IEC Acoustic Standard IEC 61400-11
IEC Acoustic Standard IEC 61400-11
IEC Acoustic Standard IEC 61400-11
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8 Data Reduction Procedures<br />
Correction for background noise<br />
Background correction is used for sound pressure levels, onethird<br />
octave levels, and tonality<br />
NATIONAL RENEWABLE ENERGY LABORATORY<br />
L s equivalent continuous sound pressure level of<br />
wind turbine operating alone<br />
L s+n equivalent continuous sound pressure level of<br />
wind turbine plus background noise<br />
L n background equivalent continuous sound<br />
pressure level<br />
If difference between Ls+n and Ln is greater than 6dBA use equation<br />
If between 3-6dBA then use correction of 1.3dBA and marked with<br />
an asterisk “*”. Cannot be used for sound power level calculation.<br />
If difference less than 3dBA, cannot report and report “turbine noise<br />
was less than background”<br />
20
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