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By Duncan Templeton and David Saunders (Auth.)

ISBN-10: 0851390188

ISBN-13: 9780851390185

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Extra resources for Acoustic Design

Sample text

It should be realised that any microphone has a free field response, a pressure response and a random incidence response and is named after those of its responses the manufacturer has arranged to be nearly flat as a function of frequency. Freefieldmicrophone A free field microphone is designed to compensate for the disturbance caused by its own presence in the sound field and is designed to give a flat frequency response to sound waves arriving normal to its diaphragm. At other angles, because the system compensation (attenuation) is too large, the microphone will read values that are too low.

_ . -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. 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.

For example, if the sound level at 5 m from the generator had been measured under anechoic conditions then the level used in the above equation would have to be increased by 3dB to 71 dB (A) to account for the fact that the generator is standing on a hard surface. 1 Absorption coefficient Definition All materials can to a greater or lesser extent absorb sound. T h a t is, they can convert the mechanical energy of molecular vibration into heat. The performance of a material is usually quantified in terms of its sound absorption coefficient a which is defined as a = sound energy not reflected from material sound energy incident upon material For a perfect absorber the value of a would be 1, while for a perfect reflector a would equal zero.

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


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