The effects of using the Absorbent and Semi Infinite Screen together in reducing of Sound Pressure level

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Showing Abstract of The effects of using the Absorbent and Semi Infinite Screen together in reducing of Sound Pressure level

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Title	The effects of using the Absorbent and Semi Infinite Screen together in reducing of Sound Pressure level
Topic:	Health in Mines and Mining Industries	Published Year:	2002
Presentation:	Oral	Published in:	[ 4th Congress on Safety, Health and Environment in Mines and Related Industries ]
Original Language:	Persian	Full Text Size:	Not Available

Abstract of the Article

Note: English CIVILICA is in its Trial Period so Full Texts can not be provided! Persian users can download it here

The effects of using the Absorbent and Semi Infinite Screen together in reducing of Sound Pressure level

Authors:
[ Masoud Rafiee ] -
[ Iraj Alimohammadi ] -
[ Mahmoud Ghanem ] -

Abstract:

In order to acustic measurement 54 points were indicated on the turbine house plant. Measurements were implimented by stationary method. Sound pressure level means when with turbinel, turbine 2 separately and turbine 1 and 2 while operating together were found to be 91.27 dBA, 90.27 dBA and 94.08, respectively. With due attention to absorption coefficient in central frequency in octave bands, economical considerations, availability and atmospheric condoitions, galss wool was selected as the absorbant material. By using constant room (R) factor the average reduction of sound pressure level with the absorbant was then indicated. To increasing the eficiency of the absorbant materia1,application of semi infinite screen with 2.5 m in height and 25 cm in thickness was considered. The mean of sound pressure level reduction by using the absorbant and semi infinite screen together was estimated to be 30.38 dBA. Acoustical charactristics are shown in the paper.

Keywords:

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