By Duncan Templeton and David Saunders (Auth.)

ISBN-10: 0851390188

ISBN-13: 9780851390185

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Extra resources for Acoustic Design

Sample text

J ! i i i ! i j i ■ I 1 1 I I I I : I ; 1 | ; ; I ! ! i i : i | ί : 1 j InJJ ! 1 5 * i ! I i 10 ! 1 1 i 15 Difference between levels (dB) Reducing number of sound sources A final point, which is often difficult for people not familiar with decibels to appreciate, is the effect on the sound pressure level of reducing the number of sources operating. For example, in a workshop with several machines it is often felt that because one or two machines may not be operating the level will be much reduced.

Hence all the energy will now effectively radiate into a hemispherical surface. Thus the intensity at any point will be twice the intensity at the point had the source radiated uniformly, in all directions, thus the directivity factor is 2 and the directivity index is 3dB. 16 Graph giving the value of K = - ( 2 0 logr+11) as a function of the distancer, in meters, from a point sound source. -| j--"! | ' i | r i. —| i - j j _ — i. - i - ^ — p -- -j •--■j ; ^- | ► |— —— i ; ----^N. -j-- -4- 1—I: j ^^\1 '■■ !

In fact every time the number of sources is doubled the level increases by 3dB. 12 must be used to obtain the resultant levels. 15 and add the levels two at a time. 2dB. 2dB. 2dB and 70dB. 6dB. 15 Graph to be used for the addition of sound pressure levelsfromtwo incoherent sources. - ! i \ 1 c I ! j ! i i i ! i j. _ . -i - - -i - — - : ! _ Ì ! 1 i j\ ! \ ! ! Λν i | ! 1! !! M I M M I ! j ! i i i ! i j i ■ I 1 1 I I I I : I ; 1 | ; ; I ! ! i i : i | ί : 1 j InJJ ! 1 5 * i ! I i 10 ! 1 1 i 15 Difference between levels (dB) Reducing number of sound sources A final point, which is often difficult for people not familiar with decibels to appreciate, is the effect on the sound pressure level of reducing the number of sources operating.

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Acoustic Design by Duncan Templeton and David Saunders (Auth.)


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