The level of WT generated noise at rotor axis when wind speed is 12 m/s and is equal to Lw≈104 dB(A). When wind speed diminishes, the levels generated by WT and wind background noise reduces as well. WT noise at axis level at wind speed v=6 m/s if compared to wind speed v=12 m/s reduced from 104 dB(A) to 96 dB(A) [10], [21], 22, [23], 24 and 25, whereas wind generated background noise reduced to 36 dB(A). In most EU countries as well as in Lithuania, the allowable maximum noise level is 45 dB(A) 26 and 27.
Submitted experimental and theoretical calculation data (Fig. 4) reveal that at 6 m/s wind velocity, the background noise level is significantly lower than WT generated noise. Also, WT generated noise intensity level is significantly influenced by topographic and meteorological environment conditions [6].