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Infrasound and low-frequency noise: Difference between revisions

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Infrasound and low-frequency noise (view source)

Revision as of 19:50, 9 October 2019

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ILFN travels much farther with less dissipation than higher-frequency sound. It can go around barriers and penetrate – even resonate with – walls.
ILFN travels much farther with less dissipation than higher-frequency sound. It can go around barriers and penetrate – even resonate with – walls.


Most existing noise regulations use [[Decibel|A-weighted noise measurement]], which emphasizes the range of human conscious hearing. Thus they fail to take ILFN into account. (They usually also fail to consider [[amplitude modulation]] [AM], another characteristic that makes wind turbine noise more [[Annoyance|annoying]] and which itself, according to Australian acoustician Steven Cooper[https://www.wind-watch.org/documents/simplified-method-for-determination-of-amplitude-modulation-of-audible-and-inaudible-wind-turbine-noise/], may be “felt” like infrasound as it modulates at infrasonic frequencies.)
Most existing noise regulations use [[Decibel|A-weighted noise measurement]], which emphasizes the range of human conscious hearing. Thus they fail to take ILFN into account. (They usually also fail to consider [[amplitude modulation]], another characteristic that makes wind turbine noise more [[Annoyance|annoying]] and which itself, according to Australian acoustician Steven Cooper[https://www.wind-watch.org/documents/simplified-method-for-determination-of-amplitude-modulation-of-audible-and-inaudible-wind-turbine-noise/], may be “felt” like infrasound as it modulates at infrasonic frequencies.)


In 2011, Denmark imposed a 20 dBA limit for low-frequency (10–160 Hz) noise inside homes.[http://docs.wind-watch.org/DK-statute-wind-turbine-noise.pdf] A few localities have imposed limits defined by C-weighted measurements in addition to A-weighted, e.g., 50 dBC at the property line.[http://wndfo.net/ords]
In 2011, Denmark imposed a 20 dBA limit for low-frequency (10–160 Hz) noise inside homes.[http://docs.wind-watch.org/DK-statute-wind-turbine-noise.pdf] A few localities have imposed limits defined by C-weighted measurements in addition to A-weighted, e.g., 50 dBC at the property line.[http://wndfo.net/ords]


'''''See also:''''' [[Health Effects of Noise from Large Wind Turbines]].
'''''See also:''''' [[Health Effects of Noise from Large Wind Turbines]].
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