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Expected mean value of noise levels
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Basically, this would be a weighted logarithmic mean. The weigths would be the wind frequencies.
This requires sound levels at different wind speeds, which most larger manufacturers can supply.
If you aren't familiar with this kind of calculations, I could upload an excel spreadsheet that does the calculation. It's a quite simple model.
This requires sound levels at different wind speeds, which most larger manufacturers can supply.
If you aren't familiar with this kind of calculations, I could upload an excel spreadsheet that does the calculation. It's a quite simple model.
I don't think so. However, there is just one way to do it, so it's not that hard.
10*log(v1*10^(L1/10)+v2*10^(L2/10)+ ... )
Where v1, v2 ... are wind frequencies at different speeds, and L1, L2 ... are the corresponding sound levels.
Important to notice is that the wind distribution is at 10m. It can easily be converted to hub height according to the formulas found in IEC 614000-11. (I think it's 11.. anyway, the chapter about sound measurements)
10*log(v1*10^(L1/10)+v2*10^(L2/10)+ ... )
Where v1, v2 ... are wind frequencies at different speeds, and L1, L2 ... are the corresponding sound levels.
Important to notice is that the wind distribution is at 10m. It can easily be converted to hub height according to the formulas found in IEC 614000-11. (I think it's 11.. anyway, the chapter about sound measurements)
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