Re: Vibration resonance?

dpb wrote:
terry wrote:
...

One of the objections to wind farms has apparently been noise?

To date I have, mentally pooh-pooed the idea that a gentle 'whooshing'
noise could be objectionable!

But maybe one will have to build to reduce the 'Wind noise'. This
house btw, being low to the ground, ain't too bad even in 66 mph
winter storm gusts.

Maybe not wrong? Maybe there are noise concerns? While not objecting
at all to 'alternative energy' in all it's forms, from photo voltaic,
heat pumps and wind energy, just curious.

...

Some early demonstration facilities were quite noisy and bothersome -- the one near Boone, NC, was particularly notable in that regard early on. It had both an audible "whoosh" at 3X the rotor as each blade passed the support tower plus a sub-audible reverberation that was felt rather than heard. Owing to it's location, both echoed in the surrounding mountain area if wind conditions were right (which was frequent). I don't know status of that project any longer -- at one time it was closed owing to the complaints; whether modifications were made and it was ever operated any significant amount I've not investigated.

The larger current towers in the area (typical would be Gray County http://www.kansastravel.org/graycountywindfarm.htm) are not particularly noticeable for noise but they're built in the open. Standing at the base of the tower nearest the kiosk, I've not felt any ground vibration or the sub-audible shock wave mentioned about the NC demo facility. It was on a much lower tower, however.

The biggest complaint I have w/ wind is the fickle nature of the power source (even in W KS, notorious for being windy, the highest monthly capacity factor attained in the seven years of operation has been barely over 50% and there are months in midwinter and late summer the seven-year monthly average has only been in the low-20% range) and although they're not terribly ugly, it would be nice if we didn't have stuff just built all over everywhere. The output of this facility is only 112 MWe at 100% capacity and its spread out over 12,000 A (roughly a 20-sq mile area) and can be seen from nearly 20 miles away. That capacity is only a tenth of the output of a single large scale generating station that would have a land footprint of perhaps 1/4-sq mile and be visible from only a few miles at most even on the flat KS prairie. Plus, it would have an average availability of something like 80% or so on demand.

Wind, solar, geothermal, tides, etc., have a place but they're not the panacea many wish for.

--
The most annoying are those which locate the blade down wind of the support. Instead of allowing the blade to see a fairly uniform wind "field" the pole creates a wind free zone and the resulting noise is quite audible. Most of the newer systems have corrected this.

.

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