1988-09-01

A Consideration Of Wind Noise Reduction By Air Flow Control 885115

The relation between the wind noise level at high speed cruising and the vehicle body shape was studied.
The wind noise level in the vehicle depends on the external aerodynamic noise and the noise isolation characteristic of the weatherstrip, body panel and so on. In order to reduce the wind noise level; the modification of the body shape is an important Batter.
Based on model experiments, it is shown that the aerodynamic noise is generated mainly on the front door windshield glass and its level is effected by the air flow around front pillar.
As the aerodynamic noise is induced by the velocity or pressure fluctuation of air flow, the relationships among the front body shape, the air flow fluctuation and the aerodynamic noise are described analytically.
The results were applied to the improvement of design of the production vehicles.

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