Noise pollution - effects and its concern. Solution for controlling the noise pollution through acoustics materials.

1. Social Relevant
Project
Under the guidelines of
Dr. K. KRISHNA
BHASKAR
Noise Barriers For
Sound Pollution
P Santosh Kumar (19021A0328)
S Mohan Sainath (19021A0330)
M Bharathi (20025A0355)

2. Noise Pollution
Noise pollution can be
defined as any disturbing or
unwanted noise that
interferes or harms humans
or wildlife.

3. Causes Of
Noise
Pollution
 Road traffic
 Air traffic
 Construction
 Industrial activity
 Amplified music etc.

4. Noise Levels
Noise levels
Noise Average decibels (dB)
Leaves rustling, soft music, whisper 30
Average home noise 40
Normal conversation, background
music
60
Office noise, inside car at 60 mph 70
Vacuum cleaner, average radio 75
Heavy traffic, window air conditioner,
noisy restaurant, power lawn mower 80–89 (sounds above 85 dB are
harmful)
Subway, shouted conversation 90–95
Boom box, ATV, motorcycle 96–100
School dance 101–105
Chainsaw, leaf blower, snowmobile 106–115
Sports crowd, rock concert, loud
symphony
120–129
Stock car races 130
Gun shot, siren at 100 feet 140
Noise level is measured in decibels
(dB). The louder the noise, the higher
the decibels. Prolonged exposure to
loud noises (75 dBA over eight hours a
day for years) can lead to hearing loss.
The body can also respond to
lower noise levels. sleep can be
disturbed by an outdoor noise of 40
dBA.

5. Human
Hearing Levels
For human ears 70dB-90dB
is get for comfortable
hearing above 90dB are
harmful for hearing.

6. Effects Of
Noise Pollution
 Hearing Loss (NIHL)
 High blood pressure
 Heart disease
 Sleep disturbances
 Mental stress.

7. Sound Barrier
The sound barrier wall is
typically used outdoors to
control industrial/mechanical
noise, HVAC noise,
transportation noise and
other disturbing noises
produced by chillers, air
handling equipment, fans,
transformers, compressors
etc.

8. Types of Noise Barriers
Reflective Absorptive
Sound waves will do two things when they encounter an object either they can be absorbed
or they can be reflected

9. Effectiveness Of Absorptive Material
The combination of reflective barriers and commercial
buildings often increase noise to the Receiver via
unintended reflective sound waves.
When absorptive materials are used at the barrier and
on the building, reflected sound is minimized,
significantly reducing noise at the Receiver.

10. Absorption
Coefficient Of
Different Materials
Sound absorption coefficient is
used to evaluate the sound
absorption efficiency of
materials. It is the ratio
of absorbed energy to incident
energy and is represented by α.
The sound absorption
coefficient of materials is
correlated with frequency, and it
varies with different frequencies.

11. Design
Soundproof barriers use
composite layers of vinyl, foam
or fiberglass to block, dampen
and deflect sound energy and
vibration. They are often
flexible and equipped with a
peel-and-stick adhesive that
makes them incredibly easy to
install around pipes, on top of
drywall, and inside
nontraditional spaces like boat
cabins and vehicle trunks.
Absorptive wall Absorptive panel

12. Strength Of Absorptive Materials
 A typical sound absorbing noise
barrier wall panel is eight (8")
inches thick, four (4") inches of
sound absorptive mixture and four
(4") inches of structural concrete.
 Noise barrier panels are designed
to be used with either concrete or
steel support post.
 Noise barriers absorbs up to 85
percent of the noise.

13. Benefits Of
Absorptive
Materials
Noise barriers are easily
customizable and easy to install.
It is effective way in this time to
avoid the disturbances and
felling relax in the free time and
also to improve the mental
health.

14. Planting of trees
is the ultimate
solution for any
kind of pollution

15. Thank you