HEAD acoustics - Consulting - NVH Division - Methods and Tools

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Consulting NVH Consulting Methods/ Tools Wind and Road Noise Analysis

NVH Consulting - Wind and Road Noise Analysis

Wind and Road Noise can easily be recorded together inside the vehicle cabin during a speed coast down with switched off engine. However, in many cases it is essential to separate wind and road noise in order to correctly analyze and judge the single contributions. Moreover it is often important to distinguish between noise shares of different axles or to examine the noise transmission.

Wind and Road Noise Separation

		Separation of Road Noise Sources
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		BTPA for Road Noise
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In order to cope with these requirements HEAD acoustics has developed suitable methods like

Wind and Road Noise Separation,

Separation of Road Noise Sources and

BTPA for Road Noise.

Wind Noise results from air flowing around the car body and increases with vehicle speed. It is influenced by airflow related excitations as they are e.g. caused by the geometry of the A-pillar, the mirrors, or the undercarriage.

In addition to airflow excitation, vehicle interior wind noise also depends on the sound transmission behavior of the car body and may be influenced e.g. by the door and window seals.

Automotive Applications - Wind Noise

Road Noise results from the contact of the rotating wheels (tires) and the road and can generally be separated into airborne and a structure borne contribution. The vehicle interior road noise is, on one hand, influenced by excitation that depends e.g. upon the road surface and the tires, and may even vary with tire pressure. On the other hand, the sound transmission behavior of the vehicle, including the suspension and body, also has a significant influence on the resulting vehicle interior road noise.