Ha. braino† on the kHz, will edit that. The paper does cover the use of the Fletcher-Munson data insofar as they refer to the use of single tones to create the A-weighting. Have you given it a look?A-weighting involves first order high-pass filters at 107Hz and 737Hz, so it’s definitely on a 12dB/octave slope down in the infrasonics.
The law, BS4142 for industrial noise here, requires A-weighting measurements, which is perfect for anyone who likes to make low frequency noise! (Night clubs, for example, though repetative low frequency noise is just starting to get included)
However, A-weighting does correspond to the Fletcher-Munson curves at the sort of sound level one would expect for a wind turbine in the medium distance
47Hz is a bit of a puzzle,.
By the way some of your measurements seem to have sneaked in to the medium wave radio band!
Are you saying a certain ex president was on to something? The claim that wind farm noise can cause cancer?It has cites to sources for potential heath effects,
I don't see air, so it can't be there. Right? Generally speaking I don't see pollution either, but I feel its effects."I don't hear anything" as proof of harmlessness.
Wind farm nearby? Say a few thousand kilometers?There is no other continuous emitter than I can figure out.
Perish the thought! Got me wondering now too. Although I could hear the noise he made when he described the noise and used a circling hand gesture to indicate it.Are you saying a certain ex president was on to something? The claim that wind farm noise can cause cancer?
Please stop non-name dropping here. It's not clever, wanted and adds nothing informational to this thread.Are you saying a certain ex president was on to something? The claim that wind farm noise can cause cancer?
You can't beat Google for a straw poll. If you search for "cooling fan 2800rpm" you get quite a lot of hits, so my guess is that you have at least one fan with an electronically commutated synchronous (aka "brushless DC") motor that is spinning at 2800 rpm.Any ideas of the source? The next peak up in frequency is at 120Hz, so even if I don't have an exact source for that one, 60Hz power provides a reasonable cause in some way. But 47Hz ±1Hz is not something I can account for.
I thought it was a clever, well crafted post that is applicable to this thread.Please stop non-name dropping here. It's not clever, wanted and adds nothing informational to this thread.
You mean to say,"I don't like when you bring up the things he said or did"? I can't mention a name but it is history, sorry to hurt your feelings. But it does seem like he was on to something, or is that on something?Please stop non-name dropping here. It's not clever, wanted and adds nothing informational to this thread.
A clever, well crafted post would say the real reason for that idiotic 'cancer' statement was about the wallet :I thought it was a clever, well crafted post that is applicable to this thread.
https://consumerist.com/2010/08/01/...000-to-not-complain-about-wind-turbine-noise/The McCunney review found evidence that residents who receive compensation for living near wind turbines are less likely to report adverse health e ects than those who live nearby but do not receive economic benefit.
https://www.google.com/maps/place/C...e30e3e7a2c69b!8m2!3d45.6635021!4d-120.1090438Think fast: if a utility offered you $5,000 not to complain about the noise from their wind turbines, would you accept? What if the noise was so loud that it caused headaches and nausea? It’s a choice Caithness Energy is asking some Oregon residents to make as the utility tries to build one of the largest wind farms in the country.