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Copyright of Menotyra is the property of Lithuanian Academy of Sciences Publishers and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The variation of the regularities of the statistical parameters of wind turbine noise emission is described in the article. The Fast Fourier Transform algorithm was used for establishment of the wind turbine noise emission spectrum. A considerable difference of the wind turbine noise emission spectrum was established in the range of frequencies from 200 to 3 150 Hz. In the spectrum of infrasound, low frequencies (from 16 to 200 Hz) and ultrasound there are found only small changes of the noise components. The wind turbine noise emission has a broadband range and its level increases as wind velocity increases. The level of the noise decreases when the distance from wind turbines increases. The analysis of the literature shows that the wind turbine noise emission depends on aerodynamic processes and the level of the mechanical noise emission. The background noise could be evaluated when the level of the wind turbine noise emission is calculated. The investigation shows that the level of background noise, when wind velocity achieves 12 m/s, becomes equal to wind turbine noise at the distance 100 meters from the wind turbine. The theoretical model for evaluation of wind turbine noise emission depending on the distance was proposed. [ABSTRACT FROM AUTHOR]

Copyright of Ekologija is the property of Lithuanian Academy of Sciences Publishers and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)