Transient Wind Noise

Paper #:
  • 2013-01-0096

Published:
  • 2013-03-25
DOI:
  • 10.4271/2013-01-0096
Citation:
Watkins, S., Thompson, M., and Alam, F., "Transient Wind Noise," SAE Technical Paper 2013-01-0096, 2013, https://doi.org/10.4271/2013-01-0096.
Pages:
8
Abstract:
Wind noise sources are described including those from the A-pillar region, cavities and bluff bodies. Hydrodynamic pressure fluctuations results from flow separations (in such areas as the A-pillars and mirrors) that generate relatively broad band in-cabin noise. The influence on local radii of the A-pillar is outlined and shown to be a dominant factor in determining hydrodynamic pressure fluctuations in the side-glass regions. Small cavities (eg. styling or water management channels on the mirror casing) generate high-frequency acoustic tones that can also be heard in the cabin and an example of tones from a whistling mirror cavity is shown. A spectrogram of in-cabin noise obtained whilst driving in strong winds is used to illustrate the variability of noise that can be heard on-road and to consider the influence of the relative wind speed.
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