None of these geniuses have figured out that the real problem is that when there are MULTIPLE wind mills running at similar frequencies and slightly different phases, an interference pattern is established by the multiple sound wave fields colliding with each other, resulting in a standing wave pattern in which several areas will have the low frequency sounds tremendously amplified. Standing at such a location one could be bombarded by a tremendous sound wave, whereas a few yards away could be dead silence.
That makes sense, and it explains why not every one experiences this.
I’ve heard old timers talk about this effect when riding prop driven transport aircraft. When the pilots were trying to sync the props. They would hear the engines then for a few moments they would be perfectly synced and it would be deathly quiet.
You be talking about what is known as “beat frequencies”. Harmonics, products of two or more tones.