IEC Acoustic Standard IEC 61400-11

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Sound Power Level Calculate the sound power level for each bin using the sound pressure levels, slant distance (distance from rotor center to microphone), and reference area (S o = 1 m 2 ) SPL � SPL = 82.8 dB A spl corr = 46.9 dB A slant distance, R = 35.1 m S o = 1 m 2 spl corr NATIONAL RENEWABLE ENERGY LABORATORY � 6 � 10lg � � � � 2 4� R S0 � � � � WS bin CORR spl Diff SPL 6 46.9 6.6 82.8 7 45.4 3.8 * 8 49.6 6.4 85.4 9 51.4 7.4 87.3 10 54.4 8.6 90.2
NATIONAL RENEWABLE ENERGY LABORATORY Questions? Before we move onto one-third octaves 31
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 and 28: Binning and Averaging After binning
Page 29: Background Correction Calculate the
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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