CLASSIFICATION OF NVH

# By Noise Type

1)      Road NVH

Comprises of the noise generated due to the road contact patch with tyres and their relative motion.

2)      Wind Noise

Noise generated due to the wind , side wind which brushes the vehicle bode at the time of motion.

3)      Powertrain/Driveline NVH

During power generation and transmission  some form of noise gets the share due to friction in mating parts such as gears, combustion in engine cylinders etc.

4)      Squeak /Rattle

There are some misalignment in various assemblies of various components which creates noise when automobile is in motion.

# By Vehicle Systems

1)      Body NVH

NVH related to the body shell of the vehicle only.

2)      Chassis NVH

NVH related to the chassis or the  main stress line components such as the engine , transmission, axles, etc.

# Vehicle Components

1)      Climate Control System

Noise of climate control system such as Air Conditioning, Heating Systems etc.

2)      Wipers

Vehicle wipers also generates noise during working due to rubbing action occurring between the glass and wipers

3)      Seat Motors

They form the most integral part of modern cars which generates noise but is only limited to a short time lapse.

4)      Switches

They form the most integral part of all cars which generates noise but is only limited to working of very short period only when the operator needed to turn the switch.