Noise, Vibration, and Harness (NVH) materials are specifically used to reduce noise and vibration of vehicles. NVH materials are used within the interiors of the vehicle to reduce noise and vibrations experienced due to occupants in the cabin, while it is also use on the exterior to reduce the noise and vibrations by the vehicle. The key sources of noise from a vehicle include engine, driveline, tires, brakes, and wind. Vibrations are usually experienced at the steering vehicle, seats, armrests, pedals, floor, and doors. NVH materials are acoustic devices which are generally classified as sound absorbing materials, sound barrier materials, and sound damping materials. Sound absorbing materials are porous polyurethane foam and their sound attenuating properties are determined by the normal specific sound absorbing coefficient.
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