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A sound attenuator, or duct silencer, sound trap, or muffler, is a noise control acoustical treatment of Heating Ventilating and Air-Conditioning (HVAC) ductwork designed to reduce transmission of noise through the ductwork, either from equipment into occupied spaces in a building, or between occupied spaces.
The hierarchy of controls [17] is a guideline for reducing hazardous noise. Before starting a noise reduction program, base noise levels should first be recorded. [18] After this the company can start to eliminate the noise source. If the noise source cannot be eliminated, the company must try to reduce the noise with alternative methods.
Acoustic quieting is the process of making machinery quieter by damping vibrations to prevent them from reaching an observer. Machinery vibrates, causing sound waves in air, hydroacoustic waves in water, and mechanical stresses in solid matter.
A pair of headphones being tested inside an anechoic chamber for soundproofing. Soundproofing is any means of impeding sound propagation.There are several methods employed including increasing the distance between the source and receiver, decoupling, using noise barriers to reflect or absorb the energy of the sound waves, using damping structures such as sound baffles for absorption, or using ...
Industrial noise is traditionally associated with manufacturing settings where industrial machinery produces intense sound levels, [22] often upwards of 85 decibels. While this circumstance is the most dramatic, there are many other work environments where sound levels may lie in the range of 70 to 75 decibels, entirely composed of office ...
An acoustic liner is a sandwich panel made by: a porous top layer, called face-sheet; a honeycomb structure providing internal partitions; an impervious layer, called back-sheet or back-skin; The lower half of a liner features dedicated internal slots to allow liquid drainage in order to prevent ice formation or fire hazards.
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