The temporal nature of in-cabin wind noise heard whilst driving is not generally reproduced in wind tunnels, since turbulence arising from the atmosphere and wakes of other vehicles are not stimulated. For this work, turbulence was generated in the IVK Wind Tunnel, either by means of a large plate in the settling chamber or a small car placed in the nozzle exit. In-cabin noise and external flow properties were measured for a test car under the above conditions and also on-road. Whilst similar turbulence intensities to those measured on-road were measured in the tunnel, acoustic spectra showed little difference between the test conditions, although subjectively the sounds were different. Modulation analysis (a type of time-fequency analysis ) revealed the temporal nature of the sound. It was concluded that further emphasis be placed on developing methods to more closely represent the nature of the human auditory system to temporal fluctuations and for simulating the real flow environment in wind tunnels.
The effect of turbulence on wind noise: a road and wind-tunnel study
Einfluss von Turbulenzen auf das Windgeräusch: Straßen- und Windkanal-Untersuchungen
2001
15 Seiten, 11 Bilder, 15 Quellen
Conference paper
English
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