Document Type : Original Article


Department of Mechanical Engineering, Arak University of Technology, Daneshgah Street, Arak, Iran.


Noise pollution is known as the biggest environmental problem of horizontal axis wind turbines. The main part of the noise is in the range of Low Frequency Noise (LFN) since wind turbines rotate slowly. Several studies show that the LFN could have adverse effects on human health. In this study, the LFN generated by NREL VI wind turbine in wind speeds of 13 m/s is calculated by using a hybrid approach. In this approach, noise sources are defined on a data surface (DS), and then the noise propagating form the DS is calculated. The results show that a DS obtained by scaling the blade span with a size factor of 5 is appropriate for surrounding all main sources in this problem. It means, in addition to sources located on blade surface, a significant part of steady sources generating LFN is far from blades. On the other hand, the results show that tip vortices have no significant effect on the LFN.


[1] REN21. (2021). Renewables 2020 Global Status Report. Paris, REN21 Secretariat.
[2] Shepherd, D., McBride, D., Welch, D., Dirks, K. N., and Hill, E. M. (2011). Evaluating the impact of wind turbine noise on health-related quality of life. Noise and Health, Vol. 13, No. 54, pp. 333.
[3] Nissenbaum, M.A., Aramini, J. J., and Hanning, C.D. (2012). Effects of industrial wind turbine noise on sleep and health. Noise and Health, Vol. 14, No 60, pp. 237.
[4] Bakker, R.H., Pedersen, E., van den Berg, G.P., Stewart, R.E., Lok, W., and Bouma, J. (2012). Impact of wind turbine sound on annoyance, self-reported sleep disturbance and psychological distress. Science of the Total Environment, Vol. 425, pp. 42-51.
[5] Van Renterghem, T., Bockstael, A., De Weirt, V., and Botteldooren, D. (2013). Annoyance, detection and recognition of wind turbine noise. Science of the Total Environment, Vol. 456, pp. 333-345.
[6] Inagaki, T., Li, Y., and Nishi, Y. (2015). Analysis of aerodynamic sound noise generated by a large-scaled wind turbine and its physiological evaluation. International Journal of Environmental Science and Technology, Vol 12, No. 6, pp.1933-1944.
[7] Swinbanks, M. (2015). Direct experience of low frequency noise and infrasound within a windfarm community. 6th International Meeting on Wind Turbine Noise, Glasgow, USA.
[8] Luo, K., Zhang, S., Gao, Z., Wang, J., Zhang, L., Yuan, R., Fan, J., and Cen, K. (2015). Large-eddy simulation and wind-tunnel measurement of aerodynamics and aeroacoustics of a horizontal-axis wind turbine. Renewable Energy, Vol. 77, pp. 351-362.
[9] Maizi, M., Mohamed, M.H., Dizene, R., and Mihoubi, M. C. (2018). Noise reduction of a horizontal wind turbine using different blade shapes. Renewable Energy, Vol. 117, pp. 242-256.
[10] Zhang, Sanxia, Kun Luo, Renyu Yuan, Qiang Wang, Jianwen Wang, Liru Zhang, and Jianren Fan. (2018). Influences of operating parameters on the aerodynamics and aeroacoustics of a horizontal-axis wind turbine. Energy, Vol. 160, pp. 597-611.
[11] Williams, J.F. and Hawkings, D.L. (1969). Sound generation by turbulence and surfaces in arbitrary motion. Philosophical Transactions for the Royal Society of London. Series A, Mathematical and Physical Sciences, pp. 321-342.
[12] Bozorgi, A., Ghorbaniasl, G., and Nourbakhsh, S.A. (2019). The reduction in low-frequency noise of horizontal-axis wind turbines by adjusting blade cone angle. International Journal of Environmental Science and Technology, Vol 16, No. 6, pp. 2573-2586.
[13] Hand, M.M., Simms, D.A., Fingersh, L.J., Jager, D.W., Cotrell, J.R., Schreck, S., and Larwood, S.M. (2001). Unsteady aerodynamics experiment phase VI: wind tunnel test configurations and available data campaigns (No. NREL/TP-500-29955). National Renewable Energy Lab., Golden, CO.(US).
[14] Wagner, S., Bareiss, R., and Guidati, G. (1996). Wind Turbine Noise. New York, Springer.
[15] Bozorgi, A. and Ghorbaniasl, G. (2020). Determination of significant sources generating low-frequency noise in horizontal axis wind turbines. Energy Equipment and Systems, Vol. 8, No. 3, pp. 253-262.
[16] Ghorbaniasl, G. and Lacor, C. (2012). A moving medium formulation for prediction of propeller noise at incidence. Journal of Sound and Vibration,  Vol. 331, No. 1, pp. 117-137.