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Acoustics is the science of study of SOUND - its generation, propagation and finally its receipt by a listener. Unwanted sound is defined as NOISE. Noise is a result of activities such as loud talking, operation of machinery or vehicles in the neighbourhood. In today`s world, noise has assumed an important area of study since it affects our way of life, our health and our psychology. Noise protection has become a big challenge to human beings. The noise generated from vehicular traffic and railways create a major pandemonium to the surroundings. Buildings located next to highways and even next to heavy traffic roads in the cities face a lot of noise pollution inside. This effect of noise increases tremendously after the evening hours. The noise generation varies with the kind and variety of automobiles, for example Two Wheeler, normal Cars, racing Cars, buses, trucks etc. This category of sound generated by the vehicles has become major problem in the metros. Many building owners are looking for sound barriers at the periphery / boundary wall to stop the sound coming in. Buildings located next to Railway track are also open to sound pollution due to crackling noise coming through the tracks. Here also the sound effect is felt more during night. Metro lines are over ground mostly in cities which also generate similar noise problem. There is a requirement for proper design, fabrication & construction of acoustical barriers, which can stop noise level by 15-20 dbs. In this case, the sound generated is at the ground level and usually the noise propagation is restricted within a height of 1-2 metre. Properly designed noise barriers upto a height of 2 metres can stop the noise propagation to inside of buildings. These acoustical barriers are usually of metal frame or high density plastic with high density fibrous insulation packed inside to stop the noise. These panels are placed over solid boundary wall or over metal stands. These sound barriers in case of building when fixed over boundary wall will be made mechanically stronger to act as anti theft solid barrier. These panels can also be designed & coloured in such a way so that trees planted outside will have a very good aesthetic impact. The sound barriers installed next to railway tracks will be of sufficient mechanical strength so as to withstand various types of abuses. In both cases acoustical barriers will be water & dust proof and have an extended life.
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