IEC Acoustic Standard IEC 61400-11
IEC Acoustic Standard IEC 61400-11
IEC Acoustic Standard IEC 61400-11
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Binning and Averaging<br />
After binning by 10 meter wind speed,<br />
for each bin that has enough data in the<br />
bin<br />
– Arithmetically average wind speed,<br />
most likely will not be at the bin center<br />
but close<br />
– Energy average sound pressure<br />
levels<br />
– For each bin you have an average<br />
wind speed and sound pressure level<br />
NATIONAL RENEWABLE ENERGY LABORATORY<br />
wind<br />
Aweighted<br />
sound<br />
pressure<br />
count speed level 10 0.1*spl<br />
n spl<br />
1 <strong>11</strong>.9 50.59 <strong>11</strong>4551<br />
2 <strong>11</strong>.6 50.88 122462<br />
3 <strong>11</strong>.3 48.13 65013<br />
4 10.4 46.49 44566<br />
5 10.0 45.95 39355<br />
6 9.1 45.57 36058<br />
7 9.6 45.73 374<strong>11</strong><br />
8 8.3 44.36 27290<br />
82.2 Sum 486705<br />
10.3 Sum/n 60838<br />
log10 4.78<br />
10*log10 47.8
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