Discussion
Which noise path does a vehicle body transmit to the occupants?
Answer: D
Vibration from the engine, transmission and suspension travels through the mountings into the body, where panels radiate it as noise, and this structure borne path dominates at low frequencies. Airborne noise from the engine bay, the tyres and the wind dominates at higher frequencies and enters through apertures and panel transmission. Controlling both requires quite different measures, isolation and damping for the one and sealing and mass for the other, which is why refinement work is such a broad discipline.
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