Modulation of in-cabin car wind noise by atmospheric winds

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Modulation of in-cabin car wind noise by atmospheric winds

Mousley, P.D. / Watkins, S. / O'Shea, P.

A program to uncover links between fluctuations in atmospheric winds and the modulation of vehicle interior noise has been undertaken at RMIT University. In this paper, an introduction to the complex interactions between the wind environment and interior noise is provided, along with a brief discussion of the problems associated with evaluating a vehicles noise performance in gusty wind conditions. Examples of links that have been found to exist between wind fluctuations and the modulation of interior noise, and the methods used to obtain these links, are presented. Close to the earth's surface the atmospheric boundary layer contains random fluctuations termed 'atmospheric turbulence'. Several studies have investigated the frequency content of atmospheric turbulences, which is dependent on the surrounding terrain and any obstructions. The close proximity of the ground has a major influence on the turbulence experienced by a moving vehicle. Attempts have been made to simulate atmospheric turbulence for full-scale testing in wind tunnels but no satisfactory method currently exists. At RMIT University a program has been undertaken to better understand this interactions.