Noise Barrier for Sound Pollution

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) H igh blood pressure H eart disease Sl eep 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