of the method to extract the acoustic loading in a flow with several speed.
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