IEC Acoustic Standard IEC 61400-11
IEC Acoustic Standard IEC 61400-11
IEC Acoustic Standard IEC 61400-11
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Determination of Tone Level<br />
The sound pressure level of the tone L pt, is determined<br />
by energy summing all spectral lines classified as ‘tone’<br />
spl<br />
sum<br />
� 10 * log<br />
If there are more than 2 lines then a correction must be<br />
applied for using the Hanning window. Divide the<br />
energy sum by 1.5.<br />
L pt = 51.88 dB A<br />
n<br />
10 �<br />
i�1<br />
NATIONAL RENEWABLE ENERGY LABORATORY<br />
10<br />
0.<br />
1*<br />
spl<br />
i<br />
Freq (Hz) spl (dB A) Classification 10^0.1*spl<br />
198 25.30 0.0<br />
201 25.50 0.0<br />
204 26.02 0.0<br />
207 29.15 0.0<br />
210 32.15 0.0<br />
213 37.62 tone 5781.6<br />
216 39.88 tone 9733.2<br />
219 39.75 tone 9447.3<br />
222 39.86 tone 9678.8<br />
225 41.20 tone 13176.0<br />
228 40.31 tone 10750.3<br />
231 42.48 tone 17696.5<br />
234 43.87 tone 24360.8<br />
237 42.31 tone 17038.8<br />
240 43.43 tone 22031.6<br />
243 43.21 tone 20962.0<br />
246 43.50 tone 22364.2<br />
249 45.44 tone 34958.8<br />
252 41.22 tone 13247.8<br />
255 35.09 0.0<br />
258 30.45 0.0<br />
261 29.38 0.0<br />
264 30.78 0.0<br />
267 27.78 0.0<br />
270 26.37 0.0<br />
273 26.79 0.0<br />
276 27.61 0.0<br />
279 28.68 0.0<br />
282 27.74 0.0<br />
285 27.67 0.0<br />
288 27.38 0.0<br />
291 27.10 0.0<br />
294 27.68 0.0<br />
297 27.91 0.0<br />
300 27.46 0.0<br />
sum/1.5 154151.80<br />
Lpt 51.88
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