#NVHTesting —which stands for Noise, Vibration, and Harshness testing—is an essential process in modern automotive development. It measures how a vehicle feels and sounds during operation, ensuring drivers and passengers enjoy a smooth and comfortable ride.

Noise and vibration may come from the engine, tyres, suspension, or even road surfaces. Through NVH Testing, engineers identify these sources and work on reducing them.
https://hasetri.com/working-domain/vehicle-dynamics/in-cabin-indoor-noise/