IEC Acoustic Standard IEC 61400-11

Recommendations

Info

Bin Centers Bin wind speed averages likely will not be at the center so interpolate (or extrapolate at the ends) to get bin centers – Extrapolate 6 and 7 m/s bins to get the bin center at 6 m/s – Interpolate 6 and 7 m/s bins to get the bin center at 7 m/s – Interpolate 8 and 9 m/s bins to get the bin center at 8 and 9 m/s – Interpolate 9 and 10 m/s bins to get the bin center at 10 m/s Find turbine and background bin center values NATIONAL RENEWABLE ENERGY LABORATORY WS bin WS avg count spl avg 6 6.02 16 48.0 7 7.28 25 47.8 8 7.95 47 50.4 9 9.10 64 52.5 10 10.20 55 55.7 WS bin slope offset int spl 6 -0.16 49.0 48.0 7 -0.16 49.0 47.8 8 1.83 35.9 50.5 9 1.83 35.9 52.3 10 2.91 26.0 55.1
Background Correction Calculate the background corrected sound pressure level spl corr � 10 * log 10 Must have 6 dB separation between turbine and background noise to report sound power level – cannot report 7 m/s sound power level NATIONAL RENEWABLE ENERGY LABORATORY �0.1* splturb � �0.1* splback � 10 � �� 10 � �� WS bin Turb spl Back spl CORR spl Diff 6 48.0 41.4 46.9 6.6 7 46.7 42.8 45.4 3.8 8 50.7 44.3 49.6 6.4 9 52.3 45.0 51.4 7.4 10 55.0 46.4 54.4 8.6
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 and 26: Filtering for Valid Data - Listen f
Page 27: Binning and Averaging After binning
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

Create successful ePaper yourself

Delete template?

Save as template?