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TECHNOLOGY ROADMAP: TRANSPORTATION
COMMERCIAL AREA
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FIG 4.13
THE NOISE POLLUTION
(REGULATION AND CONTROL)
RULES [11]
70 45
INDUSTRIAL AREA RESIDENTIAL AREA
50
40
SILENCE AREA
DAY TIME NIGHT TIME LIMITS IN dB(A)
Most of the community, especially in the Indian to disabled persons on the road. Acoustic
subcontinent, is not aware that noise can cause material technologies can also be used for noise
any health damages and in contrast, studies reduction in vehicles. Table 4.7 shows some
globally, has provided significant evidence that noise control technologies.
environmental noise and especially road traffic-
generated sound has severe negative impact 4.15 GAPS IN NOISE RESEARCH
on human health. Currently, limited research Development of low noise powertrains
exists on the exposure-effect studies of road is an important area for research. Pass by
traffic noise in the Indian scenario, with most noise from vehicles needs to be reduced by
reporting the noise quality only. Noise reduction designing superior silencers and damping
system that uses active force cancellation is engine noise. Techniques like acoustic
being used by the world’s major automobile holography should be used for development
manufacturers. In the past, attempts to reduce of low noise powertrains. Acoustic enclosures
the effects of noise and vibration in vehicles along the highways to control pass by noise
have been based on passive technology and the are some of the requirements for future noise
use of elastomeric springs for isolation. Some control. Tyre noise needs to be reduced by
vehicle manufacturers want to tune the sound developing high quality tyres. Road surface
to create a desirable sound quality with specific quality should also be improved. Noise
harmonics. This is the introduction of noise in introduction in quite electric vehicles is
electric and hybrid vehicles which are quiet in another important area of research.
operation and may cause a potential threat
ROADWAYS 81
