Интересный коммент оттуда же:

Down stream turbulence puts very high impact type stresses on the machines in the wind shadow. On water, (sailing) the wind shadow is 300 times the height of the disturbance. This is not unlike trailing vortexes from landing aircraft. Also, wind speed is less at the ground than at the top of the blade pass. This results in more oscillating input.

I designed many dynamometer test and break in facilities for the gear boxes used to speed up the input from the primary shaft. The gear box is the Achilles Heal of these things. They are under designed with low service factors like aircraft but are not maintained with the same vigor. They are designed to be cheap. The typical design has the main shaft (16 to 30 inches diameter) supported on a large, self aligning, radial/thrust bearing. The extension of this shaft has the low speed input to the gearbox rigidly mounted on it so the gear box is shaft mounted. The large bearings of the low speed input and the case of the gearbox then take all of the side loads resulting from the turbine blades. Two large pins in the extreme extent on opposite sides of the case are mounted in rubber lined bases. They react the torque and side loads. Speed up ratio increases the typical 14 to 20 rpm turbine to synchronous speed for the generator. Typical gear boxes have a planetary low speed input followed by two stages of helical gear speed up.

Mean time to failure of the gear box varies with maintenance. A few years ago, this was 6 to 18 months. I doubt it has improved much. Rebuild costs are in the hundreds of thousands each. A projected 30 years life is disengenuously stupid and known to be false. One needs to understand the money metrics. Legislation typically requires an installed base of some percentage renewables. Bargain basement low bid turbines are the lowest per rated output. The rules typically do not require that the devices are working to claim credits. The amortized cost is assessed to the rate payers bills even if the turbines are broken. The power sellers make more money when the things are broken. There have been massive subsidies in cash and tax rebates as well.


Gear box damage can be failed bearings, broken teeth all the way to the housing broken to pieces. Some is rebuildable and some is scrap iron. The rebuild is new gears, bearings. Careful assembly with progressive load testing, oil analysis, cooler testing, vibration analysis. Final run in to burnish the gear teeth. Open port inspections. No guarantees. Some facilities are well run. Some are good ole’ boys with wrenches. All rely on subsidies and tax discounts. None of these facilities are built before the various support funding is lined up.

короче не осилил ты эту статью. ну ладно, бывает.

https://wattsupwiththat.com/2014/08/26/bearings-the-achill...

https://onyxinsight.com/wind-turbine-failures-encyclopedia/bearing-failures/brinelling/

Завтра сделаю пересчёт убыточности ветряков с учётом ускоренного износа...

http://gegenwind-weinheim.de/wordpress/tatsachliche-leistu...

FAZIT: Die durchschnittlich tatsächlich ins Stromnetz eingespeiste Leistung des letzten Jahres (Juli 2012 – Juni 2013) aus Windkraftanlagen entsprach deutschlandweit 15% der installierten Leistung. In Baden-Württemberg waren es nur 5%.

Diesem Nutzen müssen die Kosten finanzieller Art (im Umwelt-Bericht für die Stadt wird von 5,2 Millionen € je Windrad gesprochen ), der Einschnitte in den Naturpark und die Tierwelt, die Auswirkungen auf den Denkmal- und Landschaftsschutz und zu guter Letzt (leider kommen diese Belange tatsächlich immer zuletzt) die Lebensqualität der Einwohner vor Ort gegengerechnet werden.

Доказательная медицина, COVID-19, ЗОЖ