Wind turbine noise is a complex issue that requires due diligence to minimize any potential impact on quality of life. This study enhances existing knowledge of wind turbine noise through focused analyses of downwind sound propagation, directionality, and the low frequency component of the noise. Measurements were conducted at four wind speeds according to a design of experiments at incremental distances and angles. Wind turbine noise is shown to be highly directional, while downwind sound propagation is spherical with limited ground absorption. The noise is found to have a significant low frequency component that is largely independent of wind speed over the 20-250 Hz range. The generated low frequency noise is shown to be audible above 40 Hz at the MOE setback distance of 550 m. Infrasound levels exhibit higher dependency on wind speed, but remain below audible levels up to 15 m/s.
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机译：风力涡轮机噪声是一个复杂的问题，需要进行尽职调查以最大程度地降低对生活质量的任何潜在影响。这项研究通过对顺风声音传播，方向性和噪音的低频成分进行了重点分析，增强了对风力涡轮机噪音的现有知识。根据实验设计，在四个风速下以递增的距离和角度进行测量。风力涡轮机的噪声被证明是高度定向的，而顺风的声音传播是球形的，对地面的吸收有限。发现噪声具有明显的低频成分，在很大程度上与20-250 Hz范围内的风速无关。在550 m的MOE后退距离处，所产生的低频噪声在40 Hz以上可以听到。次声水平显示出对风速的更高依赖性，但仍低于15 m / s的可听见水平。
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