The sources of noise in a vehicle are many, including the
engine, driveline, tire contact patch and road surface, brakes, and wind. Noise
from cooling fans, or the HVAC, alternator, and other engine accessories is
also fairly common. Many problems are generated as either vibration or noise,
transmitted via a variety of paths, and then radiated acoustically into the
cabin. These are classified as "structure-borne" noise. Others are
generated acoustically and propagated by airborne paths. Structure-borne noise
is attenuated by isolation, while airborne noise is reduced by absorption or
through the use of barrier materials. Vibrations are sensed at the steering
wheel, the seat, armrests, or the floor and pedals. Some problems are sensed
visually - such as the vibration of the header rail or rear view mirror on open
topped cars.
Necessity of NVH
# Noise Pollution – CMVR, CPCB & NCNPC
# Customer Awareness Of Vehicle Ride
Comfort
# Marketability
#Trend Towards
Higher Power And Smaller Size Power trains.
# Sound Quality
# Design Optimization
# Consistency In Production
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