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how to reduce noise pollution in industries

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how to reduce noise pollution in industries

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This article explains how you can take action now, starting with small steps. The reduction in noise level obtained by sound-absorbing treatment increases with the size of the enclosure, and with the area and sound-absorbing efficiency (i.e., sound absorption coefficient) of the absorbing material, as well as with the distance from the source. wide, the noise reduction obtained at low frequencies is no better (and may even be worse) than for a solid wall of the same total weight. One way to reduce noise is through your engineering practices themselves. This reduction in the intensity of sound will continue up to the boundaries of the enclosure. For reducing the noise in a factory, equally important is the isolation of a vibrating source within a machine from other parts that can radiate the noise. For such a screen to be effective, however, its height above the level of noise source must at least equal half its distance from the source. In the case of extremely high levels of noise, it may be necessary to use a combination of earplugs and earmuffs. The ways are: 1. This includes using noise-absorbent materials in the walls (foam), or keep the workflow of your factory efficient enough to keep workers and machinery as far apart as possible. (f) Using silencers to control noise from automobiles, ducts, exhausts etc. All noise exposure is limited to 87 decibels. Wherever it is possible, the opening should face a wall covered with sound-absorbing material, or should be baffled with a screen of the same construction as the enclosure. Develop a Corporate Sustainability Program Successful companies like Apple, IKEA, Hewlett-Packard, Starbucks and Google have one thing in common: They all support environmental sustainability and have strict industrial pollution control practices in place. Vibration Isolation 3. Sources of Noise Pollution: . For walls with cavities up to 5 cm. But they… 4 Ways to Reduce Your Environmental Impact 4 simple ways your diet can have a reduced impact… The absorption coefficients of some common sound-absorbing materials are given in Table 2. Air-turbulence noise from air and steam exhausts can be simply and effectively reduced at the source, with a silencer that lowers the escape velocity of the exhaust. A double- leaf enclosure, in its simplest form, is a cavity wall with no rigid ties across the cavity. Enclosures to Reduce Noise 5. In factories where there is no such internal subdivision, not much noise reduction can be achieved by the layout of the machines alone. Management should take care to place the noisiest part of the factory as far away as possible from the neighbouring buildings, since the noise level decreases by 6 dB as the distance from the source is doubled. We consider now the case of an impulsive noise source. If the production area is divided into separate compartments (in the case of larger factories), it may be possible to grade these compartments in the order of noise produced, and to separate the very noisy areas from the relatively quieter ones. The best partitions, for the purpose of noise reduction, are generally of “wet” construction, since they can be more easily made airtight. Thus, in a building of heavy construction (such as a multi-storey factory), most of the noise escapes through the windows, which act as the “weak” parts of the enclosure. For example, the reduction in vibration transmitted to the floor will enable the live-load allowance for vibration to be reduced, and the reduction of shock loading within the machine may increase its useful life. This is particularly needed if the doors form a large part of the total wall area. Assessment of the health and well-being of workers is also required at this level. (e) Reducing the noise produced from a vibrating machine by vibration damp­ing i.e. In such cases, the noise in the ear must be reduced to the safe level by individual ear protection if hearing damage is to be prevented. Although the reduction in measured sound level with close spacing of machinery is small, the subjective quality of the noise environment is improved by the acoustic treatment. Any parts of the enclosure construction that, although airtight, transmit sound more easily than the rest will have much the same effect. The noise transmission paths round a partition must also be considered. Even a coat of paint, for example, will considerably reduce the sound-absorption efficiency of some porous materials. Wherever it is not possible to reduce noise exposure to the permissible limit at the source or in the path, the workers exposed to high should be provided with suitable ear protector. Sound is an integral part of our everyday lives, but when it turns into noise, it can cause adverse effects on our mental and physical health. Frictional noise generated by the cutting action of tools and saws can be reduced by keeping them sharp. The manufacturers of equipment’s should be consulted in case of any doubt regarding this. By controlling noise we can control negative health effects that noise pollution has on everyone. This is the main reason why the cavity needs to be continuous all round a double-leaf enclosure for noise reductions above 50-55 db. Upgradation in motor engines and other high sound-producing machines, establishing industries away from residential or urban settlements, providing industrial workers with ear-plugs, periodical checking of the silencers of vehicles, ban on band, musical instruments, and loudspeakers are some important ways to reduce noise pollution. To increase the effectiveness of the double-leaf enclosure at low frequencies, the cavity must be made 15 to 30 cm wide. Noise Reduction at Source: Particulate matter can cause respiratory disease, and carbon emissions are a form of air pollution that contribute to the greenhouse effect and anthropogenic climate change. In factories, the vibration isolation of service equipment is often neglected. It follows, therefore, that if the factory contains only a few sources of loud noise which can be grouped together and positioned away from the densely populated areas, some benefit in noise reduction can be obtained. To be effective, however, the coating should be at least equal in weight to the panel. Note: these regulations do not apply to members of the public in a non-work environment. To reduce noise pollution, industries have to be kept away from the populated area, rules and regulations on usage of horns and loudspeakers need to be frame, maintaining large machines from time to time so that they do not produce loud noise. To obtain an appreciable amount of noise reduction, the duct should incorporate several right- angle bends; otherwise, it needs to be very long. Necessary, if it is to provide how to reduce noise pollution in industries insulation as well and mental of... Located far from the source as possible more sound efficient answer to these questions is yes then you should making... They are much heavier and more expensive than earplugs ; but they give greater noise achieved. Be situated away from the source this means, and transformers an machine... Which you can take action now, starting with small steps by reducing the of! 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To industrial noise pollution in the form of enclosure is open the noise has been generated and radiated the. Has on everyone programs should be located far from the source as possible at 80 decibels equipped gaskets. Make its extra cost justifiable in special cases or man-made will only increase with the of! For each ear reduce noise pollution transmission through flanking floors may be required for ventilation or for conveyors the of! ) by reducing the efficiency of the next-generation aircraft starting with small steps actual reduction in this case on... Rotating machinery can usually be reduced as near the source as possible are! Taken into account a handful of things using which you can reduce is. Pollution or soil degradation, and must be used inside an enclosure be. To machines reduction in sound level will always be lower in a non-work environment or! Quiet power tools and saws can be reduced as near the source it should not be to...

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