Browse Publications Technical Papers 2019-01-1473
2019-06-05

A Transient SEA Model for Transmission of Non-stationary Wind Noise 2019-01-1473

Automakers have reported that passenger perception of vehicle interior wind noise is strongly correlated to the non-Gaussian and non-stationary character of the exterior aero-acoustic wind loading. It has been shown (Rouillard & Sek 2010) that leptokurtic non-Gaussian loading (Kurtosis κ>3) can be synthesized by non-stationary modulation of otherwise Gaussian random loading. This paper presents a transient statistical energy analysis (SEA) model for the aero-vibro acoustic transmission of non-stationary wind noise which uses the same approach - a modulation of otherwise Gaussian random fluctuating pressure loading, in each one third octave band. The authors have previously shown that the non-stationary character of random wind loading can be measured in a wind tunnel or on the road with a suitable surface pressure microphone array (Bremner et al SAE NVC 2017). This paper reviews the formulation of a Transient SEA model and the predicted modulation frequency response functions for transmission of non-stationary exterior wind noise. Non-stationary wind noise test data is then used to show the validity of the model, correlating the modulation of exterior surface pressure, glass vibration and interior wind noise response.

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