Analysis of Low-Frequency Noise from Wind Turbines using a Temporal Noise Code
* Presenting author
The growing demand for clean energy has led to the installation of large wind farms worldwide. This is often met by criticisms from nearby communities due to noise annoyance issues. Even at large distances, wind farms may occasionally be heard due to specific atmospheric conditions. Low-frequency noise has been mentioned as a possible source of annoyance for neighbors.The aim of this work is to use an existing aeroelastic code commonly used for wind turbine design. The atmospheric inflow turbulence is carefully modeled in the time domain and the loading on the blade can be used as an input for low-frequency noise generation.It is found that, in certain conditions, the previous mechanism (blade-turbulence interaction noise) can dominate the ambient low-frequency noise when confronting the model results with actual field measurements. Furthermore, a study of the characteristics of low-frequency noise is conducted. A series of parametric sensitivity analyses are conducted to identify the main parameters driving low-frequency noise levels, at least those that do have an influence on the proposed model.