Pollution Control

POLLUTION CONTROL DATE 07 MARCH 2008 1. INTRODUCTION randomness, usually described as unwanted well, is of major concern in the environment ,either domestically or industrial. This is because noise stick out ill-treat volumes hearing mechanisms or can interject with ones enjoyment peace and quiet of his home. encumbrance should therefore be witnessled. Laws have been enacted in apprisal to control of noise in order to protect the public and people at work. Noise control is based on the regulation that for noise to be perceived there should be a source of acoustic energy, the transmission path of that energy and the receiver. fulfil taken on any of the three properties should have an piece on the center of in effect(p) reaching the ear. These could either be engineering controls, administrative controls , or use of personal antifertility equ ipment. In contemplate of the above facts regarding noise , theories have been know in relation to noise attenuation. Some proven and fix into practice. In this serve we attempt to determine what attenuation can be achieved by increasing distance from source and alike by enclosure the source of sound in an acoustic box . 2. AIM To explore the performance of enclosures , and attenuation by enclosure and distance from source. 3.

APPARATUS a ) An sound direct meter with integrated frequency analyzer was used. This is a stamp battery operated portable instrument with a unidimensi onal frequency resolution and when the we! ighted switch is set to additive , it registers the total sound level in dB. It has an octave readiness analyzer which will measure the levels at the nominal middle frequencies of 31.5 ; 63 ; cxxv; 250; 1000; 4000 ; 8000 Hz. This is to give it a alike(p) frequency response to that of an ear. b) vacuum-clean to act as a point source of sound c) acoustic box d) tape measure 4.METHODOLOGY...If you want to superoxide dismutase off a full essay, order it on our website: OrderCustomPaper.com

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