IEC Acoustic Standard IEC 61400-11

Recommendations

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Outliers? sound pressure level (dB A) 55 50 45 40 35 30 25 20 NATIONAL RENEWABLE ENERGY LABORATORY 0 2 4 6 8 10 12 14 wind speed (m/s) 26
Binning and Averaging After binning by 10 meter wind speed, for each bin that has enough data in the bin – Arithmetically average wind speed, most likely will not be at the bin center but close – Energy average sound pressure levels – For each bin you have an average wind speed and sound pressure level NATIONAL RENEWABLE ENERGY LABORATORY wind Aweighted sound pressure count speed level 10 0.1*spl n spl 1 11.9 50.59 114551 2 11.6 50.88 122462 3 11.3 48.13 65013 4 10.4 46.49 44566 5 10.0 45.95 39355 6 9.1 45.57 36058 7 9.6 45.73 37411 8 8.3 44.36 27290 82.2 Sum 486705 10.3 Sum/n 60838 log10 4.78 10*log10 47.8
Page 1 and 2: Part I Acoustic Testing Stepping Th
Page 3 and 4: 1 Scope General description and pur
Page 5 and 6: 3 Definitions and 4 Symbols and Uni
Page 7 and 8: 6 Instrumentation Required acoustic
Page 9 and 10: 6 Instrumentation Acoustical calibr
Page 11 and 12: 6 Instrumentation Traceable Calibra
Page 13 and 14: 7 Measurements and Measurement Posi
Page 19 and 20: 8 Data Reduction Procedures Wind sp
Page 21 and 22: 8 Data Reduction Procedures Apparen
Page 23 and 24: Look at NoiseLab Setup Calibration
Page 25: Filtering for Valid Data - Listen f
Page 29 and 30: Background Correction Calculate the
Page 31 and 32: NATIONAL RENEWABLE ENERGY LABORATOR
Page 33 and 34: One-Third Octave Levels Sound press
Page 35 and 36: Tonality To begin - Two minutes of
Page 37 and 38: Determine Critical Bandwidth Calcul
Page 39 and 40: Classify ‘Masking’ A line is cl
Page 41 and 42: Determination of Tone Level The sou
Page 43 and 44: Determination of Masking Level Calc
Page 45 and 46: Determination of Tonality The diffe
Page 47: Tonality can be complicated and the

IEC Acoustic Standard IEC 61400-11

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