Noise reduction

Noise reduction

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  ARCHITECTURAL ACOUSTICS TOPIC :NOISE REDUCTION SUBMITTED BY Y13AP0179
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  CONTENT • SOUND ISOLATION •SOUND LEAKS • NOISE REDUCTION BETWEEN ROOMS • CONSTRUCTION DETAILS OF NOISE REDUCTION • NOISE REDUCTION WITH LANDSCAPE ELEMENTS • NOISE REDUCTION WITH BUILT FORMS • LAND USING PLANNING FOR NOISE CONTROL
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  SOUND ISOLATION
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  SOUND LEAKS • Doors:Hollow core doors are poor sound blockers. When privacy is a key consideration, doors should be solid wood or have insulated cores, and should be gasketed to prevent sound from passing between the door and the jamb or sill. • Windows: Double pane and/or storm windows reduce sound transmission. Weather stripping helps. Windows facing exterior noise sources should be small and as few as possible. Double-hung windows should be able to be tightly closed. • Wiring and piping: Holes through which wiring or conduit passes should be sealed or caulked. Cutouts for electrical outlet boxes should be made precisely so boxes will fit snugly. Do not install electrical outlet boxes opposite each other on each side of a wall; these should be staggered. In bathrooms on opposite sides of a wall, medicine cabinets should be staggered. Holes cut out for piping should be sealed with caulking. Just stuffing the holes with insulation is not sufficient. Sound can easily pass through porous insulation. One can stuff the holes with insulation and then caulk over the insulation.
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  NOISE REDUCTION BETWEENROOMS • Every building, must be designed and constructed in such a way to limit the transmission of source noise from normal domestic type activities, through a wall or floor, between a room and internal space where noise is likely to occur, to a level that will not cause inconvenience to the building occupants. Limitation: • This standard only applies to a wall or floor forming an apartment in a dwelling and a room in a residential building which is capable of being used for sleeping; other than: • a wall between an en-suite bathroom and the apartment or room it serves • a hospital • a place of lawful detention.
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  NOISE REDUCTION BETWEENROOMS
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  CONSTRUCTION DETAILS OFNOISE REDUCTION
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  NOISE REDUCTION WITHLANDSCPE ELEMENTS • This method uses plants to entrap or absorb sound vibrations. It is the most commonly used, particularly for large scale applications. • Sound is absorbed by all parts of the plant such as leaves, branches, twigs and wood. The rougher the bark the better it absorbs sound. Experts say the best species for this will have many branches and thick, fleshy leaves with thin petioles (leaf stem). • These broadleaf species lose their effectiveness in the winter when deciduous. Fortunately they leaf out for maximum advantage during the months when windows are open and you're spending time outdoors. In warm climates many more broadleaf evergreens can be used for sound absorption benefits all year around. • A sound attenuation barrier is most effective when located closest to the source of the sound. • Large shrubby trees can also be effective at scattering sound waves. The deeper and more dense the barrier the greater its scattering potential. This illustrates the biggest problem: your designer needs space for an effective solution.
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  NOISE REDUCTION ANDBUILT FORMS Noise from outside a building is reflected around a balcony space. A screen wall is built between a noise source and a house
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  LAND USE PLANNINGFOR NOISE CONTROL • Noise planning controls may operate at either of two scales. At a larger planning scale are general land use allocation noise controls. • These are primarily allocations of various types of development within a larger landscape context (such as a town) to appropriate noise-environment zones. • In other words, noise-sensitive land uses are allocated to quieter zones and noisier land uses are allocated to noisier zones. • Noise control is for the most part a matter of isolating or aggregating land uses to prevent the undesirable exposure of noise-sensitive areas. At this scale, specific types of noise buffers between uses are not considered.
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  THREE STEPS TONOISE CONTROL SOLUTIONS • 1. Locate the source of noise The first step in noise control is to investigate the real noise source. It has been mentioned that noise control problems may involve merely moving the source farther from the receiver, adjusting or repairing the source if it is a piece of noisy equipment, or replacing it. If none of these work, an acoustically efficient enclosure will have to be designed. Once the true source has been identified, the next step is to measure the noise. • 2. Measure the noise A sound level meter is used to measure the noise level at several locations — at its source, along its path, and at the receiver or listener’s location — using the A- weighted scale and also measuring the sound level in octave or third-octave bands. Sound level meter readings will not only provide sound pressure (loudness) levels at various locations, but will also show which frequencies are most offensive to the listener. This data will be helpful in selecting acoustical materials with sound absorption and/or sound reduction properties best suited to the particular application. • 3.Noise from central equipment: When operating heating and air-conditioning equipment, a good guideline is “lower and slower”: lower volumes of air moved through the system with fans and blowers operating at a slower speed. Central air equipment should also be acoustically isolated from spaces where airborne noise would be objectionable. Equipment should be mounted on vibration isolators to avoid transmission of structure borne noise. Sound traps or baffles will help to attenuate equipment noise in adjacent ductwork.
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  THANK YOU